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Doping effects of manganese on the catalytic performance and structure of NiMgO catalysts for controllabe synthesis of multi-walled carbon nanotubes 认领 引用 被引量：4
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作者 Maofei Ran Wei Chu +3 位作者 Yan Liu Dong Liu Chang Zhang Jiae Zheng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2014年第6期781-788,共8页
Doping effects of manganese （Mn） on catalytic performance and structure evolution of NiMgO catalysts for synthesis of multi-walled carbon nanotubes （MWCNTs） from methane were investigated for the first time. Addit... Doping effects of manganese （Mn） on catalytic performance and structure evolution of NiMgO catalysts for synthesis of multi-walled carbon nanotubes （MWCNTs） from methane were investigated for the first time. Addition of Mn in NiMgO catalyst can greatly improve the MWCNTs yield. Mno.2NiMgO catalyst among the tested ones gives the highest MWCNTs yield as 2244%, which is two times higher than that of the catalyst without Mn. The structure evolution, reduction behaviors and surface chemical properties of MnNiMgO catalysts with various Mn contents were studied in detail. It was found that the stable solid solution of NiMgO2 formed in NiMgO catalyst was disturbed by the addition of Mn. Instead, another solid solution of MnMg608 is formed. More amount of Ni can be reduced and dispersed on the catalyst surface to be acted as active sites. Importantly, the changes of Ni content on the surface are correlated with the Ni particle size and the outer diameter of MWCNTs, suggesting the controllable synthesis of MWCNTs over MnNiMgO catalysts. 展开更多
关键词 doping effect manganese NiMgO catalyst controllable synthesis carbon nanotubes
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Doping effects on the electro-degradation of phenol on doped titanium suboxide anodes 认领 引用 被引量：1
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作者 Xuan Yang Jiuji Guo +2 位作者 Zhaowu Zhu Hui Zhang Tao Qi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第4期830-837,共8页
Titanium suboxide is an excellent electrode material for many oxidization reactions.In this article,the electrodes of pure Ti_4O_7,doped Ti_4O_7and the mixed-crystal of Ti_4O_7and Ti_5O_9were prepared to evaluate thei... Titanium suboxide is an excellent electrode material for many oxidization reactions.In this article,the electrodes of pure Ti_4O_7,doped Ti_4O_7and the mixed-crystal of Ti_4O_7and Ti_5O_9were prepared to evaluate their activities and doping effects in the electro-degradation of phenol.It was revealed by the HPLC analysis results that the degradation intermediates and routes were significantly affected by the doping element.On the pure Ti_4O_7anode,a series of classic intermediates were obtained from benzoquinone and hydroquinone to various carboxylic acids.These intermediates were degraded gradually to the final organic intermediate of oxalate in all experiments.At last,oxalate was oxidized to CO_2and H_2O.Distinctively,the Y-doped Ti_4O_7 anode directly broke phenol toα-ketoglutaric acid without the intermediates of benzoquinone and hydroquinone.The strong oxidization ability of the Y-doped Ti_4O_7 anode might be responsible for the highest COD removal ratio.In contrast,the Ga-doped Ti_4O_7 anode showed the worst degradation activity in this article.Three intermediates of benzoquinone,hydroquinone and maleic acid were found during the degradation.Benefiting from the weak ability,oxalate was efficiently accumulated with a very high yield of 74.6%.The results demonstrated promising applications from electrochemical preparation to wastewater degradation by adjusting the doping reagent of Ti_4O_7 electrodes. 展开更多
关键词 Titanium suboxide Electro-oxidation Doping effect Phenol Oxalate
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Rare Earth Doping Effects on Properties of Ceria-Zirconia Solid Solution 认领 引用 被引量：5
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作者 胡玉才 殷平 +2 位作者 梁涛 姜玮 刘冰 《Journal of Rare Earths》 SCIE EI CAS 2006年第Z2期86-89,共4页
