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Green synthesis of N-doped porous carbon/carbon dot composites as metal-free catalytic electrode materials for iodide-mediated quasi-solid flexible supercapacitors by Rui Wang; Hongju Wang; Yi Zhou; Zhiyong Gao; Yue Han; Kai Jiang; Wenchao Zhang; Dapeng Wu is a Materials Science article available to read on EtoBox.

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P-Nitroaniline has been adopted as a versatile precursor for the selective preparation of N-doped porous carbon (PC) and carbon dots (CDs) with rich N functionalities. Furthermore, the CDs are anchored on PC to yield PC-CDs composites with the assistance of ultrasonication. Due to the catalytic effect of the pyridinic-and pyrrolic-N sites within the CDs as well as the high specific surface area and conductivity of PC, the optimized PC-CDs-1.5% composite (containing 1.5% CDs) could substantially promote the redox reaction of the acidic KI electrolyte. Therefore, the PC-CDs-1.5%-based supercapacitor demonstrated high specific capacitance (C s , 1783 F g -1 at 1 A g -1 ), good rate capability (800 F g -1 at 6 A g -1 ) and excellent cycling stability (84.7% C s retention upon 10 000 charge-discharge cycles). Moreover, when employed as the electrode in a flexible supercapacitor, the PC-CDs-1.5% composite also exhibits good capacitive performance in the PVA-H 2 SO 4 -KI gel electrolyte, and a high energy density (E cell ) of 13.85 W h kg -1 at a power density (P cell ) of 97.00 W kg -1 is also delivered. In addition, the flexible device shows good electrochemical cycling stability and th

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Author

Rui Wang; Hongju Wang; Yi Zhou; Zhiyong Gao; Yue Han; Kai Jiang; Wenchao Zhang; Dapeng Wu

Publisher

Royal Society of Chemistry (RSC)

Published

2022

Language

EN

Field

Materials Science (Physical Sciences)