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  • 1.
    Lavall, Rodrigo L.
    et al.
    Univ Fed Minas Gerais, Brazil.
    Candiotto de Oliveira, Pedro
    Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering. Univ Fed Minas Gerais, Brazil.
    Ortega, Paulo F. R.
    Ctr Fed Educ Tecnol Minas Gerais Campus I, Brazil.
    Trigueiro, Joao P. C.
    Ctr Fed Educ Tecnol Minas Gerais Campus I, Brazil.
    Gabriel, Jose B.
    Univ Fed Minas Gerais, Brazil.
    Heitmann, Ana P.
    Univ Fed Minas Gerais, Brazil.
    Chagas, Poliane
    Univ Fed Minas Gerais, Brazil.
    Oliveira, Cinthia C.
    Univ Fed Minas Gerais, Brazil.
    Oliveira, Luiz C. A.
    Univ Fed Minas Gerais, Brazil.
    An unprecedented hybrid polyoxometalate based on niobium oligomers: A notable application as redox supercapacitor electrode2023In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 455, article id 140511Article in journal (Refereed)
    Abstract [en]

    An unprecedented polyoxoniobate (PONb) oligomer was obtained by addition of a methylene blue (MB) dye solution over the PONb solution formed a blue nanogel that was converted into a stable blue solid through a lyophilization process. The new solid composite, so-called "blue polyoxoniobate" (blue-PONb), presents a two-dimensional (2D) morphology with electrochemical performance that stand out among the materials used in redox supercapacitor technology. This new material was evaluated as supercapacitor electrode showing a high areal specific capacitance and power density that reaches 110.50 mF cm(-2) and 8.49 mW cm(-2). In addition, in this composite the redox additive (MB) and the PONb presented a peculiar electrochemical behavior, the reduction of the niobium species and the transfer of electrons necessary for the accumulation of charge occurring simultaneously. As a result, blue-PONb electrode maintains the cycling performance with high coulombic effi-ciency (similar to 99 %) over the 50,000 cycles evaluated. Here, the origins of the electrochemical stability and the mechanism of operation of the blue-PONb electrode are analyzed and discussed. Finally, this work presents a PONb as a new and promising class of redox-capacitive materials with matrix/redox shuttle synergism.

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