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超微型高合金纳米颗粒用于极高的电催化进化

Guang Feng¹, Fanghua Ning¹, Jin Song¹

¹Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, P. R. China.

Journal of the American Chemical Society

|September 23, 2021

概括

超小的高合金纳米粒子 (us-HEAs) 在酸性介质中表现出优异的演变反应 (HER). 这些新型催化剂表现出增强的活性和稳定性,为先进的能源应用铺平了道路.

科学领域:

材料科学
电化学
纳米技术

背景情况:

开发高效的催化剂用于电催化生产,特别是在酸性环境中,仍然是一个重大挑战.
高合金 (HEAs) 由于其独特的多元素组成和可调节性质而具有潜力.

研究的目的:

报告超小的高合金 (us-HEA) 纳米粒子,其演变反应 (HER) 的性能非常出色.
阐明这些新型HEA催化剂的结构,电子和催化机制.

主要方法:

高合金 (NiCoFePtRh) 纳米粒子 (NP) 的合成,平均直径为1.68nm.
原子,协调和电子结构的特征.
在0.5M H2SO4中对HER进行电催化测试.
进行X射线吸收光谱和理论计算.

主要成果:

美国HEA/C催化剂在HER的0.05V下达到28.3A mg^-1_贵金属的记录质量活性,显著超过商业Pt/C和Rh/C.
在50mV的超电位下显示了30.1s-1的超高转变频率,比Pt/C高41.8倍.
经过1万个循环后没有表现衰退的优秀稳定性.
运行光谱和计算确定了活性点,可调节的电子结构和协同效应.

结论:

超小的高合金纳米粒子代表了高效的演化反应的催化剂类.
开发的合成策略和机械洞察力加速了高温电池在能源转换技术中的应用.
这项工作突显了HEAs在先进的催化应用中的潜力,特别是在酸性介质中.

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