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Issue 36, 2017
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High temperature activation of hematite nanorods for sunlight driven water oxidation reaction

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Abstract

Here we show that chlorine species originating from commonly used iron precursors annihilate the hematite nanorod photocurrent by providing recombination pathways. Although hematite nanorod films could be obtained by thermal decomposition of the iron oxyhydroxide phase (β-FeOOH), indistinguishable photocurrent responses under dark and sunlight irradiation conditions were observed until the nanorods were annealed (activated) at 750 °C. The annealing led to the elimination of observable chlorine species and allowed photocurrent responses of 1.3 mA cm−2 at 1.23 V vs. RHE, which is comparable to the best results found in the literature, suggesting that residual chlorine species from the synthesis can act as electron traps and recombination sites for photogenerated holes.

Graphical abstract: High temperature activation of hematite nanorods for sunlight driven water oxidation reaction

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Publication details

The article was received on 18 Jul 2017, accepted on 24 Aug 2017 and first published on 24 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP04827K
Citation: Phys. Chem. Chem. Phys., 2017,19, 25025-25032
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    High temperature activation of hematite nanorods for sunlight driven water oxidation reaction

    N. M. Ito, W. M. Carvalho, D. N. F. Muche, R. H. R. Castro, G. M. Dalpian and F. L. Souza, Phys. Chem. Chem. Phys., 2017, 19, 25025
    DOI: 10.1039/C7CP04827K

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