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Crystalline nickel, cobalt, and manganese antimonates as electrocatalysts for the chlorine evolution reaction

Moreno-Hernandez, Ivan A. and Brunschwig, Bruce S. and Lewis, Nathan S. (2019) Crystalline nickel, cobalt, and manganese antimonates as electrocatalysts for the chlorine evolution reaction. Energy and Environmental Science, 12 (4). pp. 1241-1248. ISSN 1754-5692. doi:10.1039/c8ee03676d.

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The chlorine-evolution reaction (CER) is a common, commercially valuable electrochemical reaction, and is practiced at industrial scale globally. A precious metal solid solution of RuO_2 or IrO_2 with TiO_2 is the predominant electrocatalyst for the CER. Herein we report that materials comprised only of non-precious metal elements, specifically crystalline transition-metal antimonates (TMAs) such as NiSb_2O_x, CoSb_2O_x, and MnSb_2O_x, are moderately active, stable catalysts for the electrochemical oxidation of chloride to chlorine under conditions relevant to the commercial chlor-alkali process. Specifically, CoSb2Ox exhibited a galvanostatic potential of 1.804 V vs. NHE at 100 mA cm^(−2) of Cl_2(g) production from aqueous pH = 2.0, 4.0 M NaCl after 250 h of operation. Studies of the bulk and surface of the electrocatalyst and the composition of the electrolyte before and after electrolysis indicated minimal changes in the surface structure and intrinsic activity of CoSb_2O_x as a result of Cl2(g) evolution under these conditions.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Moreno-Hernandez, Ivan A.0000-0001-6461-9214
Brunschwig, Bruce S.0000-0002-6135-6727
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2019 The Royal Society of Chemistry. Received 19th December 2018, Accepted 7th March 2019, First published on 12th March 2019. 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. We thank Dr K. Papadantonakis for assistance with editing the manuscript, and C. Finke for assistance with iodometric measurements. There are no conflicts to declare.
Group:JCAP, Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0004993
NSF Graduate Research FellowshipDGE-1144469
Issue or Number:4
Record Number:CaltechAUTHORS:20190315-102720320
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93864
Deposited By: Tony Diaz
Deposited On:15 Mar 2019 17:47
Last Modified:16 Nov 2021 17:01

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