Comparison of the performance of cop-coated and pt-coated radial junction n+p-silicon microwire-array photocathodes for the sunlight-driven reduction of water to H2(g)

Christopher W. Roske, Eric J. Popczun, Brian Seger, Carlos G. Read, Thomas Pedersen, Ole Hansen, Peter C K Vesborg, Bruce S. Brunschwig, Raymond E. Schaak, Ib Chorkendorff, Harry B. Gray, Nathan S Lewis

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

The electrocatalytic performance for hydrogen evolution has been evaluated for radial-junction n+p-Si microwire (MW) arrays with Pt or cobalt phosphide, CoP, nanoparticulate catalysts in contact with 0.50 M H2SO4(aq). The CoP-coated (2.0 mg cm-2) n+p-Si MW photocathodes were stable for over 12 h of continuous operation and produced an open-circuit photovoltage (Voc) of 0.48 V, a light-limited photocurrent density (Jph) of 17 mA cm-2, a fill factor (ff) of 0.24, and an ideal regenerative cell efficiency (IRC) of 1.9% under simulated 1 Sun illumination. Pt-coated (0.5 mg cm-2) n+p-Si MW-array photocathodes produced Voc = 0.44 V, Jph = 14 mA cm-2, ff = 0.46, and = 2.9% under identical conditions. Thus, the MW geometry allows the fabrication of photocathodes entirely comprised of earth-abundant materials that exhibit performance comparable to that of devices that contain Pt.

Original languageEnglish
Pages (from-to)1679-1683
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume6
Issue number9
DOIs
Publication statusPublished - May 7 2015

Fingerprint

Photocathodes
photocathodes
Silicon
sunlight
p-n junctions
Water
silicon
water
phosphides
photovoltages
Cobalt
Photocurrents
Sun
photocurrents
Hydrogen
sun
cobalt
Lighting
Earth (planet)
illumination

Keywords

  • cobalt phosphide
  • hydrogen evolution
  • microwires
  • platinum
  • silicon
  • solar fuel

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Comparison of the performance of cop-coated and pt-coated radial junction n+p-silicon microwire-array photocathodes for the sunlight-driven reduction of water to H2(g). / Roske, Christopher W.; Popczun, Eric J.; Seger, Brian; Read, Carlos G.; Pedersen, Thomas; Hansen, Ole; Vesborg, Peter C K; Brunschwig, Bruce S.; Schaak, Raymond E.; Chorkendorff, Ib; Gray, Harry B.; Lewis, Nathan S.

In: Journal of Physical Chemistry Letters, Vol. 6, No. 9, 07.05.2015, p. 1679-1683.

Research output: Contribution to journalArticle

Roske, CW, Popczun, EJ, Seger, B, Read, CG, Pedersen, T, Hansen, O, Vesborg, PCK, Brunschwig, BS, Schaak, RE, Chorkendorff, I, Gray, HB & Lewis, NS 2015, 'Comparison of the performance of cop-coated and pt-coated radial junction n+p-silicon microwire-array photocathodes for the sunlight-driven reduction of water to H2(g)', Journal of Physical Chemistry Letters, vol. 6, no. 9, pp. 1679-1683. https://doi.org/10.1021/acs.jpclett.5b00495
Roske, Christopher W. ; Popczun, Eric J. ; Seger, Brian ; Read, Carlos G. ; Pedersen, Thomas ; Hansen, Ole ; Vesborg, Peter C K ; Brunschwig, Bruce S. ; Schaak, Raymond E. ; Chorkendorff, Ib ; Gray, Harry B. ; Lewis, Nathan S. / Comparison of the performance of cop-coated and pt-coated radial junction n+p-silicon microwire-array photocathodes for the sunlight-driven reduction of water to H2(g). In: Journal of Physical Chemistry Letters. 2015 ; Vol. 6, No. 9. pp. 1679-1683.
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