Ce0.6Zr0.3RE0.1O2(RE = Y, La, Pr, Tb)solid solutions were prepared by co-precipitation technique and characterized by a series of methods. XRD and FT-Raman results show that Ce0.6Zr0.3RE0.1O2 has cubic fluorite struct... Ce0.6Zr0.3RE0.1O2(RE = Y, La, Pr, Tb)solid solutions were prepared by co-precipitation technique and characterized by a series of methods. XRD and FT-Raman results show that Ce0.6Zr0.3RE0.1O2 has cubic fluorite structure. The different dopant ion radii bring different effect on the cell parameter of Ce0.6Zr0.3RE0 1O2. The X-ray photoelectron spec-troscopy (XPS) results show that the binding energy of Ce3d, Zr3d and O1s for Ce0.6Zr0.3RE0.1O2 rises compared with that for Ce0.6Zr0.4O2, indicating that dopant elements change chemistry environment of solid solutions which is available to improve redox performance. Compared with Pd/Ce0.6Zr0.4O2, doping Y and La does not change air/fuel (A/F) characteristic of TWCs, but doping Pr and Tb widens A/F operating window and makes HC, CO and NO have higher conversion. The light-off temperature of Pd/Ce0.6Zr0.3La0.1O2 is corresponding to that of Pd/Ce0.6Zr0.4O2. However, the light-off temperatures of Pd/Ce0.6Zr0.3M0.1O2(M = Y, Pr, Tb) are lower than that of Pd/Ce0.6Zr0.4O2, which keep much lower after high temperature treatments. Among Pd/Ce0.6Zr0.3RE0.1 O2, Pd/Ce0.6Zr0.3Tb0.1 O2 represents wider A/F operating window, higher conversion, lower light-off temperature and better high-temperature resistance. 展开更多
关键词 doping effects ceria-zirconia solid solution rare earths
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Dual‐Metal Co‐Doping Strategy Enhances the Hydrogen Dissociation and Hydrogen Release Performance of LiBH4Assisted by Ensemble Learning 认领 引用
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作者 Zishan Luo Xi Sun +9 位作者 Hang Zhang Yuhang Zhou Wenhao Yan Tao Zhang Jiawei Li Hong Cui Weizhi Tian Rong Feng Lingxia Jin Hongkuan Yuan 《Rare Metals》 SCIE EI CAS CSCD 2026年第6期625-639,共15页
LiBH4has drawn significant attention due to its high theoretical hydrogen storage capacity of 18.5 wt%,yet its practical application is hindered by the harsh dehydrogenation conditions.This paper proposes a strateg... LiBH4has drawn significant attention due to its high theoretical hydrogen storage capacity of 18.5 wt%,yet its practical application is hindered by the harsh dehydrogenation conditions.This paper proposes a strategy integrating ensemble learning with density functional theory(EL-DFT)for rapidly screening modified LiBH4systems that exhibit both structural stability and low dehydrogenation temperatures within an acceptable capacity loss range.The results indicate that,in dual‐metal‐doped LiBH4structures(TM1TM2@LiBH4)at different doping sites,the synergistic interaction between the crystal structure and the local electronic environment collectively reduces the dissociation energy(Ed)of H in the BH4−group.Using the substitution energy(Esub)and dissociation energy(Ed)of 60 randomly selected TM1TM2@LiBH4structures as target values,a dual ensemble model AdaBoost.R2 was trained,yielding excellent predictive models:AdaBoost‐SVR(Esub)and AdaBoost‐GBR(Ed),with R2 values reaching 0.970 and 0.927,respectively.SHAP analysis reveals that structures with TM1 anchored at the S1 and S2 sites exhibit lower hydrogen dissociation energy.In particular,the ScSc(S1)@LiBH4structure shows Esub=−0.977 eV and Ed=0.549 eV.DFT calculations further demonstrate that dual Sc doping weakens the stability of B-H bonds,significantly lowering the dissociation energy barrier.AIMD simulations confirm that this structure initiates hydrogen release at 500 K.The EL-DFT strategy successfully identifies materials with mild dehydrogenation conditions and stable structures,providing theoretical guidance for further exploration of solid‐state hydrogen storage materials. 展开更多
关键词 co‐doping effect density functional theory ensemble learning hydrogen release performance modified LiBH4
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Doping effect of rare earth metal ions Sm3+,Nd3+and Ce4+on denitration performance of MnOx catalyst in low temperature NH3-SCR reaction 认领 引用 被引量：10
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作者 Jing Rong Wanxia Zhao +4 位作者 Wen Luo Keke Kang Lulu Long Yang Chen Xiaojiang Yao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2023年第9期1323-1335,I0002,共13页
The MnXOx catalysts(i.e.,MnSmOx,MnNdOx,MnCeOx) were prepared by reverse co-precipitation method and used for NH3-SCR reaction.It is found that MnCeOx catalyst presents the best low tempe rature catal... The MnXOx catalysts(i.e.,MnSmOx,MnNdOx,MnCeOx) were prepared by reverse co-precipitation method and used for NH3-SCR reaction.It is found that MnCeOx catalyst presents the best low tempe rature catalytic activity(higher than 90% NOx conversion in the te mperature range from 125 to 225℃)and excellent H2O+SO2 resistance.In order to explore the reason for this result,the characterization of X-ray diffraction(XRD),Raman spectroscopy,Brunauer-Emmett-Teller(BET),H2-temperature programmed reduction(H2-TPR),NH3-temperature programmed desorption(NH3-TPD),X-ray photoelectron spectroscopy(XPS) and in situ diffuse reflaxions infrared Fourier transformations spectroscopy(DRIFTS) were conducted.The obtained results suggest that MnCeOx catalyst shows the largest amount of acid sites and the best reducibility among these MnXOx catalysts.Besides,Ce4+ doping inhibits the crystallization of MnOx catalyst and shows the largest specific surface area.Finally,in situ DRIFTS experiments reveal that NH3-SCR reaction over MnCeOx catalyst follows both Langmuir-Hinshelwood(LH) and Eley-Rideal(E-R) mechanisms,which is through "fast SCR" reaction. 展开更多
