Capture of CO₂ during the Electrolysis Process and Its Utilization in Supercapacitor Materials

With climate change and environmental issues, the emissions of CO₂ and its greenhouse effect have become a focal point. At present, the utilization of CO₂ includes its synthesis into chemicals and fuels such as methane, methanol, and CO. CO₂ utilization can be achieved through carbon capture and storage technologies, which involve capturing CO₂ from industrial emissions and storing it to reduce the CO₂ concentration in the atmosphere. However, these CO₂ capture and utilization technologies still face challenges, such as technical immaturity and high costs. One of the CO₂ capture and utilization technologies is the production of energy storage materials. In this study, CO₂ captured by molten salt was used as the carbon source, and TiO₂ nanotube arrays were used as precursors. Titanium carbide nanotube arrays(TiC-NTAs)with high specific surface area and high conductivity were prepared by electrolysis. Afterward, the electrochemical energy storage performance of TiC in different electrolytes was tested. The results show that reducing the ionic radius of the electrolyte is conducive to increasing the area-specific capacitance of the device and that the degradation of the cycle life of the quasi-solid supercapacitor may be caused by an increase in the internal resistance due to the loss of water from the electrolyte. This study provides a reference value for the low-temperature synthesis of nanometal carbides and the selection of electrolytes.