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Issue 10, 2012
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In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

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Abstract

The spectra and dynamics of photogenerated electrons and holes in excited hematite (α-Fe2O3) electrodes are investigated by transient absorption (from visible to infrared and from femto- to micro-seconds), bias-dependent differential absorption and Stark spectroscopy. Comparison of results from these techniques enables the assignment of the spectral signatures of photogenerated electrons and holes. Under the pulse illumination conditions of transient absorption (TA) measurement, the absorbed photon to electron conversion efficiency (APCE) of the films at 1.43 V (vs. reversible hydrogen electrode, RHE) is 0.69%, significantly lower than that at AM 1.5. TA kinetics shows that under these conditions, >98% of the photogenerated electrons and holes have recombined by 6 μs. Although APCE increases with more positive bias (from 0.90 to 1.43 V vs. RHE), the kinetics of holes up to 6 μs show negligible change, suggesting that the catalytic activity of the films is determined by holes with longer lifetimes.

Graphical abstract: In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

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The article was received on 27 Jun 2012, accepted on 09 Aug 2012 and first published on 09 Aug 2012


Article type: Communication
DOI: 10.1039/C2EE22681B
Citation: Energy Environ. Sci., 2012,5, 8923-8926
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    In situ probe of photocarrier dynamics in water-splitting hematite (α-Fe2O3) electrodes

    Z. Huang, Y. Lin, X. Xiang, W. Rodríguez-Córdoba, K. J. McDonald, K. S. Hagen, K. Choi, B. S. Brunschwig, D. G. Musaev, C. L. Hill, D. Wang and T. Lian, Energy Environ. Sci., 2012, 5, 8923
    DOI: 10.1039/C2EE22681B

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