调整过渡金属3d旋转状态对单原子催化剂的选择性电化学CO2 减少减少
Yipeng Zang1, Yan Liu2, Ruihu Lu2
1Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Republic of Singapore.
Advanced materials (Deerfield Beach, Fla.)
|March 13, 2025
概括
将添加到单原子催化剂 (SAC) 中可以调整过渡金属 (如铁) 的自旋状态. 这种旋转状态调整显著提高了电化学二氧化碳 (CO2R) 到一氧化碳 (CO) 的减少.
科学领域:
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 控制过渡金属的旋转状态是增强电催化剂活性的一个有希望的策略.
- 电化学二氧化碳减排 (CO2R) 催化剂中调整自旋状态的合理设计原则尚未得到充分确立.
研究的目的:
- 研究 (P) 兴奋剂对铁磁单原子催化剂 (SACs) (Fe,Co,Ni) 旋转状态的影响.
- 阐明旋转状态操纵与CO2R性能之间的关系.
- 通过控制的旋转状态调整来证明一种通过控制的旋转状态调整来提高CO2R活动的方法.
主要方法:
- 合成P-doped铁磁性SACs (Fe,Co,Ni) 的合成.
- 使用X射线吸收光谱 (XAS),电子自旋共振 (ESR) 光谱和超导量子干扰装置 (SQUID) 测量进行了表征.
- 电化学 CO2R 性能评估.
- 密度函数理论 (DFT) 的计算.
主要成果:
- 兴奋剂成功地将Fe SAC的旋转状态从低旋转 (Fe-N4) 转变为高旋转 (Fe-N3-P).
- Fe-N3-P SAC实现了超过90%的法拉第效率,用于生产CO,其部分电流密度高,约为600mA cm-2.
- DFT的计算表明,高旋转的Fe3+状态增强了电子回捐,通过改进的*COOH吸附促进了CO2R.
结论:
- 通过P兴奋剂故意调整SAC的旋转状态是提高CO2R性能的有效策略.
- 在Fe-N3-P SAC中Fe3+的高旋转状态有助于有效地将CO2减少到CO.
- 这项工作为开发用于二氧化碳转换的先进电催化剂提供了设计原则.
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