Advances and challenges of electrolyzers for large-scale CO2 electroreduction

CO 2 electroreduction Large-scale CO 2 electrolyzer Flow channel Gas diffusion electrode Ion exchange membrane A B S T R A C T CO 2 electroreduction (CO 2 ER) to high value-added chemicals is considered as a promising technology to achieve sustainable carbon neutralization.By virtue of the progressive research in recent years aiming at design and understanding of catalytic materials and electrolyte systems, the CO 2 ER performance (such as current density, selectivity, stability, CO 2 conversion, etc.) has been continually increased.Unfortunately, there has been relatively little attention paid to the large-scale CO 2 electrolyzers, which stand just as one obstacle, alongside series-parallel integration, challenging the practical application of this infant technology.In this review, the latest progress on the structures of low-temperature CO 2 electrolyzers and scale-up studies was systematically overviewed.The influence of the CO 2 electrolyzer configurations, such as the flow channel design, gas diffusion electrode (GDE) and ion exchange membrane (IEM), on the CO 2 ER performance was further discussed.The review could provide inspiration for the design of large-scale CO 2 electrolyzers so as to accelerate the industrial application of CO 2 ER technology.