BiVO₄ has attracted widespread attention as a promising semiconductor material for recent year. However, poor water oxidation kinetics and severe surface charge recombination are still the bottlenecks, which significantly hinders the practical solar-to-hydrogen conversion. In this work, we successfully decorated iron-borate (FeBi) co-catalyst on the surface of electrochemical treated-BiVO₄ (E-BVO, via 10 s), and the obtained FeBi/E-BiVO₄ heterostructure drastically enhances the PEC water splitting performance. The optimal sample exhibits an excellent photocurrent density of 3.24 mA/cm² at 1.23 V_RHE, a 600% increase over the pristine BiVO₄ (0.46 mA/cm²). The applied bias photo-to-current efficiency (ABPE) has been increased up to 1.35%, since FeBi co-catalyst and E-BVO contributes to expose more active sites and offer rich oxygen vacancies, respectively, which efficiently boosted the charges transfer and separation efficiencies. Therefore, this work will provide an alternative route to realize the efficient solar-to-hydrogen conversion.

近年来，BiVO ₄作为一种有前途的半导体材料已经引起了广泛的关注。然而，不良的水氧化动力学和严重的表面电荷复合仍然是瓶颈，这严重阻碍了实际的太阳能转化为氢。在这项工作中，我们成功地在电化学处理过的BiVO ₄（E-BVO，经过10 s）的表面上装饰了硼酸铁（FeBi）助催化剂，并且获得的FeBi / E-BiVO ₄异质结构极大地增强了PEC水分割效果。最佳样品在1.23 V _RHE下表现出出色的光电流密度3.24 mA / cm ²，比原始BiVO ₄（0.46 mA / cm ^2）提高了600％）。施加的偏置光电流效率（ABPE）已提高到1.35％，这是因为FeBi助催化剂和E-BVO分别有助于暴露更多的活性位点并提供丰富的氧空位，从而有效地促进了电荷转移和分离效率。因此，这项工作将为实现有效的太阳能到氢的转化提供替代途径。