通过分子捕捉效应提高CO耐受性:单原子Pt在Mo2C上,用于高效的性氧化反应
Xiaokun Yang1, Wenjie Yu1, Yanfeng Zhang2
1Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China.
Journal of colloid and interface science
|April 3, 2025
概括
在Mo2C纳米颗粒上的原子分散 (PtSA/Mo2C-NC) 为燃料电池提供了卓越的氧化反应 (HOR) 性能和CO耐受性. 这种新的催化剂设计提高了效率和稳定性,克服了燃料电池技术的关键挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 开发高效,稳定和耐CO电催化剂对于质子/离子交换膜燃料电池至关重要.
- 氧化反应 (HOR) 催化剂面临的挑战是效率和CO中毒.
研究的目的:
- 提出一种新型的电催化剂,原子分散的在Mo2C纳米颗粒上,支持添加碳 (PtSA/Mo2C-NC),具有黄皮结构.
- 为了评估它的效率,稳定性和对HOR的CO耐受性.
主要方法:
- 合成具有独特黄结构的PtSA/Mo2C-NC催化剂.
- 对HOR性能和CO耐受性的电化学测试.
- 密度函数理论 (DFT) 计算,以了解电子相互作用和吸附能量.
主要成果:
- PtSA/Mo2C-NC表现出高HOR性能,交换电流密度为2.7 mA cm-2和质量活性为2.15 A/mgPt.
- 与商业Pt/C相比,催化剂在H2/1,000 ppm CO下显示出更高的CO容忍度.
- DFT的计算揭示了Pt和Mo2C之间强烈的电子相互作用,优化了H和OH吸附,并使Mo2C能够捕获CO.
结论:
- 由于强大的金属支电子相互作用,PtSA/Mo2C-NC催化剂表现出增强的活性,稳定性和CO耐受性.
- 这种黄皮结构的催化剂为开发先进的燃料电池电催化剂提供了新的策略.
- 二氧化碳成分有效地保护Pt活性部位免受CO中毒.
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