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Issue 12, 2016
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Photoelectrochemical cell for unassisted overall solar water splitting using a BiVO4 photoanode and Si nanoarray photocathode

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Abstract

Overall solar water splitting without external bias was demonstrated in this study using a photoelectrochemical tandem device composed of a BiVO4 photoanode and Si nanoarray photocathode. An unassisted photocurrent density of 0.6 mA cm−2 is possible under AM 1.5G illumination, by examining the current density–voltage curves of respective photoelectrodes and the operating point in the three-electrode system. We then investigated the unassisted two-electrode operation of the tandem cell, and a solar-to-hydrogen efficiency of 0.57% (corresponding photocurrent density of 0.46 mA cm−2) was achieved under AM 1.5G illumination (100 mW cm−2). The solar photocurrent density of this tandem cell decayed during the stability testing, possibly due to the dissolution of the Co-Pi electrocatalyst rather than the instability of the p-Si photocathode.

Graphical abstract: Photoelectrochemical cell for unassisted overall solar water splitting using a BiVO4 photoanode and Si nanoarray photocathode

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Publication details

The article was received on 29 Sep 2015, accepted on 12 Jan 2016 and first published on 15 Jan 2016


Article type: Paper
DOI: 10.1039/C5RA20115B
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RSC Adv., 2016,6, 9905-9910

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    Photoelectrochemical cell for unassisted overall solar water splitting using a BiVO4 photoanode and Si nanoarray photocathode

    P. Xu, J. Feng, T. Fang, X. Zhao, Z. Li and Z. Zou, RSC Adv., 2016, 6, 9905
    DOI: 10.1039/C5RA20115B

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