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Functional integration of Ni–Mo electrocatalysts with Si microwire array photocathodes to simultaneously achieve high fill factors and light-limited photocurrent densities for solar-driven hydrogen evolution

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c5ee01076d· OSTI ID:1634094
 [1];  [2];  [3];  [4]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); California Institute of Technology, Pasadena, CA
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); Univ. of Illinois at Urbana-Champaign, IL (United States). Beckman Inst. for Advanced Science and Technology; Kavli Energy NanoScience Institute, Berkeley, CA (United States)
  4. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)

An n+p-Si microwire array coupled with a two-layer catalyst film consisting of Ni–Mo nanopowder and TiO2 light-scattering nanoparticles has been used to simultaneously achieve high fill factors and light-limited photocurrent densities from photocathodes that produce H2(g) directly from sunlight and water. The TiO2 layer scattered light back into the Si microwire array, while optically obscuring the underlying Ni–Mo catalyst film. In turn, the Ni–Mo film had a mass loading sufficient to produce high catalytic activity, on a geometric area basis, for the hydrogen-evolution reaction. The best-performing microwire array devices prepared in this work exhibited short-circuit photocurrent densities of -14.3 mA cm-2, photovoltages of 420 mV, and a fill factor of 0.48 under 1 Sun of simulated solar illumination, whereas the equivalent planar Ni–Mo-coated Si device, without TiO2 scatterers, exhibited negligible photocurrent due to complete light blocking by the Ni–Mo catalyst layer.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; National Science Foundation (NSF) Powering the Planet Center for Chemical Innovation
Grant/Contract Number:
SC0004993
OSTI ID:
1634094
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 10 Vol. 8; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Engineering MoSx/Ti/InP Hybrid Photocathode for Improved Solar Hydrogen Production journal July 2016

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