Abstract
Planar and three-dimensionally structured p-Si devices, consisting of an electrodeposited Co-P catalyst on arrays of Si microwires or Si micropyramids, were used as photocathodes for solar-driven hydrogen evolution in 0.50 M H2SO4(aq) to assess the effects of electrode structuring on parasitic absorption by the catalyst. Without the use of an emitter layer, p-Si/Co-P microwire arrays produced a photocurrent density of -10 mA cm-2 at potentials that were 130 mV more positive than those of optimized planar p-Si/Co-P devices. Champion p-Si/Co-P microwire array devices exhibited ideal regenerative cell solar-to-hydrogen efficiencies of >2.5% and were primarily limited by the photovoltage of the p-Si/Co-P junction. The vertical sidewalls of the Si microwire photoelectrodes thus minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.
| Original language | English |
|---|---|
| Pages (from-to) | 612-617 |
| Number of pages | 6 |
| Journal | ACS Energy Letters |
| Volume | 3 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 9 2018 |
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ASJC Scopus subject areas
- Chemistry (miscellaneous)
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
- Materials Chemistry
Cite this
Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co-P Catalyst Films on Structured p-Si Photocathodes. / Kempler, Paul A.; Gonzalez, Miguel A.; Papadantonakis, Kimberly M.; Lewis, Nathan S.
In: ACS Energy Letters, Vol. 3, No. 3, 09.03.2018, p. 612-617.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Hydrogen Evolution with Minimal Parasitic Light Absorption by Dense Co-P Catalyst Films on Structured p-Si Photocathodes
AU - Kempler, Paul A.
AU - Gonzalez, Miguel A.
AU - Papadantonakis, Kimberly M.
AU - Lewis, Nathan S
PY - 2018/3/9
Y1 - 2018/3/9
N2 - Planar and three-dimensionally structured p-Si devices, consisting of an electrodeposited Co-P catalyst on arrays of Si microwires or Si micropyramids, were used as photocathodes for solar-driven hydrogen evolution in 0.50 M H2SO4(aq) to assess the effects of electrode structuring on parasitic absorption by the catalyst. Without the use of an emitter layer, p-Si/Co-P microwire arrays produced a photocurrent density of -10 mA cm-2 at potentials that were 130 mV more positive than those of optimized planar p-Si/Co-P devices. Champion p-Si/Co-P microwire array devices exhibited ideal regenerative cell solar-to-hydrogen efficiencies of >2.5% and were primarily limited by the photovoltage of the p-Si/Co-P junction. The vertical sidewalls of the Si microwire photoelectrodes thus minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.
AB - Planar and three-dimensionally structured p-Si devices, consisting of an electrodeposited Co-P catalyst on arrays of Si microwires or Si micropyramids, were used as photocathodes for solar-driven hydrogen evolution in 0.50 M H2SO4(aq) to assess the effects of electrode structuring on parasitic absorption by the catalyst. Without the use of an emitter layer, p-Si/Co-P microwire arrays produced a photocurrent density of -10 mA cm-2 at potentials that were 130 mV more positive than those of optimized planar p-Si/Co-P devices. Champion p-Si/Co-P microwire array devices exhibited ideal regenerative cell solar-to-hydrogen efficiencies of >2.5% and were primarily limited by the photovoltage of the p-Si/Co-P junction. The vertical sidewalls of the Si microwire photoelectrodes thus minimized effects due to parasitic absorption at high loadings of catalyst for device structures with or without emitters.
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U2 - 10.1021/acsenergylett.8b00034
DO - 10.1021/acsenergylett.8b00034
M3 - Article
VL - 3
SP - 612
EP - 617
JO - ACS Energy Letters
JF - ACS Energy Letters
SN - 2380-8195
IS - 3
ER -