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

Journal Article


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. © 2013 The Royal Society of Chemistry.

Authors


  •   Wang, Lei (external author)
  •   Lee, Chong-Yong
  •   Schmuki, Patrik (external author)

Publication Date


  • 2013

Geographic Focus


Citation


  • Wang, L., Lee, C. & Schmuki, P. (2013). Solar water splitting: Preserving the beneficial small feature size in porous α-Fe2O3 photoelectrodes during annealing. Journal of Materials Chemistry A, 1 (2), 212-215.

Scopus Eid


  • 2-s2.0-84875255460

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1681

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 212

End Page


  • 215

Volume


  • 1

Issue


  • 2

Place Of Publication


  • United Kingdom

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. © 2013 The Royal Society of Chemistry.

Authors


  •   Wang, Lei (external author)
  •   Lee, Chong-Yong
  •   Schmuki, Patrik (external author)

Publication Date


  • 2013

Geographic Focus


Citation


  • Wang, L., Lee, C. & Schmuki, P. (2013). Solar water splitting: Preserving the beneficial small feature size in porous α-Fe2O3 photoelectrodes during annealing. Journal of Materials Chemistry A, 1 (2), 212-215.

Scopus Eid


  • 2-s2.0-84875255460

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1681

Has Global Citation Frequency


Number Of Pages


  • 3

Start Page


  • 212

End Page


  • 215

Volume


  • 1

Issue


  • 2

Place Of Publication


  • United Kingdom