Electrochemical capacitance study of cellulose-manganese dioxide nano-composite

Adelkhani, H.; Heidarpour, T.; Didehban, Kh.

doi:10.1134/s1023193517050020

Cited by 1 publication

(1 citation statement)

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“…[15][16][17][18][19] This study focused on the influence of the morphology and size of γ-MnO 2 obtained by two microwave-assisted hydrothermal techniques on the specific capacitance. The first hydrothermal method produces γ-MnO 2 through the reduction of permanganate solution, with Mn (II), according to the following reaction: 20 The second method produces γ-MnO 2 through the liquidphase oxidation, with Mn (II), according to the following reaction: 20,21 The morphology and microstructure of the γ-MnO 2 samples were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The specific surface area was estimated by N 2 adsorption-desorption tests and the electrochemical properties of the γ-MnO 2 , synthesized by the two microwave-assisted hydrothermal methods, were investigated by the cyclic voltammetry and electrochemical impedance spectroscopy techniques.…”

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confidence: 99%

Microwave-Assisted Synthesis and Characterization of γ-MnO2 for High-Performance Supercapacitors

Cuéllar-Herrera

Arce-Estrada

Romero‐Serrano

et al. 2021

J. Electron. Mater.

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Two hydrothermal techniques under microwave irradiation were used to synthesize γ-MnO2 from 90°C to 150°C in 10−30 min. The first technique is based on reducing KMnO4 with MnSO4, and the second one involves liquid-phase oxidation between MnSO4 and (NH4)2S2O8. The structures and morphologies of the samples were analyzed using X-ray diffraction, scanning electron microscopy, and N2 physisorption measurements. The electrochemical properties were evaluated through cyclic voltammetry and electrochemical impedance spectroscopy. The γ-MnO2 materials obtained by the first technique mainly exhibited nanorods with diameters of 40–60 nm, and the samples obtained by the second technique showed flower-like microspheres with diameters of 1−2 µm; each flower was composed of nanosheets with a thickness of 10−20 nm. The processing time directly depends on the size of the nanorods. The sample synthesized by the first technique at 150°C and 10 min has the highest specific surface area of up to 59.08 m2 g−1 and mean pore diameter of 34.11 nm. Furthermore, this sample exhibits a near-rectangular cyclic voltammetry curves and high specific capacitance of 331.3 F g−1 in 0.1 M Na2SO4 solution at 5 mV s−1 scan rate. Graphic abstract

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