On the Origin of the OER Activity of Ultrathin Manganese Oxide Films

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Paul Plate
  • Christian Höhn
  • Ulrike Bloeck
  • Peter Bogdanoff
  • Sebastian Fiechter
  • Roel van de Krol
  • Aafke C. Bronneberg

Detail(s)

Original languageEnglish
Pages (from-to)2428-2436
Journal / PublicationACS Applied Materials and Interfaces
Volume13
Issue number2
Online published11 Jan 2021
Publication statusPublished - 20 Jan 2021
Externally publishedYes

Abstract

There is an urgent need for cheap, stable, and abundant catalyst materials for photoelectrochemical water splitting. Manganese oxide is an interesting candidate as an oxygen evolution reaction (OER) catalyst, but the minimum thickness above which MnOx thin films become OER-active has not yet been established. In this work, ultrathin (<10 nm) manganese oxide films are grown on silicon by atomic layer deposition to study the origin of OER activity under alkaline conditions. We found that MnOx films thinner than 1.5 nm are not OER-active. X-ray photoelectron spectroscopy shows that this is due to electrostatic catalyst-support interactions that prevent the electrochemical oxidation of the manganese ions close to the interface with the support, while in thicker films, MnIII and MnIV oxide layers appear as OER-active catalysts after oxidation and electrochemical treatment. From our investigations, it can be concluded that one MnIII,IV-O monolayer is sufficient to establish oxygen evolution under alkaline conditions. The results of this study provide important new design criteria for ultrathin manganese oxide oxygen evolution catalysts. © 2021 American Chemical Society.

Research Area(s)

  • ALD, electrocatalysis, electrochemistry, MnO x, oxygen evolution, X-ray photoelectron spectroscopy

Citation Format(s)

On the Origin of the OER Activity of Ultrathin Manganese Oxide Films. / Plate, Paul; Höhn, Christian; Bloeck, Ulrike et al.
In: ACS Applied Materials and Interfaces, Vol. 13, No. 2, 20.01.2021, p. 2428-2436.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review