工业电流密度CO2-到C2+ 通过抗膨胀的离子交换对氧化物衍生的Cu纳米板进行电降解
Yuan Zhao1, Xiaolong Zu1, Runhua Chen1
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.
Journal of the American Chemical Society
|May 31, 2022
概括
研究人员开发了一种抗胀的离子交换离子体 (AEI),以改善二氧化碳 (CO2) 电还原到C2+产品. 这种AEI优化了当地环境,在工业条件下大大提高了C2+的选择性.
科学领域:
- 电化学
- 材料科学
- 催化剂
背景情况:
- 将二氧化碳 (CO2) 电催化转化为高能量密度的C2+产品对于可持续的化学合成至关重要.
- 在工业电流密度下实现高C2+产品的选择性仍然是一个重大挑战.
研究的目的:
- 引入一种抗膨胀的离子交换离子体 (AEI),以优化二氧化碳电还原的局部环境.
- 在工业相关条件下提高CO2转化为C2+的选择性和效率.
主要方法:
- 使用AEI修饰的氧化物衍生的Cu纳米板作为催化剂.
- 使用现场拉曼光谱,接触角度测量和现场里埃变换红外光谱.
- 进行理论计算以了解反应机制和局部环境影响.
主要成果:
- 通过降低关键中间体的能量障碍,AEI有效调节了当地pH和水含量,促进了C2+的产生.
- 优化的水含量 (3.5%) 抑制了的演变,促进了C2+生产的质子电子转移.
- 在800 mA cm-2下达到85.1%的C2+法拉第效率,半电池功率转换效率超过50%.
结论:
- 在高电流密度下,抗膨胀AEI是增强CO2电还原到C2+产品的有希望的策略.
- 开发的催化剂系统在效率和选择性方面优于之前报告的大多数粉末催化剂.
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