期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 4, 期 3, 页码 1020-1028出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ee00656d
关键词
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资金
- Department of Energy [DEFG36-05GO15040, DEFG36-03GO13062]
- National Science Foundation [DMR05-20415]
To improve the optoelectronic properties of iron oxide as a photoelectrode, hematite (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 to 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 to 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 degrees C and by use of glucose as an anolyte.
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