tThe present research work focuses on bismuth vanadate (BiVO4) thin films deposited on FTO-coated glasselectrodes through the spin-coating technique, and discusses the influence of different film morphologies(dense and porous) on the physicochemical properties and photoelectrochemical (PEC) performance ofthe as-prepared photoanodes, for the water splitting reaction. The surface recombination phenomenon,which is one of the main issues of BiVO4, has been quantified by means of two distinct approaches: tran-sient photocurrent measurements and electrochemical impedance spectroscopy (EIS). This phenomenonhas resulted to be higher in the porous material, thus a poorer performance has been observed than inthe dense material. In order to increase the BiVO4efficiency, a cobalt phosphate (CoPi) catalyst has beenphoto-electrodeposited onto the best BiVO4electrode, employing an optimized technique and a pho-tocurrent of up to 3 mA/cm2at 1.23 V vs. RHE under neutral pH and 1 sun irradiation (100 mW/cm2)has been achieved. The charge transfer kinetics of the BiVO4photoanodes, with and without CoPi, hasalso been quantified. The beneficial effect of this water oxidation catalyst, as well as the influence of thepreparation method on the uniformity of the film and on its actual performance, is discussed in view ofits prospective application in a real PEC device.
Evaluation of the charge transfer kinetics of spin-coated BiVO4 thin films for sun-driven water photoelectrolysis / HERNANDEZ RIBULLEN, SIMELYS PRIS; Gerardi, Gianluca; Bejtka, Katarzyna; Fina, Alberto; Russo, Nunzio. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - ELETTRONICO. - 190:(2016), pp. 66-74. [10.1016/j.apcatb.2016.02.059]
Evaluation of the charge transfer kinetics of spin-coated BiVO4 thin films for sun-driven water photoelectrolysis
HERNANDEZ RIBULLEN, SIMELYS PRIS;GERARDI, GIANLUCA;Bejtka, Katarzyna;FINA, ALBERTO;RUSSO, Nunzio
2016
Abstract
tThe present research work focuses on bismuth vanadate (BiVO4) thin films deposited on FTO-coated glasselectrodes through the spin-coating technique, and discusses the influence of different film morphologies(dense and porous) on the physicochemical properties and photoelectrochemical (PEC) performance ofthe as-prepared photoanodes, for the water splitting reaction. The surface recombination phenomenon,which is one of the main issues of BiVO4, has been quantified by means of two distinct approaches: tran-sient photocurrent measurements and electrochemical impedance spectroscopy (EIS). This phenomenonhas resulted to be higher in the porous material, thus a poorer performance has been observed than inthe dense material. In order to increase the BiVO4efficiency, a cobalt phosphate (CoPi) catalyst has beenphoto-electrodeposited onto the best BiVO4electrode, employing an optimized technique and a pho-tocurrent of up to 3 mA/cm2at 1.23 V vs. RHE under neutral pH and 1 sun irradiation (100 mW/cm2)has been achieved. The charge transfer kinetics of the BiVO4photoanodes, with and without CoPi, hasalso been quantified. The beneficial effect of this water oxidation catalyst, as well as the influence of thepreparation method on the uniformity of the film and on its actual performance, is discussed in view ofits prospective application in a real PEC device.File | Dimensione | Formato | |
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