Hajra, PKundu, SMaity, ArjunBhattacharya, C2019-10-092019-10-092019-10Hajra, P. et al. 2019. Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions. Chemical Engineering Journal, vol. 374, pp. 1221-12301385-89471873-3212https://www.sciencedirect.com/science/article/pii/S1385894719312719https://doi.org/10.1016/j.cej.2019.06.014http://hdl.handle.net/10204/11161Copyright: 2019 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Chemical Engineering Journal, vol. 374, pp. 1221-1230In this study, the organic solvent free ‘green synthesis’ of bismuth vanadate (BiVO4) has been described for its application in photoelectrochemical (PEC) water oxidation. BiVO4 thin films were successfully prepared through electrodeposition of Bi film on the FTO glass substrate from the aqueous bath containing Bi(NO3)3 in presence of K-Na-tartrate and dextrose; followed by thermo-chemical reaction with an aqueous solution of vanadium acetylacetonate (VO(acac)2). XRD & SEM-EDS analyses indicated the formation of scheelite monoclinic BiVO4 with seed-like morphology. UV–visible absorption spectra measured the band gap energy ~ 2.3 eV indicating visible-light activity of the photocatalyst and the Mott-Schottky analysis showed n-type nature of the semiconductor. Highest photocurrent of 1.3 mA cm-2 (at ~1 V vs Ag/AgCl) for water oxidation and 2 mA cm-2 (at ~0.6 V vs Ag/AgCl) for sacrificial (SO32-) oxidation were measured under 35 mW cm-2 illumination using the optimized thin film and the maximum incident photon to current conversion efficiency (IPCE) of 42% was obtained. The enhanced photocurrent in solar-assisted water oxidation is attributed to the formation of well covered and compact film with improved electrical continuity, shown by minimum charge transfer resistance. Adsorption of an optimized amount of Co2+ over the BiVO4 improves its catalytic properties towards oxygen evolution reaction by approximately 2.5 times, with lowering of charge transfer resistance of the material as measured through impedance analysis.enBiVO4 semiconductorGreen synthesisElectrodepositionOxygen evolution catalystPhotoelectrochemical water oxidationArticleHajra, P., Kundu, S., Maity, A., & Bhattacharya, C. (2019). Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions. http://hdl.handle.net/10204/11161Hajra, P, S Kundu, Arjun Maity, and C Bhattacharya "Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions." (2019) http://hdl.handle.net/10204/11161Hajra P, Kundu S, Maity A, Bhattacharya C. Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions. 2019; http://hdl.handle.net/10204/11161.TY - Article AU - Hajra, P AU - Kundu, S AU - Maity, Arjun AU - Bhattacharya, C AB - In this study, the organic solvent free ‘green synthesis’ of bismuth vanadate (BiVO4) has been described for its application in photoelectrochemical (PEC) water oxidation. BiVO4 thin films were successfully prepared through electrodeposition of Bi film on the FTO glass substrate from the aqueous bath containing Bi(NO3)3 in presence of K-Na-tartrate and dextrose; followed by thermo-chemical reaction with an aqueous solution of vanadium acetylacetonate (VO(acac)2). XRD & SEM-EDS analyses indicated the formation of scheelite monoclinic BiVO4 with seed-like morphology. UV–visible absorption spectra measured the band gap energy ~ 2.3 eV indicating visible-light activity of the photocatalyst and the Mott-Schottky analysis showed n-type nature of the semiconductor. Highest photocurrent of 1.3 mA cm-2 (at ~1 V vs Ag/AgCl) for water oxidation and 2 mA cm-2 (at ~0.6 V vs Ag/AgCl) for sacrificial (SO32-) oxidation were measured under 35 mW cm-2 illumination using the optimized thin film and the maximum incident photon to current conversion efficiency (IPCE) of 42% was obtained. The enhanced photocurrent in solar-assisted water oxidation is attributed to the formation of well covered and compact film with improved electrical continuity, shown by minimum charge transfer resistance. Adsorption of an optimized amount of Co2+ over the BiVO4 improves its catalytic properties towards oxygen evolution reaction by approximately 2.5 times, with lowering of charge transfer resistance of the material as measured through impedance analysis. DA - 2019-10 DB - ResearchSpace DP - CSIR KW - BiVO4 semiconductor KW - Green synthesis KW - Electrodeposition KW - Oxygen evolution catalyst KW - Photoelectrochemical water oxidation LK - https://researchspace.csir.co.za PY - 2019 SM - 1385-8947 SM - 1873-3212 T1 - Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions TI - Facile photoelectrochemical water oxidation on Co2+-adsorbed BiVO4 thin films synthesized from aqueous solutions UR - http://hdl.handle.net/10204/11161 ER -