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An unprecedented hy...
An unprecedented hybrid polyoxometalate based on niobium oligomers: A notable application as redox supercapacitor electrode
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- Lavall, Rodrigo L. (författare)
- Univ Fed Minas Gerais, Brazil
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- Candiotto de Oliveira, Pedro (författare)
- Linköpings universitet,Laboratoriet för organisk elektronik,Tekniska fakulteten,Univ Fed Minas Gerais, Brazil
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- Ortega, Paulo F. R. (författare)
- Ctr Fed Educ Tecnol Minas Gerais Campus I, Brazil
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- Trigueiro, Joao P. C. (författare)
- Ctr Fed Educ Tecnol Minas Gerais Campus I, Brazil
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- Gabriel, Jose B. (författare)
- Univ Fed Minas Gerais, Brazil
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- Heitmann, Ana P. (författare)
- Univ Fed Minas Gerais, Brazil
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- Chagas, Poliane (författare)
- Univ Fed Minas Gerais, Brazil
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- Oliveira, Cinthia C. (författare)
- Univ Fed Minas Gerais, Brazil
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- Oliveira, Luiz C. A. (författare)
- Univ Fed Minas Gerais, Brazil
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(creator_code:org_t)
- ELSEVIER SCIENCE SA, 2023
- 2023
- Engelska.
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Ingår i: Chemical Engineering Journal. - : ELSEVIER SCIENCE SA. - 1385-8947 .- 1873-3212. ; 455
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- Blue polyoxoniobate; Methylene blue; Nanosheet niobium; Hybrid electrodes; Supercapacitor; Redox-shuttle
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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