Coconut-Shell-Based Porous Carbons with a Tunable Micro/Mesopore Ratio for High-Performance Supercapacitors

Autor:	Wen-Cui Li, Juan Mi, Wen-Hui Qu, Xiao-Rong Wang, Rui-Jun Fan
Rok vydání:	2012
Předmět:	Supercapacitor Fuel Technology Materials science Adsorption Volume (thermodynamics) Chemical engineering Water flow General Chemical Engineering Yield (chemistry) Energy Engineering and Power Technology Thermal treatment Mesoporous material Pyrolysis
Zdroj:	Energy & Fuels. 26:5321-5329
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef3009234
Popis:	Granular micro/mesoporous carbon with a ratio of mesopore to total pore volume (Vmeso/Vtotal) greater than 75% was prepared using coconut shells as a precursor by a one-step thermal treatment, i.e., combined pyrolysis and steam activation process. The process variables, such as final activation temperature, time, and water flow rate were studied. The N2 adsorption isotherms of the samples were of type IV, indicating mesoporous characteristics. The mesoporosity of the resultant porous carbons prepared by this method is greater than the one of those prepared by the conventional two separate pyrolysis and activation processes. Experimental results showed that the yield of porous carbon was proportional to the final pyrolysis temperature and activation time. Additionally, with the increase of activation time and water flow rate, the mesoporosity increased considerably. When the activation time and water flow rate were kept constant, the mesoporosity also increased with a rise in the final pyrolysis temperatur...
Databáze:	OpenAIRE
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