短距离有序Ru原子阵列上的氧基合使酸性水氧化具有特殊的活性和稳定性
Jiangwei Chang1, Yuanyuan Shi1, Han Wu1
1College of Chemistry and Pingyuan Laboratory, Zhengzhou University, Zhengzhou 450000, China.
Journal of the American Chemical Society
|May 2, 2024
概括
为氧化演化反应 (OER) 开发先进的电催化剂是商业化质子交换膜水电解剂的关键. 这项研究引入了新的Ru原子阵列,可在酸性条件下增强OER活性和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 有效和稳定的电催化剂对于质子交换膜水电解剂的商业化至关重要.
- 酸氧演化反应 (OER) 催化剂在活性和稳定性方面面临挑战,特别是基于RuO2的催化剂.
研究的目的:
- 为酸性OER设计和研究新型电催化剂,以克服活性/稳定性权衡.
- 了解基于Ru的催化剂增强性能背后的机制.
主要方法:
- 用受控的Ru-Ru原子间距离合成Ru阵列-Co3O4电催化剂.
- 在酸性介质 (0.5 M H2SO4) 中进行电化学测试,以评估OER的性能和耐用性.
- 用18O标记进行光谱测量和理论计算以阐明反应机制.
主要成果:
- Ru阵列-Co3O4催化剂在10 mA cm-2和1500小时的稳定运行下表现出160 mV的OER过电.
- 短距离的Ru原子阵列可以直接O*-O*激素合,并抑制晶格氧气参与和Ru溶解.
- 运行光谱和理论研究显示由Ru原子阵列驱动的氧化物路径机制 (OPM).
结论:
- 开发的Ru-Array-Co3O4催化剂为酸性OER提供了更高的活性和稳定性,其性能优于传统的RuO2基催化剂.
- 这些发现指导了改进的酸性OER催化剂的设计,并促进了各种应用的短程金属原子阵列电催化剂的开发.
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