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Theoretical Study of Dehydrogenation Reaction Mechanism on Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2,or Cu1/Au8Cu2/TiO2Surfaces 认领 引用
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作者 Hongwei Li Ruimin Wang +2 位作者 Caifang Han Bo Ren Hongjun Fan 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期225-232,I0069-I0071,I0170,共8页
Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for ... Comprehensive analysis of the connection be-tween surface metal species and the mechanism of hydrogen(H2)generation on TiO2provides important new information for the develop-ment of more effective catalysts for H2 produc-tion.We have systematically investigated the mechanism of catalytic H2 generation on the Cu10/TiO2,Au10/TiO2,Au8Cu2/TiO2and Cu1/Au8Cu2/TiO2surfaces using density func-tional theory.Our results demonstrate an O-Hδ+···Hδ−-M type transition state for H2 production,and the Au8Cu2(0.54 eV)bimetal-lic cluster catalyst exhibits more activity in comparison to the Cu10(0.63 eV)and Au10(0.88 eV)cluster catalysts on the TiO2surface.On the Cu1/Au8Cu2/TiO2surface,we found that Au8Cu2clusters act as electron donors,while Cu single atom acts as an electron acceptor.Therefore,the Au8Cu2bimetallic catalyst has a low energy barrier(0.58 eV)in the reductive reaction of H2 production in water,but Cu single atom as the catalytic center has a higher en-ergy barrier(1.49 eV).This implies that bimetallic catalysts may be able to catalyze the wa-ter dehydrogenation reaction more successfully,which would be important knowledge for comprehending and refining the photocatalytic H2 generation process. 展开更多
关键词 TiO2surface Metal cluster Dehydrogenation Cu Au Bimetallic catalyst Den-sity functional theory
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Au/FeO_x-TiO_2 as an efficient catalyst for the selective hydrogenation of phthalic anhydride to phthalide 认领 引用 被引量：2
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作者 Ying Xin Liu Tie Feng Xing +2 位作者 Yi Ming Luo Xiao Nian Li Wei Yan 《Chinese Chemical Letters》 SCIE CAS 2010年第11期1322-1325,共4页
Au/FeOx-TiO2,prepared by deposition-precipitation method,is an efficient and stable catalyst for the liquid phase selective hydrogenation of phthalic anhydride to phthalide under mild reaction conditions.
关键词 Au/FeOx-TiO2 catalyst Phthalic anhydride Liquid phase hydrogenation Phthalide
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Investigation of water adsorption and dissociation on Au_1/CeO_2 single-atom catalysts using density functional theory 认领 引用 被引量：3
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作者 Yan Tang Yang‐Gang Wang +1 位作者 Jin‐Xia Liang Jun Li 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第9期1558-1565,共8页
We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to ... We examined the water adsorption and dissociation on ceria surfaces as well as ceria‐supported Au single‐atom catalysts using density functional theory calculations.Molecular and dissociative water were observed to coexist on clean CeO2and reduced Au1/CeO2?x surfaces because of the small difference in adsorption energies,whereas the presence of dissociative water was highly favorable on reduced CeO2?x and clean Au1/CeO2surfaces.Positively charged Au single atoms on the ceria surface not only provided activation sites for water adsorption but also facilitated water dissociation by weakening the intramolecular O-H bonds.In contrast,negatively charged Au single atoms were not reactive for water adsorption because of the saturation of Au5d and6s electron shells.This work provides a fundamental understanding of the interaction between water and single‐atom Au catalysts. 展开更多
