Photoelectrolysis of water at high current density: Use of ultraviolet laser excitation

Andrew Bruce Bocarsly, Jeffrey M. Bolts, Phillip G. Cummins, Mark S. Wrighton

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


The behavior of TiO2 and SrTiO3 photoanodes in cells for the photoelectrolysis of H2O has been investigated for high-intensity 351 364-nm excitation from an Ar ion laser. Intensities up to 380 W/cm2 have been used. For TiO2 a small amount of surface decomposition is found after irradiation at high intensity, whereas SrTiO 3 undergoes no detectable changes. Current-voltage properties for both electrodes are essentially independent of light intensity up to the level of 380 W/cm2, and there is little if any change in quantum efficiency for electron flow. Photocurrent densities have been shown to exceed 5 A/cm 2 for O2 evolution. Data show that the energy storage rate associated with the SrTiO3 photoelectrolysis can exceed 30 W/cm 2; this represents the highest demonstrated rate of sustained optical to chemical energy conversion.

Original languageEnglish (US)
Pages (from-to)568-570
Number of pages3
JournalApplied Physics Letters
Issue number9
StatePublished - 1977

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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