激活单位电催化剂的动态原子配置在电化学CO2减少中
Chia-Shuo Hsu1, Jiali Wang1, You-Chiuan Chu1
1Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan.
Nature communications
|August 28, 2023
概括
了解动态原子配置是有效的二氧化碳电还原的关键. 这项研究表明,通过原子表面电荷识别的低协调金属中心对于高的二氧化碳转化为二氧化碳的选择性和活性至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 用于二氧化碳电降解 (CO2RR) 的高效电催化剂需要更深入地了解应用潜力下的动态化学状态和原子配置.
- 铜单原子电催化剂作为研究这些复杂进化的模型系统.
研究的目的:
- 阐明二氧化碳电还原过程中动态原子配置,化学状态变化和表面电荷之间的相互作用.
- 确定评估CO2RR性能的关键指标,并发现有效生产CO的活跃地点.
主要方法:
- 利用现场/操作技术的组合来监测二氧化碳电还原过程中的催化剂演变.
- 采用铜单原子电催化剂作为详细分析的模型系统.
主要成果:
- 证明了动态原子配置,化学状态和表面库伦比电荷共同决定了CO2RR中的产品配置.
- 引入了原子表面电荷 (φe) 作为性能指标,并确定了潜在驱动的动态低协调 Cu 中心作为 CO 生产的高度选择性.
- 在结构重建期间观察到Cu-N键断裂和不可逆转的Cu-Cu键形成的部分可逆性.
- 与各种单原子电催化剂 (Cu,Fe,Co) 之间的动态低协调配置相关的高CO生产效率.
结论:
- 动态低协调配置是有效转换CO2到CO的活跃物种.
- 原子表面电荷 (φe) 作为CO2RR性能的通用指标,与这些活性配置的形成有关.
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