Solvothermal preparation of zinc cobaltite mesoporous microspheres for high-performance electrochemical supercapacitors

摘要: Abstract ZnCo2O4 mesoporous microspheres (ZMMs) assembled by a huge amount of nanoparticles (NPs) were solvothermally synthesized with subsequent annealing treatment in air. These ZMMs possess BET specific surface area 7.7 m2 g−1 and an average pore size 12.8 nm, respectively. The electrochemical performances the ZMMs-modified electrode evaluated using typical three-electrode system 2 M KOH aqueous electrolyte. ZMMs-based delivered high capacitance 588 F g−1 at 1 A g−1 good rate capability about 84% current densities increasing from 1 to 15 A g−1. Besides, exhibited outstanding long-term cycling stability during 5000-cycle charge-discharge process both 68.4% retention 99.7% Coulombic efficiency density 8 A g−1. Such probably attributed its unique porous structure providing many active reaction sites, fast ion electron transfer, strain accommodation as well. excellently properties make it one most promising materials for advanced supercapacitors.