在燃料电池性能方面,表面离子促进具有高CO耐受性的Pt电催化剂
Han Cheng1, Jun Xia2, Minghao Wang1
1School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
Journal of the American Chemical Society
|November 23, 2022
概括
纳米颗粒上的表面离子显著提高燃料电池电催化剂的CO耐受性. 改性 (P-Pt) 显示了超过10倍的改进,使得质子交换膜燃料电池 (PEMFC) 的性能强.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- (Pt) 是燃料电池中的关键电催化剂,但受到CO中毒的影响.
- 对于质子交换膜燃料电池 (PEMFCs) 的实际应用,尤其是燃料中的残留CO,CO容忍度至关重要.
研究的目的:
- 为燃料电池应用开发基于Pt的电催化剂.
- 研究表面离子在Pt电催化剂中提高CO耐受性的机制.
主要方法:
- 通过包括非金属元素在内的表面离子对Pt纳米粒子进行修改.
- 在CO中毒环境中对修改的Pt催化剂进行电化学试验 (半细胞和全细胞).
- 提出了一种涉及表面离子电子反的一般机制,以向下移动 Pt d 波段中心.
主要成果:
- 与商业Pt/C相比,表面改性Pt (P-Pt) 的耐氧性提高了10倍以上.
- 在CO中毒条件下,P-Pt的性能降低很小 (8.4%).
- 在半个和全个燃料电池试验中表现出强大的电催化性能.
结论:
- 表面离子,特别是,可以显著提高Pt电催化剂的CO耐受性.
- 这种机制涉及来自离子的电子反,削弱了Pt表面的CO吸附.
- 这种方法为实用的PEMFC提供了强大的高性能Pt电催化剂的途径.
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