Photoelectrocatalytic degradation of refractory pollutants over WO3/W network photoelectrode with heterophase junction for enhancing mass transportation and charge separation

Ma, Qiuling ¹Song, Rui ¹Ren, Fujun ¹Wang, Hao ¹Gao, Wensheng ¹Li, Zelong ¹Li, Can¹

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作者信息

1. Lanzhou Univ
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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 V-RHE, achieving a complete degradation (99.9%) and nearly total mineralization (84.5%) of bisphenol A, reaching an apparent reaction rate constant of 5.7 x 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.

Key words

Network photoelectrode/Photoelectrocatalysis/Charge separation/Mass transportation/Refractory pollutants/PHASE JUNCTION/WATER/PHOTOANODE/OXIDATION/BARRIER/PERFORMANCE/VACANCIES/ELECTRODE/ARRAYS/ENERGY

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量18

参考文献量57

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