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γ-Bi2O3/TiO2复合纤维的制备及光催化性能 认领 引用 被引量：12
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作者 李跃军 曹铁平 +1 位作者 邵长路 王长华 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2012年第7期687-692,共6页
采用静电纺丝技术与溶剂热法相结合制备了γ-Bi2O3/TiO2复合纤维光催化材料.利用X射线衍射(XRD)、扫描电镜(SEM)、电子能谱(EDS)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和紫外–可见吸收光谱(UV-Vis)等分析测试手段对材料进行了表征,... 采用静电纺丝技术与溶剂热法相结合制备了γ-Bi2O3/TiO2复合纤维光催化材料.利用X射线衍射(XRD)、扫描电镜(SEM)、电子能谱(EDS)、透射电镜(TEM)、高分辨透射电镜(HRTEM)和紫外–可见吸收光谱(UV-Vis)等分析测试手段对材料进行了表征,并以罗丹明B(RB)的脱色降解为模式反应,考察了材料的可见光催化性能.结果表明:γ-Bi2O3纳米片均匀地生长在TiO2纤维上,形成了具有异质结构的γ-Bi2O3/TiO2复合纤维光催化材料,其光谱响应范围拓宽至可见光区,有利于TiO2光生电子和空穴的分离,增强了体系的量子效率.与纯TiO2纤维相比可见光催化活性明显提高,对RB的脱色率达87.8%. 展开更多
关键词 静电纺丝 溶剂热法 γ-Bi2O3/TiO2复合纤维 光催化
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超亲水性介孔SiO2/Bi2O3/TiO2分层薄膜的制备及其自洁净性能研究 认领 引用 被引量：2
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作者 严淑琴 胡芸 +1 位作者 单文杰 韦朝海 《硅酸盐通报》 CAS CSCD 北大核心 2013年第6期1110-1114,共5页
采用溶胶-凝胶/旋转涂覆法在玻璃基板表面制备介孔SiO2/Bi2O3/TiO2分层薄膜。采用XRD、UV-vis及表面接触角测量仪对薄膜的结构、透光性及超亲水性进行分析。结果表明,介孔SiO2/Bi2O3/TiO2分层薄膜仍然保持了表面SiO2的介孔结构,在无光... 采用溶胶-凝胶/旋转涂覆法在玻璃基板表面制备介孔SiO2/Bi2O3/TiO2分层薄膜。采用XRD、UV-vis及表面接触角测量仪对薄膜的结构、透光性及超亲水性进行分析。结果表明,介孔SiO2/Bi2O3/TiO2分层薄膜仍然保持了表面SiO2的介孔结构,在无光照条件下仍具有超亲水性。涂有硬脂酸的薄膜在紫外光照射后恢复了其超亲水性,具有良好的自洁净性能。且SiO2/Bi2O3/TiO2分层薄膜表现出比单独的SiO2/TiO2和SiO2/Bi2O3分层薄膜更高的光催化活性。 展开更多
关键词 介孔SiO2 Bi2O3 TiO2分层薄膜 超亲水性 光催化 自洁净性能
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Formulation,stability,and synergistic characteristics of diesel-inwater Pickering emulsions stabilized by titanium carbide(Ti3C2Tx)MXene and Tween 40 认领 引用
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作者 Nansee S.K.Abu Zaid Aaminah Johar +2 位作者 Mustafa S.Nasser Khaled A.Mahmoud Sagheer A.Onaizi 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期393-421,共29页
Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems com... Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems combining nanoparticles and surfactants offer a promising route to achieving both interfacial stability and formulation efficiency.Among potential nanoparticle candidates,Ti3C2TxMXene exhibits high surface area and interfacial activity.However,its application in diesel-in-water Pickering emulsions under EOR-relevant conditions has not been explored.Challenges such as high hydrophilicity and strong electrostatic repulsion have limited the use of unmodified MXene as a standalone stabilizer in colloidal systems.To address this limitation,diesel-in-water Pickering emulsions were formulated using DL-Ti3C2TxMXene combined with Tween 40(0.5 wt%)and antifoam(0.15 wt%),aiming to investigate their synergistic stabilization behavior across MXene concentrations ranging from 0.1 to 1.5 wt%.The MXene-only system exhibited complete and immediate phase separation,whereas the hybrid emulsions demonstrated markedly enhanced stability,with no phase separation observed at 0.1 and 0.5 wt%after 24 h.A concentration-dependent trend was evident.At lower MXene contents,interfacial adsorption