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 language | English |
|---|---|
| Pages (from-to) | 1679-1683 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 6 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 7 2015 |
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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 journal › Article
}
TY - JOUR
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 E.
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.
AB - 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.
KW - cobalt phosphide
KW - hydrogen evolution
KW - microwires
KW - platinum
KW - silicon
KW - solar fuel
UR - http://www.scopus.com/inward/record.url?scp=84929012031&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84929012031&partnerID=8YFLogxK
U2 - 10.1021/acs.jpclett.5b00495
DO - 10.1021/acs.jpclett.5b00495
M3 - Article
AN - SCOPUS:84929012031
VL - 6
SP - 1679
EP - 1683
JO - Journal of Physical Chemistry Letters
JF - Journal of Physical Chemistry Letters
SN - 1948-7185
IS - 9
ER -