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Green fabrication of nanoporous BiVO4 films on ITO substrates for photoelectrochemical water-oxidation.

ABSTRACT: A new green method was developed to prepare nanoporous BiVO4 films on ITO substrates for photoelectrochemical (PEC) water-oxidation under visible light irradiation. The films can be prepared by simple drop-casting of a stable aqueous solution of Bi3+ and V5+ complexes with tartaric acid and ethylenediaminetetraacetic acid, followed by drying and calcination in air. Thanks to these ligands, the aqueous precursor solution is remarkably stable over a wide range of pH (pH 4-9). The BiVO4 films on ITO substrates possess a 3D-network structure comprised of nanoparticles with a scheelite-monoclinic phase and a diameter of ca. <100 nm, after calcination at 450-500 °C for 1 h. The PEC performance clearly depended on the film thickness that can be controlled by coating times, and calcination conditions (temperature and time). The CoPi-loaded BiVO4 electrodes exhibited relatively high performance for PEC water oxidation (ABPE of 0.35% at 0.8 V vs. RHE) under simulated sunlight irradiation.

SUBMITTER: Okunaka S 

PROVIDER: S-EPMC9085641 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Green fabrication of nanoporous BiVO<sub>4</sub> films on ITO substrates for photoelectrochemical water-oxidation.

Okunaka Sayuri S   Hitomi Yutaka Y   Tokudome Hiromasa H  

RSC advances 20180910 55

A new green method was developed to prepare nanoporous BiVO<sub>4</sub> films on ITO substrates for photoelectrochemical (PEC) water-oxidation under visible light irradiation. The films can be prepared by simple drop-casting of a stable aqueous solution of Bi<sup>3+</sup> and V<sup>5+</sup> complexes with tartaric acid and ethylenediaminetetraacetic acid, followed by drying and calcination in air. Thanks to these ligands, the aqueous precursor solution is remarkably stable over a wide range of p  ...[more]

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