High Energy Density One-Dimensional Supercapacitors Based on Metallic Cotton Threads
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We introduce a highly flexible asymmetric supercapacitor with outstanding energy and power densities from metallic cotton threads coated with transition metal oxide nanoparticles. In this study, highly porous cotton threads are coated with Au nanoparticles and small organic linker using layer-by-layer assembly method for the fabrication of metallic cotton threads with exceptional electrical conductivity (~ 2.1× 104 Scm−1). Using the same layer-by-layer assembly method, MnO and Fe3O4 nanoparticles are coated onto the formed metallic cotton threads for the anode and the cathode. Furthermore, Au nanoparticles are periodically inserted within the transition metal oxide multilayers for effective charge transport. The assembled one-dimensional solid-state asymmetric supercapacitors exhibit a remarkable areal energy density (80.7 μWhcm-2) and power density (3450.1 μWcm-2) with the high mechanical flexibility.