A monolithically integrated, intrinsically safe, 10% efficient, solar-driven water-splitting system based on active, stable earth-abundant electrocatalysts in conjunction with tandem III-V light absorbers protected by amorphous TiO2 films

Erik Verlage, Shu Hu, Rui Liu, Ryan J R Jones, Ke Sun, Chengxiang Xiang, Nathan S Lewis, Harry A. Atwater

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

A monolithically integrated device consisting of a tandem-junction GaAs/InGaP photoanode coated by an amorphous TiO2 stabilization layer, in conjunction with Ni-based, earth-abundant active electrocatalysts for the hydrogen-evolution and oxygen-evolution reactions, was used to effect unassisted, solar-driven water splitting in 1.0 M KOH(aq). When connected to a Ni-Mo-coated counterelectrode in a two-electrode cell configuration, the TiO2-protected III-V tandem device exhibited a solar-to-hydrogen conversion efficiency, ηSTH, of 10.5% under 1 sun illumination, with stable performance for >40 h of continuous operation at an efficiency of ηSTH > 10%. The protected tandem device also formed the basis for a monolithically integrated, intrinsically safe solar-hydrogen prototype system (1 cm2) driven by a NiMo/GaAs/InGaP/TiO2/Ni structure. The intrinsically safe system exhibited a hydrogen production rate of 0.81 μL s-1 and a solar-to-hydrogen conversion efficiency of 8.6% under 1 sun illumination in 1.0 M KOH(aq), with minimal product gas crossover while allowing for beneficial collection of separate streams of H2(g) and O2(g).

Original languageEnglish
Pages (from-to)3166-3172
Number of pages7
JournalEnergy and Environmental Science
Volume8
Issue number11
DOIs
Publication statusPublished - Nov 1 2015

Fingerprint

Electrocatalysts
Amorphous films
Hydrogen
Earth (planet)
hydrogen
Water
Sun
Conversion efficiency
Lighting
water
Hydrogen production
Stabilization
Gases
Oxygen
electrode
stabilization
Electrodes
oxygen
gas
gallium arsenide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution
  • Nuclear Energy and Engineering

Cite this

A monolithically integrated, intrinsically safe, 10% efficient, solar-driven water-splitting system based on active, stable earth-abundant electrocatalysts in conjunction with tandem III-V light absorbers protected by amorphous TiO2 films. / Verlage, Erik; Hu, Shu; Liu, Rui; Jones, Ryan J R; Sun, Ke; Xiang, Chengxiang; Lewis, Nathan S; Atwater, Harry A.

In: Energy and Environmental Science, Vol. 8, No. 11, 01.11.2015, p. 3166-3172.

Research output: Contribution to journalArticle

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