Graphene aerogel-coated MoO 3 nanoparticle/polypyrrole ternary composites for high-performance supercapacitor
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Graphene aerogel-coated MoO3 nanoparticle/ polypyrrole ternary composites for high-performance supercapacitor Qing Xin1,2,* 1 2
, Zhicheng Guo1, Yue Zang1,2, and Jun Lin1,2
College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, People’s Republic of China Zhejiang Provincial Key Lab of Equipment Electronics, Hangzhou Dianzi University, Hangzhou 310018, People’s Republic of China
Received: 21 May 2020
ABSTRACT
Accepted: 17 August 2020
A graphene aerogel-coated molybdenum trioxide/polypyrrole (MoO3/ GA@PPy) composite was synthesized via hydrothermal and in site polymerization reactions. The character of PPy, MoO3/GA, and MoO3/GA@PPy were investigated by X-ray diffraction, Fourier transform spectroscopy, Raman spectroscopy, photoluminescence spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results of the morphological and structural analysis clearly revealed the formation of ternary nanocomposites. The electrochemical properties, such as capacitance, specific capacitance retention at different current loads, cycling stability, and impedance, were discussed as well. Improvement of electrochemical performances of the ternary nanocomposites was observed. The MoO3/GA@PPy showed a maximum specific capacitance of 1788 F/g at current density of 1 A/g.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction As next-generation energy storage systems, supercapacitors attract great interest due to their fast chargedischarge rates, superior cycle efficiency, and high power density [1]. High-quality energy storage materials have attracted great interest for application in supercapacitors. Supercapacitor can be divided into electrical double-layer capacitors (EDLCs) and pseudocapacitors according to storage mechanism. The energy storage in the EDLCs is conducted by the adsorption and desorption of ions, while the energy
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https://doi.org/10.1007/s10854-020-04271-0
storage in pseudocapacitors is related to the fast redox reaction. Porous carbons are commonly used for EDLCs owing to their excellent conductivity, high surface area, and the outstanding stability, especially. However, relatively low specific capacitance limits their application. Zhuo et al. prepared cellulose carbon aerogel/PPy composites, and the cellulose carbon aerogel showed specific capacitance of 218.8 F/g [2]. Yang et al. reported a bio-carbon and graphene-based material with specific capacitance of 189 F/g [3]. The transition metal oxides and conducting polymers are two main materials for pseudocapacitors. Although
J Mater Sci: Mater Electron
transition metal oxide electrodes have high specific capacitance (e.g., theoretical specific capacitance for MnO2 is 1370 F/g [4]), their poor electrical conductivity and structural instability still remain to be improved. Moreover, conducting polymers show high specific capacitance (e.g., theoretical specific capacitance for PPy is 620 F/g [5]), but the main proble
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