稳定且具有氧化电荷的Ru增强了二维-氧化物中的酸氧演化反应活性
Wenxiang Zhu1, Xiangcong Song1, Fan Liao1
1Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, China.
Nature communications
|September 4, 2023
概括
氧化物催化剂在酸性条件下表现出增强的氧化演化反应活性. 的加入使在高氧化状态下稳定,提高了储能装置的性能.
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:
- 氧气演变反应 (OER) 对于在酸性介质中运行的储能装置至关重要.
- 基于- (Ru-Ir) 的催化剂对OER有希望,但需要稳定,高氧化状态的.
- 为了实现Ru-Ir催化剂的高活性和稳定性,需要了解Ru物种的电子和结构性质.
研究的目的:
- 研究二维氧化物在增强OER活性和稳定性方面的作用.
- 探索Ru-Ir氧化物矩阵内的稳定,氧化充电的位的形成.
- 阐明结合对中心稳定性的结合的结构性益处.
主要方法:
- 合成二维的Ru-Ir氧化物催化剂.
- 电化学表征,包括超电位和周转频率测量.
- 脉冲电压诱导电流方法来探测活动部位的行为.
- 射线吸收光谱 (XAS) 用于分析局部结构和氧化状态.
主要成果:
- Ru0.5Ir0.5O2催化剂具有较高的OER活性,具有较低的超电位 (151 mV在10 mA cm-2) 和高的旋转频率 (6.84 s-1在1.44 V与RHE).
- 催化剂表现出卓越的运行稳定性,持续618.3小时.
- 的结合促进了在较低的应用电压下在高氧化状态下形成更多的活性位.
- XAS数据揭示了Ru0.5Ir0.5O2固体溶液中的Ru-O-Ir局部结构,增强了中心的稳定性.
结论:
- 二维Ru-Ir氧化物,特别是Ru0.5Ir0.5O2,显著提高氧气演化反应活性和稳定性在酸性介质.
- 性能改善归因于鲁在高氧化状态中的稳定,易于通过合和独特的Ru-O-Ir局部结构来实现.
- 这种催化剂设计为基于酸的储能应用中高效和耐用的电催化剂提供了有前途的途径.
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