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Department of Physics

Staff profile

Publication details for Dr Kislon Voitchovsky

Warren, S.C., Voïtchovsky, K., Dotan, H., Leroy, C.M., Cornuz, M., Stellacci, F., Hébert, C., Rothschild, A. & Grätzel, M. (2013). Identifying champion nanostructures for solar water-splitting. Nature Materials 12(9): 842-849.

Author(s) from Durham

Abstract

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 α-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.