金属间化合物
合金
催化作用
化学
退火(玻璃)
化学计量学
氧还原反应
燃料电池
化学工程
多孔性
纳米技术
冶金
材料科学
物理化学
电化学
电极
有机化学
工程类
作者
Wei-Jie Zeng,Chang Wang,Pengfei Yin,Lei Tong,Qiangqiang Yan,Ming‐Xi Chen,Shilong Xu,Hai‐Wei Liang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2023-03-22
卷期号:62 (13): 5262-5269
被引量:5
标识
DOI:10.1021/acs.inorgchem.3c00331
摘要
Porous carbon-supported atomically ordered intermetallic compounds (IMCs) are promising electrocatalysts in boosting oxygen reduction reaction (ORR) for fuel cell applications. However, the formation mechanism of IMC structures under high temperatures is poorly understood, which hampers the synthesis of highly ordered IMC catalysts with promoted ORR performance. Here, we employ high-temperature X-ray diffraction and energy-dispersive spectroscopic elemental mapping techniques to study the formation process of IMCs, by taking PtCo for example, in an industry-relevant impregnation synthesis. We find that high-temperature annealing is crucial in promoting the formation of alloy particles with a stoichiometric Co/Pt ratio, which in turn is the precondition for transforming the disordered alloys to ordered intermetallic structures at a relatively low temperature. Based on the findings, we accordingly synthesize highly ordered L10-type PtCo catalysts with a remarkable ORR performance in fuel cells.
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