Understanding the electrocatalytic mechanism of self-template formation of hierarchical Co9S8/Ni3S2heterojunctions for highly selective electroreduction of nitrobenzene

Electrons transfer from Ni 3 S 2 to Co 9 S 8 in Co 9 S 8 /Ni 3 S 2 heterojunctions through their interface, which is favourable for the adsorption of H 2 O and nitrobenzene onto Co sites for the formation of H* and further protonation of nitrobenzene.