关键词 Single‐atom catalyst Au single atom Ceria H2O dissociation
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Study on Au/Al_2O_3 catalysts for low-temperature CO oxidation in situ FT-IR 认领 引用
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作者 Xuhua Zou Shixue Qi +3 位作者 Jinguang Xu Zhanghuai Suo Lidun An Feng Li 《Journal of Natural Gas Chemistry》 2010年第3期307-312,共6页
Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were exa... Au/Al2O3 catalyst was prepared by a modified anion impregnation method and investigated with respect to its initial activity and stability for low-temperature CO oxidation.The activity changes of the catalyst were examined after separate treatment in CO＋O2 or CO2 ＋O2 .Furthermore,in situ FT-IR studies were performed to investigate the species on the surface when CO or CO＋O2 or CO2 ＋O2 was selected separately as adsorption gas.The results showed that Au/Al2O3 catalyst exhibited very high initial activity,but the catalytic activity was found to decrease gradually during CO oxidation with time on stream.And also,the activity of the catalyst declined after treatment in CO＋O2 or CO2 ＋O2 .The formation and accumulation of carbonate-like species during CO oxidation or treatment in CO＋O2 or CO2 ＋O2 might be mainly responsible for the activity decrease,which was reversible. 展开更多
关键词 supported gold catalyst Au/Al2O3 CO oxidation catalytic activity stability in situ FT-IR
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Surface pits stabilized Au catalyst for low-temperature CO oxidation 认领 引用 被引量：5
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作者 Ya-Feng Cai Chen Fei +7 位作者 Cheng Zhang Jie Yang Li Wang Wang-Cheng Zhan Yang-Long Guo Xiao-Ming Cao Xue-Qing Gong Yun Guo 《Rare Metals》 SCIE EI CAS CSCD 2022年第9期3060-3068,共9页
Development of active and stable catalysts for low-temperature CO oxidation has long been regarded as a hot topic.In this contribution,we used CeO2 with high-density surface pits as support to prepare an active and... Development of active and stable catalysts for low-temperature CO oxidation has long been regarded as a hot topic.In this contribution,we used CeO2 with high-density surface pits as support to prepare an active and stable Au/CeO2 catalyst by an adsorption-deposition method.The obtained 0.05 wt%Au/CeO2-TD(where TD represents thermal decomposition)can maintain its activity at 80℃ for more than 20 h or even after calcination at 800℃ for 2 h.The characterization results showed that the high-density surface pits on CeO2-TD play a decisive role in the stabilization of Au and enhancement of the redox property.This work may provide a new strategy to improve the stability of supported metal catalysts by a simple and conventional method. 展开更多
关键词 Au catalyst CeO2 Surface defect Stability CO oxidation
