Coke formation during high-temperature CO2 electrolysis over AFeO3 (A = La/Sr) cathode: Effect of A-site metal segregation

被引：71

作者：

Deka, Dhruba J. ^{[1
]}

Kim, Jaesung ^{[1
]}

Gunduz, Seval ^{[1
]}

Jain, Deeksha ^{[1
]}

Shi, Yingjie ^{[1
]}

Miller, Jeffrey T. ^{[2
]}

Co, Anne C. ^{[3
]}

Ozkan, Umit S. ^{[1
]}

机构：

[1] Ohio State Univ, William G Lowrie Dept Chem & Biomol Engn, Columbus, OH 43210 USA

[2] Purdue Univ, Davidson Sch Chem Engn, 480 Stadium Mall Dr, W Lafayette, IN 47907 USA

[3] Ohio State Univ, Dept Chem & Biochem, Columbus, OH 43210 USA

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2021年 / 283卷

基金：

美国国家科学基金会;

关键词：

CO2; electrolysis; Strontium-doped lanthanum ferrite perovskites; Coke formation; CARBON-DIOXIDE ELECTROLYSIS; DOPED PEROVSKITE CATHODE; SURFACE-PROPERTIES; REDUCTION; OXIDES; NANOPARTICLES; COMPOSITE; CATALYST; CELL; H2O;

D O I：

10.1016/j.apcatb.2020.119642

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, strontium-doped lanthanum ferrite perovskite oxides (LSF) with different A-site occupancies were used as cathode catalysts for CO2 electrolysis at 800 degrees C. XRD, EXAFS, XPS, FTIR, and temperature-programmed desorption were used to characterize the properties of the material. Fe K-edge EXAFS indicated that oxygen vacancy concentration and oxidation states of Fe atoms increased with concomitant improvement of electronic and ionic conductivities with a decrease in the A-site occupancy. XPS spectra revealed that Sr atoms segregated on the surface of A-site excess LSF92 to a greater degree than that on the A-site deficient LSF72. These segregated A-site metal oxides, especially SrO, are alkaline in nature and hence strongly bind to acidic CO2 forming stable SrCO3, which consequently facilitates carbon formation. This study highlights the effect of A-site stoichiometric modulation on carbon formation during electrolysis of CO2, which is crucial for improving the long- term performance of an SOEC.

引用

页数：12

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