关键词 Low temperature NH3-SCR reaction MnOxcatalyst Rare earth Doping effect
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Doping effect of cations(Zr4+,Al3+,and Si4+) on MnO_x/CeO_2 nano-rod catalyst for NH_3-SCR reaction at low temperature 认领 引用 被引量：7
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作者 Xiaojiang Yao Jun Cao +4 位作者 Li Chen Keke Kang Yang Chen Mi Tian Fumo Yang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第5期733-743,共11页
Thermally stable Zr4+, Al3+, and Si4+ cations were incorporated into the lattice of CeO2 nano‐rods (i.e., CeO2‐NR) in order to improve the specific surface area. The undoped and Zr4+, Al3+, and Si4+ doped nano‐rods... Thermally stable Zr4+, Al3+, and Si4+ cations were incorporated into the lattice of CeO2 nano‐rods (i.e., CeO2‐NR) in order to improve the specific surface area. The undoped and Zr4+, Al3+, and Si4+ doped nano‐rods were used as supports to prepare MnOx/CeO2‐NR, MnOx/CZ‐NR, MnOx/CA‐NR, and MnOx/CS‐NR catalysts, respectively. The prepared supports and catalysts were comprehensively characterized by transmission electron microscopy (TEM), high‐resolution TEM, X‐ray diffraction, Raman and N2‐physisorption analyses, hydrogen temperature‐programmed reduction, ammonia temperature‐programmed desorption, in situ diffuse reflectance infrared Fourier‐transform spectroscopic analysis of the NH3 adsorption, and X‐ray photoelectron spectroscopy. Moreover, the catalytic performance and H2O+SO2 tolerance of these samples were evaluated through NH3‐selective catalytic reduction (NH3‐SCR) in the absence or presence of H2O and SO2. The obtained results show that the MnOx/CS‐NR catalyst exhibits the highest NOx conversion and the lowest N2O concentration, which result from the largest number of oxygen vacancies and acid sites, the highest Mn4+ content, and the lowest redox ability. The MnOx/CS‐NR catalyst also presents excellent resistance to H2O and SO2. All of these phenomena suggest that Si4+ is the optimal dopant for the MnOx/CeO2‐NR catalyst. 展开更多
关键词 MnOx/CeO2 nano‐rod catalyst Doping effect Oxygen vacancy Surface acidity Low‐temperature NH3‐SCR reaction
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Doping Effect of Co at Ag Sites in Antiperovskite Mn3AgN Compounds 认领 引用 被引量：4
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作者 褚立华 王聪 +5 位作者 孙莹 李美成 万子裴 王宇 窦尚轶 楚月 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第4期126-129,共4页
Antiperovskite compounds Mn3Ag1-xCoxN （x =0.2, 0.5 and 0.8） are synthesized and the doping effect of the magnetic element Co at the Ag site is investigated. The crystal structure is not changed by the introduction o... Antiperovskite compounds Mn3Ag1-xCoxN （x =0.2, 0.5 and 0.8） are synthesized and the doping effect of the magnetic element Co at the Ag site is investigated. The crystal structure is not changed by the introduction of Co. However, with the increase of the content of Co, the spin reorientation gradually disappears and the antiferromagnetic transition changes to the ferromagnetic transition at the elevated temperature when x = 0.8. In addition, all of the magnetic phase transitions at the elevated temperature are always accompanied by the abnormal thermal expansion behaviors and an entropy change. Moreover, when x = 0.8, the coefficient of linear expansion is -1.89 × 10^-6 K^-1 （290-310K, △T =20 K）, which is generally considered as the low thermal expansion. 展开更多
关键词 Ag Co Doping Effect of Co at Ag Sites in Antiperovskite Mn3AgN Compounds Mn
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Doping of group IVB elements for nickel-rich cobalt-free cathodes 认领 引用 被引量：3
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作者 Shengnan Guo Xincheng Lei +9 位作者 Jiayi Wang Jie Su Yingying Wang Xiaozhi Liu Pengxiang Ji Kangning Zhao Xuefeng Wang Lin Gu Zhenpeng Yao Dong Su 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第11期559-568,I0012,共10页
