调节Cu二原子距离 在CO2电还原过程中促进碳-碳合
Hongxin Guan1, Yuxiang Zhang1, Wenjun Fan2
1MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 4, 2024
概括
本研究介绍了一种离子导向的策略,通过优化二氧化铜催化剂来增强电化学二氧化碳减排 (eCO2RR) 到多碳产品. -BIF/Cl催化剂实现了高效率和C2+生产的电流密度.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 用电化学方法将二氧化碳 (eCO2RR) 减少为多碳 (C2+) 产品至关重要,但受到碳-碳合瓶的阻碍.
- 优化金属催化剂的原子间距离是提高反应效率的关键.
研究的目的:
- 开发一种以离子为导向的策略,以调节铜 (Cu) 体的原子间距离,以提高eCO2RR.
- 为了研究离子修饰的Cu催化剂的催化性能和机制.
主要方法:
- 用不同的离子 (Cl-,NO3-,SO42-) 修改的Cu-boroimidazole框架 (BIF) 的合成.
- 电化学表征包括法拉第效率和电流密度测量.
- 理论计算和实地实验调查以了解催化机制.
主要成果:
- 阳离子修饰延长了Cu-Cu原子间距离,Cu-BIF/Cl的距离为3.30 Å.
- -BIF/Cl在C2+产品中实现了72.12%的高法拉第效率,在-1.75V时的电流密度为539.0mA cm-2.
- 发现电子阴性Cl-离子通过提升Cu d频段中心来促进CO吸附和二元化.
结论:
- 阳离子导向策略有效调节二原子催化剂中的原子间距离,以改善eCO2RR.
- -BIF/Cl在C2+生产方面表现出卓越的性能,为CO2利用提供了一个有前途的途径.
- 这种策略可以适应其他涉及中间合的反应,例如碳-和-合.
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