Hierarchical MnCo2O4@CuCo2O4 core-shell nanoarrays on carbon cloth as binder-free electrode for flexible all-solid-state asymmetry supercapacitors

Hierarchical core-shell nanowire arrays with a shell of CuCo 2 O 4 nanosheets and a core of MnCo 2 O 4 nanowires directly coated on the conductive carbon cloth (CC) are rationally designed and synthesized via a facile hydrothermal route with a post low-temperature thermal treatment in air. The binder-free MnCo 2 O 4 @CuCo 2 O 4 /CC composite material exhibits an enhanced performance (1241.0 C g −1 at 1 A g −1 ) compared with the MnCo 2 O 4 /CC (832.7 C g −1 at 1 A g −1 ) and CuCo 2 O 4 /CC (734.1 C g −1 at 1 A g −1 ). In addition, the MnCo 2 O 4 @CuCo 2 O 4 /CC electrode is assembled into a flexible all-solid-state asymmetric supercapacitor (ASC), which delivers a maximum specific energy of 62.0 Wh kg −1 at a specific power of 747.2 W kg −1 with 91.2% capacity retention after 10000 charge–discharge cycles at 8 A g −1 . And the ASC device also exhibits 91.7% capacity retention at floating time over 200 h at 8 A g −1 . Further, the MnCo 2 O 4 @CuCo 2 O 4 //AC device shows superior flexible performance while bending at various angles. These results make this MnCo 2 O 4 @CuCo 2 O 4 core/shell composite to be a good candidate for flexible all-solid-state electrochemical capacitors applications.