Abstract
The most crucial factors limiting the degradation performance of photoelectrocatalytic (PEC) process are the low charge separation efficiency and slow mass transportation. Herein, we report a WO3 network photoelectrode by constructing heterophase junction of WO3 on tungsten mesh (hm-m-WO3/W mesh), which exhibits superior PEC performance, as high as 5.6 mA cm−2 of photocurrent density at 1.2 VRHE, achieving a complete degradation (99.9%) and nearly total mineralization (84.5%) of bisphenol A, reaching an apparent reaction rate constant of 5.7 × 10−2 min−1, 1.5 times of WO3 based photoelectrode ever reported. A Schottky junction is formed at m-WO3/W interface which greatly promotes the charge transfer between catalysts and support. The catalysts show appropriate phase alignment, where the parallel directions between built-in electric field of heterophase junction and external potential benefit charge separation. Computational fluid dynamics simulations indicate the network structure favors the diffusion of the fluid containing pollutants. This work demonstrates a viable strategy for designing the photoelectrode with high charge separation efficiency and fast mass transportation in PEC wastewater treatment.
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