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The Effect of Fe, Co, and Ni Structural Promotion of Cryptomelane (KMn8O16) on the Catalytic Activity in Oxygen Evolution Reaction

Authors
  • Stelmachowski, Paweł1, 2
  • Monteverde Videla, Alessandro H. A.1
  • Jakubek, Tomasz2
  • Kotarba, Andrzej2
  • Specchia, Stefania1
  • 1 Politecnico di Torino, Department of Applied Science and Technology, Torino, Italy , Torino (Italy)
  • 2 Jagiellonian University in Kraków, Faculty of Chemistry, Krakow, Poland , Krakow (Poland)
Type
Published Article
Journal
Electrocatalysis
Publisher
Springer US
Publication Date
Sep 11, 2018
Volume
9
Issue
6
Pages
762–769
Identifiers
DOI: 10.1007/s12678-018-0488-9
Source
Springer Nature
Keywords
License
Green

Abstract

Transition metal (Fe, Co, Ni)-doped cryptomelane materials (K-OMS-2) were synthesized and characterized with the use of XRD, Raman spectroscopy, XPS, N2-BET, H2-TPR, and SEM. The electrocatalytic reactivity in oxygen evolution was evaluated with the use of the rotating disk electrode. It was found that the electrocatalytic activity is substantially enhanced for the cobalt-doped material, while iron and nickel doping have no, or even, negative effect on K-OMS-2. The structure of the material bulk is preserved in all cases, but the formation of additional birnessite phases can be evidenced for the iron and cobalt dopants. It is discussed that the reactivity enhancement of Co/K-OMS-2 can be related not only to the formation of cobalt-doped heterophases (cobaltane, birnessite) but also to the changes of the properties of pristine cryptomelane. Graphical AbstractTransition metal (Fe, Co, Ni) doped cryptomelane materials (K-OMS-2) were investigated, and the oxygen evolution reactivity enhancement was observed for the Co/K-OMS-2 material. The increased reactivity can be related to the formation of cobalt doped heterophases (cobaltane, birnessite), but also to the changes of the properties of pristine cryptomelane

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