Hetero-element doping is a promising strategy to improve the cycling stability of nickel-rich cobalt-free cathodes for the next-generation high energy-density Li ion batteries.To make doping effective,it is important ... Hetero-element doping is a promising strategy to improve the cycling stability of nickel-rich cobalt-free cathodes for the next-generation high energy-density Li ion batteries.To make doping effective,it is important to understand the mechanism of how the dopants regulate the electronic band,lattice parameter adjusting,or hetero-phase formation to achieve high stability.In this study,we investigate LiNi0.9Mn0.1O2cathodes doped with IVB grouping elements via multiple characterization techniques.By utilizing in situ XRD and TEM methods,we found that the stronger Ti-O bond effectively improves the cathode stability via a dual protection mechanism.Specifically,the bulk lattice of cathode is wellpreserved during cycling as a result of the suppressed H2-H3phase transition,while a in situ formed Ti-rich surface layer can prevent continuous surface degradation.As a result,the 5%Ti doped LiNi0.9Mn0.1O2cathode exhibits a high capacity retention of 96%after 100 cycles.Whereas,despite IVB group elements Zr and Hf have stronger bonding energy with oxygen,their larger ionic radii actually impede their diffusion into the cathode,thereby they can not improve the cycling stability.Our findings uncover the functional origin of doped elements with their dynamic modification on cathode structure,providing mechanistic insights into the design of nickel-rich cobalt-free cathodes. 展开更多
关键词 Li ion battery Layered cathode Cycling stability Doping effect In situXRD
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Doping Effect of CuO on CeO_2 for CO Oxidation 认领 引用 被引量：2
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作者 Ji Jun ZHANG Neng LI +1 位作者 Ying Jun LIU Bing Xiong LIN 《Chinese Chemical Letters》 SCIE CAS 1998年第9期873-876,共4页
Cu-Ce-O catalysts, prepared by the amorphous citrate precursor (ACP) method, wereinvestigated by ICP, XRD and ndcro-reactor techniques. At low copper content of Cu-Ce-Ocatalysts, fluorite structures formed at low calc... Cu-Ce-O catalysts, prepared by the amorphous citrate precursor (ACP) method, wereinvestigated by ICP, XRD and ndcro-reactor techniques. At low copper content of Cu-Ce-Ocatalysts, fluorite structures formed at low calcining temperatures, and Cuo doped into the CeO2matrix; at high copper content, in addition to the fluorite structure, crystalline monoclinic phaseCuO formed as well at high calcining temperatures. There was no other phase formed even calcinedat 1000℃. The results show that only a little CuO dopes into the CeO2 matrix to form complexoxide, which promotes the catalytic activity of CO oxidation greatly. The optimum Cu-Ce-Ocatalyst is composed of 15% copper by Cu/(Ce+Cu) atomic ratio, and calcined at 700℃ for 4h. Thephase compositions include the crystalline CuO and the active complex oxide with fluoritestructure. The formulation of the active complex oxide is Cu0.06Ce0. 94O1.94. 展开更多
关键词 ceria copper oxide fluorite-type structure, CO oxidation catalyst, doping effect
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Surface doping effect on the optoelectronic performance of 2D organic crystals based on cyano-substituted perylene diimides 认领 引用
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作者 Jaeyong Ahn Zhenping Li +6 位作者 Zhiwei Wang Ke Gao Huagui Zhuo Wanuk Choi Gang Chang Xiaobo Shang Joon Hak Oh 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第9期193-197,共5页
Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free nature.However,the developm... Compared to organic thin films,organic single crystals offer significant potential in organic phototransistors(OPTs)due to their enhanced charge transport,large surface area,and defect-free nature.However,the development of n-type semiconductors has lagged behind p-type semiconductors.To enhance semiconductor device performance,a doping process can be employed,which typically involves the introduction of charged impurities into the crystalline semiconducting material.Its aim is to reduce the Ohmic losses,increase carrier density,improve transport capabilities,and facilitate effective carrier injection,ultimately enhancing the electrical properties of the material.Traditional doping processes,however,often pose a risk of damaging the structure of single crystals.In this study,we have synthesized novel cyanosubstituted chiral perylene diimides,which self-assemble into two-dimensional single crystals that can be used for n-type semiconductor devices.We have employed a surface doping strategy using diethylamine vapor without disrupting the crystal structure.The fabricated devices exhibit significantly higher charge transport properties after doping,achieving a maximum electron mobility of 0.14 cm2V-1s-1,representing an improvement of over threefold.Furthermore,the optoelectronic performance of the doped devices has significantly improved,with the external quantum efficiency increased by over 9 times and the significantly improved response time.These results suggest that our surface doping technology is a promising way for enhancing the performance of 2D organic single-crystal OPTs. 展开更多
