We report the fabrication of a novel WO₃ nanorod/graphene/BiV_1−xMo_xO₄ heterojunction photoelectrode for photoelectrochemical (PEC) water splitting. The heterojunction arrays were fabricated via a hydrothermal deposition of WO₃ nanorods on FTO glass, with subsequent depositing of graphene nanosheets and BiV_1−xMo_xO₄ by spin-coating method, respectively. The structure of materials and PEC water splitting properties of the photoelectrodes were systemically investigated. The heterojunction exhibits an enhanced photocurrent density (2.27 mA/cm² at 0.9 V vs. Ag/AgCl), which leads to a significant improvement in photoconversion efficiency (1.00% at about 0.7 V vs. Ag/AgCl). This remarkable PEC performance is mainly due to the constructive effect of the graphene (RGO) in expediting electron transfer and reducing charge recombination to realize enhanced use ratio of photo-generated carriers for the water splitting reaction. This result demonstrates the superiorities of the new graphene-mediated composites photoelectrode and provides a promising route for high-performance photoelectrochemical systems.

中文翻译：

---

用于高效光电化学水分解的WO 3纳米棒/石墨烯/ BiV 1-x Mo x O 4异质结光电极的制备

我们报道了一种新型的WO ₃纳米棒/石墨烯/ BiV _{1- x} Mo _x O ₄异质结光电极的制备，用于光电化学（PEC）水分解。异质结阵列是通过在FTO玻璃上水热沉积WO ₃纳米棒，随后通过旋涂法分别沉积石墨烯纳米片和BiV _{1- x} Mo _x O ₄来制造的。系统地研究了光电极的材料结构和PEC水分解性能。异质结表现出增强的光电流密度（2.27 mA / cm ²在相对于Ag / AgCl为0.9 V时），导致光转换效率有显着提高（在相对于Ag / AgCl为0.7 V时为1.00％）。出色的PEC性能主要归因于石墨烯（RGO）在加速电子转移和减少电荷重组以实现光生载体用于水分解反应的使用率方面的建设性作用。该结果证明了新型石墨烯介导的复合材料光电极的优越性，并为高性能光电化学系统提供了有希望的途径。