在Pd金属上原子分散的CrOX,用于耐CO氧化甲醇氧化
Yu Qiu1, Jinchang Fan1, Jiandong Wu1,2
1State Key Laboratory of Automotive Simulation and Control, School of Materials Science and Engineering, Key Laboratory of Automobile Materials of MOE, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.
在上原子分散的氧化增强了甲醇氧化反应的电催化剂. 这种新的催化剂设计克服了CO中毒,提高了直接甲醇燃料电池的性能和耐用性.
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:
- 直接甲醇燃料电池 (DMFC) 需要高效的电催化剂来进行甲醇氧化反应 (MOR).
- 活性部位的一氧化碳 (CO) 中毒限制了当前MOR电催化剂的耐用性,例如碳 (Pd/C) 上的.
研究的目的:
- 开发一种具有增强MOR活性和耐久性的新型电催化剂.
- 在一个新的催化剂系统中研究CO耐受性和提高性能的机制.
主要方法:
- 通过桥梁氧原子在 (Pd) 金属支上固定的原子分散的氧化 (CrOX) 物种的合成.
- 对MOR性能 CrOX-Pd催化剂的电化学表征.
- 运行电化学里埃转换红外光谱学 (O-EFITR) 来研究二氧化碳去除动态.
- 理论计算 (密度函数理论) 以阐明催化机制.
主要成果:
- 与商业Pd/C相比,CrOX-Pd催化剂对MOR的质量活性是商业Pd/C的7倍.
- 催化剂显示了100mV低的CO电氧化潜力,表明了更好的CO耐受性.
- O-EFITR证实了从催化剂表面快速去除吸附的CO (CO*).
- 理论计算显示,CrOX降低了Pd上的CO*吸附,并通过键增强了基 (OH*) 吸附,促进了COOH*的形成.
结论:
- 在Pd金属上原子分散的CrOX是开发持久且活跃的MOR电催化剂的高效策略.
- 工程化氧化物/金属接口在缓解CO中毒和增强催化活性方面发挥着至关重要的作用.
- 这种方法为设计用于直接甲醇燃料电池的先进电催化剂提供了新的途径.
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