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Au/ZrO_2催化剂中ZrO_2的尺寸效应:1,3-丁二烯加氢反应 认领 引用 被引量：5
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作者 张鑫 徐柏庆 《高等学校化学学报》 SCIE EI CAS 北大核心 2005年第1期106-110,共5页
在不同温度 (673～ 1 0 73 K)下 ,于流动 N2 气中焙烧 Zr O(OH) 2 醇 (乙醇 )凝胶 ,制备了不同尺寸的Zr O2 -AN纳米晶 (6～ 3 0 nm) .采用沉积 -沉淀方法制备了相应的质量分数为 0 .7%的 Au/Zr O2 -AN催化剂 .用 XRD,XRF,TEM/HRTEM,EDS,... 在不同温度 (673～ 1 0 73 K)下 ,于流动 N2 气中焙烧 Zr O(OH) 2 醇 (乙醇 )凝胶 ,制备了不同尺寸的Zr O2 -AN纳米晶 (6～ 3 0 nm) .采用沉积 -沉淀方法制备了相应的质量分数为 0 .7%的 Au/Zr O2 -AN催化剂 .用 XRD,XRF,TEM/HRTEM,EDS,N2 吸附和 1 ,3 -丁二烯加氢反应对 Zr O2 -AN和 Au/Zr O2 -AN催化剂进行了表征 .结果表明 ,在所有的 Au/Zr O2 -AN样品中 ,Au粒子的平均尺寸为 4～ 5 nm,Zr O2 -AN的颗粒大小没有因为负载 Au粒子而发生改变 . 1 ,3 -丁二烯在 Au/Zr O2 -AN催化剂催化下能以 1 0 0 %的选择性进行加氢反应生成单烯烃 .随着 Au/Zr O2 -AN催化剂中 Zr O2 -AN纳米晶尺寸的增加或“载体”焙烧温度的升高 ,1 ,3 -丁二烯的转化率明显降低 ;1 -丁烯的选择性先增加后减小 ,2 -丁烯中反 /顺异构体的摩尔比在 0 .5～ 1 .0的范围内逐渐增大 ,TEM/HRTEM表征结果清楚地表明 ,Au/Zr O2 -AN催化剂中 Au粒子与 Zr O2 -AN颗粒接触界面 /周边随 Zr O2 -AN颗粒尺寸的减小而明显增加 ,这很可能是含有更小尺寸 Zr O2 -AN纳米粒子的Au/Zr O2 -AN催化剂具有更高的催化活性的重要原因 . 展开更多
关键词 Au/ZrO2催化剂 1,3-丁二烯加氢反应 纳米ZrO2 尺寸效应 多相催化
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焙烧温度对花状Au/CeO2催化剂催化氧化CO活性的影响 认领 引用 被引量：2
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作者 张静静 《工业催化》 CAS 2022年第7期44-48,共5页
以花状CeO2为载体,采用沉积-沉淀法制备质量分数2%Au/CeO2催化剂,借助ICP-AES、XRD、TEM、XPS、H2-TPR等表征手段,研究焙烧温度对Au/CeO2催化剂催化CO氧化活性的影响。结果表明,焙烧温度对催化剂的氧化还原能力影响显著,焙... 以花状CeO2为载体,采用沉积-沉淀法制备质量分数2%Au/CeO2催化剂,借助ICP-AES、XRD、TEM、XPS、H2-TPR等表征手段,研究焙烧温度对Au/CeO2催化剂催化CO氧化活性的影响。结果表明,焙烧温度对催化剂的氧化还原能力影响显著,焙烧后的催化剂低温氧化CO活性明显提高,300℃焙烧制得的催化剂具有最高的CO低温催化活性,18℃下可将体积分数1%的CO催化消除至1.84 mg·m-3。 展开更多
关键词 催化剂工程 焙烧温度 花状Au/CeO2催化剂 CO氧化
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介孔CuO-CeO2复合氧化物负载Au催化剂催化氧化甘油制备二羟基丙酮 认领 引用
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作者 柯义虎 余小梅 +4 位作者 王学 徐换换 曹馨怡 朱钰卿 王非 《化学反应工程与工艺》 CAS 2022年第6期491-501,共11页
以SBA-15为硬模板制备一系列不同Cu和Ce物质的量之比(Cu/Ce比)的介孔CuO-CeO2复合氧化物,并采用均匀沉积沉淀法成功制备了负载型Au催化剂,在无碱条件下,将此催化剂用于催化甘油氧化制备1,3-二羟基丙酮(DHA)反应体系。通过X射线衍射(X... 以SBA-15为硬模板制备一系列不同Cu和Ce物质的量之比(Cu/Ce比)的介孔CuO-CeO2复合氧化物,并采用均匀沉积沉淀法成功制备了负载型Au催化剂,在无碱条件下,将此催化剂用于催化甘油氧化制备1,3-二羟基丙酮(DHA)反应体系。通过X射线衍射(XRD)、透射电镜(TEM)、X射线光电子能谱(XPS),H2程序升温还原(H2-TPR)和CO2程序升温脱附(CO2-TPD)等方法表征了CuO-CeO2复合氧化物以及其负载Au催化剂。结果表明:不同Cu/Ce比下,由于载体结构发生明显的改变,导致催化剂中活性组分Au与载体间、Cu与Ce之间的相互作用以及催化剂的结构存在差异,因此在催化反应中,表现出不同的催化活性。当Cu/Ce比为5:1时,Au/CuO-CeO2催化剂具有较好的催化性能,在反应温度为80℃,初始氧气压力为1 MPa,反应2 h时,甘油转化率为80.3%,DHA的选择性为89.7%。 展开更多
关键词 甘油 1,3-二羟基丙酮 催化氧化 负载Au催化剂 CuO-CeO2复合氧化物
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Study on Chemisorption, Catalytic Behavior, and Stability of Supported Au Catalyst for the Propylene Epoxidation Reaction 认领 引用
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作者 Feifei Sun Shunhe Zhong 《Journal of Natural Gas Chemistry》 2006年第1期45-51,共7页
The supported Au/TiO2 and Au/TiO2-SiO2 catalysts were prepared by deposition precipitation method. The TPD study reveals that propylene oxide competes with propylene to be adsorbed on the same adsorptive center-Ti^n＋... The supported Au/TiO2 and Au/TiO2-SiO2 catalysts were prepared by deposition precipitation method. The TPD study reveals that propylene oxide competes with propylene to be adsorbed on the same adsorptive center-Ti^n＋ site on the surface of the catalyst and that the adisorbing capacity of the catalyst for propylene oxide is larger than that for propylene. Catalytic behavior for propylene epoxidation with H2 and O2 was tested in a micro-reactor. Under typical conditions, the selectivity for propylene oxide is over 87%. The TG curves show that PO successive oxidation cause carbon deposition on the active center and deactivation of the Au catalysts. Because the amounts of Tin＋ site decrease significantly, and consequently the separation between Ti^n＋ sites increases, the Au/TiO2-SiO2 catalyst is more stable than Au/TiO2. 展开更多
