Gallium nitride nanowire as a linker of molybdenum sulfides and silicon for photoelectrocatalytic water splitting
Open Access
- 21 September 2018
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nature Communications
- Vol. 9 (1), 1-8
- https://doi.org/10.1038/s41467-018-06140-1
Abstract
The combination of earth-abundant catalysts and semiconductors, for example, molybdenum sulfides and planar silicon, presents a promising avenue for the large-scale conversion of solar energy to hydrogen. The inferior interface between molybdenum sulfides and planar silicon, however, severely suppresses charge carrier extraction, thus limiting the performance. Here, we demonstrate that defect-free gallium nitride nanowire is ideally used as a linker of planar silicon and molybdenum sulfides to produce a high-quality shell-core heterostructure. Theoretical calculations revealed that the unique electronic interaction and the excellent geometric-matching structure between gallium nitride and molybdenum sulfides enabled an ideal electron-migration channel for high charge carrier extraction efficiency, leading to outstanding performance. A benchmarking current density of 40 ± 1 mA cm−2 at 0 V vs. reversible hydrogen electrode, the highest value ever reported for a planar silicon electrode without noble metals, and a large onset potential of +0.4 V were achieved under standard one-sun illumination.Funding Information
- Emissions Reduction Alberta
- U.S. Department of Energy (DE-EE0008086)
This publication has 50 references indexed in Scilit:
- Single-nanowire solar cells beyond the Shockley–Queisser limitNature Photonics, 2013
- Wafer-Level Photocatalytic Water Splitting on GaN Nanowire Arrays Grown by Molecular Beam EpitaxyNano Letters, 2011
- Bioinspired molecular co-catalysts bonded to a silicon photocathode for solar hydrogen evolutionNature Materials, 2011
- Amorphous molybdenum sulfide films as catalysts for electrochemical hydrogen production in waterChemical Science, 2011
- Comment on “Trends in the Exchange Current for Hydrogen Evolution” [J. Electrochem. Soc., 152, J23 (2005)]Journal of the Electrochemical Society, 2006
- Trends in the Exchange Current for Hydrogen EvolutionJournal of the Electrochemical Society, 2005
- Band structure of and Angle-resolved photoelectron spectroscopy and ab initio calculationsPhysical Review B, 2001
- Phonons and related crystal properties from density-functional perturbation theoryReviews of Modern Physics, 2001
- From ultrasoft pseudopotentials to the projector augmented-wave methodPhysical Review B, 1999
- Efficient iterative schemes forab initiototal-energy calculations using a plane-wave basis setPhysical Review B, 1996