Efficient water reduction with gallium phosphide nanowires

A.J. Standing, S. Assali, L. Gao, M.A. Verheijen, A.D. Dam, van, Y. Cui, P.H.L. Notten, J.E.M. Haverkort, E.P.A.M. Bakkers

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Abstract

Photoelectrochemical hydrogen production from solar energy and water offers a clean and sustainable fuel option for the future. Planar III/V material systems have shown the highest efficiencies, but are expensive. By moving to the nanowire regime the demand on material quantity is reduced, and new materials can be uncovered, such as wurtzite gallium phosphide, featuring a direct bandgap. This is one of the few materials combining large solar light absorption and (close to) ideal band-edge positions for full water splitting. Here we report the photoelectrochemical reduction of water, on a p-type wurtzite gallium phosphide nanowire photocathode. By modifying geometry to reduce electrical resistance and enhance optical absorption, and modifying the surface with a multistep platinum deposition, high current densities and open circuit potentials were achieved. Our results demonstrate the capabilities of this material, even when used in such low quantities, as in nanowires.
Original languageEnglish
Pages (from-to)7824-1/7
Number of pages7
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 2015

Fingerprint

Nanowires
gallium phosphides
wurtzite
nanowires
clean fuels
water splitting
Water
solar energy
hydrogen production
electrical resistance
Solar Energy
water
platinum
Platinum
Electric Impedance
Acoustic impedance
Hydrogen
Hydrogen production
geometry
Solar energy

Cite this

Standing, A.J. ; Assali, S. ; Gao, L. ; Verheijen, M.A. ; Dam, van, A.D. ; Cui, Y. ; Notten, P.H.L. ; Haverkort, J.E.M. ; Bakkers, E.P.A.M. / Efficient water reduction with gallium phosphide nanowires. In: Nature Communications. 2015 ; Vol. 6. pp. 7824-1/7.
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Efficient water reduction with gallium phosphide nanowires. / Standing, A.J.; Assali, S.; Gao, L.; Verheijen, M.A.; Dam, van, A.D.; Cui, Y.; Notten, P.H.L.; Haverkort, J.E.M.; Bakkers, E.P.A.M.

In: Nature Communications, Vol. 6, 2015, p. 7824-1/7.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Cui, Y.

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AB - Photoelectrochemical hydrogen production from solar energy and water offers a clean and sustainable fuel option for the future. Planar III/V material systems have shown the highest efficiencies, but are expensive. By moving to the nanowire regime the demand on material quantity is reduced, and new materials can be uncovered, such as wurtzite gallium phosphide, featuring a direct bandgap. This is one of the few materials combining large solar light absorption and (close to) ideal band-edge positions for full water splitting. Here we report the photoelectrochemical reduction of water, on a p-type wurtzite gallium phosphide nanowire photocathode. By modifying geometry to reduce electrical resistance and enhance optical absorption, and modifying the surface with a multistep platinum deposition, high current densities and open circuit potentials were achieved. Our results demonstrate the capabilities of this material, even when used in such low quantities, as in nanowires.

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