在TiN-TiO2接口上的双向电子继电器使高潜能氧化催化剂的氧化抗Ru成为可能
Xuejin Li1, Yanfu Tong1, Weiyue Luo1
1State Key Laboratory of Heavy Oil Processing, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P.R. China.
催化剂用于性氧化反应 (HOR) 是通过一种新的TiN-TiO2电子中继机制稳定. 这种方法可以防止在高电位下失效,保持100%的活性,并保存金属Ru.
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:
- 基于 (Ru) 的催化剂对于性氧化反应 (HOR) 是必不可少的,因为它们是 (Pt) 的经济有效替代品.
- 对于Ru催化剂来说,一个主要的挑战是在0.2V以上的电位下不可逆转的失活,而不是RHE,这是由Ru氧化和 (OHad) 过度吸附引起的.
研究的目的:
- 为性HOR开发一种稳定且高度活性的基于Ru的催化剂.
- 为了克服Ru HOR催化剂的内在活动稳定性权衡.
- 为易氧化电催化剂建立一个新的设计范式.
主要方法:
- 开发一个TiN-TiO2异相分离电子继电系统.
- 实施一个以太子为灵感的机制来平衡双向电子流.
- 催化剂性能和稳定性在高电位运行下 (高达1.1V与RHE) 的表征.
主要成果:
- Ru/TiN-TiO2催化剂在1.1V与RHE时表现出完全的活性保留 (100%),与Ru/TiN不同,Ru/TiN在1.1V与RHE时失去>60%的活性.
- 电子继电机制有效抑制了Ru氧化和OH过度吸附,在10小时后保留了73.23%的金属Ru.
- 空间分离的活性位点促进了中间体的几何分离,并加速了Volmer动力学.
结论:
- 拟议的动态充电继电接口解决了Ru HOR电催化剂中的活动稳定性困境.
- 这种方法提供了一个通用的设计策略,用于提高易氧化电催化剂的稳定性.
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