Perovskite Chromates Cathode with Exsolved Iron Nanoparticles for Direct High-Temperature Steam Electrolysis

被引:53
作者
Li, Yuanxin [1 ]
Wang, Yan [1 ]
Doherty, Winston [3 ]
Xie, Kui [1 ,2 ]
Wu, Yucheng [1 ,2 ]
机构
[1] Hefei Univ Technol, Sch Mat Sci & Engn, Dept Energy Mat, Hefei 230009, Anhui, Peoples R China
[2] Hefei Univ Technol, Sch Mat Sci & Engn, Key Lab Adv Funct Mat & Devices, Hefei 230009, Anhui, Peoples R China
[3] Monash Univ, Sch Appl Sci & Engn, Churchill, Vic 3842, Australia
关键词
solid oxide electrolyzer; iron nanoparticles; conductivity; doped lanthanum chromates; steam electrolysis; SOLID OXIDE ELECTROLYZER; HYDROGEN-PRODUCTION; CO2; PERFORMANCE; TRANSPORT; CELLS; FILM; MN; FE; TI;
D O I
10.1021/am4020132
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Recently, composite cathodes based on doped lanthanum chrornates have been widely employed for direct steam electrolysis. However, this approach limits the electrode performances and Faraday efficiency due to insufficient electrocatalytic activity. This study addresses the drawbacks and reports an improved electrocatalytic activity and Faraday efficiency of composite cathode with a reversibly exsolved iron nanoparticles anchored on the surface of doped lanthanum chromates. A-site deficient and B-site excess (La0.75Sr0.25)(0.85)(Cr0.5Fe0.5)(0.85)Fe0.15O3-delta (LSCrFF) was designed as the parent material to anchor the exsolved iron nanoparticles on the surface of perovskite chromate (La0.75Sr0.25)(Cr0.5Fe0.5)O-3.delta (LSCrF) via high-temperature reduction. The electrical properties of LSCrF and Fe/LSCrF were systematically investigated and correlated with electrochemical performance of the composite electrodes in symmetrical cells and electrolysis cells. The iron nanoparticles significantly improve the electrical conductivity of LSCrF from 1.80 to 6.35 S cm(-1) for Fe/LSCrF at 800 degrees C and Po-2 of 10(-15) atm. The polarization resistance, R-p, of the symmetrical cells was accordingly enhanced from 4.26 Omega cm(2) with LSCrF to 2.58 Omega cm(2) with Fe/LSCrF in hydrogen atmosphere at 800 C. The Faraday efficiency for the direct steam electrolysis showed a marked increase of 89.3% with LSCrFF cathode at 800 C and 1.8 V as opposed to 76.7% with the cathodes based on LSCrF. The synergetic effect of catalytic-active iron nanoparticles and redox-stable LSCrF substrate produced improved performances and excellent stability for the direct steam electrolysis without a flow of reducing gas over the composite cathodes.
引用
收藏
页码:8553 / 8562
页数:10
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