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Tuning the Electrocatalytic Activity of Co3O4 through Discrete Elemental Doping
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 43, p. 39706-39714Article in journal (Refereed) Published
Abstract [en]

To gain constructive insight into the possible effect of doping on the electrocatalytic activity of materials, a catalytic framework with a discrete distribution of dopants is an appropriate model system. Such a system assures well-defined active centers, maximum atom utilization efficiency, and hence enhanced selectivity, catalytic activity, and stability. Herein, a comprehensive investigation of the electrocatalytic activity of iron-doped cobalt oxide (Fe-Co3O4) nanosheets is presented. In order to understand the contribution of dopants, a series of materials with controlled doping levels are investigated. By controlled iron inclusion into the structure of Co3O4, an apparent improvement in the oxygen evolution reaction activity which is reflected in the decrease of 160 mV in the overpotential to reach the current density of 10 mA/cm(2) is manifested. Additionally, it is shown that there exists an optimum doping content above which the catalytic activity fades. Further investigation of the system with density functional calculations reveals that, along with the optimization of adsorption energy toward the reaction intermediates, substantial downshift of the Fermi level and delocalization of electron density occurs on introducing iron ions into the structure.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 11, no 43, p. 39706-39714
Keywords [en]
oxygen evolution reaction, doping, cobalt oxide, iron-doped cobalt oxide
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-165337DOI: 10.1021/acsami.9b06815ISI: 000493869700027PubMedID: 31595745OAI: oai:DiVA.org:umu-165337DiVA, id: diva2:1373098
Funder
Swedish Research Council, 2015-06462Available from: 2019-11-26 Created: 2019-11-26 Last updated: 2019-11-26Bibliographically approved

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Sharifi, Tiva

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