Insight into Charge Separation in WO3 /BiVO4 Heterojunction for Solar Water Splitting

ACS Applied Materials & Interfaces
Sang Youn ChaeYun Jeong Hwang

Abstract

Recently, the WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid. The PEC performance of the WO3 mesoporous photoanodes with various morphologies and the individual heterojunctions with BiVO4 (WO3/BiVO4) were characterized by measuring the photocurrents in the absence/presence of hole scavengers using light absorption spectroscopy and intensity-modulated photocurrent spectroscopy. The morphology of the WO3 photoanode directly influenced the charge separation efficiency within the WO3 layer and concomitant charge collection efficiency in the WO3/BiVO4 heterojunction, showing the smaller sized nanosphere WO3 layer showed higher values than did the plate-like or rod-like one. Notably, we observed that photocurrent density of WO3/BiVO4 was not depend...Continue Reading

References

Apr 28, 2007·Accounts of Chemical Research·Markus Niederberger
Sep 18, 2010·Chemical Communications : Chem Comm·Li LiDominik Eder
Oct 25, 2012·Chemical Society Reviews·Yiseul ParkKyoung-Shin Choi

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Citations

Sep 24, 2020·Nanomaterials·Yerkin ShabdanNurxat Nuraje
Sep 13, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ivan GrigioniElena Selli
Dec 10, 2020·Chemical Society Reviews·Christine Kranz, Maria Wächtler
May 16, 2019·ACS Applied Materials & Interfaces·Bo Reum LeeHo Won Jang
Dec 17, 2021·ACS Applied Materials & Interfaces·Chenyu ZhouMingzhao Liu

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