Controllable Intercalated Polyaniline Nanofibers Highly Enhancing the Utilization of Delaminated RuO <sub>2</sub> Nanosheets for High‐Performance Hybrid Supercapacitors
Gaini Zhang, Lingjuan Deng, Jinqian Liu, Jianhua Zhang, Jingjing Wang, Wenbin Li, Xifei Li
Abstract
Abstract Ruthenium oxide (RuO 2 ) and polyaniline (PANI) are attracting extensive attention as electrode materials due to their remarkable pseudocapacitance. However, RuO 2 suffers from low utilization and PANI sustains poor stability. Herein, both defects were optimized by designing intercalated‐structure PANI/RuO 2 composites, which were fabricated for the first time by controllable chemical polymerization of aniline on the delaminated RuO 2 nanosheets. Intercalated PANI nanofibers not only highly prevent the RuO 2 nanosheets from their reassembling as well as increase the interlayer spacing among RuO 2 nanosheets but also alleviate the swelling/shrinking of PANI during charge‐discharge progress. In comparison to the pristine RuO 2 nanosheets, the obtained intercalated structure is beneficial for creating channels for better ion transfer and electron transport, which leads to a high‐efficiency utilization of RuO 2 nanosheets. The optimized PANI/RuO 2 ‐38 electrode with a RuO 2 content of 61.7 wt% shows the highest utilization of 72.1 % of RuO 2 , resulting in the highest specific capacity of 816 F g −1 . The asymmetric supercapacitor PANI/RuO 2 //AC offers a high energy density of 25.7 Wh kg −1 at 375 kW kg −1 , further indicating a good potential as energy‐storage device.