关键词 Doping effect Phototransistors Perylene diimides Organic crystals Cyano substitution
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Doping effect on the structure and physical properties of quasi-one-dimensional compounds Ba9Co3(Se1−xSx)15(x=0-0.2) 认领 引用
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作者 Lei Duan Xian-Cheng Wang +9 位作者 Jun Zhang Jian-Fa Zhao Wen-Min Li Li-Peng Cao Zhi-Wei Zhao Changjiang Xiao Ying Ren Shun Wang Jinlong Zhu Chang-Qing Jin 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期436-441,共6页
A series of samples of Ba9Co3(Se1−xSx)15(x=0,0.05,0.1,0.15,0.2)with quasi-one-dimensional(1D)structure were successfully synthesized under high-temperature and high-pressure conditions.The influence of ... A series of samples of Ba9Co3(Se1−xSx)15(x=0,0.05,0.1,0.15,0.2)with quasi-one-dimensional(1D)structure were successfully synthesized under high-temperature and high-pressure conditions.The influence of partial substitution of S for Se on the structure,electronic transport,and magnetic properties of Ba9Co3(Se1−xSx)15 has been investigated in detail.The x-ray diffraction data shows that the lattice constant decreases linearly with increasing S-doping level,which follows the Vegrad’s law.The doped S atoms preferentially occupy the site of Se atoms in CoSe6 octahedron.Physical properties measurements indicate that all the samples of Ba9Co3(Se1−xSx)15 are semiconducting and display spin glass behavior.As the replacement of Se by smaller size S,although the inter-chain distance decreases,the electronic hopping between CoSe/S6 chains is weakened and leads to an increase of band gap from 0.75 eV to 0.86 eV,since the S-3p electrons are more localized than Se-4p ones.Ba9Co3(Se1−xSx)15 exhibits 1D conducting chain characteristic. 展开更多
关键词 doping effect one-dimensional chain spin glass high-pressure synthesis
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Effect of Chemical Doping on the Electronic Transport Properties of Tailoring Graphene Nanoribbons 认领 引用 被引量：1
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作者 Yang Liu Cai-Juan Xia +3 位作者 Bo-Qun Zhang Ting-Ting Zhang Yan Cui Zhen-Yang Hu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2018年第6期62-65,共4页
The electronic transport properties of a molecular junction based on doping tailoring armchair-type graphene nanoribbons（AGNRs）with different widths are investigated by applying the non-equilibrium Green＇s function... The electronic transport properties of a molecular junction based on doping tailoring armchair-type graphene nanoribbons（AGNRs）with different widths are investigated by applying the non-equilibrium Green＇s function formalism combined with first-principles density functional theory.The calculated results show that the width and doping play significant roles in the electronic transport properties of the molecular junction.A higher current can be obtained for the molecular junctions with the tailoring AGNRs with W=11.Furthermore,the current of boron-doped tailoring AGNRs with widths W=7 is nearly four times larger than that of the undoped one,which can be potentially useful for the design of high performance electronic devices. 展开更多
关键词 Effect of Chemical Doping on the Electronic Transport Properties of Tailoring Graphene Nanoribbons
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Selective core-shell doping enabling high performance 4.6 V-LiCoO2 认领 引用
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作者 Yueming Xia Jianrui Feng +6 位作者 Jinhui Li Yan Li Zhengfeng Zhang Xiaoqi Wang Jianli Shao Manling Sui Pengfei Yan 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期684-693,I0015,共10页
Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO2(LCO).Herein,we manage to synthesize a surface Mg-doping and bulk Al-doping coreshell structured ... Constructing robust surface and bulk structure is the prerequisite for realizing high performance high voltage LiCoO2(LCO).Herein,we manage to synthesize a surface Mg-doping and bulk Al-doping coreshell structured LCO,which demonstrates excellent cycling performance.Half-cell shows 94.2%capacity retention after 100 cycles at 3.0-4.6 V(vs.Li/Li+)cycling,and no capacity decay after 300 cycles for fullcell test(3.0-4.55 V).Based on comprehensive microanalysis and theoretical calculations,the degradation mechanisms and doping effects are systematically revealed.For the undoped LCO,high voltage cycling induces severe interfacial and bulk degradations,where cracks,stripe defects,fatigue H2 phase,and spinel phase are identified in grain bulk.For the doped LCO,Mg-doped surface shell can suppress the interfacial degradations,which not only stabilizes the surface structure by forming a thin rock-salt layer but also significantly improves the electronic conductivity,thus enabling superior rate performance.Bulk Al-doping can suppress the lattice"breathing"effect and the detrimental H3 to H1-3 phase transition,which minimizes the internal strain and defects growth,maintaining the layered structure after prolonged cycling.Combining theoretical calculations,this work deepens our understanding of the doping effects of Mg and Al,which is valuable in guiding the future material design of high voltage LCO. 展开更多
关键词 Lithium-ion battery Doping effect Failure mechanism High-voltage LiCoO2 Electron microscopy
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Effect of Crystallinity of Fullerene Derivatives on Doping Density in the Organic Bulk Heterojunction Layer in Polymer Solar Cells 认领 引用
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作者 刘倩 何志群 +3 位作者 梁春军 赵勇 肖维康 李丹 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第5期103-106,共4页
Polymer solar cells （PSCs） based on poly（3-hexylthiophene） （P3HT） and [6,6]-phenyl-C61-butyric acid methyl ester （PCBM） are fabricated by using 1,8-diiodooctane （DIO） as a solvent additive to control the dop... Polymer solar cells （PSCs） based on poly（3-hexylthiophene） （P3HT） and [6,6]-phenyl-C61-butyric acid methyl ester （PCBM） are fabricated by using 1,8-diiodooctane （DIO） as a solvent additive to control the doping density of the PSCs. It is shown that the processing of DIO does not change the doping density of the P3HT phase, while it causes a dramatic reduction of the doping density of the PCBM phase, which decreases the doping density of the whole blend layer from 3.7 × 10^16 cm-3 to 1.2 ×10^16 cm-3. The reduction of the doping density in the PCBM phase originates from the increasing crystallinity of PCBM with DIO addition, and it leads to a decreasing doping density in the blend film and improves the short circuit current of the PSCs. 展开更多
关键词 HT Effect of Crystallinity of Fullerene Derivatives on Doping Density in the Organic Bulk Heterojunction Layer in Polymer Solar Cells DIO
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Unraveling the missed heteroatom-doping effect in pyrite FeS2 for oxygen evolution reaction 认领 引用
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作者 Luhong Fu Runze He +3 位作者 Shuli Wang Anantharaj Sengeni Weiwei Cai Ligang Feng 《Science China Materials》 SCIE EI CAS CSCD 2026年第7期4090-4097,共8页
Although significant progress has been made in doped catalyst development,the intrinsic role of dopants beyond the conventional understanding remains intriguing and unresolved.Herein,we reveal the missed heteroatom do... Although significant progress has been made in doped catalyst development,the intrinsic role of dopants beyond the conventional understanding remains intriguing and unresolved.Herein,we reveal the missed heteroatom doping effect,taking a graphene-supported Co-doped FeS2 catalyst for example,in the oxygen evolution reaction.Rather than the conventional electronic effect from the dopants,the comprehensive characterization and in situ Raman spectroscopy reveal that Co incorporation disrupts S–S bond symmetry and orbital matching within FeS2,generating S2-species that accelerate surface reconstruction into active FeOOH under electrochemical conditions.After reconstruction,Co atoms remain integrated within the FeOOH lattice,upshifting its d-band center and optimizing oxygen intermediate adsorption,as confirmed by theoretical calculations.This study reveals the dual functionality of Co dopants,facilitating rapid reconstruction in the pre-catalyst and modulating the electronic structure of the active phase,providing novel mechanistic insights into dopant-induced dynamic reconstruction for electrocatalysis. 展开更多
关键词 FeS2 graphene surface reconstruction oxygen evolution reaction doping effect
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Understanding the Doping Effect and Electrolyte Effect in Electrocatalytic Oxidation of Glycerol With Ligand-Protected Silver Nanoclusters Special Collection:Functional Metal Clusters 认领 引用
