“…Thus, it is necessary to develop efficient cathode materials that can improve the CO 2 reduction efficiency and reduce the required overpotentials. Several electrodes, such as various metallice lectrodes, [2,4,14,15] metal sulfides, [16,17] metal complexes, [6] and others, [18] have been investigated, and the electrode materiala nd structure affect significantly the CO 2 reduction selectivity and stability. [19,20] Palladiumi so ne of the cathode materials that shows promising catalytic activity towards the electroreduction of CO 2 to CO. [21,22] Bao and co-workersr evealedt hat the size of the Pd nanoparticles plays an important role in the electroreduction efficiency.…”