水氧化策略使Ru-Mn氧化物能够在1A cm-2以下进行稳定的质子交换膜水电解
Susu Zhao1, Qian Dang2, Aiqing Cao1
1State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
ACS nano
|February 24, 2025
概括
这项研究引入了一种新的配氧化催化剂 (H-Mn0.1Ru0.9O2) 用于水电解. 催化剂表现出极好的稳定性和性能,解决了目前基于的催化剂的局限性.
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
- 催化剂是一种催化剂.
背景情况:
- 基于 (Ru) 的催化剂是 (Ir) 的经济有效替代品,用于质子交换膜水电解 (PEMWE).
- 在酸氧演化反应 (OER) 中的二氧化 (RuO2) 稳定性问题限制了实际应用,特别是在高电流密度下.
- 开发稳定和活跃的基于Ru的OER催化剂对于推进PEMWE技术至关重要.
研究的目的:
- 合成和表征一种新型的配氧化催化剂 (H-Mn0.1Ru0.9O2) 与酸性OER的基化位点.
- 在酸性介质中评估H-Mn0.1Ru0.9O2的催化活性和长期稳定性.
- 研究OER机制以及兴奋剂和基化在提高催化剂性能和稳定性方面的作用.
主要方法:
- 合成含的氧化与氧化位 (H-Mn0.1Ru0.9O2) 的合成.
- 电化学表征,包括在特定电流密度下进行超电位测量.
- 在酸性电解质和质子交换膜水电解装置 (PEMWE) 中进行长期稳定性测试.
- 使用微分电化学质谱法 (DEMS) 和理论计算阐明机制.
主要成果:
- 对于酸性OER,H-Mn0.1Ru0.9O2在10 mA cm-2时表现出169 mV的低超电位.
- 催化剂表现出了显著的稳定性,在酸性电解质中运行超过1000小时,在PEMWE设备中降解率低,在1A cm-2.
- 使用H-Mn0.1Ru0.9O2的PEMWE设备在大约1.65V时实现了1A cm-2的电流密度.
结论:
- 合成的H-Mn0.1Ru0.9O2催化剂为酸性OER和PEMWE的基催化剂提供了一个有希望的,稳定的和活跃的替代品.
- 氧化和兴奋剂协同增强Ru位点和晶格氧的稳定性,使吸附物演化机制 (AEM) 成为可能.
- 这项工作为开发可靠的基于Ru的电催化剂提供了一条途径,用于高效的水分应用.
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