关键词 Au/TiO2 Au/TiO2-SiO2 propylene propylene oxide epoxidation catalyst stability
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气氛环境下Au/CeO2催化剂烧结行为的原位电镜研究 认领 引用 被引量：1
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作者 陈炳伟 吴哲敏 +5 位作者 韩仲康 袁文涛 姜颖 杨杭生 王勇 张泽 《电子显微学报》 CAS CSCD 北大核心 2024年第1期52-60,共9页
气氛环境下原位研究催化剂的烧结行为,能够为理解催化剂在预处理以及反应条件下的烧结机理和高稳定催化剂的设计提供重要的实验依据。本文以Au/CeO2模型纳米催化剂为研究对象,利用环境透射电子显微镜原位观察其在O2与CO气氛下的... 气氛环境下原位研究催化剂的烧结行为,能够为理解催化剂在预处理以及反应条件下的烧结机理和高稳定催化剂的设计提供重要的实验依据。本文以Au/CeO2模型纳米催化剂为研究对象,利用环境透射电子显微镜原位观察其在O2与CO气氛下的高温动态烧结过程。实验发现,负载在CeO2上的Au纳米颗粒在O2与CO气氛环境中表现出不同的烧结行为,其在O2气氛下具有较高的烧结速度,同时存在颗粒迁移与聚集长大(particle migration and coalescence,PMC)和奥斯特瓦尔德熟化(Ostwald ripening,OR)两种烧结过程;在CO气氛下烧结速度较慢,烧结过程以OR为主。对比不同气氛环境下烧结后催化剂的表面结构可知,CO增加了CeO2表面台阶的数量以及表面氧空位浓度,增强了载体对Au颗粒的锚定作用,从而提升Au/CeO2催化剂的稳定性。 展开更多
关键词 Au/CeO2模型催化剂 氧气 一氧化碳 烧结 原位透射电镜
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Au和Ag修饰TNTAs阵列及光电催化甘油转化研究 认领 引用
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作者 王旭东 王剑 +3 位作者 田入峰 张王刚 刘一鸣 李晓红 《功能材料》 CAS CSCD 北大核心 2023年第8期8035-8043,8117,共9页
通过阳极氧化法制备TiO2纳米管阵列(TNTAs),管径是60 nm和管长是5.4μm。进一步利用电沉积法制备了Au和Ag修饰的TNTAs/Au和TNTAs/Ag纳米管阵列。评价了负载不同Au和Ag含量对光阳极光电催化转化甘油耦合产氢耦合的影响。结果表明,负... 通过阳极氧化法制备TiO2纳米管阵列(TNTAs),管径是60 nm和管长是5.4μm。进一步利用电沉积法制备了Au和Ag修饰的TNTAs/Au和TNTAs/Ag纳米管阵列。评价了负载不同Au和Ag含量对光阳极光电催化转化甘油耦合产氢耦合的影响。结果表明,负载Au和Ag的TNTAs可将甘油光电催化转化为甘油醛(GLD)、二羟基丙酮(DHA)等高附加值产品并协同产氢。TNTAs/Au(0.08 mmol/L)和TNTAs/Ag(0.04 mmol/L)的催化性能最高,其产氢速率分别为213.8,198.1μmol•cm-2•h-1,甘油转化率为4.6%、4.4%,DHA的选择性为15.4%、15.3%。样品的最佳性能归功于金属纳米颗粒的等离子共振效应,即金属作为电子陷阱有效地聚集了光激发的电子,TiO2导带中的电子被转移到金属上,防止了光生电子-空穴对的复合,有效地提高了TiO2纳米管阵列的催化性能。 展开更多
关键词 TiO2纳米管阵列 Au和Ag助催化剂 光电化学 产氢 甘油
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Selective oxidation by TS-1 coupled with in-situ synthesised H2O2 认领 引用
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作者 Dong Lin Richard J.Lewis +1 位作者 Xiang Feng Graham J.Hutchings 《Fundamental Research》 CSCD 2026年第2期740-744,共5页
Feedstock valorisation with preformed H2O2 in conjunction with titanosilicate zeotypes is particularly attractive due to the increased selectivity,lower operating temperatures and improved process efficiency(par... Feedstock valorisation with preformed H2O2 in conjunction with titanosilicate zeotypes is particularly attractive due to the increased selectivity,lower operating temperatures and improved process efficiency(particularly lower energy usage and enhanced atom economy)compared to aerobic pathways or alternative stoichiometric oxidants.However,numerous environmental and financial concerns associated with the application of commercial H2O2 remain.These concerns have led to a growing interest in the application of the in-situ synthesized oxidant for a range of chemical transformations.Herein,we provide an overview of the key contributions to this emerging field of oxidative catalysis,with a particular focus on propene epoxidation and ketone ammoximation,which are currently two crucial industrial-scale processes that utilise preformed H2O2 with the titanosilicate catalyst TS-1 for chemical synthesis.This contribution will highlight the potential for in-situ H2O2-mediated feedstock upgrading to replace existing technologies and contribute to the declared sustainability goals of the chemical synthesis sector. 展开更多
