Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5147925 | International Journal of Hydrogen Energy | 2017 | 7 Pages |
Abstract
n-type GaN photoanodes used for water splitting have stability problems. One means of resolving this is loading NiO catalyst on the n-type GaN surface. Aqueous electrolytes H2SO4, HCl, KOH, and NaOH are usually used for photoelectrochemical water splitting. However, suitable electrolytes for the NiO-loading on n-type GaN photoelectrode have not yet been evaluated. Therefore, we investigated the effects of changing electrolytes used for NiO-loading in this study. The photocurrent of NiO-loading on n-type GaN increased when KOH and NaOH electrolytes were used. In addition, the surfaces showed no corrosion after reaction when these electrolytes were used. However, the photocurrent was not stable using KOH electrolyte. Interestingly, stable photocurrent was observed with when the NaOH electrolyte was used. In the case of H2SO4, the photocurrent of GaN did not change with and without NiO. The surface morphologies became rough because of GaN corrosion, and NiO dissolved in the H2SO4 electrolyte.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Kayo Koike, Kazuhiro Yamamoto, Satoshi Ohara, Tomoka Kikitsu, Kazunari Ozasa, Shinichiro Nakamura, Masakazu Sugiyama, Yoshiaki Nakano, Katsushi Fujii,