KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

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• 作者：Chaitra K^a ; ^d ; Vinny R T^a ; Sivaraman P^b ; Narendra Reddy^a ; Chunyan Hu^e ; ^f ; Krishna Venkatesh^a ; Vivek C S^a ; Nagaraju N^c ; Kathyayini N^a ; ^{nkathyayini45@gmail.com}
• 关键词：Asymmetric supercapacitor device ; Activated porous carbon ; High energy density ; Cyclability ; Power source
• 刊名：Journal of Energy Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：26
• 期：1
• 页码：56-62
• 全文大小：1824 K
• 卷排序：26

文摘

Here we demonstrate the fabrication, electrochemical performance and application of an asymmetric supercapacitor (AS) device constructed with β–Ni(OH)2/MWCNTs as positive electrode and KOH activated honeycomb-like porous carbon (K-PC) derived from banana fibers as negative electrode. Initially, the electrochemical performance of hydrothermally synthesized β–Ni(OH)2/MWCNTs nanocomposite and K-PC was studied in a three-electrode system using 1 M KOH. These materials exhibited a specific capacitance (Cs) of 1327 F/g and 324 F/g respectively at a scan rate of 10 mV/s. Further, the AS device i.e., β–Ni(OH)2/MWCNTs// K-PC in 1 M KOH solution, demonstrated a Cs of 156 F/g at scan rate of 10 mV/s in a broad cell voltage of 0–2.2 V. The device demonstrated a good rate capability by maintaining a Cs of 59 F/g even at high current density (25 A/g). The device also offered high energy density of 63 Wh/kg with maximum power density of 5.2 kW/kg. The AS device exhibited excellent cycle life with 100% capacitance retention at 5000th cycle at a high current density of 25 A/g. Two AS devices connected in series were employed for powering a pair of LEDs of different colors and also a mini fan.