作为持久酸性水氧化的催化剂的Schottky纳米连接
Yuxiang Song1, Wanghui Zhao1,2, Zhi Wang3
1Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry, School of Science and Research Center for Industries of the Future, Westlake University, Hangzhou 310024, China.
Journal of the American Chemical Society
|April 4, 2025
概括
氧化鲁 (RuO2) 纳米连接在质子交换膜 (PEM) 电解剂中为水氧化提供了稳定且活跃的替代品,克服了以前的耐用性挑战.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 二氧化物 (RuO2) 对水的氧化具有很高的内在活性,使其成为质子交换膜 (PEM) 电解剂中二氧化 (IrO2) 的潜在替代品.
- 然而,由于过度氧化,RuO2催化剂的长期稳定性较差,限制了它们的实际应用.
研究的目的:
- 在PEM电解器中开发一种高活性和稳定的基于Ru的催化剂.
- 研究新型催化剂结构增强稳定的机制.
主要方法:
- 使用微波反应制备4nm以下的Ru-RuO2 Schottky纳米连接 (Ru-RuO2-SN).
- 在三电极系统和PEM电解装置中进行电化学评估.
- 使用密度函数理论 (DFT) 计算的反应机制分析.
主要成果:
- Ru-RuO2-SN催化剂表现出高活性,仅需要165mV的超电位10mA·cm-2,并且具有特殊的长期稳定性 (1400小时) 没有降解.
- 在PEM电解器中,催化剂在1.6V时达到1.0A·cm-2并且在长时间内保持稳定 (1100小时在100 mA·cm-2,100小时在500 mA·cm-2).
- 纳米连接中的晶格应变和电荷转移优化了电子结构,减少了过氧化,并促进了氧化物通路机制 (OPM).
结论:
- 开发的Ru-RuO2-SN催化剂为水氧化提供了耐用且高效的纯Ru替代品,其稳定性与基于的催化剂相匹配.
- 这项工作为设计基于Ru的稳定和活性电催化剂提供了一种新的策略.
- 这些发现为提高效率和成本效益的PEM电解技术铺平了道路.
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