improved,and droplet sizes remained small and uniform.At higher concentrations(≥1.0 wt%),aggregation increased,and demulsification became more pronounced.Interfacial tension decreased steadily with increasing MXene content,reaching 0.86 mN/m at1.5 wt%,while zeta potential remained strongly negative(-47.7 mV at 0.5 wt%),indicating sufficient electrostatic repulsion.Rheological analysis revealed a transition to shear-thinning behavior at higher MXene contents,confirming the formation of internal network structures.Compared to other reported systems based on silica(SiO2),zinc oxide(ZnO),or functionalized MXenes,the MXene-Tween 40formulation achieved superior short-and long-term emulsion stability without requiring surface modification or external stimuli.To the best of our knowledge,this is the first study to report the successful stabilization of diesel-in-water Pickering emulsions using unmodified Ti3C2TxMXene.These findings highlight the synergistic interaction between MXene and Tween 40 and present a robust,surfactant-lean formulation suitable for oilfield applications. 展开更多
关键词 Titanium carbide(Ti3C2Tx)MXene nanosheets Oil-in-water(O/W)Pickering emulsions Tween 40 chemical surfactant Pickering emulsion characteristics Emulsion stability Emulsion rheology
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High-efficiency Photocatalytic Performance of Bi/Bi2Fe4O9Nanocomposites Synthesized by Hydrothermal Method for Degradation of Bisphenol A 认领 引用
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作者 WANG Junjie LI Yijie +1 位作者 LI Xinyi GUO Dongyun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期364-370,共7页
Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces... Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces was attributed to the reducibility of 2-methoxyethanol in the precursor solution.Comparative photocatalytic evaluation reveals that the Bi/Bi2Fe4O9nanocomposites significantly enhance the degradation efficiency(99.0%)of bisphenol A compared with Bi2Fe4O9nanosheets(64.2%)under 120 min simulated solar irradiation.This remarkable enhancement can be attributed to the established Bi/Bi2Fe4O9heterojunction structure,which effectively facilitates the separation of photogenerated electron-hole pairs and accelerates interfacial charge transfer between the metallic Bi nanodots and semiconductor Bi2Fe4O9nanosheets.The synergistic effects arising from this unique architecture ultimately lead to superior photocatalytic performance. 展开更多
关键词 Bi2Fe4O9 nanosheets Bi nanodots nanocomposite hydrothermal method photocatalytic performance
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V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NOx和N2O 认领 引用
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作者 苗静文 樊星 +1 位作者 刘若雯 张雅坤 《环境工程》 CAS CSCD 2026年第2期103-111,共9页
