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Crystalline Nickel, Cobalt, and Manganese Antimonates as Electrocatalysts for the Chlorine Evolution Reaction

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/c8ee03676d· OSTI ID:1610784
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 RuO2 or IrO2 with TiO2 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 NiSb2Ox, CoSb2Ox, and MnSb2Ox, 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 Cl2(g) production from aqueous pH = 2.0, 4.0 M NaCl after 250 h of operation. In this work, 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 CoSb2Ox as a result of Cl2(g) evolution under these conditions.
Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0004993
OSTI ID:
1610784
Alternate ID(s):
OSTI ID: 1500144
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 4 Vol. 12; ISSN EESNBY; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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