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Title: Photoelectrochemical water splitting and hydrogen generation by a spontaneously formed InGaN nanowall network

We investigate photoelectrochemical water splitting by a spontaneously formed In-rich InGaN nanowall network, combining the material of choice with the advantages of surface texturing for light harvesting by light scattering. The current density for the InGaN-nanowalls-photoelectrode at zero voltage versus the Ag/AgCl reference electrode is 3.4 mA cm{sup −2} with an incident-photon-to-current-conversion efficiency (IPCE) of 16% under 350 nm laser illumination with 0.075 W·cm{sup −2} power density. In comparison, the current density for a planar InGaN-layer-photoelectrode is 2 mA cm{sup −2} with IPCE of 9% at zero voltage versus the Ag/AgCl reference electrode. The H{sub 2} generation rates at zero externally applied voltage versus the Pt counter electrode per illuminated area are 2.8 and 1.61 μmol·h{sup −1}·cm{sup −2} for the InGaN nanowalls and InGaN layer, respectively, revealing ∼57% enhancement for the nanowalls.
Authors:
; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. ISOM Institute for Systems Based on Optoelectronics and Microtechnology, ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid (Spain)
  2. Department of Physics, Government College University, Faisalabad (Pakistan)
  3. Department of Chemistry, Government College University, Faisalabad (Pakistan)
  4. Department of Science and Technology (ITN), Campus Norrköping, Linköping University, 60174 Norrköping (Sweden)
Publication Date:
OSTI Identifier:
22300087
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CONVERSION; CURRENT DENSITY; EFFICIENCY; ELECTROCHEMISTRY; GALLIUM COMPOUNDS; ILLUMINANCE; INDIUM COMPOUNDS; INTERSTITIAL HYDROGEN GENERATION; LASER RADIATION; LAYERS; LIGHT SCATTERING; NANOSTRUCTURES; NITROGEN COMPOUNDS; PHOTONS; POWER DENSITY; SILVER CHLORIDES; SURFACES; THERMOCHEMICAL PROCESSES; VISIBLE RADIATION; WATER