Investigation of cavity microelectrode technique for electrochemical study with manganese dioxides

Athouël, Laurence; Arcidiacono, Paul; Ramirez-Castro, Claudia; Crosnier, Olivier; Hamel, C.; Dandeville, Y.; Guillemet, Philippe; Scudeller, Y.; Guay, Daniel; Bélanger, Daniel; Brousse, Thierry

doi:10.1016/j.electacta.2012.06.004

Cited by 46 publications

(32 citation statements)

References 35 publications

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“…The higher scan rate results in smaller available capacitance, because of the reduced diffusion time and the low conductivity of MnO 2 . 29 As shown in Fig. 6, in contrast to the MnO 2 /L9AC electrode, the MnO 2 /G9AC electrode presents a better rate capability while the scan rate increases from 2 mV s −1 to 200 mV s −1 .The better electrochemi- cal performance of MnO 2 /G9AC composite can be rationalized by two reasons: (i) the enhanced electrical conductivity of MnO 2 /G9AC promotes charge transfer rate; (ii) given the same mass load, the smaller particles size of MnO 2 /G9AC with higher specific surface area is expected to lead to the overall thinner MnO 2 coatings and thus a better utilization of MnO 2 .…”

Section: Resultsmentioning

confidence: 99%

“…27,28 Brousse et al 29 found that the ionic and electronic conductivities were 0.01 and 0.009 S cm −1 for cryptomelane, respectively, compared to 0.015 and 5.8×10…”

mentioning

confidence: 99%

“…27,28 Brousse et al 29 found that the ionic and electronic conductivities were 0.01 and 0.009 S cm −1 for cryptomelane, respectively, compared to 0.015 and 5.8×10 −6 S cm −1 for birnessite, respectively. Because its poor conductivity was related to the microstructure, the conductivity values increased with the channel size and structure dimensionality from 1D to 3D.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…27,28 Brousse et al 29 found that the ionic and electronic conductivities were 0.01 and 0.009 S cm −1 for cryptomelane, respectively, compared to 0.015 and 5.8×10…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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

Wang

Chen

2015

J. Electrochem. Soc.

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“…PME has been successfully used in studies on hydrogen storage alloys [30], electrochemical capacitor materials [31], and so on because it does not require the use of additives and is easy to prepare. The PME structure is schematically shown in Fig.…”

Section: Powder Microelectrode (Pme) For Cyclic Voltammetry (Cv) Testmentioning

confidence: 99%

Improvement of the rate performance of hydrogen storage alloys by heat treatments in Ar and H2/Ar atmosphere for high-power nickel–metal hydride batteries

Gan

Yang

Shao

2015

Electrochimica Acta

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“…Mn(IV) reaction is no longer observed, but in this case, due to the undesired loss of active material. Although very recently specific capacitance values obtained by CME have been reported for MnO 2 [41], in general, CME technique does not allow performing precise quantitative measurements. In the present work, the active material loss was estimated from the discharge current fading.…”

Section: Cavity Microelectrode (Cme)mentioning

confidence: 99%

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

Goikolea

Daffos

Taberna

et al. 2013

Mater Renew Sustain Energy

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Over the last years, the different polymorphs of MnO 2 have been intensely studied as alternative compounds to amorphous hydrous RuO 2 as supercapacitor electrode materials. In the present work, nanosized birnessite-type MnO 2 platelets were synthesized via the polyol method followed by a subsequent ligand removal with NaOH. The resulting compound is easily dispersible in polar solvents, thus allowing the preparation of stable dispersions (2-3 days) that could be used in thin electrode preparation. The capacitance of the synthesized product was 130 F g -1 in a potential window of 0.8 V at a scan rate of 2 mV s -1 . The synthesized material was also studied using a cavity microelectrode to evaluate the electrochemical performance of the nanostructured oxide at high scan rates. Cyclic voltammetry measurements were successfully carried out both in the previous potential window between 0.1 and 0.9 V (vs. SHE) and in a larger potential window between -0.6 and 1.1 V (vs. SHE) from 0.1 and up to 1,000 mV s -1 . Therefore, herein prepared material could be potentially used for high power applications, although further work should be carried out to upscale such compound without compromising the performance.

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Investigation of cavity microelectrode technique for electrochemical study with manganese dioxides

Cited by 46 publications

References 35 publications

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

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

Improvement of the rate performance of hydrogen storage alloys by heat treatments in Ar and H2/Ar atmosphere for high-power nickel–metal hydride batteries

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

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Investigation of cavity microelectrode technique for electrochemical study with manganese dioxides

Cited by 46 publications

References 35 publications

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

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

Improvement of the rate performance of hydrogen storage alloys by heat treatments in Ar and H2/Ar atmosphere for high-power nickel–metal hydride batteries

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

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

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