期刊
NATURE MATERIALS
卷 12, 期 9, 页码 842-849出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT3684
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资金
- European Commission (Nanostructured Photoelectrodes for Energy Conversion, NanoPEC) [227179]
- Swiss Federal Office for Energy (PECHouse Competence Center) [152933]
- European Research Council (ERC) [(ARC) 247404 'Mesolight']
Charge transport in nanoparticle-based materials underlies many emerging energy-conversion technologies, yet assessing the impact of nanometre-scale structure on charge transport across micrometre-scale distances remains a challenge. Here we develop an approach for correlating the spatial distribution of crystalline and current-carrying domains in entire nanoparticle aggregates. We apply this approach to nanoparticle-based alpha-Fe2O3 electrodes that are of interest in solar-to-hydrogen energy conversion. In correlating structure and charge transport with nanometre resolution across micrometre-scale distances, we have identified the existence of champion nanoparticle aggregates that are most responsible for the high photoelectrochemical activity of the present electrodes. Indeed, when electrodes are fabricated with a high proportion of these champion nanostructures, the electrodes achieve the highest photocurrent of any metal oxide photoanode for photoelectrochemical water-splitting under 100 mW cm(-2) air mass 1.5 global sunlight.
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