Abstract
Bismuth vanadate (BiVO4) has attracted much attention in photocatalytic oxygen evolution due to its chemical stability and environmental friendliness. However, its photocatalytic activity is limited by lower visible light responsiveness and oxidative capacity, which is related to the energy band structure. Here, we solve this problem by successfully preparing monoclinic BiVO4 nanomaterials with different band gap structures. The primary step of this innovative approach involves solely adjusting the pH using NH3‧H2O in the hydrothermal method. Although the reaction process is simple, it’s very effective in regulating the energy band structure, leading to an extension of the light response range and an enhancement of oxidizing capacity in the photocatalytic oxygen evolution process. As the results, the optimal oxygen evolution rate under visible light could reach 757.62 μmol h−1 g−1 with FeCl3 as the sacrificial agent. Finally, the mechanism of photocatalytic oxygen evolution based on the pH regulation effect on the energy band structure was investigated. This study holds significant importance for enhancing the efficiency of BiVO4 materials in practical applications.
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