通过高指数步骤密度工程控制Cu催化剂对工业相关乙醇电合成的活性和选择性
Yipeng Zang1, Haitao Li2, Yan Sun3
1School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, China.
ACS nano
|March 27, 2025
概括
化学蚀刻铜纳米颗粒创造了一个缺陷丰富的催化剂,具有高指数的步骤位点. 这增强了电化学二氧化碳减少到乙醇,提高了生产率和选择性.
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:
- 用电化学方法将二氧化碳 (CO2RR) 减少为乙醇等多碳产品,在商业上具有重要意义.
- 铜 (Cu) 催化剂是CO2RR的关键,但由于活动-选择性权衡,实现高乙醇选择性和生产率仍然具有挑战性.
研究的目的:
- 开发一个缺陷丰富的铜催化剂,有丰富的高指数步骤站点,以改善CO2RR中的乙醇生产.
- 了解这些特定催化场所在提高乙醇选择性和反应速率方面的作用.
主要方法:
- 商业铜纳米颗粒的化学蚀刻,以创建具有高指数步骤位点的缺陷丰富的表面.
- 电化学评估催化剂对CO2RR的性能,包括法拉第效率和乙醇的部分电流密度.
- 现场拉曼光谱和密度函数理论 (DFT) 计算以探测反应机制和活性位点特征.
主要成果:
- 富有缺陷的Cu催化剂在乙醇生产中实现了高法拉代效率约50%和部分电流密度约416 mA cm-2.
- 催化剂在高总电流密度 (~800 mA cm-2) 中表现出良好的稳定性,具有持续的乙醇选择性.
- 控制实验和理论计算证实,高密度高指数的步骤站点对于提高乙醇选择性至关重要.
结论:
- 在缺陷丰富的Cu催化剂上,优化的高指数步骤站点有效地平衡了关键中间体 (*CO, *OH, *H) 的吸附.
- 这些地点促进化途径到乙醇,显著提高选择性.
- 控制步骤密度是指导CO2RR向高价值乙醇生产的关键策略.
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