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Effect of Transition Metal Cations on Stability Enhancement for Molybdate-Based Hybrid Supercapacitor
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Murdoch Univ, Australia.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-6765-2084
Murdoch Univ, Australia.
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 21, 17977-17991 p.Article in journal (Refereed) Published
Abstract [en]

The race for better electrochemical energy storage systems has prompted examination of the stability in the molybdate framework (MMoO4; M = Mn, Co, or Ni), based on a range of transition metal cations from both computational and experimental approaches. Molybdate materials synthesized:with controlled nano scale morphologies (such as nanorods, agglomerated nanostructures, and nanoneedles for Mn, Co, and Ni elements, respectively) have been used as a cathode in hybrid energy storage systems. The computational and experimental data confirms that the MnMoO4 crystallized in beta-form with alpha-MnMoO4 type whereas Co and Ni cations crystallized in alpha-form with alpha-CoMoO4 type structure. Among the various transition metal Cations studied, hybrid device comprising NiMoO4 vs activated carbon exhibited excellent electrochemical performance having the specific capacitance 82 F g(-1) at a current density of 0.1 A g(-1) but the cycling Stability, needed to be significantly improved. The specific capacitance of the NiMoO4 electrode material is shown to be directly related to the surface area of the electrode/electrolyte interface, but the CoMoO4 and MnMoO4 favored a bulk formation that could be suitable for structural stability. The useful insights from the electronic structure analysis and effective mass have been provided to: demonstrate the role of cations in the molybdate structure and its influence in electrochemical energy storage. With improved cycling stability, NiMoO4 can be suitable for renewable energy storage. Overall, this study will enable the development of next generation molybdate materials with multiple cation substitution resulting,in better cycling stability and higher specific capacitance.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 9, no 21, 17977-17991 p.
Keyword [en]
capacitor, molybdate, stability, structural, computation, theoretical
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-327145DOI: 10.1021/acsami.7b03836ISI: 000402691600035PubMedID: 28481523OAI: oai:DiVA.org:uu-327145DiVA: diva2:1136550
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Swedish Research CouncilStandUp
Available from: 2017-08-28 Created: 2017-08-28 Last updated: 2017-08-28Bibliographically approved

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Watcharatharapong, TeeraphatChakraborty, SudipAhuja, Rajeev

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