Spray-deposited Co-Pi Catalyzed BiVO4: a low-cost route towards highly efficient photoanodes

Autor:	Nienke J. Firet, Roel van de Krol, Ali Dabirian, Fatwa F. Abdi
Rok vydání:	2012
Předmět:	Photocurrent chemistry.chemical_compound Materials science Catalytic oxidation chemistry Bismuth vanadate Inorganic chemistry Kinetics Thin film Electron transport chain Cobalt phosphate Catalysis
Zdroj:	MRS Proceedings. 1446
ISSN:	1946-4274 0272-9172
DOI:	10.1557/opl.2012.811
Popis:	Bismuth vanadate (BiVO4) thin films are deposited by a low-cost and scalable spray pyrolysis method. Its performance under AM1.5 illumination is mainly limited by slow water oxidation kinetics. We confirm that cobalt phosphate (Co-Pi) is an efficient water oxidation catalyst for BiVO4. The optimum thickness of BiVO4 is 300 nm, resulting in an AM1.5 photocurrent of 1.9 mA/cm2 at 1.23 V vs. RHE when catalyzed with Co-Pi. Once the water oxidation limitation is removed, the performance is limited by low charge separation efficiency. This causes more than 60% of the electron-hole pairs to recombine before reaching the respective interfaces. The slow electron transport is shown to be the main cause of this low efficiency, and future efforts should therefore be focused on addressing this key limitation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fc9f93ec78119b5c5d70597995eb6ce5 https://doi.org/10.1557/opl.2012.811 Zobrazit plný text záznamu Full text from SpringerLink