Abstract
The growth of ultrathin ZnCo(2)O(4) nanosheets on reduced graphene oxide (denoted as rGO/ZnCo(2)O(4)) via a facile low-temperature solution method combined with a subsequent annealing treatment is reported. With the assistance of citrate, interconnected ZnCo(2)O(4) nanosheets can assemble into hierarchically porous overlays on both sides of rGO sheets. Such a hybrid nanostructure would effectively faciliate the charge transport and accommodate volume variation upon prolonged charge/discharge cycling for reversible lithium storage. As a result, the rGO/ZnCo(2)O(4) nanocomposite manifests a very stable high reversible capacity of around 960 mAh g(-1) over 100 cycles at a low current density of 90 mA g(-1) and excellent rate capability.