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- W2111886868 abstract "In this study, the physical properties and electrical characteristics of carbon materials produced from organic waste were evaluated. First, used coffee grounds were carbonized and activated, and BrunauerEmmett-Teller (BET) surface area, pore volume, and pore size distributions were analyzed. In addition, activated carbon was applied to the polarized electrodes in electric double-layer capacitor (EDLC). The capacitances and internal resistances of the fabricated EDLC were evaluated by performing cyclic voltammetry (CV) measurement and alternating current impedance method. In this experiment, the electrolyte solution was 0.8 M (C2H5)4BF4 dissolved in propylene carbonate. The measurement sweep rate was changed from 1 to 100 mV/s and voltage range from -1.25 V to 1.25 V. First, waste coffee grounds were obtained from a Japanese beverage company. Waste coffee grounds were carbonized in N2 gas and activated in CO2 gas in a tube furnace, and thus, activated carbon was obtained. Figure 1 shows the N2 adsorption-desorption isotherms and activated carbon observed using scanning electron microscopy (SEM). The prepared activated carbon was found to be typical type I of the isotherm defined in the International Union of Pure and Applied Chemistry (IUPAC). This activated carbon had many micropores, as defined by the IUPAC. In addition, maximum BET surface area of activated carbon produced from coffee grounds was 1867 m/g. The process of preparing the polarized electrodes was as follows: activated carbon produced from coffee grounds and Ketjenblack (KB) were used as electrode materials. Activated carbon, polytetrafluoroethylene (PTFE) and KB were mixed in the mass ratio of 8.5:0.5:1.0. PTFE acts as a binder. Figure 2 shows cyclic voltammograms of the polarized electrode (sweep rate changed from 1 mV/s to 100 mV/s). At the sweep rate of 1 mV/s to 10 mV/s, the cyclic voltammograms exhibits a typical rectangular shape within the voltage range from -1.25 V to 1.25 V. Capacitances were increased by reducing the sweep rate. At the sweep rate of 1 mV/s, activated carbon achieves specific capacitances close to 101 F/g. In addition, High capacitance values of 90 F/g (sweep rate was 5 mV/s) and 81 F/g (sweep rate was 10 mV/s) were obtained. Gradual charge and discharge means that anion and cation in electrolyte could easily penetrate through the pores of activated carbon to a significant depth. It was understood that the accumulation charge of the EDLCs were influenced by the pore size distribution of the micropores and mesopores. The number of micropores in this sample is considerably larger than that of mesopores. Therefore, low sweep rate was effective for accumulating electrical charge. The solution resistances and charge transfer resistances were calculated from the Cole-Cole plot. The solution resistance and charge transfer resistance were low because the coffee grounds have a high bulk density. Acknowledgement This work was partly supported by a Scientific Research Grant from the Japan Society for the Promotion of Science and Program to Disseminate Tenure Tracking System from the Japanese Ministry of Education, Culture, Sports, Science and Technology. Further, it was also supported by a grant for Scientific Research on Priority Areas from the University of Miyazaki." @default.
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- W2111886868 date "2012-01-01" @default.
- W2111886868 modified "2023-09-25" @default.
- W2111886868 title "Electrochemical Properties of Nanocarbon Produced from Organic Waste and its Application in Electric Double-Layer Capacitor" @default.
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- W2111886868 doi "https://doi.org/10.1149/ma2012-02/2/84" @default.
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