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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 TiO_2 Films

Verlage, Erik and Hu, Shu and Liu, Rui and Jones, Ryan J. R. and Sun, Ke and Xiang, Chengxiang and Lewis, Nathan and Atwater, Harry A., Jr. (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 TiO_2 Films. Energy and Environmental Science, 8 (11). pp. 3166-3172. ISSN 1754-5692. http://resolver.caltech.edu/CaltechAUTHORS:20150825-164619530

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Abstract

A monolithically integrated device consisting of a tandem-junction GaAs/InGaP photoanode coated by an amorphous TiO_2 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 TiO_2-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 cm^2) driven by a NiMo/GaAs/InGaP/TiO_2/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 H_2(g) and O_2(g).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/C5EE01786FDOIArticle
http://pubs.rsc.org/en/content/articlelanding/2015/ee/c5ee01786fPublisherArticle
http://www.rsc.org/suppdata/c5/ee/c5ee01786f/c5ee01786f1.pdfPublisherSupplementary Information
http://www.rsc.org/suppdata/c5/ee/c5ee01786f/c5ee01786f2.mp4PublisherSupplementary Movie
ORCID:
AuthorORCID
Lewis, Nathan0000-0001-5245-0538
Atwater, Harry A., Jr.0000-0001-9435-0201
Additional Information:© 2015 Royal Society of Chemistry. Received 09 Jun 2015, Accepted 17 Aug 2015, First published online 18 Aug 2015. This material is based upon work performed by the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub, supported through the Office of Science of the U.S. Department of Energy under Award Number DE-SC0004993. This work was additionally supported by the Gordon and Betty Moore Foundation under Award No. GBMF1225.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
Gordon and Betty Moore FoundationGBMF1225
Record Number:CaltechAUTHORS:20150825-164619530
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150825-164619530
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59897
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:26 Aug 2015 00:00
Last Modified:04 Dec 2015 18:18

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