Asymmetrically coordinated single atom Cu catalyst with unsaturated C-Cu-N structure for CO2 reduction to CO

作者：Zheng Liu, Yuxuan Liu, Jingqiao Zhang, Ting Cao, Zhiyi Sun, Juzhe Liu, Huishan Shang · 发表于：Nano Research · 年份：2024 · DOI：10.1007/s12274-023-6386-3 · 被引用次数：48 · 研究领域：CO2 Reduction Techniques and Catalysts、MXene and MAX Phase Materials、Electrocatalysts for Energy Conversion

Single atom catalysts (SACs) play a crucial role in energy catalysis due to their distinct coordination environment and high atomic utilization efficiency. This study focuses on the synthesis of a monatomic Cu catalyst with Cu-N 1 C 1 coordination anchored to N-doped Ti 3 C 2 T x MXene (Cu SA@N-Ti 3 C 2 T x ) to achieve efficient reduction of CO 2 to CO. Detailed characterization, including morphology and multispectral analysis, confirmed the uniform distribution of asymmetrically coordinated Cu atoms in unsaturated C-Cu-N bridge fragments on Ti 3 C 2 T x . The Cu SA@N-Ti 3 C 2 T x catalyst exhibited an excellent CO selectivity with Faraday efficiency of 97.4% at −0.58 V vs. reversible hydrogen electrode (RHE) and satisfactory durability. The in situ X-ray absorption fine structure (XAFS) results confirmed that the carbon dioxide reduction reaction (CO 2 RR) product distribution is mainly affected by potential-dependent valence change of Cu species. These findings highlight the extensive potential of tuning coordination structure of MXene-based single-atom catalysts for CO 2 reduction reactions.