CoMnO2-Decorated Polyimide-Based Carbon Fiber Electrodes for Wire-Type Asymmetric Supercapacitor Applications
| Autor: | Byoung-Suhk Kim, Jae-Hyun Noh, Jae-Gyoung Seong, Young-Hun Cho, Yong-Sik Chung, Da-Young Kim, Tae Hoon Ko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Pharmaceutical Science Electric Capacitance Imides Article Analytical Chemistry law.invention carbon fiber lcsh:QD241-441 chemistry.chemical_compound CoMnO2 lcsh:Organic chemistry law Nickel Drug Discovery supercapacitor electrodes Electrochemistry Physical and Theoretical Chemistry Electrodes Nanosheet Supercapacitor Nanotubes nanotechnology Organic Chemistry Electric Conductivity Oxides Cobalt Cathode Carbon Anode Nanostructures Chemical engineering chemistry Manganese Compounds Chemistry (miscellaneous) Metals Electrode wire-type Microscopy Electron Scanning Molecular Medicine Ammonium persulfate Layer (electronics) Oxidation-Reduction Porosity Polyimide |
| Zdroj: | Molecules, Vol 25, Iss 5863, p 5863 (2020) Molecules Volume 25 Issue 24 |
| ISSN: | 1420-3049 |
| Popis: | In this work, we report the carbon fiber-based wire-type asymmetric supercapacitors (ASCs). The highly conductive carbon fibers were prepared by the carbonized and graphitized process using the polyimide (PI) as a carbon fiber precursor. To assemble the ASC device, the CoMnO2-coated and Fe2O3-coated carbon fibers were used as the cathode and the anode materials, respectively. Herein, the nanostructured CoMnO2 were directly deposited onto carbon fibers by a chemical oxidation route without high temperature treatment in presence of ammonium persulfate (APS) as an oxidizing agent. FE-SEM analysis confirmed that the CoMnO2-coated carbon fiber electrode exhibited the porous hierarchical interconnected nanosheet structures, depending on the added amount of APS, and Fe2O3-coated carbon fiber electrode showed a uniform distribution of porous Fe2O3 nanorods over the surface of carbon fibers. The electrochemical properties of the CoMnO2-coated carbon fiber with the concentration of 6 mmol APS presented the enhanced electrochemical activity, probably due to its porous morphologies and good conductivity. Further, to reduce the interfacial contact resistance as well as improve the adhesion between transition metal nanostructures and carbon fibers, the carbon fibers were pre-coated with the Ni layer as a seed layer using an electrochemical deposition method. The fabricated ASC device delivered a specific capacitance of 221 F g&minus 1 at 0.7 A g&minus 1 and good rate capability of 34.8% at 4.9 A g&minus 1. Moreover, the wire-type device displayed the superior energy density of 60.2 Wh kg&minus 1 at a power density of 490 W kg&minus 1 and excellent capacitance retention of 95% up to 3000 charge/discharge cycles. |
| Databáze: | OpenAIRE |
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