Stable solar-driven water oxidation to o2(G) by ni-oxide-coated silicon photoanodes

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

Research output: Contribution to journalArticle

83 Citations (Scopus)

Abstract

Semiconductors with small band gaps (2O 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%.

Original languageEnglish
Pages (from-to)592-598
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume6
Issue number4
DOIs
Publication statusPublished - Feb 19 2015

Fingerprint

Silicon
silicon oxides
Photocurrents
Oxides
Oxidation
oxidation
Nickel oxide
photocurrents
Water
water
Energy gap
Stabilization
nickel oxides
Lighting
Earth (planet)
Semiconductor materials
figure of merit
stabilization
illumination
conduction

Keywords

  • photoanodes
  • semiconductors
  • solar-fuels
  • water-splitting

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Stable solar-driven water oxidation to o2(G) by ni-oxide-coated silicon photoanodes. / Sun, Ke; McDowell, Matthew T.; Nielander, Adam C.; Hu, Shu; Shaner, Matthew R.; Yang, Fan; Brunschwig, Bruce S.; Lewis, Nathan S.

In: Journal of Physical Chemistry Letters, Vol. 6, No. 4, 19.02.2015, p. 592-598.

Research output: Contribution to journalArticle

Sun, K, McDowell, MT, Nielander, AC, Hu, S, Shaner, MR, Yang, F, Brunschwig, BS & Lewis, NS 2015, 'Stable solar-driven water oxidation to o2(G) by ni-oxide-coated silicon photoanodes', Journal of Physical Chemistry Letters, vol. 6, no. 4, pp. 592-598. https://doi.org/10.1021/jz5026195
Sun, Ke ; McDowell, Matthew T. ; Nielander, Adam C. ; Hu, Shu ; Shaner, Matthew R. ; Yang, Fan ; Brunschwig, Bruce S. ; Lewis, Nathan S. / Stable solar-driven water oxidation to o2(G) by ni-oxide-coated silicon photoanodes. In: Journal of Physical Chemistry Letters. 2015 ; Vol. 6, No. 4. pp. 592-598.
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