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Sun K, McDowell MT, Nielander AC, et al. Stable Solar-Driven Water Oxidation to O2(g) by Ni-Oxide-Coated Silicon Photoanodes. J Phys Chem Lett. 2015;6(4):592-8doi: 10.1021/jz5026195.
Sun, K., McDowell, M. T., Nielander, A. C., Hu, S., Shaner, M. R., Yang, F., Brunschwig, B. S., & Lewis, N. S. (2015). Stable Solar-Driven Water Oxidation to O2(g) by Ni-Oxide-Coated Silicon Photoanodes. The journal of physical chemistry letters, 6(4), 592-8. https://doi.org/10.1021/jz5026195
Sun, Ke, et al. "Stable Solar-Driven Water Oxidation to O2(g) by Ni-Oxide-Coated Silicon Photoanodes." The journal of physical chemistry letters vol. 6,4 (2015): 592-8. doi: https://doi.org/10.1021/jz5026195
Sun K, McDowell MT, Nielander AC, Hu S, Shaner MR, Yang F, Brunschwig BS, Lewis NS. Stable Solar-Driven Water Oxidation to O2(g) by Ni-Oxide-Coated Silicon Photoanodes. J Phys Chem Lett. 2015 Feb 19;6(4):592-8. doi: 10.1021/jz5026195. Epub 2015 Jan 29. PMID: 26262472.
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J Phys Chem Lett. 2015 Feb 19;6(4):592-8. doi: 10.1021/jz5026195. Epub 2015 Jan 29.

Stable Solar-Driven Water Oxidation to O2(g) by Ni-Oxide-Coated Silicon Photoanodes.

The journal of physical chemistry letters

Ke Sun, Matthew T McDowell, Adam C Nielander, Shu Hu, Matthew R Shaner, Fan Yang, Bruce S Brunschwig, Nathan S Lewis

Affiliations

  1. †Division of Chemistry and Chemical Engineering, ‡Joint Center for Artificial Photosynthesis, §Beckman Institute and Molecular Materials Research Center, and ?Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, United States.

PMID: 26262472 DOI: 10.1021/jz5026195

Abstract

Semiconductors with small band gaps (<2 eV) must be stabilized against corrosion or passivation in aqueous electrolytes before such materials can be used as photoelectrodes to directly produce fuels from sunlight. In addition, incorporation of electrocatalysts on the surface of photoelectrodes is required for efficient oxidation of H2O to O2(g) and reduction of H2O or H2O and CO2 to fuels. We report herein the stabilization of np(+)-Si(100) and n-Si(111) photoanodes for over 1200 h of continuous light-driven evolution of O2(g) in 1.0 M KOH(aq) by an earth-abundant, optically transparent, electrocatalytic, stable, conducting nickel oxide layer. Under simulated solar illumination and with optimized index-matching for proper antireflection, NiOx-coated np(+)-Si(100) photoanodes produced photocurrent-onset potentials of -180 ± 20 mV referenced to the equilibrium potential for evolution of O2(g), photocurrent densities of 29 ± 1.8 mA cm(-2) at the equilibrium potential for evolution of O2(g), and a solar-to-O2(g) conversion figure-of-merit of 2.1%.

Keywords: photoanodes; semiconductors; solar-fuels; water-splitting

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