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在CNT@MO_2- (M = Sn和Ce) 异质接口上调整Pt物种的局部环境,以促进性的进化

Chang-An Zhou¹, Kui Ma¹, Zechao Zhuang²

¹Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.

Journal of the American Chemical Society

|July 25, 2024

概括

开发基进化反应的先进基金属 (PGM) 电催化剂至关重要. 这项研究引入了与碳纳米管上的金属氧化物接口集成的新型PtRu双金属集群,显著增强了HER动力学并减少了性介质中的过量.

科学领域:

电化学
材料科学
催化剂

背景情况:

基于 (Pt) 的催化剂对进化反应 (HER) 是有前途的,但由于动力学缓慢和成本高,在性介质中面临挑战.
优化Pt物种的局部环境和利用金属氧化物异面接口可以加速性HER.

研究的目的:

通过优化Pt物种和金属氧化物异质接口的本地环境,开发一种高效的化物演化电催化剂.
研究PtRu双金属集群和MO2- (M = Sn,Ce) 对碳纳米管的协同效应,以提高HER性能.

主要方法:

在碳纳米管上 (PtRu/CNT@MO2-) 合成与MO2- (M = Sn,Ce) 邻近的分散的PtRu双金属集群.
在 1 M KOH 中进行电化学表征,以评估 HER 的性能,包括过度潜能,质量活性和特异性活性.
实验和理论研究 (例如,DFT计算) 以了解异质接口的反应机制.

主要成果:

PtRu/CNT@MO2-电催化剂在1M KOH中表现出75mV的低过电位.
在70mV的超电位下获得了优异的质量活性 (12.3mA μg-1Pt+Ru) 和特异性活性 (32.0mA cm-2ECSA),显著超过商业Pt/C.
发现Pt集群和MO2-之间的异构接口促进了H2O吸附和激活,而Ru修饰则优化了H吸附和H2O解离障碍.

结论:

设计的PtRu/CNT@MO2-电催化剂通过优化局部催化环境,为高效的性HER提供了一个有希望的途径.
在金属氧化物异构接口和双金属组成的协同效应加速关键的基本步骤,从而产生出色的气.
这项工作为设计先进的电催化剂提供了宝贵的见解,通过定制本地环境以提高性溶液中的HER性能.

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