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利用钐掺杂氧化铈提高燃料电池阳极活性

物理化学学报 2003年第9期19卷 844-848页

作者：王世忠 ishihara tatsumi 厦门大学化学系厦门361005 Department of Applied Chemistry Oita UniversityDannoharu 700Oita 870-1192Japan

用浸渍法制备并采用交流阻抗、极化等技术考察了不同组成的Ni-Sm^(3+)掺杂的CeO_2(SDC)复合镍阳极的电化学性能及相应电池的功率输出性能.结果表明,SDC掺入镍阳极后,阳极极化过电位及电池的欧姆电阻显著减小.其中阳极过电位的减小与SDC... 详细信息

用浸渍法制备并采用交流阻抗、极化等技术考察了不同组成的Ni-Sm^(3+)掺杂的CeO_2(SDC)复合镍阳极的电化学性能及相应电池的功率输出性能.结果表明,SDC掺入镍阳极后,阳极极化过电位及电池的欧姆电阻显著减小.其中阳极过电位的减小与SDC掺入镍电极引起的三相界扩展有关,但SDC的掺入同时引起了电极反应活化能的增加,造成低温下Ni-SDC的极化过电位大于纯Ni电极.高温下,Ni-SDC阳极的阻抗谱由两个半圆组成,其中高频半圆随着SDC掺入量的增加而减小,而低频环与SDC的掺入量基本无关.低温下只观察到一个高频环.高频环可能对应三相界反应,而低频环可能对应氢的解离吸附及扩散.75％(w)Ni-25％(w)SDC/La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_3(LSGM)/Sm_(0.5)Sr_(0.5)CoO_3(SSC)在所研究的电池中具有最大功率输出密度,其值在1073、973、873 K下分别达到1.1、0.43、0.14 W·cm^(-2).

关键词：钐掺杂氧化铈燃料电池阳极活性电化学交流阻抗镍阳极

利用钐掺杂的氧化铈夹层提高燃料电池阳极的活性

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物理化学学报 2003年第9期19卷 849-853页

作者：王世忠 ishihara tatsumi 厦门大学化学系厦门361005 Department of Applied Chemistry Oita UniversityDannoharu 700Oita 870-1192Japan

考察了Ni-钐掺杂的氧化铈(Ni-SDC)复合阳极与La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_3(LSGM)电解质中间加入的SDC中间层对阳极及整个电池性能的影响.结果表明,SDC中间层的加入显著减小了阳极极化过电位,但同时引入了欧姆降,降低了电池的功... 详细信息

考察了Ni-钐掺杂的氧化铈(Ni-SDC)复合阳极与La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_3(LSGM)电解质中间加入的SDC中间层对阳极及整个电池性能的影响.结果表明,SDC中间层的加入显著减小了阳极极化过电位,但同时引入了欧姆降,降低了电池的功率输出密度.氢在Ni-SDC电极的氧化主要由两个过程控制,分别对应于交流阻抗谱的两个阻抗半圆,高频环随着SDC中间层的加入显著减小,可能对应于H_2在Ni-SDC/SDC/H_2三相界的电化学氧化或氧从LSGM向SDC的传输,低频环与SDC中间层无关,可能对应于氢在电极表面的解离吸附及吸附物种的扩散过程.使用Ni-SDC/SDC夹层阳极可以明显地提高电池的稳定性.

关键词：钐掺杂氧化铈燃料电池阳极活性镍电极双层阳极极化交流阻抗固体氧化物

Copper-ceria solid solution with improved catalytic activity for hydrogenation of CO to CHOH

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Chinese Journal of Catalysis 2020年第9期41卷 1348-1359页

作者： Bin Yang Wei Deng Limin Guo tatsumi ishihara School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina International Institute for Carbon-Neutral Energy Research Kyushu University744 MotookaNishi-kuFukuoka 8190395Japan Department of Applied Chemistry Faculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 8190395Japan

A copper-ceria solid solution and ceria-supported copper catalysts were prepared and used for the catalytic hydrogenation of CO2 to *** to site-specific classification and quantitative analyses(X-ray diffraction,Raman spectroscopy,X-ray photoelectron spectroscopy,H2 temperature-programmed reduction,and CO adsorption),the interfaces of the prepared catalysts were classified as Cu incorporated into ceria(Cu-Ov-Cex),dispersed Cu O(D-Cu O-Ce O2),and bulk Cu O(B-Cu O-Ce O2)over the Ce O2 *** results,together with those of activity tests,showed that the Cu-Ov-Cex species was closely related to the CO2 hydrogenation activity and resulted in a much higher turnover frequency of CH3OH production than that observed with the D-Cu O-Ce O2 and B-Cu O-Ce O2 ***,the copper-ceria solid solution exhibited improved activity due to the higher Cu-Ov-Cex fraction.

关键词： Copper-ceria Solid solution CO2 hydrogenation Methanol Active site

CO_(2) hydrogenation selectivity shift over In‐Co binary oxides catalysts:Catalytic mechanism and structure‐property relationship

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Chinese Journal of Catalysis 2022年第3期43卷 862-876页

作者： Longtai Li Bin Yang Biao Gao Yifu Wang Lingxia Zhang tatsumi ishihara Wei Qi Limin Guo School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074HubeiChina Chemistry and Material Science College Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310000ZhejiangChina State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China International Institute for Carbon‐Neutral Energy Research Kyushu University744 MotookaNishi‐kuFukuoka 8190395Japan Hubei Key Laboratory of Bioinorganic Chemistry&Materia Medica School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina State Key Laboratory of Advanced Electronic Engineering and Technology School of Electrical and Electrical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina

The hydrogenation of CO_(2) into methanol has attracted much attention and In_(2)O_(3) is a promising *** metal elements into In_(2)O_(3)(M/In_(2)O_(3))is one of the main strategies to improve its ***,its mechanism and active sites remain unclear and need to be further ***,the noble‐metal‐free In_(x)‐Co_(y) oxides catalysts were ***‐improved performance and obvious product selectivity shift were *** optimized catalyst(In_(1)‐Co_(4))(9.7 mmol g_(cat)^(–1) h^(–1))showed five times methanol yields than pure In_(2)O_(3)(2.2 mmol g_(cat)^(–1) h^(–1))(P=4.0 MPa,T=300°C,GHSV=24000 cm^(3)_(STP) g_(cat)^(–1) h^(–1),H_(2):CO_(2)=3).And the cobalt‐catalyzed CO_(2) methanation activity was suppressed,although cobalt was most of the metal *** unravel this selectivity shift,detailed catalysts performance evaluation,together with several in‐situ and ex‐situ characterizations,were employed on cobalt and In‐Co for comparative *** results indicated CO_(2) hydrogenation on cobalt and In‐Co catalyst both followed the formate pathway,and In‐Co reconstructed and generated a surface In_(2)O_(3)‐enriched core‐shell‐like structure under a reductive *** enriched In_(2)O_(3) at the surface significantly enhanced CO_(2) adsorption capacity and well stabilized the intermediates of CO_(2) ***_(2) and carbon‐containing intermediates adsorbed much stronger on In‐Co than cobalt led to a feasible surface C/H ratio,thus allowing the*CH_(3)O to desorb to produce CH_(3)OH instead of being over‐hydrogenated to CH_(4).

关键词： Indium oxide Cobalt CO_(2)hydrogenation Methanol synthesis Core‐shell structure Surface C/H ratio

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