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Enhanced water splitting performance of GaN photoanode using self-assembled nickel/nickel-oxide nanoparticle catalyst
- Source :
- International Journal of Hydrogen Energy. 42:27066-27072
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Ni/NiOx core-shell nanoparticles were used to improve the water splitting efficiency and stability of an n-GaN photoanode. Nanoparticles were fabricated by thermal annealing and oxidizing a Ni thin film deposited on an n-GaN substrate. The performance of water splitting was investigated by varying Ni film thickness and oxidation time, which led to different nanoparticle distribution and NiOx thickness in the core-shell structure. Nanoparticles fabricated from a thinner Ni film led to a smaller particle-to-particle spacing. It allowed holes in n-GaN to diffuse to nanoparticle catalysts in a shorter distance for water splitting reaction, thereby providing higher photocurrent and better protection against oxidation corrosion. Ni/NiOx core-sell nanoparticles obtained from partial oxidation showed higher photocurrent than sole Ni or fully oxidized NiOx nanoparticles. It is attributed to the optimization between having more NiOx for reaction centers and keeping NiOx thin for easy hole transport from n-GaN across NiOx to NiOx/electrolyte interface for reaction.
- Subjects :
- Photocurrent
Materials science
Renewable Energy, Sustainability and the Environment
Nickel oxide
Energy Engineering and Power Technology
chemistry.chemical_element
Nanoparticle
Nanotechnology
02 engineering and technology
Substrate (electronics)
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
Nickel
Fuel Technology
chemistry
Chemical engineering
Water splitting
Partial oxidation
Thin film
0210 nano-technology
Subjects
Details
- ISSN :
- 03603199
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- International Journal of Hydrogen Energy
- Accession number :
- edsair.doi...........7f5f65e4ffe45943d038acdb53ac4142