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Optimization of porous BiVO4 photoanode from electrodeposited Bi electrode: Structural factors affecting photoelectrochemical performance

Optimization of porous BiVO4 photoanode from electrodeposited Bi electrode: Structural factors affecting photoelectrochemical performance
Kim, HR[Kim, Hye Rim]Kim, G[Kim, Gonu]In, SI[In, Su-Il]Park, Y[Park, Yiseul]
DGIST Authors
Kim, HR[Kim, Hye Rim]; Kim, G[Kim, Gonu]; In, SI[In, Su-Il]; Park, Y[Park, Yiseul]
Issue Date
Electrochimica Acta, 189, 252-258
Article Type
BiVO4Chemical ReactionsCorrosionDeposition ConditionsElectrochemistryElectrodepositionElectrodeposition ConditionsElectrodesElectromagnetic Wave AbsorptionEnergy ConversionGrowth KineticsGrowth MechanismGrowth MechanismsLight AbsorptionNucleation and Growth KineticsOptimizationParticle SizePhotocurrent DensityPhotoelectrochemical PerformancePorositySolar EnergySolar Energy ConversionStructure and Morphology
In this study, BiVO4 photoanode is prepared via the chemical reaction of electrodeposited Bi metal electrode with a vanadium precursor, and the electrodeposition conditions for the Bi electrode are modified to optimize the resultant BiVO4's photoelectrochemical performance. The nucleation and growth kinetics of Bi dendrites are varied by changing the applied potential and temperature during electrodeposition. This affects the structure and morphology of Bi as well as the properties of the resultant BiVO4 after the chemical reaction. Specifically, the morphology, particle size, porosity, and facet exposure of BiVO4 are changed according to the applied potential and temperature during the electrodeposition of Bi. The decrease in particle size and increase in porosity and active facet exposure under optimized conditions are responsible for the improved photoelectrochemical performance. The photocurrent density of BiVO4 prepared under optimized condition is over 5 mA cm-2 at 1.25 VRHE for sulfite oxidation; this represents an improvement of almost 2.5 times compared to that of non-optimized BiVO4. Furthermore, the BiVO4 samples prepared under different deposition conditions only show changes in structural properties and not in other intrinsic properties such as the light absorption, energy level, and carrier density. Therefore, the structural effect of BiVO4 on the performance can be elucidated clearly. © 2015 Elsevier Ltd. All rights reserved.
Elsevier Ltd
Related Researcher
  • Author In, Su Il Green and Renewable Energy for Endless Nature(GREEN) Lab
  • Research Interests CO2 conversion to hydrocarbon fuels; Water splitting for hydrogen generation; Quantum dot devices; Dye sensitized solar cells; Environmental remediation; Synthesis of functional nanomaterials; CO2 연료전환; 수소생산을 위한 광전기화학적 물분해; 양자점 태양전지; 염료감응 태양전지; 공해물질 저감연구; 기능성 나노소재 개발
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