Enhanced hydrogen generation at designed heterojunctions of Cu2ZnSnS4-rGO-MoS2 through interface engineering. (29th November 2019) - Mohanapriya, N.
Abstract: Here, we are reporting interface engineering to create designed heterojunctions in Cu2 ZnSnS4 -rGO-MoS2 (CZTS-reduced graphene oxide-MoS2 ), in which abundant high density of nanoscale interfacial contacts are formed. It has been achieved via two-step optimized electrodeposition approach. Further, as-prepared materials have been characterized by microscopic, spectroscopic and electroanalytical techniques. Finally, the concept of generation of designed heterojunctions and synergetic effect were tested for electrocatalytic and photoelectrocatalytic hydrogen generation. The electron-hole pair recombination has been reduced, since the fast transport of photoexcited electrons of CZTS to MoS2 through reduced graphene oxide interfacial contacts. Further, the synergetic effect of increased charge separation between rGO and more catalytically active sites from MoS2 has been attributed to enhanced hydrogen generation. Highlights: The designed heterojunctions in Cu2 ZnSnS4 -rGO-MoS2 were synthesized via two-step optimized electrodeposition approach. The excellent stability has been demonstrated. The efficient hydrogen evolution reaction is due to designed heterojunctions and synergetic effect. The as-prepared material having great potential for electrocatalytic and photoelectrocatalytic applications.