Crystalline nickel, cobalt, and manganese antimonates as electrocatalysts for the chlorine evolution reaction
Abstract
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.
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.Attached Files
Supplemental Material - c8ee03676d1_si.pdf
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Additional details
- Eprint ID
- 93864
- Resolver ID
- CaltechAUTHORS:20190315-102720320
- Department of Energy (DOE)
- DE-SC0004993
- NSF Graduate Research Fellowship
- DGE-1144469
- Created
-
2019-03-15Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- JCAP, Kavli Nanoscience Institute