Facile synthesis of mesoporous Ni0.3Co2.7O4 hierarchical structures for high-performance supercapaci
Hao Bin Wu,b Huan Pang*ab and Xiong Wen (David) Lou*b
Energy &Environmental Science, 2013, DOI: 10.1039/c3ee42101e
In this work, we report the facile synthesis of mesoporous nickel cobalt oxide (Ni0.3Co2.7O4) hierarchicalstructures with excellent supercapacitive performance. Nickel cobalt oxalate hydrate (Ni0.1Co0.9C2O4$nH2O)is first synthesized as the precursor via a facile precipitation method, followed by controlled annealing toobtain mesoporous Ni0.3Co2.7O4 hierarchical structures. The sample prepared at a relatively low annealingtemperature (400 C) possesses more abundant mesopores and higher specific surface area, and exhibitsexcellent supercapacitive performance in aqueous alkaline electrolytes. An exceptionally high specificcapacitance of 960 and 805 F g1 is obtained under current densities of 0.625 and 6.25 A g-1,respectively, with excellent cyclic stability. The remarkable electrochemical performance is attributed to thedesirable composition and the unique hierarchical mesoporous architectures.
