识别Fe中的协同作用,协同协调的多聚甲氨酸用于电化学CO的支架2 减少反应2
Zhouxin Wang1, Jun Qian2, Pengcheng Cao3
1National Synchrotron Radiation Laboratory, CAS Center for Excellence in Nanoscience, Free Electron Laser for Innovation Center of Energy Chemistry (FELiChEM), Key Laboratory of Precision and Intelligent Chemistry, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, P. R. China.
Nano letters
|March 13, 2024
概括
这项研究探讨了使用聚甲氨酸分子减少二氧化碳的金属位点协同作用. 由于电子转移和二氧化碳吸附的改善,FeCo-PPc催化剂的性能得到了提高.
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:
- 催化剂中孤立的金属部位可以表现出增强电催化活性的协同相互作用.
- 孤立地点的结构异质性使得对这些协同效应的准确评估变得复杂.
- 电化学二氧化碳减排是可持续能源和化学生产的关键过程.
研究的目的:
- 为了研究不同孤立金属位点 (Fe,Co) 在聚氨酸 (PPc) 分子中的协同效应,用于电化学CO2减排.
- 利用具有精确结构的金属协调PPc作为研究金属站点协同作用的平台.
- 阐明增强催化活性背后的机制.
主要方法:
- 合成金属协调的多聚甲氨酸分子 (Fe-PPc,Co-PPc,FeCo-PPc). 在这种情况下,
- 二氧化碳还原反应 (CO2RR) 的电化学特征.
- 实验和理论计算 (例如,DFT) 以了解电子结构和反应机制.
主要成果:
- 与Fe-PPc和Co-PPc相比,FeCo-PPc在减少二氧化碳方面显著增强了电催化活性.
- 在PPc中Fe和Co位点的共存增强了宏循环的结合效应.
- 这导致金属位点的电子密度增加,改善CO2吸附和*COOH中间体的形成.
结论:
- 在FeCo-PPc中的Fe和Co位点之间的协同作用对降低CO2的高电催化性能至关重要.
- FeCo-PPc在0.9V (vs RHE) 实现了高的CO部分电流密度 (57.4mA/cm2) 和旋转频率 (>49000站点-1小时-1).
- 精确结构的金属协调PPc是研究催化中的协同效应的有效平台.
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