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http://dx.doi.org/10.6117/kmeps.2020.27.2.033

Photoelectrochemical Properties of Gallium Nitride (GaN) Photoelectrode Using Cobalt-phosphate (Co-pi) as Oxygen Evolution Catalyst  

Seong, Chaewon (Department of Advanced Chemicals & Engineering, Chonnam National University)
Bae, Hyojung (Optoelectronics Convergence Research Center, Chonnam National University)
Burungale, Vishal Vilas (Department of Advanced Chemicals & Engineering, Chonnam National University)
Ha, Jun-Seok (Department of Advanced Chemicals & Engineering, Chonnam National University)
Publication Information
Journal of the Microelectronics and Packaging Society / v.27, no.2, 2020 , pp. 33-38 More about this Journal
Abstract
In the photoelectrochemical (PEC) water splitting, GaN is one of the most promising photoanode materials due to high stability in electrolytes and adjustable energy band position. However, the application of GaN is limited because of low efficiency. To improve solar to hydrogen conversion efficiency, we introduce a Cobalt Phosphate (Co-pi) catalyst by photo-electrodeposition. The Co-pi deposition GaN were characterized by SEM, EDS, and XPS, respectively, which illustrated that Co-pi was successfully decorated on the surface of GaN. PEC measurement showed that photocurrent density of GaN was 0.5 mA/㎠ and that of Co-pi deposited GaN was 0.75 mA/㎠. Impedance and Mott-Schottky measurements were performed, and as a result of the measurement, polarization resistance (Rp) and increased donor concentration (ND) values decreased from 50.35 Ω to 34.16 Ω were confirmed. As a result of analyzing the surface components before and after the water decomposition, it was confirmed that the Co-pi catalyst is stable because Co-pi remains even after the water decomposition. Through this, it was confirmed that Co-pi is effective as a catalyst for improving GaN efficiency, and when applied as a catalyst to other photoelectrodes, it is considered that the efficiency of the PEC system can be improved.
Keywords
Gallium nitride; Photoelectrode; Oxygen Evolution Catalyst; Water splitting; Co-phosphate; Deposition; Photoelectrochemistry; Hydrogen generation;
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Times Cited By KSCI : 3  (Citation Analysis)
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