在氧活性共价有机框架上工程-双原子活性站点,以促进整体水分化的共价有机框架
Lei Ran1, Yifan Xu1, Yue Zhang2
1School of Energy and Environment, City University of Hong Kong, Hong Kong, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 8, 2026
概括
这项研究引入了一种新的导电双功能共价有机框架 (COF),具有双-活性位点,用于高效的整体水分裂. 这种先进的电催化剂在和氧进化反应中表现出卓越的性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 导电双功能共价有机框架 (COFs) 对于整体的水分裂至关重要,但由于有限的多功能活性站点而面临挑战.
- 开发高效的电催化剂,具有强大的双功能活性和稳定性,无论是演变反应 (HER) 还是氧演变反应 (OER),对于性水电解是必不可少的.
研究的目的:
- 设计和合成一种基于氧化还原活性COFs的新型 pyrolysis-free电催化剂.
- 将原子分散的 - 双活性位点定在基于供体 - 接受体的COF (Ace和TAPT,IrRu DAS/AT-COF) 上.
- 研究性水电解的催化性能和机制.
主要方法:
- 合成IrRu DAS/AT-COF通过将原子分散的 - 双活性位点定在以供体接受体为基础的氧化还原活性COF上.
- 在1米KOH的电催化测试中,测试演变反应 (HER) 和氧演变反应 (OER).
- 使用操作光谱学和理论计算来阐明催化机制和活性位点相互作用.
主要成果:
- 合成的IrRu DAS/AT-COF在1m KOH中表现出强大的双功能活性和HER和OER的稳定性.
- 性能超过了现有的基准和大多数贵金属基催化剂.
- 操作光谱和理论计算揭示了多位点分离机制和一个巨大的多功能主动位点协同增强 (MASE) 效应.
结论:
- 由Ir和Ru位点之间的分子内部电子调制引发的MASE效应,平衡和加速水电解中的基本步骤.
- 催化剂的导电性得到改善,增强了H2O吸附,降低了H2O解离能障碍,以及最佳的H/O中间体吸附.
- 这项工作为设计高级水电解电催化剂的双功能COF中的多站点催化环境提供了新的见解.
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