针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础... 针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础上,重点考察了在V2O5/TiO2催化剂之后串接2.0Cs/Co3O4催化剂的联合催化脱除NOx和N2O的性能,并采用N2吸脱附、XRD、XPS和O2-TPD等手段对催化剂理化特性进行表征。结果表明:V2O5/TiO2催化还原NOx时,进气中含2%H2O有利于拓宽活性温度窗口和提高N2选择性,以及抑制N2O形成。在Co3O4表面负载2.0%Cs显著提高了催化剂催化N2O分解性能,这可能与Cs的引入导致部分Co3+还原为Co2+以及催化剂表面形成了更多氧空位有关。高温(400℃)下通入2%H2O对2.0Cs/Co3O4催化N2O分解的抑制作用较弱,但同时通入2%H2O和50×10-6 NO显著抑制了2.0Cs/Co3O4催化剂的活性。采用先V2O5/TiO2后2.0Cs/Co3O4的两段式催化剂联合脱除NOx和N2O时,前端的V2O5/TiO2催化剂主要催化NOx的还原反应,N2O对脱硝过程的影响有限;在V2O5/TiO2催化剂高效脱除NOx(和NH3)的温度范围内,后端的2.0Cs/Co3O4催化剂可较为稳定地催化N2O分解;在温度400℃,进气中含2%H2O时,NOx和NH3转化率均接近100%,N2O转化率为61.3%。 展开更多
关键词 NOx还原 N2O分解 V2O5/TiO2 Cs/Co3O4 联合催化
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S型Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2异质结光催化剂的制备及其对RhB的可见光降解机理 认领 引用
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作者 李冬梅 贺帅 +5 位作者 蒋树贤 陈志翔 吴汉杰 张津明 戴自强 刘子业 《环境工程学报》 CAS CSCD 北大核心 2026年第7期2195-2208,共14页
本研究以Bi6O5(OH)3(NO3)5·3H2O(BON)、KBr及KI作为前驱体,利用水热法一步合成Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2(BON@BI)。通过改变BON与BiOBr0.8I0.2(BI)的质量比,探讨BON... 本研究以Bi6O5(OH)3(NO3)5·3H2O(BON)、KBr及KI作为前驱体,利用水热法一步合成Bi6O5(OH)3(NO3)5·3H2O/BiOBr0.8I0.2(BON@BI)。通过改变BON与BiOBr0.8I0.2(BI)的质量比,探讨BON@BI异质结的光催化活性以及对罗丹明B(RhB)的光催化降解机理。结果表明:当BON与BI的质量比为2:8时,对应的20%BON@BI可见光催化活性最强,记为BON@BIOPT,在可见光照30 min时对RhB的光降解率高达99.8%,约为BI光降解率(52.2%)的2倍。BON@BIOPT表面呈现均匀纳米片的杆状形貌,比表面积由BI的32.54 m2·g-1增至44.7 m2·g-1。BON@BIOPT的最大吸收边由BI对应的560 nm红移至580 nm,禁带宽度由BI的2.55 eV缩窄至2.43 eV。BON与BI复合形成S型异质结构,界面处形成的内建电场,有效抑制了强还原性光生电子与强氧化性光生空穴的结合并生成主要活性自由基O2·-与h+。BON@BIOPT具有良好的稳定性。经过7次重复对RhB的降解实验后,光降解效率仍高达88.6%。BON@BIOPT具有较好的抗干扰性。在不同pH以及阴离子的干扰下,降解率依然高达85%~98%。RhB的光降解过程包括N-去乙基化、断链共轭发色团、去氨基化等反应,并最终被矿化为低分子量有机物、无机盐、CO2和H2O。以上结果表明,BON@BIOPT兼具优异的光催化活性、稳定性及环境适应性,在实际水体有机污染物治理中具有良好的应用潜力。 展开更多
关键词 Bi6O5(OH)3(NO3)5·3H2O BiOBr0.8I0.2 S型异质结 内建电场 可见光催化活性 光降解特性
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等离子体协同S型Bi@Bi2S3/CeO2复合纤维可控合成及CO2光还原 认领 引用
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作者 曹铁平 李跃军 孙大伟 《硅酸盐学报》 EI CAS CSCD 北大核心 2026年第1期184-194,共11页
针对传统光催化剂载流子复合严重、CO2吸附活化不足的难题,通过静电纺丝-水热两步法合成了Bi@Bi2S3/CeO2复合纤维。扫描电子显微镜与透射电子显微镜揭示,Bi2S3以不同形貌构筑于CeO2纤维表面,原位生成的Bi纳米颗粒... 针对传统光催化剂载流子复合严重、CO2吸附活化不足的难题,通过静电纺丝-水热两步法合成了Bi@Bi2S3/CeO2复合纤维。扫描电子显微镜与透射电子显微镜揭示,Bi2S3以不同形貌构筑于CeO2纤维表面,原位生成的Bi纳米颗粒均匀锚定在Bi2S3表面,形成独特的三维立体结构。X射线光电子能谱与电子顺磁共振谱证实,Bi2S3与CeO2通过S型异质结实现载流子定向分离,高活性电子保留在Bi2S3导带用于CO2还原,强氧化空穴留存于CeO2价带驱动水氧化;Bi纳米颗粒的表面等离子体共振(SPR)效应使可见光吸收能力增强,同时可为体系分流更多高活性电子。在模拟太阳光照下,Bi@Bi2S3/CeO2复合纤维生成CO速率达14.58μmol·g-1·h-1(选择性72%),是纯CeO2纳米纤维的10倍,同时有部分CH4生成(5.68μmol·g-1·h-1)。5次循环后活性仍保持90%以上。通过分级结构设计,协同S型异质结与SPR效应,为解决CeO2基催化剂的性能瓶颈,实现CO2光还原提供了“结构-界面-组分”三重调控的新模式。 展开更多
关键词 表面等离子体共振 S型异质结 Bi@Bi2S3/CeO2复合纤维 可控合成
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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Bi/Bi2O2CO3等离子体复合材料的合成及其光催化性能 认领 引用
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作者 屈梦原 游康伟 +3 位作者 谢丽燕 王雅馨 罗志珊 黄建辉 《材料研究学报》 EI CAS CSCD 北大核心 2026年第5期343-351,共9页
