Abstract
In this study, we report a photoanode consisting of a polymeric/inorganic nanojunction between novel nanostructured 3D C3 N4 nano-networks and BiVO4 substrate. This nanojunction is formed such that 3D C3 N4 nano-networks with a positively charged surface are efficiently anchored on the BiVO4 photoanode with a negatively charged surface. This electrostatic self-assembly can initiate and contribute to an intimate contact at the interfaces, leading to an enhanced photoelectrochemical activity and stability compared with that fabricated by non-electrostatic assembly. The C3 N4 nano-network/BiVO4 photoanode achieved a remarkable photocurrent density of 4.87 mA cm-2 for water oxidation at 1.23 V (vs. reversible hydrogen electrode) after depositing FeOOH/NiOOH as oxygen-evolution co-catalyst, which is among the highest photocurrent densities reported so far for BiVO4 -based photoanodes.
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