原子分散的诱导的Ru-V双活性位点使酸性水氧化具有特殊的性能
Qing Qin1, Zijian Li2, Xuhao Zhao1
1College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
Angewandte Chemie (International ed. in English)
|August 26, 2024
概括
包括二元和单个原子在内的原子分散的物种被整合到二氧化卢 (RuO2) 中,以提高其在酸氧演化反应 (OER) 中的性能. 这种策略打破了活动/稳定性权衡,产生了特殊的催化活性和耐用性.
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:
- 二氧化卢 (RuO2) 是氧化演化反应 (OER) 的有前途的催化剂,但受到活动/稳定性权衡的影响.
- 制定克服这一局限性的策略对于高效的电化学水分解至关重要.
研究的目的:
- 为酸性OER设计具有增强活性和稳定的RuO2催化剂.
- 调查原子分散的物种在改变催化途径中的作用.
主要方法:
- 将原子分散的 (V) 物种 (二次体和单个原子) 纳入RuO2网格.
- 电化学表征包括10 mA cm-2.2 的超电位测量.
- 在酸性电解质中进行长期稳定性测试.
- 运行光谱研究和理论计算.
主要成果:
- 使用V-doped RuO2 (Vn-RuO2) 催化剂在10 mA cm-2.2时表现出227 mV的低超电位.
- 催化剂在1050小时的测试中表现出卓越的稳定性.
- 操作研究和计算揭示了一种直接的O-O基合机制,由V二极体促进,绕过*OOH中间体.
- 不对称的Ru-O-V结构稳定了Ru的活性部位,增强了对过度氧化的抵抗力.
结论:
- 原子分散的V物种,特别是V二极体,有效调节酸性OER的催化途径.
- 这种方法成功地打破了RuO2中的活动/稳定性权衡,从而实现了卓越的性能.
- 这些发现提供了通过原子级改造设计高活性和稳定的RuO2基电催化剂的见解.
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