中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 3 March 2026 |
（a School of Metallurgy and Environment, Central South University, Changsha 410083, China;
b School of New Energy and Mining, Xinjiang University of Technology, Hetian 848000，China）
Abstract:To promote CO2 redox kinetics on the cathode of hybrid sodium-carbon dioxide (Na-CO2) batteries, hollow cubic CuS nanoboxes were encapsulated in polypyrrole and polydopamine by in situ polymerization of pyrrole and dopamine monomers, respectively, and coupled with high-temperature heat treatment to obtain nitrogen-carbon encapsulated CuxS@NCPPy and CuxS@NCPDA catalysts. The results show that the encapsulation of nitrogen-doped carbon not only increases the specific surface area and improves the electron affinity but also promotes the synergistic interaction between the CuS-based active species and the defect carbon, thus providing abundant active sites for CO2 conversion. The electrochemical performances of the carbon-coated modified samples were all improved, especially the hybrid Na-CO2 battery based on CuxS@NCPPy, which showed a low voltage gap of 0.74 V at 0.1 mA/cm2 and a high power density of 3.42 mW/cm2.
Key words: CO2 reutilization; copper (I) sulfide catalyst; nitrogen-doped carbon; high power density; Na-CO2 batteries
