Energy-Saving Synthesis of MOF-Derived Hierarchical and Hollow Co(VO3)2-Co(OH)2Composite Leaf Arrays for Supercapacitor Electrode Materials

A one-step and energy-saving method was proposed to synthesize hierarchical and hollow Co(VO3)2-Co(OH)2composite leaf arrays on carbon cloth, which expressed high capacitance (522 mF cm–2or 803 F g–1at the current density of 0.5 mA cm–2), good rate capability (79.5% capacitance retention after a 30-fold increase of the current density) and excellent cycling stability (90% capacitance retention after 15 000 charge–discharge cycles) when tested as a supercapacitor electrode.