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Author: search.filters.author.Wongwiriyapan, WinaddaSubject: search.filters.subject.Activated carbon

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    Preparation of activated carbon via acidic dehydration of durian husk for supercapacitor applications
    (2020-08-01)
    Ukkakimapan, Pundita
    ;
    Sattayarut, Vichuda
    ;
    Wanchaem, Thanthamrong
    ;
    Yordsri, Visittapong
    ;
    Phonyiem, Mayuree
    In this study, the preparation of activated carbons (ACs) via acidic dehydration of durian husk (DH) for supercapacitor application was investigated. The DH was dehydrated using sulfuric acid and subsequently activated by using sodium hydroxide as chemical reagent at 720 °C to obtain activated carbon (hereinafter referred to as DA). Surpassing the commercial ACs and the ACs derived from the conventional carbonization and activation (hereinafter referred to as CA), the DA exhibited superior properties in high surface area (2578 m<sup>2</sup>/g) and total pore volume (1.27 cm<sup>3</sup>/g). Moreover, besides carbon and oxygen, the DA contained sulfur and nitrogen in the carbon network. The DA can act as a suitable material for supercapacitor electrode with the specific gravimetric and volumetric capacitances of 145 F/g and 70 F/cm<sup>3</sup> in an organic electrolyte. The device also showed a promising performance with an energy density of 32 Wh/kg and a power density of 316 W/kg. These results demonstrate that the preparation of ACs via acidic dehydration of DH offers the advantages in terms of simplicity, low cost, and short-time processing to achieve heteroatom self-doped ACs with a high surface area for high-performance supercapacitors.
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    Investigation on electrochemical properties of sugarcane leaves-derived activated carbon by steam activation
    (2020-01-01)
    Ukkakimapan, Pundita
    ;
    Ukakimaparn, Prapart
    ;
    Wanchaem, Thanthamrong
    ;
    Yordsri, Visittapong
    ;
    Sattayarut, Vichuda
    Sugarcane leaves (SLs) are a bio-waste from sugar production industry. To explore the value-added SLs, the SLs were used raw materials of activated carbons (ACs) by steam activation and their electrochemial properties were investigated for supercapacitor applications. The synthesis of ACs from the SLs consisted of two steps; carbonization at 500ºC and steam activation. The synthesis condition was optimized by varying activation temperature (800 and 850ºC) The porous structures were thoroughly formed on the surface after steam activation and the surface areas were reached to 630 and 639 m<sup>2</sup> g<sup>-1</sup> at the activation temperature of 800 and 850ºC, respectively. The SLs-derived ACs activated at 800ºC assembled in coin cell using organic electrolyte showed the highest specific capacitance of approximately 16 F g<sup>-1</sup> with a capacitance retention of 62% when the current density increased to 1.5 A g<sup>-1</sup>. Even though there is a room to improve the electrochemical properties such as optimization of porosity and removal of inorganic component, the SLs show a potential use as raw materials of ACs for supercapacitor applications.
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    Preparation of activated carbon from bamboo-cellulose fiber and its use for EDLC electrode material
    (2017-04-01)
    Fujishige, Masatsugu
    ;
    Yoshida, Ichiro
    ;
    Toya, Yumiko
    ;
    Banba, Yasuo
    ;
    Oshida, Kyo ichi
    Carbonization and post activation of bamboo-cellulose fiber was carried out. The carbonization was performed at 600°C, 800°C and 1000°C in argon atmosphere. Then, they were activated by heating solid mixture of carbonized bamboo and sodium hydroxide (NaOH) at 720°C in argon atmosphere. The largest specific surface area of the resulting activated carbon (carbonized at 600°C) was 2366m2/g with the micropore volume of 0.71cm3/g and mesopore volume of 0.06cm3/g. It was found that the carbonization temperature is very important to obtain nanoporous carbon with large specific surface area. The distributions of interlayer spacing were estimated from the power spectra of the TEM images of the carbonized samples. It showed the interlayer spacing of basic structural unit (BSU) decreased from 0.49nm (BC-0600) through 0.47nm (BC-0800) to 0.45nm (BC-1000). The activated carbon was used as the host material of the electrodes of coin type electric double-layer capacitor (EDLC) with organic electrolyte. The observed specific capacitance was 43F/g (23F/cm3) for the activated carbon (carbonized at 600°C), comparable to 44F/g (22F/cm3) of commercial activated carbon (MSP). The corresponding values for the activated carbons (carbonized at 800°C and 1000°C) were 40F/g (23F/cm3) and 17F/g (12F/cm3), respectively.