不对称地协调的Cu双原子位点使选择性CO2电还原到乙醇成为可能
Changli Chen1, Zhiyi Sun2, Gangzhi Qin1
1School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|October 7, 2024
概括
研究人员开发了一种新的催化剂,用于电化学降低二氧化碳 (CO2RR) 到乙醇. 这种催化剂具有很高的选择性和效率,为碳中和燃料生产提供了一个有前途的途径.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 电化学减少二氧化碳 (CO2RR) 对于碳中和回收至关重要,特别是生产C2+液体燃料.
- 由于复杂的多电子质子转移过程,控制CO2RR的选择性仍然是一个重大挑战.
研究的目的:
- 合成和优化Cu原子分散催化剂,以提高CO2RR选择性.
- 通过使用一种新的催化剂设计,研究高乙醇选择性背后的机制.
主要方法:
- 一系列Cu原子分散催化剂的合成,具有多种协调结构.
- 在H-Cell和Flow-Cell配置中的电化学测试.
- 在现场实验和理论计算以阐明反应机制.
主要成果:
- 具有不对称CuN2-CuNS位点的Cu2-SNC催化剂实现了高乙醇选择性 (62.6%FE在-0.8V的H电池中,60.2%FE在0.9V的流电池中).
- Cu2-SNC的巢状结构改善了质量转移和产品选择性.
- 发现硫原子削弱了Cu-碳的结合,促进了乙醇形成的途径.
结论:
- 不对称地协调的单原子,双原子或三原子催化剂的合理设计是CO2RR的一个有希望的策略.
- Cu2-SNC是有效和选择性CO2RR以乙醇的候选材料.
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