Perovskite for Electrocatalytic Oxygen Evolution at Elevated Temperatures

被引:27
作者
Abdelghafar, Fatma [1 ,2 ]
Xu, Xiaomin [1 ]
Jiang, San Ping [1 ,3 ]
Shao, Zongping [1 ]
机构
[1] Curtin Univ, WA Sch Mines Minerals Energy & Chem Engn WASM MECE, Perth, WA 6102, Australia
[2] Egyptian Petr Res Inst, Dept Evaluat & Anal, Cairo 11727, Egypt
[3] Foshan Xianhu Lab, Adv Energy Sci & Technol Guangdong Lab, Foshan 528216, Peoples R China
基金
澳大利亚研究理事会;
关键词
elevated temperature; lattice oxygen participation; oxygen evolution reaction; perovskite; water splitting; ION DIFFUSION-COEFFICIENTS; WATER OXIDATION; SURFACE; DEPENDENCE; OXIDES; CATALYSIS;
D O I
10.1002/cssc.202301534
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The development of advanced electrolysis technologies such as anion exchange membrane water electrolyzer (AEMWE) is central to the vision of a sustainable energy future. Key to the realization of such AEMWE technology lies in the exploration of low-cost and high-efficient catalysts for facilitating the anodic oxygen evolution reaction (OER). Despite tremendous efforts in the fundamental research, most of today's OER works are conducted under room temperature, which deviates significantly with AEMWE's operating temperature (50-80 degrees C). To bridge this gap, it is highly desirable to obtain insights into the OER catalytic behavior at elevated temperatures. Herein, using the well-known perovskite catalyst Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) as a proof of concept, the effect of temperature on the variation in OER catalytic activity and stability is evaluated. It is found that the BSCF's activity increases with increasing temperature due to enhanced lattice oxygen participation promoting the lattice oxygen-mediated OER process. Further, surface amorphization and cation leaching of BSCF become more pronounced as temperature increases, causing a somewhat attenuated OER stability. These new understandings of the fundamental OER catalysis over perovskite materials at industrial-relevant temperature conditions are expected to have strong implications for the research of OER catalysts to be deployed in practical water electrolyzers. Temperature matters: Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) as a typical perovskite oxide candidate is studied for its electrocatalytic oxygen evolution catalysis at elevated temperatures. Raising the operating temperature leads to enhanced lattice oxygen participation during the oxygen evolution over BSCF, which is responsible for the improved activity as well as the attenuated stability. image
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页数:9
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