Journal
NANO LETTERS
Volume 11, Issue 8, Pages 3440-3446Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201908s
Keywords
Plasmon; noble metal nanoparticles; iron oxide; water splitting; water oxidation; solar fuel
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Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001060]
- Samsung
- Deutsche Forschungsgemeinschaft (DFG)
- Natural Sciences and Engineering Research Council of Canada
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Future generations of photoelectrodes for solar fuel generation must employ inexpensive, earth-abundant absorber materials in order to provide a large-scale source of clean energy. These materials tend to have poor electrical transport properties and exhibit carrier diffusion lengths which are significantly shorter than the absorption depth of light. As a result, many photoexcited carriers are generated too far from a reactive surface and recombine instead of participating in solar-to-fuel conversion. We demonstrate that plasmonic resonances in metallic nanostructures and multilayer interference effects can be engineered to strongly concentrate sunlight close to the electrode/liquid interface, precisely where the relevant reactions take place. On comparison of spectral features in the enhanced photocurrent spectra to full-field electromagnetic simulations, the contribution of surface plasmon excitations is verified. These results open the door to the optimization of a wide variety of photochemical processes by leveraging the rapid advances in the field of plasmonics.
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