关键词 Selective oxidation TS-1 Green chemistry In-situ synthesis H2O2 Au/Pd-based catalysts
Highly Efficient Au/TiO2 Catalyst for One-pot Conversion of Nitrobenzene to p-Aminophenol in Water Media 认领 引用 被引量：4
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作者 Luyao Zou Yuanyuan Cui Weilin Dai 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2014年第3期257-262,共6页
Au/TiO2 catalyst is firstly reported to be efficient in the hydrogenation of nitrobenzene to produce p-aminophenol with a high PAP selectivity of 81%and overall yield more than 63%.The catalyst is also quite stable... Au/TiO2 catalyst is firstly reported to be efficient in the hydrogenation of nitrobenzene to produce p-aminophenol with a high PAP selectivity of 81%and overall yield more than 63%.The catalyst is also quite stable and can be reused for at least 4 times with only slight decrease in activity. 展开更多
关键词 nitrobenzene p-aminophenol Au/TiO2catalyst hydrogenation
Synergetic effects of gold-doped copper nanowires with low Au content for enhanced electrocatalytic CO2reduction to multicarbon products 认领 引用 被引量：12
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作者 Zongnan Wei Shuai Yue +2 位作者 Shuiying Gao Minna Cao Rong Cao 《Nano Research》 SCIE EI CSCD 2023年第5期7777-7783,共7页
As efficient catalysts of electrochemical CO2reduction reaction(CO2RR)towards multicarbon(C2+)products,Cu-based catalysts have faced the challenges of increasing the reactive activity and selectivity.Herein,w... As efficient catalysts of electrochemical CO2reduction reaction(CO2RR)towards multicarbon(C2+)products,Cu-based catalysts have faced the challenges of increasing the reactive activity and selectivity.Herein,we decorated the surface of Cu nanowires(Cu NWs)with a small amount of Au nanoparticles(Au NPs)by the homo-nucleation method.When the Au to Cu mass ratio is as little as 0.7 to 99.3,the gold-doped copper nanowires(Cu-Au NWs)could effectively improve the selectivity and activity of CO2RR to C2+resultants,with the Faradaic efficiency(FE)from 39.7%(Cu NWs)to 65.3%,the partial current density from 7.0(Cu NWs)to 12.1 mA/cm2 under−1.25 V vs.reversible hydrogen electrode(RHE).The enhanced electrocatalytic performance could be attributed to the following three synergetic factors.The addition of Au nanoparticles caused a rougher surface of the catalyst,which allowed for more active sites exposed.Besides,Au sites generated*CO intermediates spilling over into Cu sites with the calculated efficiency of 87.2%,which are necessary for multicarbon production.Meanwhile,the interphase electron transferred from Cu to Au induced the electron-deficient Cu,which favored the adsorption of*CO to further generate multicarbon productions.Our results uncovered the morphology,tandem,electronic effect between Cu NWs and Au NPs facilitated the activity and selectivity of CO2RR to multicarbons. 展开更多
