 This paper reports a new method for producing single-phase cobalt carbide, CO2C, nanoparticles at high temperatures and pressures. The resulting material has similar properties to those of platinum group metal catalysts, making it suitable for applications such as CO2 hydrogenation, antibacterial therapy, interfacial water evaporation, electrochemical hydrogen evolution reactions, and batteries. This article was authored by Jinyi Yang, Tingting Zhao, Xu Yanhao, and others.