在RuO2上进行氧化离子工程,用于高效的质子交换膜水电解
Ying Duan1, Lin-Lin Wang1, Wen-Xing Zheng1
1MOE International Joint Laboratory of Materials Microstructure, Institute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, 300384, Tianjin, China.
Angewandte Chemie (International ed. in English)
|August 12, 2024
概括
二氧化 (RuO2) 催化剂对酸性水的电解有前途,但缺乏稳定性. 这项研究引入了硫酸盐定RuO2/MoO3催化剂,显著改善了在质子交换膜水电解 (PEMWE) 中氧化演化反应 (OER) 的性能和耐久性.
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:
- 酸性质子交换膜水电解 (PEMWE) 需要高效和稳定的阳极氧演化反应 (OER) 催化剂.
- 基于的催化剂是有效的,但昂贵和稀缺.
- 二氧化卢 (RuO2) 的成本较低,活性较高,但在酸性介质中稳定性较差.
研究的目的:
- 开发一种基于RuO2的稳定和活性催化剂,用于酸性OER.
- 通过离子修饰来提高RuO2催化剂的耐用性.
- 研究改善催化剂稳定性和活性背后的机制.
主要方法:
- 使用硫酸盐在RuO2/MoO3.3上的离子修饰策略.
- 电化学表征包括10 mA cm-2.2 的超电位测量.
- 在酸性电解质和PEMWE电池中进行长期稳定性测试.
- 实验和理论分析以阐明稳定机制.
主要成果:
- 硫酸盐结的RuO2/MoO3催化剂在10 mA cm-2.2时实现了190 mV的低超电位.
- 证明了特殊的稳定性,在酸性电解质中运行500小时,降解率为20μV h-1 .
- 催化剂在PEMWE电池中表现出极好的耐用性,在500 mA cm-2下运行150小时.
- 在RuO2表面上,MoO3稳定了硫酸盐离子,抑制了漏,减少了中间形成能量.
结论:
- 在RuO2/MoO3上定硫酸盐的阳离子修饰有效地提高了OER在酸性介质中的活性和稳定性.
- 3-硫酸盐相互作用稳定了RuO2,防止了表面和晶格氧气损失,从而带来了优越的耐用性.
- 这种方法为高效且持久的PEMWE系统提供了对基催化剂的有希望的替代方案.
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