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Mixed-Metal Semiconductor Anodes for Electrochemical Water Splitting and Reactive Chlorine Species Generation: Implications for Electrochemical Wastewater Treatment

Ryu, Su Young and Hoffmann, Michael R. (2016) Mixed-Metal Semiconductor Anodes for Electrochemical Water Splitting and Reactive Chlorine Species Generation: Implications for Electrochemical Wastewater Treatment. Catalysts, 6 (4). Art. No. 59. ISSN 2073-4344. http://resolver.caltech.edu/CaltechAUTHORS:20160420-163223131

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Abstract

A procedure for the preparation of semiconductor anodes using mixed-metal oxides bound together and protected with a TiO_2 nanoglue has been developed and tested in terms of the relative efficiencies of the oxygen evolution (OER), the reactive chlorine species evolution (RCS), and the hydrogen evolution (HER) reactions. The composition of the first anode is a Ti metal substrate coated with IrTaO_x and overcoated with TiO_2 (P_(25)) that was mixed with TiO_2 nanogel, while the second anode consists of a Ti metal substrate coated with IrTaO_x and an over-coating layer of La-doped sodium tantalate, NaTaO_3:La. The experimental efficiencies for water splitting ranged from 62.4% to 67.5% for H_2 evolution and 40.6% to 60.0% for O_2 evolution. The corresponding over-potentials for the Ti/IrTa-TiO_2 and Ti/IrTa-NaTaO_3:La anodes coupled with stainless steel cathodes of the same dimensions were determined to be 437 mV and 367 mV for the OER, respectively, and 239 mV and 205 mV for RCS, respectively. The preparation procedure described herein should allow for easier production of large-surface area anodes at lower costs than standard methods.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3390/catal6040059DOIArticle
http://www.mdpi.com/2073-4344/6/4/59PublisherArticle
http://www.mdpi.com/2073-4344/6/4/59/s1PublisherSupplementary Material
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). Received: 16 February 2016 / Revised: 25 March 2016 / Accepted: 31 March 2016 / Published: 20 April 2016. Academic Editors: Bunsho Ohtani and Jae Sung Lee. (This article belongs to the Special Issue Photocatalytic Water Splitting) This study is supported by Bill & Melinda Gates Foundation (BMGF RTTC Grant No. 1105724). The authors are grateful to Byung-Kuk Yoo (Caltech) for his support for TEM measurement. Author Contributions: Su Young Ryu performed the experiments and data analysis and she wrote the initial draft of the paper. Michael Hoffmann was the principal investigator of the project; he edited the draft manuscript for publication. The authors declare no conflict of interest.
Funders:
Funding AgencyGrant Number
Bill and Melinda Gates Foundation1105724
Subject Keywords:a facile methodology for electrode fabrication; catalysts; water splitting; wastewater treatment
Record Number:CaltechAUTHORS:20160420-163223131
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160420-163223131
Official Citation:Ryu, S.Y.; Hoffmann, M.R. Mixed-Metal Semiconductor Anodes for Electrochemical Water Splitting and Reactive Chlorine Species Generation: Implications for Electrochemical Wastewater Treatment. Catalysts 2016, 6, 59.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66342
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:21 Apr 2016 14:34
Last Modified:21 Apr 2016 14:34

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