Fabrication of manganese oxide electrodes by radio frequency sputtering for electrochemical capacitors

Lin, Chuen−Chang; Lee, Chih-Chung

doi:10.1007/s10800-009-9989-9

Cited by 6 publications

(2 citation statements)

References 40 publications

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“…1,2 Because of these advantages, supercapacitors can be widely used in applications such as hybrid vehicles, electronic devices, and digital products. [3][4][5][6] The 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.…”

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

Wang

Chen

2015

J. Electrochem. Soc.

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“…As a result, this causes an increase in grain size and crystallite size, which in turn results in increased surface roughness. 46,47 Based on the structural and morphological studies for thermally oxidized copper thin films, it can be deduced that there is a correlation between crystallite size, grain size, and surface roughness with increasing oxidation temperature. The highest chlorpyrifos sensing response has been observed at a thermal oxidation temperature of 400 °C for the manganese film, where the sensitivity is found to be around 30.…”

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confidence: 99%

Room Temperature Detection of Chlorpyrifos Using Thermally Oxidized Manganese and Copper Thin Films

Pattnaik

Ghosh²,

Sahoo³

et al. 2023

ECS J. Solid State Sci. Technol.

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Real-time monitoring of Chlorfyrifos is necessary for its safe application due to its toxicity, even at the residue level. In this work, an attempt has been carried out to detect chlorpyrifos at room temperature using thermally oxidized manganese and copper thin films. Thermal oxidation of thin films has been carried out under air ambient at different temperatures ranging from 400 to 550°C for manganese and 500 to 800°C for copper thin films. Morphological investigation depicts nano bar-like morphology and irregular-sized clusters for various oxidation temperatures of manganese oxide thin films, and granular-like morphology with an increase in grain size has been observed for increasing oxidation temperature. Structural investigation using the X-ray diffraction depicts the evolution of various phases of manganese oxide thin film and a single monoclinic phase for copper oxide thin film. The root-mean-square roughness of the manganese and copper film was found to vary differently with the rise in oxidation temperature. Copper oxide thin films have shown higher chlorpyrifos sensing response with sensitivity than thermally oxidized manganese thin films better sensing response towards chlorpyrifos. The sensitivity at room temperature is found to be 30 and 250 for manganese oxide and copper oxide thin films.

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Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors

Fan

Chen

et al. 2013

Asia-Pacific J Chem Eng

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MnO 2 as the electrode material for supercapacitors has attracted much interest in recent years. However, there are still some restrictions for its application. In this paper, to improve the capacitive properties of MnO 2 , material was synthesized by a facile and efficient low-temperature reduction reaction between KMnO 4 and Cu foil in sulfuric acid solutions. The results showed that the initial concentrations of KMnO 4 and the addition of concentrated sulfuric acid have distinct influence on the structure, morphology and electrochemical properties of the as-prepared MnO 2 . Particularly, morphological characterization displayed that the sample synthesized in 0.05 mol L À1 KMnO 4 and 16 mL concentrated sulfuric acid is composed of urchins with the average diameter of 0.7 mm. The product exhibits a discharge specific capacitance of 288.03 F g À1 at the constant current density of 65 mA g À1 . The capacitance remains about 50% of the initial capacitance at 250 mA g À1 , and is 100.06 F g À1 after the 100th cycle.

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Fabrication of manganese oxide electrodes by radio frequency sputtering for electrochemical capacitors

Cited by 6 publications

References 40 publications

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

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

Room Temperature Detection of Chlorpyrifos Using Thermally Oxidized Manganese and Copper Thin Films

Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors

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Fabrication of manganese oxide electrodes by radio frequency sputtering for electrochemical capacitors

Cited by 6 publications

References 40 publications

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

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

Room Temperature Detection of Chlorpyrifos Using Thermally Oxidized Manganese and Copper Thin Films

Facile synthesis and electrochemical properties of α‐MnO2 as electrode material for 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

Facile synthesis and electrochemical properties of α‐MnO₂ as electrode material for supercapacitors