Abstract
Microstructured photoelectrode morphologies can advantageously facilitate integration of optically absorbing electrocatalysts with semiconducting light absorbers, to maintain low overpotentials for fuel production without producing a substantial loss in photocurrent density. We report herein the use of arrays of antireflective, high-aspect-ratio Si microcones (μ-cones), coupled with light-blocking Pt and Co-P catalysts, as photocathodes for H2 evolution. Thick (∼16 nm) layers of Pt or Co-P deposited onto Si μ-cone arrays yielded absolute light-limited photocurrent densities of ∼32 mA cm-2, representing a reduction in light-limited photocurrent density of 6% relative to bare Si μ-cone-array photocathodes, while maintaining high fill factors and low overpotentials for H2 production from 0.50 M H2SO4(aq). The Si μ-cone arrays were embedded in a flexible polymeric membrane and removed from the Si substrate, to yield flexible photocathodes consisting of polymer-embedded arrays of free-standing μ-cones that evolved hydrogen from 0.50 M H2SO4(aq).
| Original language | English |
|---|---|
| Pages (from-to) | 2217-2236 |
| Number of pages | 20 |
| Journal | Sustainable Energy and Fuels |
| Volume | 3 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Jan 1 2019 |
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ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Energy Engineering and Power Technology
Cite this
Integration of electrocatalysts with silicon microcone arrays for minimization of optical and overpotential losses during sunlight-driven hydrogen evolution. / Yalamanchili, Sisir; Kempler, Paul A.; Papadantonakis, Kimberly M.; Atwater, Harry A.; Lewis, Nathan S.
In: Sustainable Energy and Fuels, Vol. 3, No. 9, 01.01.2019, p. 2217-2236.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Integration of electrocatalysts with silicon microcone arrays for minimization of optical and overpotential losses during sunlight-driven hydrogen evolution
AU - Yalamanchili, Sisir
AU - Kempler, Paul A.
AU - Papadantonakis, Kimberly M.
AU - Atwater, Harry A.
AU - Lewis, Nathan S.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Microstructured photoelectrode morphologies can advantageously facilitate integration of optically absorbing electrocatalysts with semiconducting light absorbers, to maintain low overpotentials for fuel production without producing a substantial loss in photocurrent density. We report herein the use of arrays of antireflective, high-aspect-ratio Si microcones (μ-cones), coupled with light-blocking Pt and Co-P catalysts, as photocathodes for H2 evolution. Thick (∼16 nm) layers of Pt or Co-P deposited onto Si μ-cone arrays yielded absolute light-limited photocurrent densities of ∼32 mA cm-2, representing a reduction in light-limited photocurrent density of 6% relative to bare Si μ-cone-array photocathodes, while maintaining high fill factors and low overpotentials for H2 production from 0.50 M H2SO4(aq). The Si μ-cone arrays were embedded in a flexible polymeric membrane and removed from the Si substrate, to yield flexible photocathodes consisting of polymer-embedded arrays of free-standing μ-cones that evolved hydrogen from 0.50 M H2SO4(aq).
AB - Microstructured photoelectrode morphologies can advantageously facilitate integration of optically absorbing electrocatalysts with semiconducting light absorbers, to maintain low overpotentials for fuel production without producing a substantial loss in photocurrent density. We report herein the use of arrays of antireflective, high-aspect-ratio Si microcones (μ-cones), coupled with light-blocking Pt and Co-P catalysts, as photocathodes for H2 evolution. Thick (∼16 nm) layers of Pt or Co-P deposited onto Si μ-cone arrays yielded absolute light-limited photocurrent densities of ∼32 mA cm-2, representing a reduction in light-limited photocurrent density of 6% relative to bare Si μ-cone-array photocathodes, while maintaining high fill factors and low overpotentials for H2 production from 0.50 M H2SO4(aq). The Si μ-cone arrays were embedded in a flexible polymeric membrane and removed from the Si substrate, to yield flexible photocathodes consisting of polymer-embedded arrays of free-standing μ-cones that evolved hydrogen from 0.50 M H2SO4(aq).
UR - http://www.scopus.com/inward/record.url?scp=85071046463&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071046463&partnerID=8YFLogxK
U2 - 10.1039/c9se00294d
DO - 10.1039/c9se00294d
M3 - Article
AN - SCOPUS:85071046463
VL - 3
SP - 2217
EP - 2236
JO - Sustainable Energy and Fuels
JF - Sustainable Energy and Fuels
SN - 2398-4902
IS - 9
ER -