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Ln_2MO_4 cathode materials for solid oxide fuel cells

Science China chemistry 2011年第6期54卷 898-910页

作者： zhao hui, li qiang & sun liping key laboratory of functional inorganic material chemistry, ministry of education School of chemistry and materials Science, Heilongjiang University, Harbin 150080, China key laboratory of functional inorganic material chemistry Ministry of Education School of chemistry and materials Science Heilongjiang University Harbin China

One of the major challenges to develop "intermediate temperature" solid oxide fuel cells is finding a novel cathode material, which can meet the following requirements: (1) high electronic conductivity; (2) chemical compatibility with the electrolyte; (3) a matched thermal expansion coefficient (TEC); (4) stability in a wide range of oxygen partial pressure; and (5) high catalytic activity for the oxygen reduction reaction (ORR). In this short review, a survey of these requirements for K2NiF4-type material with the formula Ln2MO4, Ln = La, Pr, Nd, Sm; M = Ni, Cu, Fe, Co, Mn, is presented. The composition-dependent TEC, electrical conductivity and oxygen transport property are considered. The Ln2MO4 materials exhibit improved chemical stability and compatibility with most of the traditional electrolytes. The complete fuel cells integrated with Ln2MO4 materials as cathodes show promising results. Furthermore, these materials are considered as cathodes of protonic ceramic fuel cell (PCFC), and/or anodes of high temperature steam electrolysis (HTSE). First results show excellent performances. The versatility of these Ln2MO4 materials is explained on the basis of structural features and the ability to accommodate oxygen non-stoichiometry.

关键词： intermediate temperature solid oxide fuel cells (ITSOFCs) cathode K2NiF4-type structure oxygen non-stoichiometry

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Supercapacitor Performance of Hollow Carbon Spheres by Direct Pyrolysis of Melamine-formaldehyde Resin Spheres

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Chemical Research in Chinese Universities 2013年第4期29卷 735-742页

作者： MA Fang-wei sun li-ping zhao hui li qiang HUO li-hua XIA Tian GAO Shan key laboratory of functional inorganic material chemistry Ministry oJ Education School of Chemistry and Material Science key laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion of Heilongjiang Province Heilong/iang University Harbin 150080 P. R. China

The nitrogen and oxygen co-doped hollow carbon spheres（HCSs） were prepared via a simple pyrolysis of solid melamine-formaldhyde resin spheres. The carbonization temperature has an important influence on the specific surface area, pore-size distribution and heteroatom contents of HCSs. The synergistic effects of those physical and chemical properties on supercapacitor performance were systematically investigated. Among the HCSs obtained at different temperatures, HCSs-800（co-doped HCSs at 800℃） exhibits the best reversible specific capacitance in 2 mol/L H2SO4 electrolyte and meanwhile maintains a high-class capacitance retention capability. The nitrogen heteroatoms were confirmed to play a crucial role in improving capacitance in an acid medium. This kind of nitrogen doved HCSs is a potential candidate for an efficient electrode material for supercapacitors.

关键词： Hollow carbon sphere Pyrolysis Melamine-formaldehyde resin Supercapacitor Nitrogen-dope

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Nd_(0.96)BaCo_(2)O_(6-δ)阴极的微结构调控与电化学性质研究

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黑龙江大学自然科学学报 2022年第5期39卷 548-554,F0003页

作者：孙丽萍赵辉黑龙江大学化学化工与材料学院功能无机材料化学教育部重点实验室哈尔滨150080

采用EDTA-柠檬酸法合成了Nd_(0.96)BaCo_(2)O_(6-δ)阴极材料,利用聚苯乙烯(PS)微球为造孔剂对Nd_(0.96)BaCo_(2)O_(6-δ)电极微观结构进行了优化,考察了电极微观结构对其电化学性能的影响。结果表明,电极的微观孔隙率随PS微球加入量的... 详细信息

采用EDTA-柠檬酸法合成了Nd_(0.96)BaCo_(2)O_(6-δ)阴极材料,利用聚苯乙烯(PS)微球为造孔剂对Nd_(0.96)BaCo_(2)O_(6-δ)电极微观结构进行了优化,考察了电极微观结构对其电化学性能的影响。结果表明,电极的微观孔隙率随PS微球加入量的增大而增大,阴极极化电阻随着PS微球加入量的增加逐渐降低,加入30wt.%PS球作为造孔剂的阴极性能最佳,700℃时空气中极化面电阻仅为0.015Ω·cm^(2)。阴极反应机制研究表明,电极微观结构的调控显著优化了阴极上氧扩散过程,促进了氧还原反应进程,电荷转移过程为阴极上氧还原(ORR)反应的决速步骤。

关键词：固体氧化物燃料电池(SOFC) Nd_(0.96)BaCo_(2)O_(6-δ) 阴极微结构电极反应

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Engineering oxygen vacancy on rutile TiO_2 for efficient electron-hole separation and high solar-driven photocatalytic hydrogen evolution

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Science China materials 2018年第6期61卷 822-830页

作者： Fang Xiao1 Wei Zhou2 Bojing sun2 Haoze li2 Panzhe Qiao2 liping Ren2 Xiaojun zhao1 Honggang Fu2 Tianjin key laboratory of Structure and Performance for functional Molecules Key Laboratory of Inorganic-Organic Hybrid Functional Materials Chemistry (Tianjin Normal University) Ministry of Education of China College of chemistry Tianjin Normal University key laboratory of functional inorganic material chemistry Ministry of Education of China Heilongjiang University

Oxygen vacancy（VO） plays a vital role in semiconductor photocatalysis. Rutile TiO2 nanomaterials with controllable contents of VO（0–2.18%） are fabricated via an insitu solid-state chemical reduction strategy, with color from white to black. The bandgap of the resultant rutile TiO2 is reduced from 3.0 to 2.56 e V, indicating the enhanced visible light absorption. The resultant rutile TiO2 with optimal contents of VO（2.07%） exhibits a high solar-driven photocatalytic hydrogen production rate of 734 μmol h-1, which is about four times as high as that of the pristine one（185 μmol h-1）. The presence of VOelevates the apparent Fermi level of rutile TiO2 and promotes the efficient electronhole separation obviously, which favor the escape of photogenerated electrons and prolong the life-time（7.6×103 ns） of photogenerated charge carriers, confirmed by scanning Kelvin probe microscopy, surface photovoltage spectroscopy and transient-state fluorescence. VO-mediated efficient photogenerated electron-hole separation strategy may provide new insight for fabricating other high-performance semiconductor oxide photocatalysts.

关键词： oxygen vacancy rutile TiO2 surface engineering solar-driven photocatalysis hydrogen evolution

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