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A Tandem Photoelectrochemical Water Splitting Cell Consisting of CuBi2O4 and BiVO4 Synthesized from a Single Bi4O5I2 Nanosheet Template

Abstract

A simple and facile method for preparing both photocathode and photoanode from a single template of Bi4O5I2 for assembling an inexpensive tandem cell is reported. A nanosheet structured Bi4O5I2 (nanoBi4O5I2) is first synthesized on a conducting glass substrate by a novel solvothermal method. NanoBi4O5I2 is further used a template for the conversion of a CuBi2O4 photocathode and a BiVO4 photoanode by solution based conversion methods followed by heat treatments. The resulted CuBi2O4 and BiVO4 are well crystallized and have a textured microstructure and a coral-like nanostructure, respectively. UV-vis absorption spectra and Mott-Schottky analyses confirm CuBi2O4 and BiVO4 have well-suited band gaps for absorbing large portion of visible light and complementary band structures for proton reduction and water oxidation, respectively. Photoelectrochemical study suggest both CuBi2O4 and BiVO4 suffer from poor charge transfer yields and therefore a Janus cobalt based catalyst (Co-Bi) was further deposited onto these photoelectrodes. A tandem cell consists of a Co-Bi modified CuBi2O4 photocathode and a Co-Bi modified BiVO4 photoanode was further assembled for overall water splitting under simulated solar light irradiation. This tandem cell operates with a small output of photocurrent in the absence of an external bias. Factors limit the performance of the tandem cell are also discussed.

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Publication details

The article was received on 16 Nov 2018, accepted on 21 Dec 2018 and first published on 21 Dec 2018


Article type: Paper
DOI: 10.1039/C8FD00183A
Citation: Faraday Discuss., 2018, Accepted Manuscript

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    A Tandem Photoelectrochemical Water Splitting Cell Consisting of CuBi2O4 and BiVO4 Synthesized from a Single Bi4O5I2 Nanosheet Template

    Y. Lai, K. Lin, C. Yen and B. Jiang, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00183A

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