Co1-xS/N, S-codoped carbon loaded porous carbon cloth as flexible electrode for high performance supercapacitors
Shihui Yin, Lirong Kong, Yuebo Du, Wei Wei, Xiaoping Shen
Abstract
The capacitive performances of flexible electrodes highly depend on their architectures and redox activity. In this work, Co 1-x S/N, S-codoped carbon (NSC) loaded porous carbon cloth (p-CC) was prepared through an etching procedure and a followed repeated-sulfurization process. Since the porous CC could accommodate more Co 1-x S nanoparticles and the phase structure of Co 1-x S was well controlled by the repeated-sulfurization process, the obtained p-CC/Co 1-x S/NSC electrode with optimized composition and architecture exhibits high areal capacitances of 1263.8 mF cm −2 at 1 mA cm −2 and 858.6 mF cm −2 at 50 mA cm −2 . The deposited NSC on Co 1-x S could effectively prevent their slipping and agglomeration, and thus make the electrode exhibit high capacitance retention of 99.7 % after 20,000 charge–discharge tests. The all-solid-state symmetric supercapacitor assembled by the formed electrodes and ionic liquid/gel electrolyte shows a maximum energy density of 1.34 mWh cm −3 at the power density of 9.55 mW cm −3 . These results present a new strategy for the construction of cobalt-sulfide/carbon based flexible electrode with high capacitive performances.