Crystalline nickel manganese antimonate as a stable water-oxidation catalyst in aqueous 1.0 M H2SO4

Journal Article (Journal Article)

Water oxidation is a required half-reaction for electrochemical water splitting. To date, the only well-established active oxygen-evolution catalysts stable under operating conditions and at rest in acidic aqueous media contain Ru or Ir, two of the scarcest non-radioactive elements on Earth. We report herein a nickel-manganese antimonate electrocatalyst with a rutile-type crystal structure that requires an initial voltammetric overpotential of 672 ± 9 mV to catalyze the oxidation of water to O2(g) at a rate corresponding to 10 mA cm-2 of current density when operated in contact with 1.0 M sulfuric acid. Under galvanostatic control, the overpotential initially rose from 670 mV but was then stable at 735 ± 10 mV for 168 h of continuous operation at 10 mA cm-2. We additionally provide an in-depth evaluation of the stability of the nickel-manganese antimonate electrocatalyst, including elemental characterization of the surface, bulk, and electrolyte before and after electrochemical operation.

Full Text

Duke Authors

Cited Authors

  • Moreno-Hernandez, IA; Macfarland, CA; Read, CG; Papadantonakis, KM; Brunschwig, BS; Lewis, NS

Published Date

  • October 1, 2017

Published In

Volume / Issue

  • 10 / 10

Start / End Page

  • 2103 - 2108

Electronic International Standard Serial Number (EISSN)

  • 1754-5706

International Standard Serial Number (ISSN)

  • 1754-5692

Digital Object Identifier (DOI)

  • 10.1039/c7ee01486d

Citation Source

  • Scopus