Jump to main content
Jump to site search

Issue 9, 2019
Previous Article Next Article

Integration of electrocatalysts with silicon microcone arrays for minimization of optical and overpotential losses during sunlight-driven hydrogen evolution

Author affiliations

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).

Graphical abstract: Integration of electrocatalysts with silicon microcone arrays for minimization of optical and overpotential losses during sunlight-driven hydrogen evolution

Back to tab navigation

Supplementary files

Publication details

The article was received on 10 May 2019, accepted on 13 May 2019 and first published on 31 May 2019


Article type: Paper
DOI: 10.1039/C9SE00294D
Sustainable Energy Fuels, 2019,3, 2227-2236

  •   Request permissions

    Integration of electrocatalysts with silicon microcone arrays for minimization of optical and overpotential losses during sunlight-driven hydrogen evolution

    S. Yalamanchili, P. A. Kempler, Kimberly M. Papadantonakis, H. A. Atwater and N. S. Lewis, Sustainable Energy Fuels, 2019, 3, 2227
    DOI: 10.1039/C9SE00294D

Search articles by author

Spotlight

Advertisements