Manipulating Nb-doped SrFeO_(3−δ)with excellent performance for proton-conducting solid oxide fuel cells  

作　　者：Hailu Dai Hongzhe Du Samir Boulfrad Shoufu Yu Lei Bi Qinfang Zhang 

机构地区：[1]School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China [2]College of Science&Engineering,Hamad Bin Khalifa University,Doha 34110,Qatar [3]School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China

出　　处：《Journal of Advanced Ceramics》2024年第5期579-589,共11页先进陶瓷（英文）

基　　金：the National Natural Science Foundation of China(Nos.52302314 and 12274361).

摘　　要：Nb-doped SrFeO_(3−δ)(SFO)is used as a cathode in proton-conducting solid oxide fuel cells(H-SOFCs).First-principles calculations show that the SrFe0.9Nb0.1O_(3−δ)(SFNO)cathode has a lower energy barrier in the cathode reaction for H-SOFCs than the Nb-free SrFeO_(3−δ)cathode.Subsequent experimental studies show that Nb doping substantially enhances the performance of the SrFeO_(3−δ)cathode.Then,oxygen vacancies(VO)were introduced into SFNO using the microwave sintering method,further improving the performance of the SFNO cathode.The mechanism behind the performance improvement owing to VO was revealed using first-principles calculations,with further optimization of the SFNO cathode achieved by developing a suitable wet chemical synthesis route to prepare nanosized SFNO materials.This method significantly reduces the grain size of SFNO compared with the conventional solid-state reaction method,although the solid-state reaction method is generally used for preparing Nb-containing oxides.As a result of defect engineering and synthesis approaches,the SFNO cathode achieved an attractive fuel cell performance,attaining an output of 1764 mW·cm−2 at 700℃ and operating for more than 200 h.The manipulation of Nb-doped SrFeO_(3−δ)can be seen as a“one stone,two birds”strategy,enhancing cathode performance while retaining good stability,thus providing an interesting approach for constructing high-performance cathodes for H-SOFCs.

关 键 词：SrFeO_(3−δ)-(SFO) CATHODE proton conductor solid oxide fuel cells(SOFCs) 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TQ174.1[化学工程—陶瓷工业]