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Wafer-level photocatalytic water splitting on GaN nanowire arrays grown by molecular beam epitaxy. 2011
Defa Wang, and
Adrien Pierre, and
Md Golam Kibria, and
Kai Cui, and
Xueguang Han, and
Kirk H Bevan, and
Hong Guo, and
Suzanne Paradis, and
Abou-Rachid Hakima, and
Zetian Mi
Department of Electrical and Computer Engineering, McGill University, 3480 University Street, Montreal, Quebec H3A 2A7, Canada.
We report on the achievement of wafer-level photocatalytic overall water splitting on GaN nanowires grown by molecular beam epitaxy with the incorporation of Rh/Cr(2)O(3) core-shell nanostructures acting as cocatalysts, through which H(2) evolution is promoted by the noble metal core (Rh) while the water forming back reaction over Rh is effectively prevented by the Cr(2)O(3) shell O(2) diffusion barrier. The decomposition of pure water into H(2) and O(2) by GaN nanowires is confirmed to be a highly stable photocatalytic process, with the turnover number per unit time well exceeding the value of any previously reported GaN powder samples.
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