在RuO2中锁定晶格氧,以稳定酸性水氧化中的高度活跃的Ru位点
Xinyu Ping1, Yongduo Liu1, Lixia Zheng1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Advanced Chemical Power Sources (SKL-ACPS), Chongqing University, Chongqing, China.
Nature communications
|March 21, 2024
概括
兴奋剂在酸性介质中稳定二氧化卢丁催化剂,用于氧化演化反应 (OER). 这种方法显著减少了催化剂降解,提高了电化学应用的耐用性.
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:
- 二氧化卢 (RuO2) 是酸性环境中氧化演化反应 (OER) 的主要催化剂.
- 然而,由于Ru-O债券的共同价值,Ru的解散限制了其长期稳定性.
- 网格氧化氧化是RuO2催化剂中一个关键的降解途径.
研究的目的:
- 制定一种策略,以稳定RuO2催化剂中的高活性Ru位点.
- 为了抑制晶格氧化氧化,提高催化剂在酸性介质中的耐用性.
- 调查间歇性兴奋剂对RuO2稳定性和OER性能的影响.
主要方法:
- 二氧化的间歇性兴奋剂.
- 在酸性介质中对OER活性和稳定性的电化学测试.
- 微分电化学质谱法 (DEMS) 用于分析降解途径.
主要成果:
- -RuO2-0.1催化剂表现出高OER活性,在10mA cm-2.2时具有226mV的超电位.
- 观察到异常稳定性,在800小时的测试中降解率为~52μVh-1.
- 与商业 RuO2.2 相比,DEMS 显示 ~95% 的晶格氧化氧化途径被抑制.
结论:
- 间歇性兴奋剂有效地稳定了Ru位点,并抑制了RuO2.2中的晶格氧氧化.
- 开发的Si-RuO2-0.1催化剂为OER在酸中提供了卓越的活性和前所未有的稳定性.
- 这种兴奋剂策略为提高基于Ru的氧化物催化剂的耐用性提供了一种新的方法.
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