RGO/Co3O4 Composites Prepared Using GO-MOFs as Precursor for Advanced Lithium-ion Batteries and Supercapacitors Electrodes

In this study, GO-MOFs derived rGO coating/sandwiching Co3O4 composites ( denoted as rGO/Co3O4) are fabricated by employing a temperate coprecipitation method with ZIF-67 rhombic dodecahedron as a template and GO as a substrate. In these composites, nanoporous and rGO coating ( denoted as rGO@Co3O4)/sandwiching ( denoted as Co3O4-rGO-Co3O4) structures are designed, which endow the composites with strong potential application as electrode materials for lithium-ion batteries ( LIBs) and supercapacitors ( SCs). Here, the as-prepared rGO@Co3O4 and Co3O4-rGO-Co3O4 composites not only exhibit outstanding lithium storage performances with high initial discharge specific capacities ( 1451 and 1344 mA h g (1) at a current density of 100 mA g (1)), excellent cycling stabilities ( above 96% and 95% retention after 100 cycles) and admirable rate capabilities ( 328 and 450 mA h g (1) at a current density of 2000 mA g (1)), but also display superior pseudocapacitive properties with high specific capacitance ( 546 F g (1)), remarkable rate capability and brilliant cycling stability ( 90% of initial capacitance retention at 5 A g (1) after 10000 cycles). The remarkable porous architecture and electrical conductivity enables GO-MOFs derived transition metal oxide composites to be promising electrode materials for next generation LIBs and SCs. (C) 2016 Elsevier Ltd. All rights reserved.