氧降解反应的工程分子异构催化剂
Chang Chen1,2, Yifan Li2,3, Aijian Huang1,4
1Engineering Research Center of Advanced Rare Earth Materials, Department of Chemistry, Tsinghua University, Beijing 100084, China.
这项研究引入了一种新的无热解方法,用于在金属碳催化剂中创建二原子位点 (DAS),特别是FeCo分子异构结构 (FeCo-MHs). 这些FeCo-MH显示了燃料电池和电池的异常氧降解反应活性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 具有二原子位点 (DAS) 的原子分散金属碳 (M-N-C) 催化剂增强了活性和稳定性.
- 传统的DAS合成热解方法缺乏控制和精确的识别.
- 在区分真实的DAS和虚假配置方面存在挑战.
研究的目的:
- 开发一种可靠的,无热解的二原子站点 (DAS) 构建策略.
- 合成和描述FeCo"分子异构结构" (FeCo-MHs) 作为一种新的DAS催化剂.
- 阐明FeCo-MHs在氧降解反应中的结构活性关系.
主要方法:
- 使用两步特定吸附策略,避免高温热解.
- 使用现场旋转传输电子显微镜精确识别单个FeCo-MHs.
- 对氧减少反应 (ORR) 的电化学性能进行了评估.
主要成果:
- 通过控制的二原子位点成功合成FeCo-MH.
- 使用现场旋转TEM证实了FeCo-MH的结构,排除了假阳性.
- FeCo-MHs表现出调制的磁矩和低旋转的Fe ((II) -N4部分的比率增加.
- 实现了0.95V的半波电位 (E1/2) 的异常ORR活动.
结论:
- 没有热解的特异吸附策略是有效的,用于制造明确的DAS催化剂.
- FeCo-MHs是高效氧降解反应的有希望的催化剂类.
- 开发的催化剂显示了燃料电池和空气电池中高性能阴极的潜力.
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