在高效电催化剂的黄金量子点上固定高度分散的原子
Lan Hui1,2, Xueting Zhang1,2, Yurui Xue1
1Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China.
Journal of the American Chemical Society
|January 19, 2022
概括
研究人员开发了一种新型的电催化剂, 这种催化剂显著提高了甲醇和乙醇氧化反应的燃料电池性能,提供了更高的活性和耐用性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 商业燃料电池需要高效且耐用的电催化剂.
- 开发先进的催化剂对于燃料电池的广泛采用至关重要.
研究的目的:
- 为燃料电池应用合成具有增强活性和稳定的新型电催化剂.
- 研究特定结构修改对催化性能的影响.
主要方法:
- 在多孔石墨烯 (PtCl2Au(111) /GDY上使用原子分散的物种的黄金量子点的表轴生长.
- 量子点大小 (2.37 nm) 和催化剂结构的表征.
- 对甲醇氧化反应 (MOR) 和乙醇氧化反应 (EOR) 的电化学测试.
- 理论计算以阐明催化机制.
主要成果:
- 获得高质量活性:MORs为175.64A mgPt-1,EORs为165.35A mgPt-1.
- 与商业Pt/C相比,表现显著更高 (85.67倍的MOR,246.80倍的EOR).
- 在110小时后,MOR的稳定性很强,衰变程度微不足道.
- 确定了Pt d带结构的修饰和CO通路抑制作为关键因素.
结论:
- PtCl2Au(111) /GDY催化剂为燃料电池反应提供了特殊的活性和稳定性.
- 原子分散金属物种的定制,特别是修饰,是设计先进电催化剂的有希望的策略.
- 这种方法为有效和持久的催化剂开发开辟了新的途径.
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