催化作用
阳极
质子交换膜燃料电池
阴极
氢
化学工程
材料科学
纳米颗粒
氧气
无机化学
化学
电极
纳米技术
物理化学
有机化学
工程类
作者
Björn Marcel Stühmeier,Sören Selve,Mrinali Patel,Timon N. Geppert,Hubert A. Gasteiger,Hany A. El‐Sayed
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2019-08-05
卷期号:2 (8): 5534-5539
被引量:36
标识
DOI:10.1021/acsaem.9b00718
摘要
Reducing the cathode degradation in proton exchange membrane fuel cells during start-up and shut-down events (where the anode is filled with H2 and air) is crucial for its widespread automotive implementation. The use of selective catalysts for the hydrogen oxidation reaction (HOR) that sparingly reduce oxygen on the anode could significantly reduce the carbon corrosion on the cathode. Herein, we report a novel system of carbon supported Pt/TiOx catalysts that combines the unique properties of a strong metal–support interaction (SMSI) with the known advantages of a carbon support. High-resolution transmission electron microscopy of the selective catalyst shows the encapsulation of the Pt nanoparticles (NPs) by a TiOx layer resulting from the SMSI. Rotating disk electrode experiments confirmed that Pt oxidation and oxygen reduction are hindered due to the TiOx layer. Furthermore, a high HOR activity that is retained even at high potentials proved the superior HOR selectivity of the catalyst.
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