Abstract
An unique graphene hybridized 2D ternary GR/(001)/(100)WO3 facet junction is designed by combining the advantages of heterojunction and unique bi-functional graphene working as hole trap and co-catalyst in photocatalytic water splitting. By a facile two-step hydrothermal method, (001)WO3 with highly exposed facet is connected to graphene through -C-W-“bridge”, while (100)WO3 grows on the surface of (001)WO3 affording efficient generation of photocharges. GR/(001)/(100)WO3 is highly active in oxidation of water, with an apparent quantum efficiency of 26.7 % at 420 nm. The -C-W- “bridge” acts as electron transfer channel for construction of internal electric field at GR/(001)WO3 interface, which would direct photo-generated holes towards graphene for water oxidation. The charges dynamics analysis and theoretical simulations demonstrate that the superior photocatalytic activity mainly results from the synergistic promoting effects of the improved separation and prolonged lifetime of photocharges, the reduced energy barrier for OO formation, and the lower overpotential of water oxidation reaction comparable to the most efficient RuO2. This work provides a promising pathway to develop graphene hybridizing structure with dual functions for boosting photocatalytic reactions.
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