在原子分散的异核双原子催化剂上,将CO2转化为CO的高效电还原打破缩放关系
Song Lu1, Michal Mazur2, Kun Guo3
1Department of Energy and Petroleum Engineering, University of Stavanger, Stavanger, 4036, Norway.
Small (Weinheim an der Bergstrasse, Germany)
|November 10, 2023
概括
这项研究引入了一种新型的Mn-Ni双原子催化剂,用于有效地将二氧化碳 (CO2) 电催化转化为有价值的产品. 催化剂打破了传统的缩放关系,实现了CO生产的高选择性.
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:
- 二氧化碳 (CO2) 的电催化转化对于减轻能源和环境问题至关重要.
- 二氧化碳电还原 (ECR) 的效率通常受到中间吸附强度之间的缩放关系的限制.
- 开发先进的催化剂对于克服这些局限性至关重要.
研究的目的:
- 合成和研究用于二氧化碳电还原的新型单原子和双原子催化剂 (DAC).
- 探索基于Mn和Ni的催化剂的催化活性,包括异质核DAC.
- 了解最有前途的催化剂的电子结构和催化机制.
主要方法:
- 合成Mn和Ni的单原子催化剂,同核DAC和异核DAC.
- 偏差校正环状暗场扫描传输电子显微镜 (ADF-STEM) 用于结构特征.
- 用于电子结构分析的X射线吸收光谱 (XAS),X射线光电子光谱 (XPS) 和X射线吸收近边光谱 (XANES).
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- 成功合成了Mn-Ni异核DAC,其中包括一个Mn-Ni对.
- 鉴定证实了Mn-Ni DAC中的Mn到Ni原子的电子捐赠.
- 在Mn-Ni DAC实现高CO法拉代克效率98.7%在-0.7V与RHE相比.
- 使用Mn-Ni DAC.获得了16.8 mA cm-2的CO部分电流密度.
- DFT计算显示,Mn-Ni DAC打破了中间结合能量的缩放关系.
结论:
- -双原子催化剂在电催化降低二氧化碳到二氧化碳方面表现出卓越的性能.
- 打破中间约束能量的缩放关系是提高催化效率的关键.
- 这项工作为开发高度选择性和高效的二氧化碳电还原催化剂提供了有希望的途径.
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