异原子剂克服了RuO2中的活性-稳定性权衡,以获得酸性氧的演变
Wei Zheng1, Yang Zhao2, Kang Jiang3
1College of Materials Science and Engineering, State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, Hunan, China.
Nature communications
|July 21, 2025
概括
这项研究引入了Ta和B联合合的纳米孔状RuO2,增强了氧气演化反应的活性和稳定性. 这一突破为水电解应用提供了一个有希望的替代电催化剂.
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:
- 二氧化卢 (RuO2) 是一种有希望的氧化物演化反应 (OER) 的电催化剂,但在酸性介质中实现高活性和稳定性仍然是一个挑战.
- 传统的策略往往导致催化活性和长期耐用性之间的权衡.
- 二氧化 (IrO2) 是基准,但稀缺和昂贵,推动了寻找替代品.
研究的目的:
- 开发一种基于RuO2的高活性和稳定的电催化剂,用于氧气演化反应.
- 为了克服RuO2催化剂固有的活动稳定性权衡.
- 为了研究 (Ta) 和 (B) 联合兴奋剂对RuO2纳米结构的协同效应.
主要方法:
- 合成纳米多孔RuO2与Ta和B (Ta/B-RuO2) 联合合.
- 材料结构的表征,包括Ru-O-Ta框架和Ru-O-B活性位点.
- 对催化剂在氧化演化反应中的性能进行电化学评估,包括超电位,Tafel斜率和耐久性测试.
- 在质子交换膜水电解器中进行测试.
主要成果:
- 成功构建了Ta和B联合合的纳米孔状RuO2,具有独特的Ru-O-Ta框架和Ru-O-B活性位点.
- 通过弥合氧气和补充氧气空缺,Ru-O-Ta框架提高了稳定性.
- Ta/B-RuO2催化剂表现出较低的超电位 (170 mV 在10 mA cm-2),有利的Tafel斜率 (44 mV dec-1),以及出色的耐用性.
- 带有Ta/B-RuO2的质子交换膜水电解器在1.6V时达到1.0A cm-2并保持在200mA cm-2下120小时稳定运行.
结论:
- 塔和B联合剂有效地解决了RuO2在氧气演化反应中的活性稳定性权衡.
- 开发的Ta/B-RuO2催化剂表现出卓越的性能和耐用性,使其成为IrO2.2的可行替代品.
- 这项工作为设计用于高效水分的先进电催化剂提供了新的策略.
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