Abstract
Recently, the use of monoclinic bismuth vanadate (BiVO4) as a visible light active catalyst has continued to increase, thus minimizing major issues such as fast recombination, poor carrier mobility, and sluggish oxidation kinetics has become an increasingly crucial issue. Accordingly, we report the fabrication of phase-engineered BiVO4 micro-leaves via the facile hydrothermal route and their utilization in solar-light-driven azo dye degradation and water splitting. Notably, low-temperature calcined BiVO4 micro-leaves exhibited a monoclinic–tetragonal isotype heterostructure crystal system with highly active (110) oxidative facets that significantly improved redox chemistry, whereas exposed (040) facets facilitated charge transport from monoclinic to tetragonal crystallites. Rationally phase-engineered and (110)/(040)-oriented BiVO4 micro-leaves (mt-BiVO4) presented efficient visible-light-assisted dye-degradation efficiencies (~94%) for water treatment with high durability. Moreover, the fabricated samples displayed dominant photochemical oxygen evolution rates of 1509.62 and 1214.04 μmol h–1 g–1 in an aqueous solution of FeCl3 and AgNO3, respectively. Our results suggest that synergistic effects of exposed reactive facets, dual-phase, and morphology engineering boosted the photocatalytic activity in BiVO4 and provided a promising approach for the development of a bifunctional photocatalyst in water treatment and water-splitting devices.
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