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金属Ru―Ru 相互作用在氧化中,使长久的质子交换膜水电解成为可能

Guoqiang Zhao¹, Wei Guo¹, Minmin Shan²

¹School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058, P. R. China.

Advanced materials (Deerfield Beach, Fla.)

|May 2, 2024

概括

一种新的金属二氧化 (m-RuO2) 催化剂增强了在质子交换膜水电解 (PEMWE) 中氧化演化反应 (OER) 的稳定性. 金属Ru-Ru相互作用提高了耐用性,并保持了高活性,克服了RuO2溶解问题.

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:

为氧化演化反应 (OER) 开发高效和稳定的电催化剂对于质子交换膜水电解 (PEMWE) 至关重要.
二氧化卢 (RuO2) 呈现出高的OER活性,但由于溶解,其电化学稳定性较差.
缓解RuO2溶解是实现实用的PEMWE强大的OER电催化剂的关键.

研究的目的:

在PEMWE开发一个稳定的基于RuO2的OER电催化剂.
研究金属Ru-Ru相互作用在增强RuO2.2的稳定性和活性方面的作用.
了解Ru-Ru相互作用提高电化学耐用性的机制.

主要方法:

合成了一种具有金属Ru-Ru相互作用 (m-RuO2) 的独特RuO2催化剂.
在实用的PEMWE设置中,对m-RuO2进行电化学测试,在60°C和1A cm-2.2的温度下进行100小时的电化学测试.
实验和理论研究 (例如,DFT计算) 以阐明Ru-Ru相互作用对OER机制和稳定性的作用.

主要成果:

m-RuO2催化剂表现出了显著的稳定性,在苛刻的PEMWE条件下保持100小时的性能.
发现Ru-Ru相互作用显著增加了形成关键溶解中间体 (RuO2(OH) 2的能量屏障.
催化剂表现出下移的Ru 4d频段中心,确保高的OER活动,并抑制了Ru-Ru地点的晶格氧气参与,进一步提高了耐用性.

结论:

金属Ru-Ru相互作用是提高PEMWE中OER的RuO2电化学稳定的高效策略.
金属Ru-Ru星团的大小影响了溶解的能量屏障,凸显了当地协调的重要性.
这项工作为设计基于RuO2的强大的电催化剂提供了可行的途径,用于高性能水电解.

关键词:

电催化剂是一种电催化剂.氧气进化反应反应氧气进化反应质子交换膜水电解水的电解.鲁的溶解方式氧化鲁的氧化物

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