关键词 electrochemical CO2reduction multicarbon production bimetallic catalyst Cu nanowires Au nanoparticles
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富氢气体中CO优先氧化催化剂研究进展 认领 引用 被引量：1
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作者 林会 苏慧娟 +3 位作者 郑玉华 孙逊 管仁贵 祁彩霞 《工业催化》 CAS 2014年第5期325-334,共10页
以高纯氢为燃料的质子交换膜燃料电池广泛应用于电动汽车,但其阳极容易被富氢气体中含有的少量CO毒化,造成电池性能严重降低。富氢气体在进入燃料电池前,必须进行CO净化处理。优先氧化法是除去富氢气体中少量CO最简单经济有效的方法,常... 以高纯氢为燃料的质子交换膜燃料电池广泛应用于电动汽车,但其阳极容易被富氢气体中含有的少量CO毒化,造成电池性能严重降低。富氢气体在进入燃料电池前,必须进行CO净化处理。优先氧化法是除去富氢气体中少量CO最简单经济有效的方法,常用催化剂主要有Pt系、Au系和Cu系催化剂。着重阐述负载Au催化剂的制备方法、载体调变、助剂改性以及其他因素(如反应气氛中CO与O2浓度比、水蒸汽和CO2等)对Au催化剂CO优先氧化反应催化性能的影响。介绍以CuO/CeO2催化剂为典型的非贵金属氧化物催化剂用于CO优先氧化反应的研究成果以及制备方法、载体和助剂改性等对催化性能的影响和反相结构CeO2/CuO的催化性能。考虑利用催化剂活性组分,尤其是Au与Cu之间的协同作用,选用合适的载体,进行催化剂组分的设计仍然是今后研究的热点。突破常规无定形金属氧化物作载体,通过设计合成具有特定形貌的载体,研究不同晶面和不同价态等因素对催化剂CO优先氧化催化性能的影响,也是一项很有意义的研究。 展开更多
关键词 催化剂工程 富氢气体 CO优先氧化 金催化剂 CuO催化剂 燃料电池
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金修饰的二氧化钛和二氧化铈无机载体复合催化剂的制备与应用研究 认领 引用 被引量：1
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作者 田甜 张尚文 +4 位作者 熊奎 吴浩民 李亚琼 张傲然 王磊 《广州化工》 CAS 2022年第21期105-106,118,共2页
本文采用溶胶凝胶法和沉积沉淀法,通过改变制备过程中CeO2的相对含量、金陈化时长、焙烧中间载体的温度等自变量的方式制备Au-TiO2-CeO2催化剂。采用SEM和CO气体检测管对催化剂进行比表面积、金附着量及附着均匀程度和氧化结... 本文采用溶胶凝胶法和沉积沉淀法,通过改变制备过程中CeO2的相对含量、金陈化时长、焙烧中间载体的温度等自变量的方式制备Au-TiO2-CeO2催化剂。采用SEM和CO气体检测管对催化剂进行比表面积、金附着量及附着均匀程度和氧化结果等信息的分析。结果显示,催化剂的催化活性在CeO2相对含量为15%,陈化1 h,200℃载体焙烧后的催化效果最好。当自变量的值在最优量两侧时,催化剂的催化活性均大致呈现为下降趋势。 展开更多
关键词 Au-TiO2-CeO2 复合催化剂 溶胶-凝胶法 扫描电子显微镜
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Nanoporous Silicon-Based Ammonia-Fed Fuel Cells 认领 引用
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作者 Tayyar D. Dzhafarov Sureyya Aydin Yuksel Mustafa Aydin 《Materials Sciences and Applications》 2014年第14期1020-1026,共7页
The objective of the paper is to report results on fabrication, structural, morphological and performance characteristics of novel TiO2/PS/Si, Au/TiO2/PS/Si and Au/PS/Si direct ammonia fuel cells (DAFC) using nanoporo... The objective of the paper is to report results on fabrication, structural, morphological and performance characteristics of novel TiO2/PS/Si, Au/TiO2/PS/Si and Au/PS/Si direct ammonia fuel cells (DAFC) using nanoporous silicon (PS) as proton conducting membrane (instead of traditional polymer Nafion membrane) and TiO2, Au/TiO2 or Au as catalyst layer. Porous silicon layers have been prepared by electrochemical modification of silicon substrates. Films containing titanium dioxide are more efficient catalysts for hydrogen production from ammonia solution. The Au/ TiO2/PS/Si cell exhibited the open circuit voltage 0.87 V and performance of 1.6 mW/cm2 with 50% ammonia solution as fuel at room temperature. Mechanisms of proton transport in nanoporous silicon membrane and generation of electricity in DAFC have been considered. Advantages of investigated direct ammonia fuel cells consist in simplicity of fabrication technology, which can be integrated into standard silicon micro fabrication processes and operation of cells at room temperature. The work demonstrates that the PS based fuel cells have potential for portable applications. 展开更多
关键词 Nanoporous Silicon Membrane Fuel Cell Au/TiO2 Catalyst Ammonia Electrolyte Power Density
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