以多聚甲醛作为碳源和还原剂,用一步水热法在Bi2O2CO3纳米片表面原位生长铋纳米颗粒(Bi NPs)构建Bi/Bi2O2CO3等离子体复合材料,使用XRD、SEM、TEM、XPS及UV-Vis DRS等手段表征其晶体结构、微观形貌、化学态和光学性能... 以多聚甲醛作为碳源和还原剂,用一步水热法在Bi2O2CO3纳米片表面原位生长铋纳米颗粒(Bi NPs)构建Bi/Bi2O2CO3等离子体复合材料,使用XRD、SEM、TEM、XPS及UV-Vis DRS等手段表征其晶体结构、微观形貌、化学态和光学性能,并以孔雀石绿(MG)和环丙沙星(CIP)为目标污染物评价其光催化活性。结果表明,铋纳米颗粒均匀分布在Bi2O2CO3表面,改变前驱体中铋与碳的摩尔比可精准调节其负载量。Bi与Bi2O2CO3质量比为1:10的复合材料其光催化性能最佳,反应速率分别比纯Bi2O2CO3和纯Bi粉末提高3.5倍和19.7倍。性能的提高可归因于金属Bi表面的等离子体共振(SPR)效应和Bi/Bi2O2CO3异质结的协同作用:一方面显著增强可见光吸收,另一方面促进光生载流子的分离和迁移,并抑制电子-空穴复合。ESR与活性物种捕获实验结果证实,超氧自由基和羟基自由基对MG和CIP的降解起了关键的作用。 展开更多
关键词 复合材料 光催化性能 水热法 Bi/Bi2O2CO3
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Air-reactive cladding assisted brazing of Y2O3-MgO nanocomposite ceramic to TC4 alloy:Interfacial reaction mechanism and mechanical property 认领 引用
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作者 Ming Gao Bo Zhang +4 位作者 Lixia Zhang Zhan Sun Qing Chang Degang Li Jun Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第8期407-418,共12页
Y2O3-MgO nanocomposite ceramic,as a novel infrared window material,exhibits superior properties compared to traditional infrared window materials.To realize its engineering application in high-speed aircraft suc... Y2O3-MgO nanocomposite ceramic,as a novel infrared window material,exhibits superior properties compared to traditional infrared window materials.To realize its engineering application in high-speed aircraft such as unmanned aerial vehicles,the reliable joining between Y2O3-MgO nanocomposite ceramic and TC4 alloy is a key challenge.In this study,the surface of Y2O3-MgO nanocomposite ceramic was first clad in air using an Ag-CuO-Al2O3 filler,which achieved uniform spreading on the ceramic.Subsequently,vacuum brazing was successfully performed between the clad Y2O3-MgO nanocomposite ceramic and TC4 alloy using AgCu filler.The microstructure and mechanical properties of the brazed joints were studied in detail.The air-reactive cladding technique significantly improved wettability,reducing the wetting angle of the filler metal on Y2O3-MgO nanocomposite ceramic from 104°to 27°.The brazed joint interface treated with the Ag-CuO-Al2O3 cladding exhibited sound metallurgical bonding without defects.The main phases identified in the Y2O3-MgO ceramic-side reaction layer were Cu2Y2O5,Mg0.78Cu0.22O,and Y4Al2O9.Analysis and calculations reveal that Cu2Y2O5 and Mg0.78Cu0.22O are respectively formed by the reaction of CuO with Y2O3and MgO,while Y4Al2O9 results from the reaction between Al2O3 and Y2O3.The typical interfacial microstructure was:Y2O3-MgO/Cu2Y2O5+Mg0.78Cu0.22O+Y4Al2O9/CuxTi6-xO+Ag(s,s.)/Ti(s,s.)+Ti2Cu/TC4.The joint achieved a maximum shear strength of 66 MPa under optimal parameters of 24 mol%CuO in the cladding layer and a brazing parameters of 860°C for 20 min. 展开更多
关键词 Y2O3-MgO nanocomposite ceramic Ag-CuO-Al2O3 Air-reactive cladding Brazing Interfacial reaction
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Extrinsic Er2O3-inspired H2O adsorption and dissociation on surface of industrial fly ash-derived SiO2 aerogel in electrocatalytic CO2 reduction 认领 引用
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作者 Lifeng Han Haorun Li +10 位作者 Kunming Hou Yan Guo Hao Wu Mengbo Zou Yulu Wang Zhihua Guo Huangdong Wang Guixiang Ma Shangpeng Liu Xiaojun Gu Shanghong Zeng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期714-724,I0017,共11页
Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO_(2... Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO2RR).However,how to select and arrange active sites on its surface poses significant challenges due to its non-conductive nature.Here,we subtly designed and synthesized multi-component architectures to achieve the high efficiency of CO2RR to CO.The embedding of active and amorphous nitrogen-doped carbon(NC)nanosheets on the surface and inside of SiO2aerogel ensures the charge transport on the catalyst surface,and Er2O3improves dissociation of H2O,enabling the supply of protons for CO2RR.Simultaneously,Er2O3-induced defects/vacancies,nanoclusters coordinated with N on amorphous NC and single Ni in NC play crucial role in enhancing adsorption and activation of CO2.Consequently,the Ni-Er2O3/NC-SiO2catalyst exhibits the maintenance of FECOhigher than 95%over a wide potential window(-0.22 to-1.12 V vs.RHE)in a flow cell with gas-liquid-solid electrode.This work not only provides an atomistic understanding of nature of active sites in CO2RR but also contributes to the secondary utilization of industrial fly ash for a carbon-neutral future. 展开更多
关键词 Fly ash utilization SiO2aerogel Er2O3 H2O dissociation CO2electrochemical reduction
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Ionic potential mediated compositional-structural dual gradient engineering in P2/O3 cathodes for high-energy sodium storage 认领 引用
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作者 Zongyu Guan Meng Li +8 位作者 Ao Chen Jihuan Xie Aoci Yang Yang Gu Guoyao Pang Kuan Wang Weidong Zhuang Jiangtao Hu Biwei Xiao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期791-800,I0019,共10页
Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by rel... Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by relatively low energy density.Here,we report a scalable Mn-Fe-Ni layered oxide with a compositional-structural dual-gradient(DG)architecture synthesized via a three-step co-precipitation method.By exploiting the opposite roles of high-ionic-potential Mn and low-ionic-potential Fe in stabilizing the P2 and O3 frameworks,respectively,a pure compositional Mn/Fe gradient is translated into a structural P2/O3 gradient with precisely guided synthesis conditions.The Fe-deficient surface effectively suppressed Fe4+-induced side reactions,while the stable P2-type shell and the enlarged R value of the O3 core further enhanced cycling stability during structural evolution.The optimized cathode delivered an energy density of 478 Wh kg-1at 4.2 V,with 82%capacity retention after 200 cycles in half cells and 91%retention after 1600 cycles in full cells.This study demonstrates a viable pathway for developing high-energy-density and long-lifetime cathodes for sodium-ion batteries. 展开更多
关键词 Sodium-ion battery Cathode Double-gradient materials O3/P2 materials
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纳米Bi2O3和Sb2O3掺杂对Y-Ba-Cu-O超导块材生长和性能的影响 认领 引用
