Understanding the Roles of NiO x in Enhancing the Photoelectrochemical Performance of BiVO 4 Photoanodes for Solar Water Splitting.

Autor: Zhang M; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore., Antony RP; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore.; Chemistry Division, Chemistry Group, Bhabha Atomic Research Center, Mumbai, 400085, India., Chiam SY; Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Innovis, 2 Fusionopolis Way, Singapore, 138634, Singapore., Abdi FF; Institute for Solar Fuels, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, Berlin, 14109, Germany., Wong LH; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798, Singapore.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2019 May 08; Vol. 12 (9), pp. 2022-2028. Date of Electronic Publication: 2018 Oct 23.
DOI: 10.1002/cssc.201801780
Abstrakt: Solar water oxidation is considered as a promising method for efficient utilization of solar energy and bismuth vanadate (BiVO 4 ) is a potential photoanode. Catalyst loading on BiVO 4 is often used to tackle the limitations of charge recombination and sluggish kinetics. In this study, amorphous nickel oxide (NiO x ) is loaded onto Mo-doped BiVO 4 by photochemical metal-organic deposition method. The resulting NiO x /Mo:BiVO 4 photoanodes demonstrate a two-fold improvement in photocurrent density (2.44 mA cm -2 ) at 1.23 V versus reversible hydrogen electrode (RHE) compared with the uncatalyzed samples. After NiO x modification the charge-separation and charge-transfer efficiencies improve significantly across the entire potential range. It is further elucidated by open-circuit photovoltage (OCP), time-resolved-microwave conductivity (TRMC), and rapid-scan voltammetry (RSV) measurements that NiO x modification induces larger band bending and promotes efficient charge transfer on the surface of BiVO 4 . This work provides insight into designing BiVO 4 -catalyst assemblies by using a simple surface-modification route for efficient solar water oxidation.
(© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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