在ZIF-67中原子分散的Ru作为高性能HER催化剂:in situ结构演变和失活机制阐明
Zhe Liu1,2, Rui Jin2, Gui Zhao3
1Institute of Neuroscience, Translational Medicine Institute, Health Science Center, Xi'an Jiaotong University, Xi'an, 710061, China.
Materials horizons
|September 4, 2025
概括
单原子工程解锁了原始的化物化基 (ZIF-67) 催化剂, 然而,在操作过程中,电化学重建会导致由于相隔离而导致性能降低.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- 对于演化反应 (HER) 催化,化伊米达酸框架 (ZIF),特别是ZIF-67得到了广泛的研究.
- 原始ZIF-67对HER的内在催化活性因其惰性性而受到限制.
- 加入贵金属是一种提高MOF催化剂性能的常见策略.
研究的目的:
- 在ZIF-67中开发一种无化方法来植入单原子贵金属 (Ru,Rh,Pd).
- 研究单原子修饰对ZIF-67的HER活性的影响.
- 在HER条件下阐明改性ZIF-67的电化学重建机制.
主要方法:
- 在ZIF-67中无化单原子植入Ru,Rh和Pd.
- 演化反应 (HER) 的催化剂的电化学表征.
- 操作研究和理论计算以探测反应机制.
主要成果:
- 单原子修改显著降低了ZIF-67/CC的HER超电位252mV,并降低了Tafel斜率70%.
- 观察到电化学重建,涉及ZIF-67骨崩成Co ((OH)) 2和Ru聚合成纳米粒子.
- 这种相位分离导致过度吸附和性能降低.
结论:
- 单原子工程是一个有效的策略来激活原始金属有机框架 (MOF) 的潜伏催化特性.
- 了解电化学重建和相分离对于设计基于MOF的稳定电催化剂至关重要.
- 该研究揭示了ZIF-67在阴极条件下的动态行为,突出了长期HER应用的局限性.
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