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Comprehensive Study of an Earth-Abundant Bifunctional 3D Electrode for Efficient Water Electrolysis in Alkaline Medium
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 51, 28148-28155 p.Article in journal (Refereed) PublishedText
Abstract [en]

We report efficient electrolysis of both water splitting half reactions in the same medium by a bifunctional 3D electrode comprising Co3O4 nanospheres nucleated on the surface of nitrogen-doped carbon nanotubes (NCNTs) that in turn are grown on conductive carbon paper (CP). The resulting electrode exhibits high stability and large electrochemical activity for both oxygen and hydrogen evolution reactions (OER and HER). We obtain a current density of 10 mA/cm(2) in 0.1 M KOH solution at overpotentials of only 0.47 and 0.38 V for OER and HER, respectively. Additionally, the experimental observations are understood and supported by analyzing the Co3O4:NCNT and NCNT:CP interfaces by ab initio calculations. Both the experimental and the theoretical studies indicate that firm and well-established interfaces along the electrode play a crucial role on the stability and electrochemical activity for both OER and HER.

Place, publisher, year, edition, pages
2015. Vol. 7, no 51, 28148-28155 p.
Keyword [en]
water splitting, bifunctional catalyst, oxygen evolution reaction, hydrogen evolution reaction, transition metal oxides, nitrogen-doped carbon nanotubes
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-117855DOI: 10.1021/acsami.5b10118ISI: 000369448200021PubMedID: 26629887OAI: oai:DiVA.org:umu-117855DiVA: diva2:912446
Available from: 2016-03-16 Created: 2016-03-04 Last updated: 2016-03-16Bibliographically approved

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Sharifi, TivaGracia-Espino, EduardoJia, XueenSandström, RobinWågberg, Thomas
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