Abstract
Bismuth vanadate (BiVO4) has been recognized as a favorable photocatalyst for generating oxygen from water decomposition using solar energy. While, BiVO4’s optical activity is limited due to its low charge mobility, high photo-generated electron hole recombination rate and low infrared light response. Herein, an oxygen vacancy-riched NdVO4/BiVO4 heterojunction with infrared absorption feature is successfully prepared by a two-step cation-exchange method using Na5V12O32 nanowire as a precursor. The in-situ growth of BiVO4 on NdVO4 forms a close contact interface, forming a heterojunction structure and generating an internal electric field, and the oxygen vacancies generated during cation-exchange can serve as electron traps, promoting the separation of photogenerated electron-hole pairs at the heterojunction. Furthermore, the enhanced infrared absorption properties of NdVO4, which forms the heterojunction, broaden the spectral response range. As a result, the synergistic effect of improved heterojunctions due to oxygen vacancies and enhanced infrared absorption, the photocatalyst exhibits enhanced photocatalytic oxygen evolution activity under visible and near-infrared light irradiation, with an oxygen evolution rate of 1543.16 μmol h−1 g−1 under visible light, which is 3 times higher than that of bare BiVO4. Oxygen can be generated even under near-infrared light.
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