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脉冲电解转向CO2甲化通过N混杂的铜酸

Wei Hua^1,2, Tingting Liu^1,2, Zhangyi Zheng^1,2

¹Soochow Institute for Energy and Materials Innovations, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, College of Energy, Soochow University, Suzhou, 215006, P. R. China.

Angewandte Chemie (International ed. in English)

|January 30, 2024

概括

脉冲电位电解通过使用N混铜 (II) 四甲 (CuNCP) 催化剂提高了二氧化碳减排中的甲选择性. 这种方法优化了催化剂.

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:

在正方形平面M-N4宏循环中打破D4h对称性会增强电催化活性,但会降低稳定性.
N-混杂铜 (II) 四甲 (CuNCP) 呈现不稳定的Cu-N3活性位点,这给稳定性带来了挑战.

研究的目的:

调查脉冲电位电解 (PPE) 是否可以克服CuNCP活性位点的可变性,以改善电催化二氧化碳的减少.
为了提高二氧化碳电还原过程中的甲选择性和部分电流密度.

主要方法:

使用CuNCP在流动电池中的脉冲电位电解 (PPE) 下进行电催化CO2减排.
使用现场X射线衍射 (XRD),传输电子显微镜 (TEM) 和现场X射线吸收光谱 (XAS),红外 (IR),拉曼和扫描电化学显微镜 (SECM) 的特征.

主要成果:

个人防护设备的应用使CH4的选择性增加了3倍,实现了170mA cm-2的部分电流密度,具有>60%的法拉第效率.
描述揭示了随着时间的推移不可避免的CuNCP解复.
在高阳极偏差和低pH下促进水解离导致CO在减少的Cu纳米颗粒上化,增强CH4的选择性.

结论:

虽然PPE增强了CH4的选择性,但催化剂解复是长期的挑战.
该研究强调了将电解协议适应催化剂结构的重要性,以优化当地化学环境,以有效减少二氧化碳.

关键词:

电催化减少二氧化碳的方法在现场的电化学光谱学.甲化为甲化.N-混的铜四甲氨酸.脉冲电位电解的脉冲电位电解.

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