Fabrication of Zinc Oxide Nanorods for Photoelectrochemical Water Splitting Application

Abstract:

Abstract. Zinc oxide nanorods (ZnO-NRs) as a photoelectrochemical water splitting electrode have been fabricated by the seed-assisted hydrothermal process. Initially, ZnO-seed thin film was deposited on indium doped tin oxide (ITO) via DC magnetron sputtering system. Period to fabricate ZnO-NRs, the precursor concentration of zinc nitrate (Zn(NO₃)₂) and hexamethylenetetramine (HMTA) were precisely controlled during 10 – 50 mM, meanwhile the ratio was constantly kept at 1:1. The crystallography and surface morphology of the fabricated ZnO-NRs were investigated by X-ray diffraction (XRD) and field emission scanning electron microscope (FE-SEM). The XRD patterns perform wurtzite ZnO crystal structure of with the prefered orientation in (002) and (101) plane. According to FE-SEM photograph, growth rate, density and diameter of the fabricated ZnO-NRs electrode significantly increase, with the increasing of the precursor concentration. This precursor concentration provides a crucial role on the feature of ZnO-NRs for photoelectrochemical water splitting electrode. Finally, the photoelectrochemical water splitting performance was examined and provided that the precursor concentration became close to 30 mM in 1 M Na₂SO₄ exhibited the highest photocurrent.

• Periodical: Key Engineering Materials (Volumes 675-676)
• Pages: 117-120
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.675-676.117
• Online since: January 2016
• Authors: Poosuda Phetban, Narathon Khemasiri, Sukon Kalasung, Sukukittaya Jessadaluk, Mati Horprathum, Pitak Eiamchai, Supanit Pornthreeraphat, Darinee Phromyothin*
• Keywords: Photoelectrochemical Water Splitting, ZnO-NRs

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