A conductive ZnO-ZnGaON nanowire-array-on-a film photoanode for stable and efficient sunlight water splitting
2014 (English)In: Energy & Environmental Science, ISSN 1754-5692, E-ISSN 1754-5706, Vol. 7, no 5, 1693-1699 p.Article in journal (Refereed) Published
We report highly stable and efficient sunlight water splitting on a ZnO-ZnGaON nanowire-array-on-a-film photoanode without the assistance of any co-catalyst. The single crystalline ZnO-ZnGaON nanowirearray- on-a-film photoanode was synthesized via a high-temperature vapor-phase diffusion reaction of gallium (Ga) and nitrogen (N) on a single crystal domain ZnO nanowire-array-on-a-film structure. The synthesized ZnO-ZnGaON photoanode offers visible light absorption through N incorporation, improved electrical conductivity via Ga incorporation, and structural advantages with the high-aspect-ratio nanowire array. Compared to the chemically unstable ZnO nanowire photoanode, the ZnO-ZnGaON nanowire photoanode significantly improves the anti-photocorrosive ability for water splitting. A highly stable photocurrent density of similar to 1.5 mA cm(-2) is obtained with the ZnO-ZnGaON nanowire photoanode at an applied bias of 0.8 V-RHE under continuous sunlight illumination over five hours without noticeable degradation.
Place, publisher, year, edition, pages
2014. Vol. 7, no 5, 1693-1699 p.
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-104130DOI: 10.1039/c3ee43806fISI: 000335013700018OAI: oai:DiVA.org:su-104130DiVA: diva2:721170