Enhanced photoelectrolysis of water with photoanode Nb:SrTiO{sub 3}
- Ecomaterials Center, National Institute for Materials Science(NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
The photoelectrolysis of water has been investigated in a photoelectrochemical cell with the single-crystal photoanodes Nb:SrTiO{sub 3} (0 mol%, 0.07 mol%, and 0.69 mol%) and the electrolyte Na{sub 2}SO{sub 4} (0.1 M,pH=5.92). The Nb:SrTiO{sub 3} anodes (0.07 mol% and 0.69 mol%) show much higher photocurrent density than the pure SrTiO{sub 3} anode in several orders of magnitude. The incident photon to current conversion efficiencies at 298.2 nm and an applied potential 1.5 V (versus the saturated calomel electrode) for three Nb:SrTiO{sub 3} (0 mol%, 0.07 mol%, and 0.69 mol%) anodes are 0.92%, 15.67%, and 4.32%, respectively. The transmittance spectra of the Nb:SrTiO{sub 3} show an obvious optical absorption around 516 nm ({approx}2.4 eV). It is interpreted that two-photon process takes part in the charge transfer from the valence band to the conduction band through the intermediate states induced by Nb doping.
- OSTI ID:
- 20632695
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 85; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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