催化作用
氯化物
耐久性
质子交换膜燃料电池
吸附
溶解
奥斯特瓦尔德成熟
铂金
材料科学
化学工程
化学
无机化学
纳米技术
冶金
复合材料
物理化学
有机化学
工程类
作者
Chaoyong Sun,Limei Qiu,Shaojie Ke,Jiakun Zhang,Guangtong Xu,Meiling Dou
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-06-03
卷期号:5 (6): 7503-7514
被引量:10
标识
DOI:10.1021/acsaem.2c00991
摘要
The high durability of proton exchange membrane fuel cells (PEMFCs) is crucial for their large-scale application in hydrogen mobility, while a trace amount of chloride in air significantly affects the durability of PEMFCs. Herein, we demonstrate a type of chloride-tolerant PtCo/C catalyst with a Pt3Co-core@Pt-skin structure showing that the chloride adsorption rate decreased by 34% compared with Pt/C. The introduction of Co weakens chloride adsorption on Pt with a decrease of ≥13% in the adsorption energy due to the downshifted Pt d-band center. The durability of PtCo/C outperforms that of Pt/C, exhibiting a stronger resistance toward the coupling effect of dynamic high-potential/chloride poisoning by mitigating Pt dissolution and hindering the Ostwald ripening of Pt nanoparticles. The presence of chloride aggravates the decay of Pt-based catalysts under the simulated potential cycling operation, and the aggravated effect is less severe for PtCo/C with an ∼40% decrease in the decay percentage in comparison to Pt/C after a 10,000-cycle test. This work provides a valuable guide for the design of robust antipoisoning catalysts by adjusting the Pt d-band center for long-life PEMFC application.
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