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A Functionally Stable Manganese Oxide Oxygen Evolution Catalyst in Acid

Huynh, Michael, Bediako, D. Kwabena, Nocera, Daniel G.·2014·Journal of the American Chemical Society

Abstract

First-row metals have been a target for the development of oxygen evolution reaction (OER) catalysts because they comprise noncritical elements. We now report a comprehensive electrochemical characterization of manganese oxide (MnOx) over a wide pH range, and establish MnOx as a functionally stable OER catalyst owing to self-healing, is derived from MnOx redeposition that offsets catalyst dissolution during turnover. To study this process in detail, the oxygen evolution mechanism of MnOx was investigated electrokinetically over a pH range spanning acidic, neutral, and alkaline conditions. In the alkaline pH regime, a ∼60 mV/decade Tafel slope and inverse first-order dependence on proton concentration were observed, whereas the OER acidic pH regime exhibited a quasi-infinite Tafel slope and zeroth-order dependence on proton concentration. The results reflect two competing mechanisms: a one-electron one-proton PCET pathway that is dominant under alkaline conditions and a Mn(3+) disproportionation process, which predominates under acidic conditions. Reconciling the rate laws of these two OER pathways with that of MnOx electrodeposition elucidates the self-healing characteristics of these catalyst films. The intersection of the kinetic profile of deposition and that of water oxidation as a function of pH defines the region of kinetic stability for MnOx and importantly establishes that a non-noble metal oxide OER catalyst may be operated in acid by exploiting a self-healing process.

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Metadata

Authors
Huynh, M., Bediako, D. K., & Nocera, D. G.
Venue
Journal of the American Chemical Society
Published
2014-04-11
Volume
136
Issue
16
Pages
6002-6010
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2321284911
Cited by
585
References
54
FWCI
17.36
Type
journal article
Language
en
Open access
closed

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