High-efficiency hybrid supercapacitor based on three-dimensional interconnected nitrogen-rich caCTF-1 @pC-C3N4 network and NiCoTe2

The caCTF-1 derived from CTF-1 by carbonization is introduced into the multi-step heat treatment carbon repaired pC-C3N4 to form a 3D interconnected nitrogen-rich carbon structure (caC@pC). Through carbon repairing process, the obtained pC-C3N4 has an extended pi-conjugate plane and it is closely interconnected with the nitrogen-rich caCTF-1, thereby accelerating charge transfer, improving energy storage, and ex-hibiting high specific capacitance (535.8 Fmiddotg(-1) under 1 Amiddotg(-1)) and good rate performance. In addition, by employing MOF with diphenyl semicarbazide structural unit as a precursor, NiCoTe2 is prepared by a simple hydrothermal process, which exhibits high redox activity with a high specific capacitance of 2006.0 Fmiddotg(-1) at 1 Amiddotg-1 and good cycle stability. The hybrid supercapacitor NiCoTe2//caC@pC HSC is assembled with caC@pC as the negative electrode and NiCoTe2 as the positive electrode. When the power density is 790.05 Wmiddotkg(-1), it exhibits a high energy density of 50.84 Whmiddotkg(-1) and high cycle stability. After 25,000 cycles, the capacitance retention rate is 87.88%. (c) 2022 Published by Elsevier B.V.