Sandwich-like GO@Co(OH)2/PANI derived from MOFs as high-performance electrode for supercapacitors

Sandwich-like layered composite materials possess a high contact area and can expose many reactive active sites, which exhibit great potential in the application of supercapacitors. In this paper, a sandwich-like composite material was synthesized based on polyaniline (PANI), graphene oxide (GO) and ZIF-67 (denoted as GO@ZIF-67/PANI). Among them, GO is designed as a deposition substrate of ZIF-67 and transfer scaffold of electrons and PANI works as a wire to connect graphene layers and nanoparticles, which increases the conductivity of the material and makes the electron transfer easier. At the current density of 1 A g(-1), the specific capacitance of the ZIF-67 composite is up to 5 times that of the ZIF-67. After alkali treatment, ZIF-67 is converted into Co(OH)(2) nanosheet (denoted as GO@Co(OH)(2)/PANI), which remarkably promotes the transfer of electrolyte ions and electrons. At the current density of 1 A g(-1), the resulting specific capacitance is 15 times more than ZIF-67. The excellent energy storage performance indicates that the prepared novel composite material has important development prospects in energy storage. (C) 2020 Published by Elsevier B.V.