Abstract
Evidence by selected area diffraction patterns shows the successful preparation of large area (cm × cm) MoS2/graphene heterojunctions in coincidence of the MoS2 and graphene hexagons (superlattice). The electrodes of MoS2/graphene in superlattice configuration show improved catalytic activity for H2 and O2 evolution with smaller overpotential of +0.34 V for the overall water splitting when compared with analogous MoS2/graphene heterojunction with random stacking.
Highlights
There is considerable interest in developing noble metal-free electrodes that could efficiently perform water splitting due to the current change from fossil fuels to renewable electricity [1,2,3,4]
It has been reported that MoS2 could be an efficient electrocatalyst for the oxygen evolution reaction (OER) replacing IrO2 and Pt [5,6]
MoS2 shows electrocatalytic activity for hydrogen evolution reaction (HER) [7,8,9] and, it could be an ideal material to perform both redox processes of overall water splitting
Summary
There is considerable interest in developing noble metal-free electrodes that could efficiently perform water splitting due to the current change from fossil fuels to renewable electricity [1,2,3,4] In this context, it has been reported that MoS2 could be an efficient electrocatalyst for the oxygen evolution reaction (OER) replacing IrO2 and Pt [5,6]. Graphene introduces electrical conductivity favouring electron transfer from the catalytic site on MoS2 to the external circuit. For this reason, there has been considerable interest in developing different procedures for the preparation of MoS2/graphene heterojunctions to be used in electrolysis [13,14,15]
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