物理化学学报 >> 2025, Vol. 41 >> Issue (3): 100024.doi: 10.3866/PKU.WHXB202404012

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碳修饰的铜催化剂实现安培级电流电化学还原CO2制C2+产物

董雪1, 孙晓甫2,*(), 贾帅强1, 韩世涛1, 周达伟1, 姚婷1, 王敏1, 方明慧1, 吴海虹1,*(), 韩布兴1,2,*()   

  1. 1 华东师范大学化学与分子工程学院, 上海市绿色化学与化工过程重点实验室, 上海 200062
    2 中国科学院化学研究所, 北京分子科学国家实验室, 中国科学院胶体、界面与化学热力学重点实验室, 中国科学院分子科学卓越研究/教育中心, 北京 100190
  • 收稿日期:2024-04-08 修回日期:2024-05-07 录用日期:2024-05-07 发布日期:2024-12-14
  • 通讯作者: Email: sunxiaofu@iccas.ac.cn. Tel.: +86-10-62562821 (孙晓甫)hhwu@chem.ecnu.edu.cn (吴海虹)hanbx@iccas.ac.cn (韩布兴)
  • 基金资助:
    国家重点研发计划项目(2023YFA1507901); 国家重点研发计划项目(2020YFA0710201); 国家自然科学基金项目(22293015); 国家自然科学基金项目(22121002)

Electrochemical CO2 Reduction to C2+ Products with Ampere-Level Current on Carbon-Modified Copper Catalysts

Xue Dong1, Xiaofu Sun2,*(), Shuaiqiang Jia1, Shitao Han1, Dawei Zhou1, Ting Yao1, Min Wang1, Minghui Fang1, Haihong Wu1,*(), Buxing Han1,2,*()   

  1. 1 Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200062, China
    2 Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2024-04-08 Revised:2024-05-07 Accepted:2024-05-07 Published:2024-12-14
  • Contact: Email: sunxiaofu@iccas.ac.cn. Tel.: +86-10-62562821 (Xiaofu Sun)hhwu@chem.ecnu.edu.cn (Haihong Wu)hanbx@iccas.ac.cn (Buxing Han)
  • Supported by:
    the National Key Research and Development Program of China(2023YFA1507901); the National Key Research and Development Program of China(2020YFA0710201); National Natural Science Foundation of China(22293015); National Natural Science Foundation of China(22121002)

摘要:

铜基电催化剂在CO2还原反应(CO2RR)中产高附加值产物的潜力巨大,是实现碳负排放的一种很有前景的途径。同时,安培级电流是实现多碳(C2+)产业化的关键。然而,由于复杂的电子传递过程和不可避免的副反应,工业电流密度下的C2+选择性仍然不令人满意。在此,我们开发了一种碳修饰策略来优化局部环境并调节中间产物在Cu活性位点的吸附。结果表明,Cu-Cx催化剂(x为催化剂中C的原子百分数)能有效催化CO2RR生成C2+产物。特别是在流动池中,Cu-C6%在-0.72 V vs. RHE(相对可逆氢电极)条件下,电流密度可达1.25 A∙cm-2, C2H4和C2+产物的法拉第效率(FE)分别可达54.4%和80.2%。原位光谱分析和密度泛函理论(DFT)计算表明,C的存在调节了*CO在Cu表面的吸附,降低了C—C耦合的能垒,从而促进了C2+产物的生成。

关键词: CO2还原, 电催化, 多碳产物, 绿色化学, 安培电流

Abstract:

Copper-based electrocatalysts have great potential to produce high-value products in CO2 reduction reaction (CO2RR), offering a promising way to achieve negative carbon emissions. Additionally, achieving ampere-level currents is crucial for realizing the industrialization of multi-carbon (C2+) products. However, the C2+ selectivity at industrial current densities remains unsatisfactory due to complex electron transport processes and inevitable side reactions. Herein, we developed a carbon-modification strategy aimed at optimizing the local environment and regulating the adsorption of intermediates at Cu active sites. Our findings demonstrated the effectiveness of Cu-Cx catalysts (where 'x' denoted the atomic percentage of C in the catalysts) in facilitating CO2RR for producing C2+ products. Especially, over Cu-C6%, the current density could reach to 1.25 A∙cm-2 at -0.72 V vs. RHE (versus reversible hydrogen electrode) in a flow cell, and the Faradaic efficiency (FE) of C2H4 and C2+ products could reach to 54.4% and 80.2%, respectively. In situ spectral analysis and density functional theory (DFT) calculations showed that the presence of C regulated the adsorption of *CO on Cu surface, reduced the energy barrier of C—C coupling, thus promoting the production of C2+ products.

Key words: CO2 reduction, Electrocatalysis, Multi-carbon products, Green chemistry, Ampere-level current