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增强的氧降解反应活性和纳米级工作功能的合碳之间的内在关系

Jae Yeong Cheon¹, Jong Hun Kim, Jae Hyung Kim

¹Department of Chemistry and ‡School of Energy and Chemical Engineering and KIER-UNIST Advanced Center for Energy, Ulsan National Institute of Science and Technology , 50 UNIST-gil, Ulsan 689-798, Republic of Korea.

Journal of the American Chemical Society

|June 10, 2014

概括

杂的纳米碳化合物显示出增强的氧降解反应 (ORR) 活性. 这项研究将异原子合纳米碳化合物中优异的ORR性能与其纳米级工作功能的变化联系起来,提供了新的实验见解.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
纳米技术纳米技术

背景情况:

纳米结构的碳材料添加异质原子显示出显著的电催化潜力.
这些材料中增强氧降解反应 (ORR) 活性背后的精确机制尚未完全理解,并且通常基于理论模型.

研究的目的:

实验性地将杂纳米碳素的增强ORR活性与它们的纳米级工作功能相关联.
调查不同异构原子剂 (N,S,O) 对有序半孔碳 (OMC) 的ORR性能的影响.

主要方法:

用 (N),硫 (S) 和氧 (O) 合的一系列有序半孔碳 (OMC) 的合成.
使用电化学技术评估氧降解反应 (ORR) 的电催化活性.
使用凯尔文探针力显微镜 (KPFM) 测量化OMC的纳米级工作函数.

主要成果:

与双和单的OMC相比,三重的N,S,O-OMC显示出更高的ORR活性和四个电子的选择性.
研究人员观察到,异构原子杂的OMCs的测量工作功能与它们的ORR活性和动力学之间存在很强的相关性.
凯尔文探针力显微镜提供了直接的实验证据,将工作功能修改与提高ORR性能联系起来.

结论:

纳米级工作函数是影响ORR对化纳米碳化合物的电催化活性的一个关键因素.
这项研究为理解和设计基于合碳材料的高性能ORR电催化剂提供了新的实验基础.

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