Liu Yunni, Kang Yuna, Zhang Zhenyi, Lin Jun
School of Chemistry and Life Resources, Renmin University of China, Beijing 100872, P. R. China.
Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, P. R. China.
Phys Chem Chem Phys. 2025 Jul 30;27(30):16103-16112. doi: 10.1039/d5cp01826a.
Combining tungsten trioxide (WO) with bismuth vanadate (BiVO) to form a heterojunction photoanode offers a promising solution to achieving highly efficient photoelectrocatalytic (PEC) performances. In this work, we successfully fabricated the WO/BiVO heterojunction on tungsten (W) foil a hydrothermal route, followed by a successive ionic layer adsorption and reaction (SILAR) process. The PEC performances for synergetic H evolution and organic pollutant degradation were significantly enhanced after the BiVO nanoparticles were loaded on the WO photoanode. The PEC performance with the WO/BiVO heterojunction as the photoanode was demonstrated to be much more dependent on the applied bias potential () than that with pristine WO as the photoanode. Based on the various photoelectrochemical features and fundamental theory of semiconductor heterojunctions, it was well elucidated that, under the applied bias potential, the gradual diminishment and eventual reversal of the energy band bending at the heterojunction interface could achieve the efficient transfer and separation of more photogenerated charges, thereby enhancing overall PEC performances. This work highlights the roles of the evolution of the band bending in the WO/BiVO heterojunction interface by applied bias in promoting the efficient transfer and separation of photogenerated charges.
将三氧化钨（WO）与钒酸铋（BiVO）结合形成异质结光阳极，为实现高效光电催化（PEC）性能提供了一种有前景的解决方案。在这项工作中，我们通过水热法在钨（W）箔上成功制备了WO/BiVO异质结，随后进行了连续离子层吸附和反应（SILAR）过程。在WO光阳极上负载BiVO纳米颗粒后，协同析氢和有机污染物降解的PEC性能得到显著增强。结果表明，以WO/BiVO异质结作为光阳极的PEC性能比以原始WO作为光阳极的情况更依赖于施加的偏置电势（）。基于各种光电化学特性和半导体异质结的基本理论，很好地阐明了在施加偏置电势的情况下，异质结界面处能带弯曲的逐渐减小和最终反转能够实现更多光生电荷的有效转移和分离，从而提高整体PEC性能。这项工作突出了通过施加偏置电势使WO/BiVO异质结界面处能带弯曲演变在促进光生电荷有效转移和分离方面的作用。