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作者 李国政 王妙 《物理学报》 SCIE EI CAS CSCD 北大核心 2026年第16期266-272,共7页
RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方... RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方法.本文采用011型熔渗生长工艺研究纳米BiO3和SbO3掺杂对Y-Ba-Cu-O(YBCO)超导块材生长和性能的影响.结果表明,质量分数0.5%的纳米BiO3掺杂不会影响YBCO块材的正常生长,且样品的悬浮力和Jc性能均有所提升.但质量分数0.5%纳米SbO3掺杂的样品的生长区明显缩小,且整个生长区出现周期性宏观偏析带现象,同时样品的悬浮力和J性能显著降低.高掺杂量(质量分数5%)样品的X射线衍射分析结果证实了纳米BiO3/SbO3掺杂的样品中出现了YBi-2411/YSb2411相.扫描电子显微镜结果表明,质量分数5%纳米BiO3掺杂的样品中观察到大量的YBi-2411纳米粒子,其分布密度极高,表明在YBCO体系中原位生成YBi-2411纳米粒子非常容易.综合掺杂物对样品生长和性能的影响,纳米BiO3可视为针对YBCO超导块材的一种安全且优异的掺杂物,也有潜力成为提升所有REBCO系列超导体性能的通用掺杂物.本文结果对进一步提高YBCO超导块材的性能有重要意义。 展开更多
关键词 Y-Ba-Cu-O 熔渗生长 纳米BiO3掺杂 纳米Sb2O掺杂 超导性能
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In2S3/HOF S-scheme heterojunction for enhanced photocatalytic H2O2 production 认领 引用
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作者 Yong Zhang Wenjun Zhu +1 位作者 Yanyan Zhao Shumin Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第5期261-273,共13页
As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their ... As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their practical application in photocatalytic H2O2production.To address the above challenges,this work employs a wet chemical method to grow In2S3nanosheets in situ on the surface of highly stable HOF nanorods(PFC-1),resulting in a novel inorganic/organic In2S3/PFC-1(IP)S-scheme heterojunction.The optimal IP composite achieves a significantly improved photocatalytic H2O2evolution rate of 3.78 mmol g-1h-1,which is 2.9-and 3.7-fold than that of In2S3and PFC-1,respectively.The elevated visible-light absorption,abundant active sites,and effective charge separation of IP S-scheme heterojunction result in the improvement in photocatalytic performance.Additionally,photocatalytic H2O2production of IP goes through a two-electron O2 reduction reaction pathway.This work offers a novel strategy for the fabrication of efficient HOF-based S-scheme heterostructures and their application in photocatalytic field. 展开更多
关键词 Hydrogen-bonded organic frameworks In2S3 S-scheme photocatalyst O2 reduction Photocatalytic H2O2production
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Ni-O-Nd active structure over inverse Nd2O3/Ni catalyst enables efficient CO2 hydrogenation to methane 认领 引用
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作者 Mingxue Wang Junliang Xia +4 位作者 Yu Xie Jinyan Cao Jianjun Chen Qiulin Zhang Ping Ning 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第8期979-990,I0021,共12页
Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temper... Catalytic CO2methanation exhibited significant potential for carbon reduction and energy storage,but still faced tough challenges due to poor abilities for CO2activation and oxygenate hydrogenation at low temperatures.Herein,an inverse Nd2O3/Ni catalyst with Ni‑O‑Nd structures as catalytically active sites was facilely constructed.It achieved>80%CO2conversion with a CH4space‑time yield up to 143.4 mmol gcat-1h-1at 