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作者 Dan Yang Mingxin Wang +7 位作者 Yiwen Zhao Zhaotong Yuan Mengjie Wu Chunmei Zhou Yihu Dai Xiaoyue Wan Yanhui Yang Yan Zhu 《Aggregate》 EI CAS CSCD 2026年第2期228-240,共13页
The efficient electrocatalytic oxidation of glycerol(GLY)is one of the most promising routes for the valorization of GLY.Doping has emerged as a powerful strategy to tailor the electrocatalytic performance of silver n... The efficient electrocatalytic oxidation of glycerol(GLY)is one of the most promising routes for the valorization of GLY.Doping has emerged as a powerful strategy to tailor the electrocatalytic performance of silver nanoclusters(Ag NCs),yet the effects of doping mode(surface vs.core)and the interface environment(e.g.,electrolyte concentration)on the electrocatalytic performance for Ag NCs toward GLY oxidation remain understood.In this work,surface-doped Ag4M2(SR)8 and core-doped Ag24M(SR)18(M=Ni,Pd,Pt;SR=SPhMe2)NCs were synthesized for electrocatalytic GLY oxidation.The results revealed a strong dependence of selectivity on doping mode and electrolyte concentration:under low KOH concentration,Pd-and Pt-doped Ag4M2 NCs exhibited 100%selectivity toward oxalic acid(OA),whereas Pd-and Pt-doped Ag24M NCs delivered>95%selectivity for formic acid(FA).In contrast,under high KOH concentration,Pd-and Pt-doped Ag4M2 NCs gave rise to>80%FA,while Pd-and Pt-doped Ag24M NCs produced>45%FA.Mechanism studies indicated that Ni doping predominantly enhanced catalytic activity via lowering the activation barrier of the initial reaction step(GLY→glyceraldehyde),whereas Pd and Pt doping modulated selectivity through reducing the energy barrier of the selective branch step(glyceric acid→OA,OA→FA).High KOH concentration promoted the oxidation by increasing the electrochemical active surface area and facilitating electron transfer of Ag NCs.This study provides clear guidance for designing high-performance Ag-based electrocatalysts for biomass valorization. 展开更多
关键词 atomically precise metal nanoclusters doping effect electrocatalytic oxidation of glycerol electrolyte effect silver nanocluster
Facet–doping coupling governs ferrocene monolayer redox on silicon surfaces 认领 引用
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作者 Xiaojie Zhong Xiaoxue Song +5 位作者 Weiqiang Zhou Qian Yang Shun Li Jianming Zhang Yuqiao Zhang Long Zhang 《Frontiers of Materials Science》 SCIE CAS CSCD 2026年第2期95-105,共11页
Semiconductor electrodes offer powerful routes to engineer electrochemical function,yet predicting surface confined charge transfer remains challenging because crystallography and doping reshape interfacial structure,... Semiconductor electrodes offer powerful routes to engineer electrochemical function,yet predicting surface confined charge transfer remains challenging because crystallography and doping reshape interfacial structure,band bending,and potential distribution.Here we map these coupled effects using ferrocene(Fc)monolayers grafted onto hydrogen-terminated p-and n-type Si(100),Si(110),and Si(111).Successful functionalization was confirmed by X-ray photoelectron spectroscopy and cyclic voltammetry.The Fc surface coverage(Γ)is strongly facet dependent and,in particular,doping reverses the facet selectivity:p-type follows(100)>(110)>(111),whereas n-type follows(111)>(110)>(100).In contrast,the Fc/Fc+mid-point potential shows a consistent orientation hierarchy for both dopings((100)>(110)>(111))with an additional~20–40 mV positive shift on n-type relative to p-type,indicating robust redox energetics with doping-controlled offsets.Peak widths exceed the ideal surface-confined limit and,together with impedance responses,point to non-ideal behavior dominated by interfacial electrostatics rather than ohmic artifacts.This facet-by-doping map clarifies how the silicon surface structure and electronic boundary conditions partition their influence across the monolayer formation and redox energetics,providing guidance for silicon-based molecular electrochemical interfaces in sensing and molecular electronics. 展开更多
关键词 semiconductor electrochemistry surface-confined redox ferrocene monolayer crystal orientation doping effect
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Non-metallic gold nanoclusters for oxygen activation and aerobic oxidation 认领 引用 被引量：6
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作者 Guomei Zhang Ruru Wang Gao Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第5期687-693,共7页
