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 Edward Schaak, Ib Chorkendorff, Harry B. Gray, Nathan S. Lewis

Research output: Contribution to journalArticle

40 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 (US)
Pages (from-to)1679-1683
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume6
Issue number9
DOIs
StatePublished - 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

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Roske, Christopher W. ; Popczun, Eric J. ; Seger, Brian ; Read, Carlos G. ; Pedersen, Thomas ; Hansen, Ole ; Vesborg, Peter C.K. ; Brunschwig, Bruce S. ; Schaak, Raymond Edward ; 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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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.",
author = "Roske, {Christopher W.} and Popczun, {Eric J.} and Brian Seger and Read, {Carlos G.} and Thomas Pedersen and Ole Hansen and Vesborg, {Peter C.K.} and Brunschwig, {Bruce S.} and Schaak, {Raymond Edward} and Ib Chorkendorff and Gray, {Harry B.} and Lewis, {Nathan S.}",
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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

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 Edward; 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

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T1 - 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)

AU - Roske, Christopher W.

AU - Popczun, Eric J.

AU - Seger, Brian

AU - Read, Carlos G.

AU - Pedersen, Thomas

AU - Hansen, Ole

AU - Vesborg, Peter C.K.

AU - Brunschwig, Bruce S.

AU - Schaak, Raymond Edward

AU - Chorkendorff, Ib

AU - Gray, Harry B.

AU - Lewis, Nathan S.

PY - 2015/5/7

Y1 - 2015/5/7

N2 - 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.

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