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Tin Oxide as a Protective Heterojunction with Silicon for Efficient Photoelectrochemical Water Oxidation in Strongly Acidic or Alkaline Electrolytes

Moreno-Hernandez, Ivan A. and Brunschwig, Bruce S. and Lewis, Nathan S. (2018) Tin Oxide as a Protective Heterojunction with Silicon for Efficient Photoelectrochemical Water Oxidation in Strongly Acidic or Alkaline Electrolytes. Advanced Energy Materials, 8 (24). Art. No. 1801155. ISSN 1614-6832. https://resolver.caltech.edu/CaltechAUTHORS:20180709-131016014

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Abstract

Photoelectrodes without a p–n junction are often limited in efficiency by charge recombination at semiconductor surfaces and slow charge transfer to electrocatalysts. This study reports that tin oxide (SnO_x) layers applied to n‐Si wafers after forming a thin chemically oxidized SiO_x layer can passivate the Si surface while producing ≈620 mV photovoltage under 100 mW cm^(−2) of simulated sunlight. The SnO_x layer makes ohmic contacts to Ni, Ir, or Pt films that act as precatalysts for the oxygen‐evolution reaction (OER) in 1.0 m KOH(aq) or 1.0 m H_2SO_4(aq). Ideal regenerative solar‐to‐O_2(g) efficiencies of 4.1% and 3.7%, respectively, are obtained in 1.0 m KOH(aq) with Ni or in 1.0 m H2_SO_4(aq) with Pt/IrO_x layers as OER catalysts. Stable photocurrents for >100 h are obtained for electrodes with patterned catalyst layers in both 1.0 m KOH(aq) and 1.0 m H_2SO_4(aq).


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1002/aenm.201801155DOIArticle
ORCID:
AuthorORCID
Moreno-Hernandez, Ivan A.0000-0001-6461-9214
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2018 WILEY‐VCH. Received: April 16, 2018. Revised: May 26, 2018. Version of Record online: 01 July 2018. This work was supported through the Office of Science of the U.S. Department of Energy (DOE) under award no. DE‐SC0004993 to the Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub. I.A.M.‐H. acknowledges a National Science Foundation Graduate Research Fellowship under Grant No. DGE‐1144469. The authors thank C. Garland for assistance with transmission‐electron microscopy. The authors declare no conflict of interest.
Group:JCAP
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
NSF Graduate Research FellowshipDGE‐1144469
Issue or Number:24
Record Number:CaltechAUTHORS:20180709-131016014
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180709-131016014
Official Citation:I. A. Moreno‐Hernandez, B. S. Brunschwig, N. S. Lewis, Adv. Energy Mater. 2018, 8, 1801155. https://doi.org/10.1002/aenm.201801155
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87651
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:09 Jul 2018 20:31
Last Modified:03 Oct 2019 19:58

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