In recent decade, Au nanoclusters of atomic precision （AunLm, where L= organic ligand： thiolate andphosphine） have been shown as a new promising nanogold catalyst. The well-defined AunLm catalystspossess unique ele... In recent decade, Au nanoclusters of atomic precision （AunLm, where L= organic ligand： thiolate andphosphine） have been shown as a new promising nanogold catalyst. The well-defined AunLm catalystspossess unique electronic properties and frameworks, providing an excellent opportunity to correlate theintrinsic catalytic behavior with the cluster＇s framework as well as to study the catalytic mechanismsover gold nanoclusters. In this review, we only demonstrate the important roles of the gold nanoclustersin the oxygen activation （e.g., 302 to 102） and their selective oxidations in the presence of oxygen （e.g., COto C02, sulfides to sulfoxides, alcohol to aldehyde, styrene to styrene epoxide, amines to imines, andglucose to gluconic acid）. The size-specificity （Au25 （1.3 nm）, Au38 （].5 nm）, Au144 （1.9 nm）, etc.）, ligandengineering （e.g., aromatic vs aliphatic）, and doping effects （e.g., copper, silver, palladium, and platinum）are discussed in details. Finally, the proposed reactions＇ mechanism and the relationships of clusters＇structure and activity at the atomic level also are presented. 展开更多
关键词 Gold nanocluster Oxygen activation Aerobic oxidation Size-specificity Ligand engineering Doping effects
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Effect of Mn substitution on superconductivity in iron selenide (Li, Fe)OHFeSe single crystals 认领 引用
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作者 Yiyuan Mao Zian Li +12 位作者 Huaxue Zhou Mingwei Ma Ke Chai Shunli Ni Shaobo Liu Jinpeng Tian Yulong Huang Jie Yuan Kui Jin Xiaoli Dong Fang Zhou Jianqi Li ZhongxianZhao 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第7期492-496,共5页
We synthesize a series of Mn substituted （Li, Fe）OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z （the atomic ratio of Mn：Se） ranging from 0 to 0.07. The distr... We synthesize a series of Mn substituted （Li, Fe）OHFeSe superconductor single crystals via a modified ion-exchange method, with the Mn concentration z （the atomic ratio of Mn：Se） ranging from 0 to 0.07. The distribution homogeneity of the Mn element incorporated into the lattice of （Li, Fe）OHFeSe is checked by combined measurements of high-angle- annular-dark-field （HAADF） imaging and electron energy-loss spectroscopy （EELS）. Interestingly, we find that the superconducting transition temperature Tc and unit cell parameter c of the Mn-doped （Li, Fe）OHFeSe samples display similar V-shaped evolutions with the increasing dopant concentration z. We propose that, with increasing doping level, the Mn dopant first occupies the tetrahedral sites in the （Li, Fe）OH layers before starting to substitute the Fe element in the su- perconducting FeSe layers, which accounts for the V-shaped change in cell parameter c. The observed positive correlation between the Tc and lattice parameter c, regardless of the Mn doping level z, indicates that a larger interlayer separation, or a weaker interlayer coupling, is essential for the high-Tc superconductivity in （Li, Fe）OHFeSe. This agrees with our previous observations on powder, single crystal, and film samples of （Li, Fe）OHFeSe superconductors. 展开更多
关键词 FeSe-based superconductors Mn doping effect correlation between superconductivity and interlayer separation
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High-Temperature Performance Analysis of AlGaN/GaN Polarization Doped Field Effect Transistors Based on the Quasi-Multi-Channel Model 认领 引用
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作者 房玉龙 冯志红 +6 位作者 李成明 宋旭波 尹甲运 周幸叶 王元刚 吕元杰 蔡树军 《Chinese Physics Letters》 SCIE EI CAS CSCD 2015年第3期117-120,共4页
We report on the temperature-dependent dc performance of A1GaN/GaN polarization doped field effect transistors （PolFETs）. The rough decrements of drain current and transeonductance with the operation temperature are... We report on the temperature-dependent dc performance of A1GaN/GaN polarization doped field effect transistors （PolFETs）. The rough decrements of drain current and transeonductance with the operation temperature are observed. Compared with the conventional HFETs, the drain current drop of the PolFET is smaller. The transeonductance drop of PolFETs at different gate biases shows different temperature dependences. From the aspect of the unique carrier behaviors of graded AlGaN/GaN heterostructure, we propose a quasi-multi-channel model to investigate the physics behind the temperature-dependent performance of AlGaN/GaN PolFETs. 展开更多
关键词 AlGaN High-Temperature Performance Analysis of AlGaN/GaN Polarization Doped Field Effect Transistors Based on the Quasi-Multi-Channel Model
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