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Issue 1, 2017
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Gradient doping of phosphorus in Fe2O3 nanoarray photoanodes for enhanced charge separation

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Abstract

Hematite (α-Fe2O3) is a promising candidate for solar-to-hydrogen energy conversion. However, the low carrier mobility and extremely high charge recombination rate limit the practical application of hematite in solar water splitting. This paper describes the fabrication of a Fe2O3 photoanode with gradient incorporation of phosphorus (P) employing a facile dipping and annealing method to improve the charge separation for enhanced photoelectrochemical water oxidation. This gradient P incorporation increases the width of band bending over a large region in Fe2O3, which is crucial for promoting the charge separation efficiency in the bulk. Although both gradient and homogeneous P-incorporated Fe2O3 samples exhibit similar electrical conductivity, the Fe2O3 electrode with a gradient P concentration presents an additional charge separation effect. A photocurrent of ∼1.48 mA cm−2 is obtained at 1.23 V vs. reversible hydrogen electrode (vs. RHE) under air mass 1.5G illumination. Additionally, the H2O oxidation kinetics of Fe2O3 with gradient P incorporation was further improved upon loading cobalt phosphate as cocatalyst, reaching a photocurrent of ∼2.0 mA cm−2 at 1.23 V vs. RHE.

Graphical abstract: Gradient doping of phosphorus in Fe2O3 nanoarray photoanodes for enhanced charge separation

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Publication details

The article was received on 18 Aug 2016, accepted on 02 Oct 2016 and first published on 03 Oct 2016


Article type: Edge Article
DOI: 10.1039/C6SC03707K
Citation: Chem. Sci., 2017,8, 91-100
  • Open access: Creative Commons BY license
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    Gradient doping of phosphorus in Fe2O3 nanoarray photoanodes for enhanced charge separation

    Z. Luo, C. Li, S. Liu, T. Wang and J. Gong, Chem. Sci., 2017, 8, 91
    DOI: 10.1039/C6SC03707K

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