Low-cost supercapacitors have the ability to rapidly store a large amount of charge, which makes them the best alternative to batteries in portable electronics. Here, we demonstrate the fabrication of all-carbon supercapacitors using an organic electrolyte. By using ZIF-derived nanoporous carbon electrodes, we have realized a high-performance supercapacitor cell using 2 M NEt4BF4/PC as the electrolyte. Our device shows good energy storage capacity that is comparable to the other previously reported supercapacitors.
Metal−organic frameworks (MOFs) can serve as high-surface-area templates to generate hierarchically ordered nanoporous carbon electrodes for high-performance supercapacitor devices. Here we describe a simple chemical approach to synthesize dense three-dimensional (3D) arrays of core−shell ZnO@ZIF-8 and Co(CO 3 ) 0.5 (OH)•0.11H 2 O@ZIF-67 nanowires on a conductive carbon cloth. Annealing the core−shell structures at high temperatures converted the MOF shell into a composite of nanoporous carbon (NC) mixed with conductive metal oxides. The conformal nature of the MOF-coating process generates a NC film with continuous conductive paths from the outer surfaces of the nanowires down to the flexible carbon electrode. Carbonization of ZIF-67 transforms the material into conductive sp 2 type carbon mixed with Co 3 O 4 nanostructures. Because Co 3 O 4 is a faradic metal oxide with a high theoretical capacitance, these Co 3 O 4 /NC hybrid heterostructure arrays are a promising candidate material for use in an electrochemical supercapacitor device. The Co 3 O 4 /NC hybrid electrodes had good performance and exhibited a high areal capacitance of 1.22 F• cm −2 at 0.5 mA•cm −2 . Conformal deposition of MOFs via the chemical vapor method offers a promising new platform to design conductive, ultrahigh surface area electrodes that preserve the 3D morphology for applications in supercapacitors and electrocatalysis.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.