Chitosan-assisted synthesis of wearable textile electrodes for high-performance electrochemical energy storage
Through a facile “dipping and drying” process, reduced graphene oxide, here simply referred to as “graphene”, was successfully coated onto a commercial textile substrate, resulting in a high-performance supercapacitor electrode with excellent flexibility and stretchability. With the assistance of difunctional chitosan (for dispersing and gluing), a high graphene loading amount of 5.5 mg cm−2 was achieved on cotton textile within 10 soaking times. The graphene@cotton-10 had a low sheet resistance of 1.75 Ohm sq−1, which merely increased 0.51 and 0.78 Ohm sq−1 when being bent at 180° and stretched with 100% strain, respectively. In a three-electrode configuration, the areal specific capacitance of the graphene@cotton-10 reached up to 232 mF cm−2 at the current density of 1 mA cm−2, which was superior to most of the carbon@textile flexible electrodes reported so far. The resulting graphene@cotton-10 symmetrical supercapacitor had a decent energy density of 4.38 μWh cm−2 at 5 mW cm−2. Cycling test revealed the supercapacitor had more than 80% retention of its initial capacitance after 5000 cycles at 5 mA cm−2, demonstrating an outstanding long-term durability. Furthermore, the synthesis methodology established in this study is simple, efficient and environment-friendly, which possesses a great potential for large-scale practical applications.
KeywordsSupercapacitor Graphene Textile Flexibility Stretchability
We are grateful for financial support from National Natural Science Foundation of China (Nos. 21875091 and 51672114), Natural Science Foundation of Jiangsu province (Nos. BK20171295 and BK20161357), and Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX18_2235).
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