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http://hdl.handle.net/10087/6245
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Title: | EDLC from activated carbon derived from black liquor |
Other Titles: | 黒液から活性炭製造と電気二重層キャパシタの応用 |
Authors: | 趙, 小燕 チョウ, ショウエン Zhao, Xiao-Yan |
Keywords: | 黒液 活性炭 製造 電気二重層キャパシタ EDLC activated carbon black liquor |
Issue Date: | 23-Mar-2011 |
Publisher: | 群馬大学工学部 |
Abstract: | Using black liquor as a porous carbon precursor is considered as an effective approach
for value-added us e of black li quor. In additio n, black li quor contains high content of alkali
metals (Na, K, etc.), which are effectively used to improve the activation process.
Therefbre, preparation of activated carbons (ACs) directly from black liquor may reduce
the cost not only fbr lignin-recycling, but also fbr activating agents economizing. Electric
double-layer capacitors (EDLCs) are very attractive as a potential energy storage system
because of their high power density, quick charge-discharge rate, free maintenance,
long-life operation, and environmentally fiTiendly energy technology. EDLCs with activated
carbon electrodes are known to have higher capacity fbr energy storage compared with
conventional condensers. However, the application of ACs derived from black liquor fbr
the preparation of EDLCs has not been reported previously.
In chapter 2, high surTface area ACs were prepared by chemical activation of black
liquor with potassium hydroxide (KOH), sodium hydroxide (NaOH) and potassium
carbonate (K2C03). The influence of carbonization temperature, activation temperature,
holding time and impregnation ratio of activating agent to char on the porous
characteristics of the ACs was investigate d. The re sults show th at the surTface area and pore
volume of AC s, which were estimated by BET methods, were achieved as hi gh as 3 0 89 m2
g'i and 1.76 cm3 g'i fbur times 1arger than a commercial AC from charcoal (944 m2 g'i),
under the condition of an carbonization temperature of 600 OC, an activation temperature of
900 OC, a holding time of 2 h and an impregnation ratio (KOH/Char) of 2. In addition, the influence of alkali metals (K and Na) existing in black liquor on activation was also
examined. It was found that the alkali metals react as an activating agent in the process of
activation, thereby economizing the amount ofactivating agent used in this study to a high
degree.
In chapter 3, the perTfbrmance of ACs derived fiTom black liquor as EDLCs was
characterized. The gravimetric capacitance is fbund to be approximately proportional to the
BET surTface area, and the AC with the maximum gravimetric capacitance of41.4 F g'i and
the maximum volumetric capacitance of 16.6 F cm'3 was developed under the preparing
condition of an carbonization of 600 OC, an activation temperature of 600 OC, a holding
time of 2 h and an impregnation ratio (KOH/Char) of 2. In addition, the results obtained in
this study confirm that capacitance of ACs from black liquor not only depends on surface
area, but also on pore size. This study provides an effective approach to carry out the
value-added utiliz ation of black liquor. |
Description: | 学位記番号:工博甲420 |
URI: | http://hdl.handle.net/10087/6245 |
Academic Degrees and number: | 12301甲第420号 |
Degree-granting date: | 2011-03-23 |
Degree name: | 博士(工学) |
Degree-granting institutions: | 群馬大学 |
Appears in Collections: | 学位論文
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