Details

Autor(en) / Beteiligte

• Zhang, Peng
• Kleiman-Shwarsctein, Alan
• Hu, Yong-Sheng
• Lefton, Jarrod
• Sharma, Sudhanshu
• Forman, Arnold J.
• McFarland, Eric

Titel

Oriented Ti doped hematite thin film as active photoanodes synthesized by facile APCVD

Ist Teil von

• Energy & environmental science, 2011-03, Vol.4 (3), p.1020-1028

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• To improve the optoelectronic properties of iron oxide as a photoelectrode, hematite ([small alpha]-Fe2O3) thin films were doped with titanium using atmospheric pressure chemical vapor deposition (APCVD) for synthesis. The films were prepared by pyrolysis of Fe(CO)5 and TiCl4 precursors on fluorine-doped tin oxide (FTO) substrates and found to have a polycrystalline morphology with faceted particulates [similar]20 to 50 nm in size with a preferred crystallographic growth along the [110] direction. The performance of the photoanodes was measured as a function of titanium concentration. A maximum efficiency was observed at [similar]0.8 atom% Ti in hematite. The Incident Photon-to-current Conversion Efficiency (IPCE) to hydrogen was measured in alkaline electrolyte. Under an applied bias of 0.6 V vs. Ag/AgCl at 400 nm the IPCE for water splitting in alkaline solution was found to be 27.2%, the highest efficiency reported for Ti doped hematite photoanodes. The IPCEs of the photoanode thin films at lower applied bias were further increased by calcination at 500 [degree]C and by use of glucose as an anolyte.