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Solution-Processed Yolk-Shell-Shaped WO3/BiVO4 Heterojunction Photoelectrode for Efficient Solar Water Splitting

Abstract

The WO3/BiVO4 heterojunction is regarded as one of the most promising photoanodes materials for photoelectrochemical (PEC) water splitting. To improve the solar water splitting efficiency, maximizing the solar light absorption efficiency in a photoelectrode is still a critical issue. Here, to achieve the aforementioned need, we designed and fabricated a WO3 film consisting of yolk-shell structured nanoparticles via solution processing. A thin BiVO4 layer with a smaller bandgap was coated onto the surface and inside the WO3 shells, providing a rationally designed inner space between the particles and the shell for better electrolyte accessibility. The yolk-shell-shaped PEC photoanode not only induces strong light scattering for efficient light absorption but also plays an important role for electron collection from BiVO4 due to an enlarged contact area. The relationship of the structure-PEC performance was studied by combining ultraviolet-visible (UV-vis) absorption spectra with specular and diffuse reflectance technique, which illustrates that the yolk-shell morphology has a superior light absorption ability than conventional hollow or dense film structure. The pure yolk-shell (Y-WO3/BiVO4) photoanode possessed a photocurrent density of 2.3 mA/cm2 and achieved a highest value of ~5.0 mA/cm2 after adding a Fe-Ni co-catalyst at a bias of 1.23 V vs. RHE under AM 1.5 illumination (100 mW/cm2).

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Publication details

The article was received on 24 Sep 2017, accepted on 03 Jan 2018 and first published on 03 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA08452H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Solution-Processed Yolk-Shell-Shaped WO3/BiVO4 Heterojunction Photoelectrode for Efficient Solar Water Splitting

    B. Jin, E. Jung, M. Ma, S. Kim, K. Zhang, J. I. Kim, Y. Son and J. H. Park, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C7TA08452H

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