摘要
Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3)-δ(BSCF)+Co_(3)O_(4)复合材料作为质子导体固体氧化物燃料电池(H-SOFC)的阴极为在不影响阴极性能的前提下解决阴极与电解质之间热匹配的问题提供了一种新的策略.BSCF是中温氧离子导体SOFC中受到广泛认可的一种阴极材料,但其在H-SOFC中的表现并不突出,其中一个主要的原因是由于BSCF较高的热膨胀系数使其与电解质的接触不好.在本研究中,利用Co_(3)O_(4)熔点较低的特性将BSCF阴极粘结到电解质上,以缓解BSCF与电解质之间接触不好的问题.此外,实验研究和第一性原理计算都证明了Co_(3)O_(4)的添加有效地增强了BSCF阴极的催化活性,从而使该阴极展现出良好的电化学性能以及燃料电池输出性能.
The Ba_(0.5)Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3)-δ(BSCF)+ Co_(3)O_(4)composite material is evaluated as a cathode for proton-conducting solid oxide fuel cells(H-SOFCs),which provides a new strategy to solve the thermal mismatch problem between the cathode and electrolyte without impairing the cathode performance.BSCF is a well-known cathode material for intermediate-temperature SOFCs,but its performance for HSOFCs is unsatisfactory.One reason for the relatively low performance is the poor contact between the BSCF cathode and the electrolyte due to the high thermal expansion of BSCF.The relatively low melting point of Co_(3)O_(4)is taken in this study as an advantage to bond the BSCF cathode to the electrolyte,mitigating the poor contact problem for the BSCF with the electrolyte.Furthermore,the addition of Co_(3)O_(4)promotes the catalytic activity of the BSCF cathode as demonstrated by experimental studies and first-principles calculations,leading to an impressively high performance of BSCF-based cathodes for H-SOFCs.
作者
杨璇
尹燕儒
于守富
毕磊
Xuan Yang;Yanru Yin;Shoufu Yu;Lei Bi(School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China)
基金
supported by the National Natural Science Foundation of China(51972183)
the Hundred Youth Talents Program of Hunan,and the Startup Funding for Talents at the University of South China.
作者简介
Xuan Yang is an undergraduate student in the group of Professor Lei Bi at the University of South China. Her research activities mainly focus on the synthesis and design of new cathode materials for H-SOFCs, revealing the relationship between the structures of materials and their electrochemical performance.These authors contributed equally to this work;Yanru Yin is a staff researcher in the group of Professor Lei Bi at the University of South China. Her research interest is to tailor the structures and properties of proton-conducting oxides, aiming to understand the transportation mechanism of charge carriers in proton-conducting oxides and then boost the performance of H-SOFCs.These authors contributed equally to this work;Corresponding author:Lei Bi is a full professor at the University of South China and leads a research group working on H-SOFCs, using both the first-principles calculation method and experimental approaches. He has been working in the field of H-SOFCs for more than 15 years. His research interests cover the development and optimization of key materials for H-SOFCs and the new technologies for fuel cell fabrications.emails:lei.bi@usc.edu.cn or bilei81@gmail.com。
