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半孔单原子集群Fe-N/C氧化物进化电催化剂用瓶刷块共聚合物模板化快速热化合成

Dipankar Saha¹, Hsin-Jung Yu¹, Jiacheng Wang²

¹Conte Center for Polymer Research, Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

ACS applied materials & interfaces

|March 8, 2024

概括

这项研究引入了新的,地球上丰富的铁--碳电催化剂,用于氧化演化反应 (OER). 这些催化剂具有很高的效率和稳定性,为昂贵的贵金属催化剂提供了具有成本效益的替代品.

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:

当前的氧化演化反应 (OER) 电催化剂通常很昂贵 (例如,IrO2,RuO2) 或遭受高超电位和慢动力学.
对于可再生能源应用中具有成本效益,高性能电催化剂的需求至关重要.

研究的目的:

开发和描述用于氧化演化反应 (OER) 的新型,地球上丰富的铁多碳电催化剂.
研究这些新材料的合成,结构-活性关系和催化性能.
探索这些催化剂的潜力,作为一种可持续的替代品,以贵金属为基础的OER催化剂.

主要方法:

使用瓶刷块共聚合物模板和快速热 (RTA) 合成中孔性铁添加剂碳电催化剂.
使用诸如X射线光电谱学和现场拉曼谱学等技术,对多孔结构,铁集群和Fe-N4活性位点进行表征.
在1M KOH中对OER性能进行电化学评估,包括超电位,Tafel斜率和稳定性.
密度函数理论 (DFT) 计算以阐明催化机制和活性位点.

主要成果:

一个机械稳定的半孔碳矩阵与分散的协调的Fe单个原子集群成功合成.
优化的电催化剂在10mA/cm2时实现了1.48V的低电位 (与RHE相比),Tafel斜率为55mV/十年.
在OER条件下观察到高活性氧化的表面重建,原子集群防止脱金属化.
DFT计算证实了铁环境的催化活性,并重建了氧化氧化物.

结论:

开发的铁多碳电催化剂价格低廉,土壤丰富,并表现出优异的OER性能和稳定性.
独特的中孔结构和Fe-N4位点有助于增强电子转移和质量传输.
这项工作为可再生能源应用的先进单原子电催化剂提供了一个简单快速的合成路线.

关键词:

瓶子刷块共聚合物共聚合物碳碳碳碳碳碳电催化剂是一种电催化剂.在现场进行拉曼光谱学.氧气进化反应反应氧气进化反应快速的热化热化一个单原子的原子.

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