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Highly self-diffused Sn doping in α-Fe2O3 Nanorod Photoanodes Initiated from β-FeOOH Nanorod/FTO by Hydrogen Treatment for Solar Water Oxidation

Abstract

In this study, we present an advanced strategy of the low-temperature hydrogen annealing combined with high- temperature quenching in air for activating α-Fe2O3 nanorod photoanodes to boost the photoelectrochemical performance. We report that various low-temperature annealing conditions (340, 360, 380, and 400 °C) under hydrogen gas flow convert β-FeOOH into magnetite (Fe3O4) as well as introduce Sn4+ diffusion from FTO substrates to its surface. Further, high-temperature quenching (800 °C) resulted in the phase change of magnetite (Fe3O4) into hematite (α-Fe2O3) and self Sn4+ doping into the hematite lattice. Thus, the hydrogen-assisted thermally activated hematite photoanode achieved the photocurrent density of 1.35 mA/cm2 at 1.23 V vs. RHE and 1.91 mA/cm2 at 1.4 V vs. RHE, which is 70% and 80% higher than that of directly quenched hematite at 800 °C. These combined two step strategies provide new insight into the highly Sn-self doping for α-Fe2O3 photoanodes and allow for further development of more efficient solar water oxidation systems.

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Publication details

The article was received on 07 Sep 2018, accepted on 07 Nov 2018 and first published on 10 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07277A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Highly self-diffused Sn doping in α-Fe2O3 Nanorod Photoanodes Initiated from β-FeOOH Nanorod/FTO by Hydrogen Treatment for Solar Water Oxidation

    H. Ma, M. A. Mahadik, J. W. Park, M. Kumar, H. Chung, W. Chae, G. Kong, H. H. Lee, S. H. Choi and J. S. Jang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07277A

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