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

Ivan A. Moreno-Hernandez, Bruce S. Brunschwig, Nathan S Lewis

Research output: Contribution to journalArticle

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 2 O x , CoSb 2 O x , and MnSb 2 O x , are moderately active, stable catalysts for the electrochemical oxidation of chloride to chlorine under conditions relevant to the commercial chlor-alkali process. Specifically, CoSb 2 O x 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 2 O x as a result of Cl 2 (g) evolution under these conditions.

Original languageEnglish
Pages (from-to)1241-1248
Number of pages8
JournalEnergy and Environmental Science
Volume12
Issue number4
DOIs
Publication statusPublished - Apr 1 2019

Fingerprint

Electrocatalysts
Chlorine
Manganese
Cobalt
Nickel
cobalt
chlorine
manganese
nickel
Crystalline materials
Electrochemical oxidation
precious metal
Alkalies
transition element
Precious metals
solid solution
Electrolysis
Surface structure
Chemical elements
electrolyte

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

Cite this

Crystalline nickel, cobalt, and manganese antimonates as electrocatalysts for the chlorine evolution reaction. / Moreno-Hernandez, Ivan A.; Brunschwig, Bruce S.; Lewis, Nathan S.

In: Energy and Environmental Science, Vol. 12, No. 4, 01.04.2019, p. 1241-1248.

Research output: Contribution to journalArticle

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