Hierarchical CuCo2O4 nanourchin supported by Ni foam with superior electrochemical performance

摘要: Abstract Three-dimensional (3D) hierarchical CuCo2O4 nanourchin architecture assembled from one-dimensional (1D) porous nanowire is successfully fabricated on Ni foam using a facile hydrothermal method followed by thermal treatment. The electrochemical properties of the synthesized nanomaterial have further investigated as binder-free electrode for supercapacitor. Impressively, exhibits remarkable pseudocapacitive performance with high specific capacitance 1569.9 F g-1 at current density 0.6 A g−1 (corresponding to 5.2 F cm-2 at 2 mA cm−2), good rate capability and excellent cycling stability (nearly 98.0% retention after 4000 cycles at 3.0 A g−1). Moreover, even 20 A g−1, still maintains around 71.1% initial over 10000 cycles. outstanding behaviors are mainly due its structure which provides large electroactive surface sites, big electrolyte infiltrate area, high-electron/ion-transfer stability. an asymmetric supercapacitor based positive activated carbon (AC) negative evaluate practical applications. Remarkably, CuCo2O4//AC device has demonstrated energy 23.9 Wh kg−1 power 593.2 W kg−1 (91.5% 2000 cycles).