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

doi:10.1039/c5ee01786f

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

California Institute of Technology

Research output: Contribution to journal › Article › peer-review

173 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, η_STH, of 10.5% under 1 sun illumination, with stable performance for >40 h of continuous operation at an efficiency of η_STH > 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 language	English
Pages (from-to)	3166-3172
Number of pages	7
Journal	Energy and Environmental Science
Volume	8
Issue number	11
DOIs	https://doi.org/10.1039/c5ee01786f
Publication status	Published - Nov 2015

ASJC Scopus subject areas

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

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Verlage, E., Hu, S., Liu, R., Jones, R. J. R., Sun, K., Xiang, C., Lewis, N. S., & Atwater, H. A. (2015). 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. Energy and Environmental Science, 8(11), 3166-3172. https://doi.org/10.1039/c5ee01786f

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, 11.2015, p. 3166-3172.

Research output: Contribution to journal › Article › peer-review

Verlage, E, Hu, S, Liu, R, Jones, RJR, Sun, K, Xiang, C, Lewis, NS & Atwater, HA 2015, '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', Energy and Environmental Science, vol. 8, no. 11, pp. 3166-3172. https://doi.org/10.1039/c5ee01786f

Verlage E, Hu S, Liu R, Jones RJR, Sun K, Xiang C et al. 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. Energy and Environmental Science. 2015 Nov;8(11):3166-3172. https://doi.org/10.1039/c5ee01786f

Verlage, Erik ; Hu, Shu ; Liu, Rui ; Jones, Ryan J.R. ; Sun, Ke ; Xiang, Chengxiang ; Lewis, Nathan S. ; Atwater, Harry A. / 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. In: Energy and Environmental Science. 2015 ; Vol. 8, No. 11. pp. 3166-3172.

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