关键词: Electrochemical devices, High temperature, CO₂ reduction, Co-conversion, Dry reforming of methane, CO₂ hydrogenation

Abstract: The adverse effects of global warming and climate change have driven the exploration of feasible routes for CO₂ capture, storage, conversion and utilization. The processes related to CO₂ conversion in high-temperature electrochemical devices (HTEDs) using dense ceramic membranes are particularly appealing due to the simultaneous realization of highly efficient CO₂ conversion and value-added chemical production as well as the generation of electricity and storage of renewable energy in some cases. Currently, most studies are focused on the two processes, CO₂ electrolysis and H₂O/CO₂ co-electrolysis in oxygen-conducting solid oxide electrolysis cell (O-SOEC) reactors. Less attention has been paid to other meaningful CO₂-conversion-related processes in HTEDs and systematic summary and analysis are currently not available. This review will fill the gap and classify the CO₂-conversion-related processes in HTEDs reported in recent years into four types according to the related reactions, including assisted CO₂ reduction to CO, H₂O and CO₂ co-conversion, dry reforming of methane and CO₂ hydrogenation. Firstly, an overview of the fundamentals of HTED processes is presented, and then the related mechanism and research progress of each type of reactions in different HTEDs are elucidated and concluded accordingly. The remaining major technical issues are also briefly introduced. Lastly, the main challenges and feasible solutions as well as the future prospects of HTEDs for CO₂-conversion-related processes are also discussed in this review.

Key words: Electrochemical devices, High temperature, CO₂ reduction, Co-conversion, Dry reforming of methane, CO₂ hydrogenation