EFFICIENT PHOTOELECTROCHEMICAL WATER OXIDATION BY COBALT PHOSPHATE MODIFIED COMPOSITE

doi:10.4066/2591-7331-C1-003

EFFICIENT PHOTOELECTROCHEMICAL WATER OXIDATION BY COBALT PHOSPHATE MODIFIED COMPOSITE

7^th International Conference on Green Chemistry & Technology
June 18-20, 2018 | Dublin, Ireland

Kyo-Seon Kim, Tangnuer Sadike and Jin-Rui Ding

Kangwon National University, South Korea

Posters & Accepted Abstracts : J Ind Environ Chem

DOI: 10.4066/2591-7331-C1-003

Abstract:

Photoelectrochemical (PEC) water splitting is considered as one of the most promising approaches to convert solar energy into hydrogen energy. It involves hydrogen evolution reaction and oxygen evolution reaction (OER) and OER is a kinetically more difficult reaction. WO3 nanowire has attracted much attention due to its favorable valence band position for water oxidation, better electron transport property and chemical stability. Moreover, BiVO4 is a promising photoanode with its optical band gap for visible light absorption and can form the heterojunction structure with WO3 to complement each other’s advantages. Through this configuration, charge separation efficiency is highly enhanced with reduced recombination rate. Besides, it is also important to improve charge reaction kinetics at the electrode and electrolyte interface by applying oxygen evolution catalysts (OEC). A simple and effective earthabundant catalyst known as cobalt phosphate (Co-Pi) was discovered as oxygen evolution catalysts by Nocera and coworkers and was applied to improve the photoanode performances. We studied the effect of Co-Pi on WO3/BiVO4 composite photoanode. The nanostructure WO3 was prepared by flame vapor deposition (FVD) and was coated by BiVO4 using spin coating method. The Co-Pi OEC is deposited onto the WO3 photoanode and WO3/BiVO4 (core-shell) heterojunction structure, respectively, by photo-assisted electrodeposition method. When Co-Pi was deposited on WO3/BiVO4, the onset potential was shifted negatively accompanied with increased photocurrent, while Co-Pi on WO3 didn’t show such significant improvement.

Biography:

Kyo-Seon Kim is currently a Professor of Chemical Engineering at Kangwon National University, Chuncheon, South Korea, where he has been working from 1989. He received his BS, MS and PhD degrees all in Chemical Engineering from Seoul National University, KAIST and University of Cincinnati, OH, USA in 1979, 1981 and 1989, respectively. His research interests are mainly focused on preparation and modification of nanoparticles for high-functional performances. The main applications of nanoparticles in his researches are in the fields of air pollution control, energy harvesting and development of medical devices.

Email:kkyoseon@kangwon.ac.kr

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