Controlled Construction of Hierarchical Nanocomposites Consisting of MnO2 and PEDOT for High-Performance Supercapacitor Applications
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AbstractThe integration of hierarchical nanostructure design and encapsulation strategies using a combination of electrochemical deposition, hydrothermal, and insitu reaction methods has been recognized as one of the most effective strategies to realize practical applications of various supercapacitor materials. Herein, a facile and scalable method is developed to synthesize a core-shell-branch hierarchical MnO2@PEDOT@MnO2 composite by using a simple electrochemical deposition strategy. The proposed synthesis method facilitates the structural integration of three-dimensional nickel foam and the synergy of different electroactive materials, which offers several advantages including simplicity, efficiency, no binder, and low cost. The as-prepared, freestanding, hierarchical MnO2@PEDOT@MnO2 electrodes exhibit high specific capacitance and rate capability. An asymmetric supercapacitor is fabricated with the hierarchical MnO2@PEDOT@MnO2 nanocomposite as the positive electrode, activated carbon as the negative electrode, and Na2SO4 aqueous solution as the electrolyte. The asymmetric supercapacitor can be cycled reversibly in a high-voltage window of 0-1.8V and exhibits a high energy density of 47.8Whkg(-1) at a power density of 180 Wkg(-1), indicating remarkable rate capability as well as reasonable cycling performance with 91.3% retention after 5000 cycles.
All Author(s) ListTang PY, Han LJ, Zhang L, Wang SJ, Feng W, Xu GQ, Zhang L
Journal nameChemElectroChem
Detailed descriptionTo ORKTS: Shijie Wang is a bachelor student at CUHK.
His student ID is 1155029159.
Volume Number2
Issue Number7
Pages949 - 957
LanguagesEnglish-United Kingdom
Keywordscore-shell-branch; MnO2; nanostructures; PEDOT; supercapacitors
Web of Science Subject CategoriesElectrochemistry

Last updated on 2020-24-10 at 02:40