225℃and 1 bar,which far exceeded its counterpart(Nd2O3+Ni,27.8 mmol h-1),representing one of the state‑of‑the‑art CO2methanation catalysts.Systematic characterizations revealed that the well‑dispersed Nd species on Ni substrate over inverse Nd2O3/Ni enhanced Ni‑Nd2O3interaction and promoted the formation of Ni‑O‑Nd interface.Then,its surface basicity and local environment of Ni was greatly optimized,thus enhancing CO2adsorption and oxygenate hydrogenation abilities.In situ spectra and DFT calculations revealed that instead of the sole carbonyl pathway over Nd2O3+Ni,the Ni‑O‑Nd interface over the inverse Nd2O3/Ni brought a supplementary formate pathway with low energy barriers.Besides,it enabled lower energy barriers for CO2dissociation(0.30 vs 0.61 eV)and CO∗hydrogenation(0.70 vs 0.84 eV).Consequently,CO2activation and oxygenate hydrogenation ability over this inverse catalyst could be greatly enhanced,contributing to its excellent activity. 展开更多
关键词 CO2methanation Inverse Nd2O3/Ni catalyst Ni–O–Nd structure HCOO*and CO*pathway Oxygenate hydrogenation
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Bi2O2CO3@Bi-MOF光催化剂的合成及光催化降解罗丹明B 认领 引用
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作者 何世健 胡思语 +2 位作者 邹慧欣 雷姣 张秋云 《辽宁化工》 CAS 2026年第3期385-388,共4页
采用一锅水热法将Bi2O2CO3负载到Bi-MOF得到Bi2O2CO3@Bi-MOF复合光催化剂,利用XRD、FTIR、SEM-EDS及UV-Vis DRS等技术对其结构、形貌、光学性能等进行分析,并在模拟可见光照射下,以罗丹明B(RhB)作为目标污染物,研究... 采用一锅水热法将Bi2O2CO3负载到Bi-MOF得到Bi2O2CO3@Bi-MOF复合光催化剂,利用XRD、FTIR、SEM-EDS及UV-Vis DRS等技术对其结构、形貌、光学性能等进行分析,并在模拟可见光照射下,以罗丹明B(RhB)作为目标污染物,研究其光催化性能。结果表明,可见光照射80 min后对50 mL、40 mg·L-1 RhB的降解率可达91.2%。 展开更多
关键词 Bi-MOF Bi2O2CO3 负载 光催化降解 RhB
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Bi/TiO2∶Sm3+复合纤维的制备及可见光催化降解抗生素洛美沙星 认领 引用
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作者 李跃军 曹铁平 孙大伟 《硅酸盐通报》 CAS 北大核心 2025年第5期1918-1926,共9页
以静电纺丝技术制备TiO2∶Sm3+纳米纤维,结合原位水热法,在葡萄糖酸钠作用下,合成Bi/TiO2∶Sm3+复合纤维。利用XRD和XPS表征样品的物相和组成,利用SEM和TEM观察样品的微观形貌,利用紫外-可见漫反射光谱和瞬态光电流等分析... 以静电纺丝技术制备TiO2∶Sm3+纳米纤维,结合原位水热法,在葡萄糖酸钠作用下,合成Bi/TiO2∶Sm3+复合纤维。利用XRD和XPS表征样品的物相和组成,利用SEM和TEM观察样品的微观形貌,利用紫外-可见漫反射光谱和瞬态光电流等分析样品的光电性能。结果表明,Sm3+进入TiO2晶格,占据Ti4+的位置,造成TiO2晶格膨胀,引起晶格畸变。稀土掺杂引入的晶格缺陷能够提高TiO2的费米能级,增加表面能量壁垒,使光生电子和空穴在表面的复合概率降低;金属Bi通过表面等离子体共振效应,结合稀土元素丰富的能级结构和4f电子跃迁特性,对TiO2进行双重修饰改性,进一步提高了TiO2的光催化活性和稳定性。可见光照5 h,Bi/TiO2∶Sm3+复合纤维对洛美沙星的降解效果最佳,达到97.37%,分别是Sm3+∶TiO2和Bi/TiO2的1.7和1.3倍。 展开更多
关键词 Bi/TiO2∶Sm3+复合纤维 洛美沙星 表面等离子体共振 稀土离子掺杂 可见光催化活性
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生物质炭基复合肥施用对砂质水稻土NH3挥发和N2O排放的影响 认领 引用 被引量：1
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作者 龚雪柳 覃景嵩 +7 位作者 吴佳蓉 赵近凯 冯彦房 卞荣军 郑聚锋 张旭辉 李恋卿 潘根兴 《农业资源与环境学报》 CAS CSCD 北大核心 2026年第2期366-376,共11页
为探究稻壳炭基复合肥替代市售复合肥对砂质稻田土壤氨(NH3)挥发、氧化亚氮(N2O)排放及水稻产量和氮肥农学效率的影响及其影响因素,本研究采用土柱试验法,设置CK(不施肥)、商品复合肥A(N-P2O5-K2O=15-10-10)、商品复合肥... 为探究稻壳炭基复合肥替代市售复合肥对砂质稻田土壤氨(NH3)挥发、氧化亚氮(N2O)排放及水稻产量和氮肥农学效率的影响及其影响因素,本研究采用土柱试验法,设置CK(不施肥)、商品复合肥A(N-P2O5-K2O=15-10-10)、商品复合肥B(N-P2O5-K2O=15-15-15)和炭基复合肥(N-P2O5-K2O=15-10-10,11%生物质炭)4个处理,通过连续气流法和静态暗箱法测定水稻主要施肥期土壤NH3挥发和N2O通量,分析等氮条件下炭基复合肥料施用对土壤NH3挥发、N2O排放和水稻产量的影响及其与关键环境因子之间的关系。结果表明,与复合肥A和复合肥B处理相比,炭基复合肥处理下土壤NH3挥发分别增加了55.72%和56.85%,而土壤N2O累积排放量分别降低了67.82%和58.03%。土壤NH3挥发与土壤pH值和脲酶活性呈显著相关(P<0.05),土壤N2O排放通量与土壤NH4+-N和NO3--N含量、土柱表面水pH值和NH4+-N含量及产量均呈极显著相关(P<0.01)。研究表明,不同施肥条件下土壤pH值和脲酶活性是影响NH3挥发的重要因子,而N2O排放则受土壤NH4+-N和NO3--N含量、土柱表面水pH值和NH4+-N含量的影响。炭基复合肥处理与常规复合肥处理对水稻产量和氮肥农学利用率的影响不显著。施用炭基复合肥替代常规市售复合肥料,在水稻稳产的同时显著降低土壤N2O排放,但增加了氨挥发排放的风险。 展开更多
