在CO2降电过程中确定Cu100/Cu111接口为优质活性位点
Zhi-Zheng Wu1, Xiao-Long Zhang1, Zhuang-Zhuang Niu1
1Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
Journal of the American Chemical Society
|December 28, 2021
概括
研究人员开发出氧化铜结晶,有效地将二氧化碳 (CO2) 转化为有价值的多碳化学物质. 这一突破增强了碳-碳键的形成,
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 二氧化碳 (CO2) 中的多碳化学物质的电合成正在推进,但由于缓慢的碳-碳 (C-C) 键形成动力学,特别是在中性条件下受到阻碍.
- 开发高效的催化剂是克服可持续化工生产这些局限性的关键.
研究的目的:
- 开发一种高效的二氧化碳电降解催化剂.
- 在特定的铜面和接口上研究增强C-C键形成的机制.
主要方法:
- 氧化物衍生铜 (OD-Cu) 结晶的电化学合成和表征,具有定义的面积 ({100}和{111}).
- 在电流密度为300 mA cm-2的KHCO3电解质中进行二氧化碳电减试验.
- 在现场实验和计算研究 (例如,DFT) 了解催化机制.
主要成果:
- 在减少二氧化碳的多碳产物中,OD-Cu晶体达到74.9±1.7%的高法拉代效率.
- 在中性介质 (pH ~ 8.4) 中,催化剂在300 mA cm-2的商业相关电流密度下有效运行.
- 已确定Cu100/Cu111接口可促进CO吸附和降低C-C合能障碍,其性能优于单个Cu100和Cu111表面.
结论:
- 有控制面的氧化铜晶体可以有效地将二氧化碳电还原为多碳化学物质.
- 100) /111) 接口在增强C-C键形成动力学方面发挥着关键作用.
- 开发的催化剂表现出稳定性和高性能,为实际二氧化碳利用铺平了道路.
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