화학공학소재연구정보센터
Electrochimica Acta, Vol.182, 474-481, 2015
Macroporous carbon from human hair: A journey towards the fabrication of high energy Li-ion capacitors
Human hair is a cheap and easily available source of carbon to be used as high performance electrode for electrochemical energy storage devices. In the present work, human hair is pre-treated and then activated using NaOH before being employed as electrode. The resulted activated carbon (ACHH) exhibits a high specific surface area of 1116 m(2) g(-1) which is one of the pre-requisite for it to be used as an electrode for supercapacitor applications. ACHH delivered a specific capacitance of similar to 115 F g(-1) at a current density of 100 mA g(-1) in single electrode configuration with Li in the presence of organic medium. This result was followed by the fabrication of symmetric supercapacitor and delivered an energy density of 19.2 Wh kg(-1). The energy density has been further improved by introducing an insertion type electrode, Li4Ti5O12 in Li-ion hybrid electrochemical capacitor (Li-HEC) assembly. The combined battery-supercapacitor type reactions in Li-HEC recorded the maximum energy density of 23 Wh kg(-1). An excellent cycleability is noted for both symmetric and Li-HEC in an organic medium. (C) 2015 Elsevier Ltd. All rights reserved.