关键词 炭基肥 氨挥发 氧化亚氮 肥料农学效率 水稻
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Enhanced photoelectrochemical performance of TiO2/Sb2S3 nanorod arrays by annealing in Ar ambience 认领 引用
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作者 SUI Meirong GU Xiuquan 《Optoelectronics Letters》 EI 2025年第7期385-390,共6页
In this work,the TiO2/Sb2S3 nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC... In this work,the TiO2/Sb2S3 nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC activity of TiO2/Sb2S3 composite sample was investigated by electrochemical impedance analysis,including Nyquist and Mott-Schottky(M-S)plots.It was demonstrated that vacuum annealing could crystallize Sb2S3 component and change its color from red to black,leading to an increment of photocurrent density from 1.9 A/m2 to 4.25 A/m2 at 0 V versus saturated calomel electrode(VSCE).The enhanced PEC performance was mainly attributed to the improved visible light absorption.Moreover,annealing treatment facilitated retarding the electron-hole recombination occurred at the solid/liquid interfaces.Our work might provide a novel strategy for enhancing the PEC performance of a semiconductor electrode. 展开更多
关键词 electrochemical impedance analysisincluding visible light absorption TiO2/Sb2S3nanorod arrays nanorod arrays nras vacuum annealing annealing treatment increment o photoelectrochemical performance
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LiCl-Li2O熔盐中U3O8的电化学还原及机理研究 认领 引用
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作者 程仲平 任健 +2 位作者 肖益群 贾艳虹 何辉 《核化学与放射化学》 CAS CSCD 北大核心 2026年第3期289-296,I0002,共8页
传统湿法后处理技术(如PUREX流程)存在废液生成量大、操作复杂等问题,而干法熔盐电解技术因其高效、废物量少等优势备受关注。通过干法熔盐电解技术将氧化物乏燃料转化为金属燃料是推动我国一体化快堆建设、实现闭式核燃料循环的关键环... 传统湿法后处理技术(如PUREX流程)存在废液生成量大、操作复杂等问题,而干法熔盐电解技术因其高效、废物量少等优势备受关注。通过干法熔盐电解技术将氧化物乏燃料转化为金属燃料是推动我国一体化快堆建设、实现闭式核燃料循环的关键环节。然而,我国在氧化物乏燃料电化学还原方面的研究报道较少,相关理论基础、实验方法及技术均相对薄弱。考虑到氧化物乏燃料中主要成分是UO2,在首端过程中UO2芯块通过氧化挥发技术转变为U3O8粉末。为此,本工作以U3O8固体粉末为对象,通过循环伏安法(CV)和恒电位电解实验,系统探究其在650℃的LiCl-Li2O熔盐中的电化学还原机理,并借助X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对电解产物的物相组成、微观形貌与元素分布进行表征。结果显示,电位扫描(1.50 V至0.00 V(vs.Li+/Li,下同))中观察到六个还原峰(c1—c6)及五个对应氧化峰(a1—a5),其中c1峰(0.00 V)为Li沉积,c2—c6峰(0.15-0.84 V)对应U3O8逐步还原为UO2和金属U的过程。恒电位电解实验显示在1.95 V下仅生成UO2相;1.20 V下产物为UO2与Li2UO4共存;而0.10~0.70 V未检测到金属U。这些结果表明U3O8电化学还原机理可能是:(1)与Li+发生氧化还原反应生成UO2和Li2UO4;(2)Li2UO4进一步还原为UO2;(3)UO2逐步电脱氧形成U。脉冲式恒电压电解产物经XRD与SEM/EDS分析证实其中存在金属U和UO2,说明U3O8固体粉末在LiCl-Li2O熔盐体系中可直接电化学还原为金属U。通过直接氧化法测定,U3O8的平均还原率为45.47%,平均电流效率为22.86%。本研究阐明了U3O8在熔盐体系中的多步还原机制,揭示了关键中间产物的转化规律,为优化氧化物乏燃料电化学还原工艺参数(如电位控制、熔盐组分设计)提供了理论依据,对实现金属燃料的高效制备及核能可持续发展具有重要意义。 展开更多
关键词 干法后处理 LiCl-Li2O熔盐 U3O8 电化学还原
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