封闭在缺陷丰富的NiCoO2中的贵金属具有促进性电催化氧演变的协同效应
Yixue Xu1, Fan Qiu2, Shifan Zhu1
1Research Center for Nano Photoelectrochemistry and Devices, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189 China; Yangtze River Delta Carbon Neutrality Strategy Development Institute, Southeast University, Nanjing 210096 China.
Journal of colloid and interface science
|February 6, 2025
概括
一个新的氧气空隙封闭策略增强了贵金属催化剂的水分裂. 这种方法通过防止金属聚合来改善催化活性和稳定性,为催化剂设计提供了通用方法.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 电化学 电化学 电化学
背景情况:
- 在水分裂反应中实现高催化活性和经济可行性,需要低贵金属负载和高分散.
- 在反应期间的贵金属聚合物对催化剂的稳定性和性能构成重大挑战.
研究的目的:
- 开发一种新的氧气空隙封闭策略,以提高贵金属催化剂的活性和稳定性.
- 研究氧气空缺在防止贵金属聚合和提高催化性能方面的作用.
主要方法:
- 有缺陷的M/NiCoO2 (M = Ru, Pd, Pt, Ag) 催化剂的合成,具有不同的贵金属负载.
- 使用像DFT计算这样的技术来描述催化剂结构,分散和电子特性.
- 电化学测试用于评估水分裂反应中的催化活性和稳定性.
主要成果:
- 在NiCoO2中存在的氧气空隙促进了电子移位,增强了导电性,促进了贵金属的分散,并防止了聚合.
- 混合M/NiCoO2-x催化剂表现出优越的催化活性 (例如,Ru/NiCoO2-x在235mV) 和稳定性 (超过100小时的98%保留率) 与非受限的同行相比.
- 受氧空缺所限制的贵金属原子变得缺乏电子,加强与中间体的结合,并减少氧气演化反应的能量屏障.
结论:
- 氧空隙封闭策略为设计高活性和稳定的贵金属催化剂提供了一种一般方法.
- 这种方法有效地平衡了催化活动和水分应用的经济效益.
- 增强的电子移位和金属空隙相互作用是改善催化剂性能和耐用性的关键.
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