An active and stable hydrogen electrode of solid oxide cells with exsolved Fe-Co-Ni nanoparticles from Sr_(2)FeCo_(0.2)Ni_(0.2)Mo_(0.6)O_(6-δ)double-perovskite  

作　　者：Cheng Li Yatian Deng Liping Yang Bo Liu Dong Yan Liyuan Fan Jian Li Lichao Jia 

机构地区：[1]School of Materials Science and Engineering,State Key Lab of Material Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China [2]College of Science and Engineering,James Cook University,1 James Cook Drive,Townsville,QLD,4811,Australia

出　　处：《Advanced Powder Materials》2023年第4期46-53,共8页先进粉体材料（英文）

基　　金：supported by the National Natural Science Foundation of China(52072134,U1910209,51972128,52272205);Hubei Province(2021CBA149,2021CFA072,2022BAA087).

摘　　要：Sr_(2)FeCo_(0.2)Ni_(0.2)Mo_(0.6)O_(6-δ)(SFCNM)and Sr_(2)FeNi_(0.4)Mo_(0.6)O_(6-δ)(SFNM)were prepared as the hydrogen electrode materials for solid oxide cells(SOCs)and comparatively investigated by density function theory(DFT)and experiments to demonstrate the benefit of Co addition.The reduced SFCNM(R-SFCNM)and SFNM(R-SFNM)contain exsolved Fe–Co–Ni and Fe–Ni nanoparticles,respectively.DFT indicates that Fe–Co–Ni has optimized combination of the d-band center(descriptor of catalyst activity)and adsorption behavior for H_(2)O,H_(2),H,and OH.The cell with SFCNM hydrogen electrode,La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM)electrolyte,and La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCF)oxygen electrode(Cell-SFCNM)demonstrates a higher performance than that with an SFNM hydrogen electrode(Cell-SFNM)at temperatures between 700 and 850℃in both solid oxide fuel cell(SOFC,3%H_(2)O-97%H_(2)/air)and solid oxide electrolysis cell(SOEC,20%H_(2)O-80%H_(2)/air)modes.At 850 and 700℃,the peak power density is 1.23 and 0.48 W⋅cm^(-2)in SOFC mode,while the current density is 1.25 and 0.37 A⋅cm^(-2)at 1.3 V in SOEC mode,respectively.The performance degradation rates at 750℃are 0.17 mV⋅h^(-1)in SOFC and 0.15 mV⋅h^(-1)in SOEC modes within 150 h,which are improved by Co doping.

关 键 词：PEROVSKITE Ternary alloy Density functional theory Solid oxide cells Steam electrolysis 

分 类 号：TM9[电气工程—电力电子与电力传动]