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Chemical synthesis of ZnO nanorods: Investigations of electrochemical performance and photo-electrochemical water splitting applications

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Abstract Zinc Oxide (ZnO) nanorods were prepared by facile and inexpensive chemical route at low temperature. X-ray diffraction study confirms the formation of hexagonal wurtzite crystal structure with high orientation… Click to show full abstract

Abstract Zinc Oxide (ZnO) nanorods were prepared by facile and inexpensive chemical route at low temperature. X-ray diffraction study confirms the formation of hexagonal wurtzite crystal structure with high orientation along the c-axis. FE-SEM images show a vertical alignment of ZnO nanorods to the substrate surface, whose average diameter and length is 1.33 and 15 μm, respectively. Electrochemical performance and photo-electrochemical water splitting of ZnO nanorods are investigated in 1 M Na 2 SO 4 electrolyte using the different electrochemical techniques. Electrochemical study of ZnO nanorods exhibits the maximum areal capacitance of 29.36 mFcm −2 in the negative potential window, which is higher than the areal capacitance of 10.84 mFcm −2 in the positive potential window at the scan rate of 5 mVs −1 . ZnO nanorods show the excellent stability of 97% over the 3000 cycles in both potential windows. Photo-electrochemical water splitting demonstrates the fast photo-response with 0.098% photo-conversion efficiency.

Keywords: water splitting; zno; photo electrochemical; zno nanorods; electrochemical water

Journal Title: Journal of Alloys and Compounds
Year Published: 2017

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