在正电荷的Ru-N-Ni双位点上强大的界面结网络促进性电催化
Longyu Qiu1, Fenyang Tian1, Lin He1
1State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Advanced materials (Deerfield Beach, Fla.)
|September 2, 2025
概括
本研究介绍了增强电催化剂的桥式双位点催化剂. 这些催化剂改善了氧化和演化反应 (HOR和HER) 的质量转移和稳定性.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 基于 (Ru) 的双位点催化剂对性电催化有希望.
- 挑战包括不够的质量转移和难以操纵界面水结构.
- 优化反应中间体的吸附对于催化剂的效率至关重要.
研究的目的:
- 为增强氧化和进化反应 (HOR和HER) 开发一种新型催化剂设计.
- 研究界面水结构和结网络在催化剂性能中的作用.
- 在电催化反应中改善质量转移和稳定性.
主要方法:
- 桥式带正电荷的Ru和Ni双位点催化剂 (Ru-Ni3N) 的合成
- 研究水界面定向和键网络的形成.
- 对HOR和HER进行电催化测试,包括质量活动和稳定性测量.
- 分析Ru和Ni站点的电荷传输通道和电子特性.
主要成果:
- Ru-Ni3N催化剂具有有序的水方向,具有有利的"O-down"配置.
- 一个增强的接口键网络促进了质量转移.
- 通过Ru-N-Ni桥梁的有效电荷传递稳定了中间体并改善了抗CO中毒.
- HOR 的质量活性达到了 60.6 A g-1,是基于 Ru 的催化剂中最高的.
- 对离子交换膜水电解剂的低电池电压 (1.79 V 在 1 A cm-2 处) 和长期稳定性 (>550 h 在 500 mA cm-2 处).
结论:
- 开发的桥式双站点催化剂策略有效地增强了性电催化.
- 交界键网络调制是改善质量转移和催化活性的一种可行的方法.
- 这一战略在燃料电池和水电解方面具有很大的应用潜力.
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