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Issue 2, 2013
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Solar water splitting: preserving the beneficial small feature size in porous α-Fe2O3 photoelectrodes during annealing

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Abstract

We prepared mesoporous α-Fe2O3/FTO electrodes by a simple anodic precipitation and annealing method. The classic problem is that when annealed in air at >500 °C, the individual particle size increases from ≈20 nm to 40–60 nm. This grain growth is highly detrimental for the water splitting efficiency. In the present work we show that grain coarsening can efficiently be prevented by a two-step annealing method in Ar, leading to photocurrent densities for such electrodes (obtained in 1 M KOH solution) of up to 2.6 mA cm−2 at 1.6 V vs. RHE under AM 1.5 100 mW cm−2 illumination, which is significantly higher than 1.5 mA cm−2 for conventionally annealed samples.

Graphical abstract: Solar water splitting: preserving the beneficial small feature size in porous α-Fe2O3 photoelectrodes during annealing

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Publication details

The article was received on 25 Sep 2012, accepted on 02 Nov 2012 and first published on 05 Nov 2012


Article type: Communication
DOI: 10.1039/C2TA00431C
Citation: J. Mater. Chem. A, 2013,1, 212-215
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    Solar water splitting: preserving the beneficial small feature size in porous α-Fe2O3 photoelectrodes during annealing

    L. Wang, C. Lee and P. Schmuki, J. Mater. Chem. A, 2013, 1, 212
    DOI: 10.1039/C2TA00431C

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