Archivio Istituzionale della RicercaTransition 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 cobaltdoped 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.
The effect of Fe, Co, and Ni structural promotion of cryptomelane (KMn8O16) on the catalytic activity in oxygen evolution reaction / Stelmachowski, P.; Monteverde, A. H.; Jakubek, T.; Kotarba, A.; Specchia, S.. - In: ELECTROCATALYSIS. - ISSN 1868-2529. - STAMPA. - 9:(2018), pp. 762-769. [10.1007/s12678-018-0488-9]
The effect of Fe, Co, and Ni structural promotion of cryptomelane (KMn8O16) on the catalytic activity in oxygen evolution reaction
Stelmachowski,P.;Monteverde, A. H.;Kotarba, A.;Specchia, S.
2018
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 cobaltdoped 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.
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https://hdl.handle.net/11583/2713067
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