Bacterial cellulose-based sheet-like carbon aerogels for the in situ growth of nickel sulfide as high performance electrode materials for asymmetric supercapacitors

• DOI: 10.1039/c7nr00130d
• Publication Date: 2017-03-06T09:25:23Z
• Authors: Lizeng Zuo; Wei Fan; Youfang Zhang; Yunpeng Huang; Wei Gao; Tianxi Liu
• Keywords: Bacterial Cellulose; Nickel sulfide; Carbon fibers

Electroactive materials, such as nickel sulfide (NiS), with high theoretical capacities have attracted broad interest to fabricate highly efficient supercapacitors. Preventing aggregation and increasing the conductivity of NiS particles are key challenging tasks fully achieve excellent electrochemical properties NiS. One effective approach solve these problems is combine porous conductive carbon materials aerogels. In this study, a green facile method for in situ growth on bacterial cellulose (BC)-derived sheet-like aerogels (CAs) has been reported. CA prepared by dissolution–gelation–carbonization process was used framework construct NiS/CA composite uniformly decorated pore walls CA. It found that aerogel electrodes exhibit capacitive performance specific capacitance (1606 F g−1), good rate retention (69% at 10 A enhanced cycling stability (91.2% after 000 continuous cyclic voltammetry cycles 100 mV s−1). Furthermore, asymmetric supercapacitors (ASCs) were constructed utilizing positive negative electrode respectively. Through synergistic effect three-dimensional structures networks derived from offered NiS, ASC device exhibited an energy density ∼21.5 Wh kg−1 power 700 W working voltage 1.4 V 2 M KOH aqueous solution. The also showed long-term cycle ∼87.1% scans. Therefore, shows great potential promising alternative high-performance