Variation of the MnO2 Birnessite Structure upon Charge/Discharge in an Electrochemical Supercapacitor Electrode in Aqueous Na2SO4 Electrolyte

Athouël, Laurence; Moser, François; Dugas, Romain; Crosnier, Olivier; Bélanger, and Daniel; Brousse, Thierry

doi:10.1021/jp0773029

Cited by 353 publications

(249 citation statements)

References 113 publications

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“…The first one implies the intercalation of protons (H + ) or alkali metal cations (C + ) (such as Li + ) in the bulk of the material upon reduction followed by deintercalation upon oxidation. 24,25 MnO 2 + H + C + + e − ↔ MnOOH (MnOOC)…”

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confidence: 99%

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors

Wang

Chen

2015

J. Electrochem. Soc.

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In this paper, a MnO 2 /activated carbon (AC) composite with high electrochemical performance is synthesized through a novel synthesis method (Grafting Oxidation Method). The structure and morphology are analyzed using X-ray diffraction, Fourier transmission infrared spectra, scanning electron microscopy and transmission electron microscopy. Additionally, the electrochemical properties are evaluated through cyclic voltammetry, electrochemical impedance spectra and galvanostatic cycling measurements. The results demonstrate this MnO 2 /AC composite owes homogeneous particle size of nanometer dimension. The quasi-rectangular and symmetric cyclic voltammetry curves of the composite, which are measured under a three-electrode electrochemical system with a 0.5 mol L −1 Na 2 SO 4 solution at room temperature, indicate it has an ability of rapidly reversible Faraday reaction and good electrochemical behavior. Compared to the MnO 2 /AC prepared through liquid-phase method, the composite prepared by grafting oxidation method exhibits a much higher specific capacitance which is up to 332.6 F g −1 at scanning rate of 2 mV s −1 . A laboratory capacitor assembled with this MnO 2 /AC composite electrode shows an average capacitance attenuation rate of just 0.0068% after 2000 cycles. Besides, the impedance tests results show that the charge transfer resistance of this composite is 0.92 , which is much lower than the composite (2.52 ) synthesized through liquid-phase method. Supercapacitors, also known as electrochemical capacitors or ultracapacitors, have attracted considerable interest worldwide, primarily because of their ability to provide higher power densities than batteries and higher energy densities than conventional dielectric capacitors. 1,2Because of these advantages, supercapacitors can be widely used in applications such as hybrid vehicles, electronic devices, and digital products. 3-6The most crucial factors determining the electrochemical performance rely on the electrode materials. The electrode-active materials that are widely used for supercapacitors include carbon, conducting polymers and transition-metal oxides. Considering the investigated electrode materials, transition metal oxides are considered to be good alternatives due to their high capacity from pseudocapacitance. 26 have investigated the charge storage mechanism of manganese dioxide compounds with various structures. They discovered that the capacitance of all amorphous compounds was due to faradaic processes localized at the surface and subsurface regions of the electrode. The capacitance of the crystallized materials is clearly dependent upon the crystalline structure, especially with the size of the tunnels that could be able to provide limited cations intercalation. It's also found that the interlayer spacing of the MnO 2 birnessite structure increased upon electrochemical oxidation in the presence of Na + cations in the electrolyte due to the deintercalation of Na + and the intercalation of H 2 O between the layers. 25However, a major drawba...

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confidence: 99%

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors

Wang

Chen

2015

J. Electrochem. Soc.

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“…A similar result was also obtained for a layered MnO 2 . An increase of the interlayer spacing from 0.70 to 0.72 nm upon electrochemical oxidation indicated that alkaline metal cations, Na + ions, intercalated in the 2D tunnels of MnO 2 (Xu et al,2010;Athouel et al, 2008). The facts of lattice expansion and shrinkage during redox process indicated that the insertion of cations in the electrolytes predominates in the charge storage process of MnO 2 .…”

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confidence: 99%

Nanostructured MnO2 for Electrochemical Capacitor

Xu¹,

Bao²

2011

Energy Storage in the Emerging Era of Smart Grids

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“…This brings forth the search for a wide variety of materials. In general, transition metal oxides, including RuO 2 , MnO 2 , NiO, Co 3 O 4 , SnO 2 , ZnO, TiO 2 , V 2 O 5 , CuO, Fe 2 O 3 , and WO 3 (Lang et al 2011;Athoue et al 2008;Yan et al 2010;Chen et al 2012;Luo et al 2014;Liu et al 2014;Sathiya et al 2011;David et al 2014;Brezesinski et al 2009;Wang et al 2013;Liang et al 2010;Xia et al 2014;Kang et al 2013;Yu et al 2014), etc., have demonstrated high specific capacitance values with their redox reaction behaviors.…”

Section: Introductionmentioning

confidence: 99%

Mixed-phase bismuth ferrite nanoflake electrodes for supercapacitor application

et al. 2015

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Nanoflake bismuth ferrite thin film was synthesized by means of electrodeposition technique at room temperature. The morphology and phase evaluation of the synthesized electrode were analyzed using scanning electron microscopy, X-ray diffraction, Raman spectroscopy, and surface wettability techniques. Specifically, the bismuth ferrite nanoflake electrode exhibited high specific capacitance of 72.2 F g -1 at a current density of 1 A g -1 , and high rate capability with 37 % retention of capacitance even up to 20A g -1 , and excellent cycling stability with 82.8 % retention of the initial capacitance after 1500 charge/discharge cycles, supporting that the bismuth ferrite thin-film electrode could be a potential candidate for supercapacitor application.

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Variation of the MnO₂ Birnessite Structure upon Charge/Discharge in an Electrochemical Supercapacitor Electrode in Aqueous Na₂SO₄ Electrolyte

Cited by 353 publications

References 113 publications

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors

Nanostructured MnO2 for Electrochemical Capacitor

Mixed-phase bismuth ferrite nanoflake electrodes for supercapacitor application

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Variation of the MnO2 Birnessite Structure upon Charge/Discharge in an Electrochemical Supercapacitor Electrode in Aqueous Na2SO4 Electrolyte

Cited by 353 publications

References 113 publications

A Synthesis Method of MnO2/Activated Carbon Composite for Electrochemical Supercapacitors

A Synthesis Method of MnO2/Activated Carbon Composite for Electrochemical Supercapacitors

Nanostructured MnO2 for Electrochemical Capacitor

Mixed-phase bismuth ferrite nanoflake electrodes for supercapacitor application

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Product

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Variation of the MnO₂ Birnessite Structure upon Charge/Discharge in an Electrochemical Supercapacitor Electrode in Aqueous Na₂SO₄ Electrolyte

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors

A Synthesis Method of MnO₂/Activated Carbon Composite for Electrochemical Supercapacitors