结合点的多样性促进了CO2的电还原到乙醇
Yuguang C Li1, Ziyun Wang1, Tiange Yuan2
1Department of Electrical and Computer Engineering , University of Toronto , 35 St. George Street , Toronto , Ontario M5S 1A4 , Canada.
Journal of the American Chemical Society
|May 10, 2019
概括
研究人员开发了一种新的白银-铜 (Ag/Cu) 催化剂,用于电化学减少二氧化碳 (CO2). 这种催化剂显著提高了乙醇生产的选择性,
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 通过电化学方法减少二氧化碳 (CO2) 对于生产有价值的化学品至关重要.
- 目前的催化剂往往偏爱乙烯而不是乙醇,限制了乙醇的工业可行性.
- 开发用于乙醇生产的选择性催化剂仍然是一个重大挑战.
研究的目的:
- 提高二氧化碳电解中的乙醇选择性.
- 设计一种促进乙醇形成的催化剂.
- 建立用于设计二氧化碳减排的多金属催化剂的框架.
主要方法:
- 开发一种双金属银铜 (Ag/Cu) 催化剂.
- 使用催化剂表面上的多种结合点.
- 在现场拉曼光谱分析催化剂行为.
- 在250mA/cm2和0.67V与RHE的电化学测试.
主要成果:
- 在乙醇生产方面实现了41%的法拉达效率.
- 在阴极侧的能量效率达到了24.7%.
- 观察到在现场扩大了拉曼光谱,表明各种结合配置.
结论:
- 在Ag/Cu催化剂上的多种结合点会破坏乙烯中间体的稳定,促进乙醇的产生.
- 双金属催化剂的设计为高度选择性的乙醇合成提供了一个有前途的途径.
- 多站点结合为设计二氧化碳电降低的先进催化剂提供了框架.
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