Nitrogen doped siloxene and composite with graphene for high performance fiber-based supercapacitors
Bing Bai, Linlin Qiu, Yongfeng Yuan, Lixin Song, Jie Xiong, Pingfan Du
Abstract
Graphene fiber-based supercapacitors (FSCs), with excellent power and energy density , are promising candidates for powering smart flexible electronic devices. However, the low mass loading of active materials and slow diffusion of ions limit their electrochemical performance. Herein, we report a robust and facile strategy, aimed at constructing nitrogen-doped siloxene/graphene 2D/2D composites (N-SiNs@G) by the pyrolyzation of siloxene/polypyrrole to further enhance the electrochemical performance of fiber electrodes. The carbonization of polypyrrole nanoparticles offers an in-situ nitrogen source for doping siloxene to prepare nitrogen-doped siloxene (N-SiNs), which enhances the electronic conductivity and energy storage capacity of siloxenes. The N-SiNs@G composites exhibit a multi-component synergistic effect for enhancing ion diffusion. Furthermore, the graphene nanosheets maintain the integrity and stability of the hybrid fiber and offer flexibility. The nitrogen-doped siloxene/graphene hybrid fibers (N-SiGFs) electrodes designed in this study showed remarkable electrochemical performance and exceptional mechanical flexibility for fiber-based supercapacitor applications.