通过铜单原子电催化剂将二氧化碳高度选择性地转化为甲
Yixian Liu1, Mengling Zhang1,2, Kaili Bao2
1Macao Institute of Materials Science and Engineering (MIMSE), MUST-SUDA Joint Research Center for Advanced Functional Materials, Macau University of Science and Technology, Taipa, Macao SAR, 999078, China.
ChemSusChem
|September 6, 2024
概括
这项研究在碳基板上引入了一种新型的铜单原子催化剂 (Cu-SAC),用于高效的二氧化碳 (CO2) 到甲 (CH4) 的电催化降解. 催化剂具有很高的选择性和稳定性,为温室气体减排和能源生产提供了有前途的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 环境科学 环境科学
背景情况:
- 电催化二氧化碳减排 (CO2RR) 对于解决温室效应和能源危机至关重要.
- 需要高效的催化剂来克服高价值化学品生产所需的八个电子转移的缓慢动力学.
- 单原子催化剂 (SAC) 具有很高的活性和选择性,在异质催化中代表了一个前沿.
研究的目的:
- 开发一种高效的催化剂,用于高选择性地将二氧化碳电催化降解为甲 (CH4).
- 为了研究单个铜原子在碳基板 (Cu-NC) 上加载的性能和稳定性.
主要方法:
- 一个Cu-NC催化剂与原子分散的Cu-N3位点的合成.
- 电催化二氧化碳减排实验以确定法拉第效率 (FE) 和产品选择性.
- 使用HAADF-STEM和XANES进行表征,以确认催化剂结构.
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- 最佳的Cu-NC-1-4催化剂在一个广泛的潜在窗口 (-1.3到-1.8V与RHE) 中实现了超过50%的CH4法拉代效率 (FE).
- 对CH4的最高FE达到67.22%在-1.6V (与RHE相比),CH4在碳产品中的选择性为93.00%.
- 催化剂在70小时的稳定性测试中显示了微不足道的活性衰变.
- DFT的计算证实,Cu-N3位点有效吸附*CO中间体,促进CH4的产生.
结论:
- -NC-1-4是电催化二氧化碳转化为CH4的高度选择性和稳定的催化剂.
- 原子分散的Cu-N3位点是催化剂高性能的关键.
- 这项工作为利用二氧化碳作为碳源用于有价值的化学生产提供了有希望的途径.
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