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- W2028453344 abstract "ABSTRACT Photoelectrochemical performances of ZnO electrodes are enhanced by coupling with cobalt-basedcatalyst (CoPi) in phosphate electrolyte (pH 7). For this study, hexagonal pillar-shaped ZnO nanorodsare grown on ZnO electrodes through a chemical bath deposition, onto which CoPi is depositedwith different photodeposition times (10-30 min). A scanning electron microscopic study indicatesthat CoPi deposition does not induce any change of ZnO morphology and an energy-dispersive X-rayspectroscopic analysis shows that inorganic phosphate ions (Pi) exist on ZnO surface. Bare ZnOelectrodes generate the current of ca. 0.36 mA/cm 2 at a bias potential of 0.5 V vs. SCE, whereasZnO/CoPi (deposited for 10 min) has ca. 50%-enhanced current (0.54 mW/cm 2 ) under irradiation ofAM 1.5G-light (400 mW/cm 2 ). The excess loading of CoPi on ZnO results in decrease of photo-currents as compared to bare ZnO likely due to limited electrolyte access to ZnO and/or CoPi-mediatedrecombination of photogenerated charge carriers. The primary role of CoPi is speculated to trap thephotogenerated holes and thereby oxidize water into molecular oxygen via an intervalency cycleamong Co(II), Co(III), and Co(IV).Key words: Artificial photosynthesis, Solar hydrogen, Electrocatalyst, Water splitting, Semicon-ductors" @default.
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- W2028453344 date "2011-12-31" @default.
- W2028453344 modified "2023-10-16" @default.
- W2028453344 title "Photoelectrochemical Water Oxidation Using ZnO Nanorods Coupled with Cobalt-Based Catalysts" @default.
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- W2028453344 doi "https://doi.org/10.5229/jecst.2011.2.4.187" @default.
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