Abstract
In this work, CoMoO4@NiMoO4·xH2O core-shell heterostructure electrode is directly grown on carbon fabric (CF) via a feasible hydrothermal procedure with CoMoO4 nanowires (NWs) as the core and NiMoO4 nanosheets (NSs) as the shell. This core-shell heterostructure could provide fast ion and electron transfer, a large number of active sites, and good strain accommodation. As a result, the CoMoO4@NiMoO4·xH2O electrode yields high-capacitance performance with a high specific capacitance of 1582 F g−1, good cycling stability with the capacitance retention of 97.1% after 3000 cycles and good rate capability. The electrode also shows excellent mechanical flexibility. Also, a flexible Fe2O3 nanorods/CF electrode with enhanced electrochemical performance was prepared. A solid-state asymmetric supercapacitor device is successfully fabricated by using flexible CoMoO4@NiMoO4·xH2O as the positive electrode and Fe2O3 as the negative electrode. The asymmetric supercapacitor with a maximum voltage of 1.6 V demonstrates high specific energy (41.8 Wh kg−1 at 700 W kg−1), high power density (12000 W kg−1 at 26.7 Wh kg−1), and excellent cycle ability with the capacitance retention of 89.3% after 5000 cycles (at the current density of 3A g−1).
Highlights
A capacitance of 1039F g−1 at a current density of 1A g−1 and excellent rate capability, superior to single-phase NiMoO4·xH2O26
We report the flexible CoMoO4@NiMoO4·xH2O core-shell heterostructures cathode and Fe2O3 nanorods (NWs) anode directly grown on the carbon fabric for high-performance asymmetric solid-state supercapacitors
CoMoO4@NiMoO4·xH2O composites were prepared by a simple template-free hydrothermal process coupled with a calcination treatment
Summary
When changing the current density back to 15A g−1, the electrode can fully recover the specific capacitance of 1050F g−1 These results further indicate the CoMoO4@NiMoO4·xH2O electrode has excellent stabilities and rate performance. The above results reveal high specific capacity, excellent cycling stability, outstanding rate capability, and mechanically flexibility of the CoMoO4@NiMoO4·xH2O core-shell electrode. The porosity of the surface further shortens the diffusion paths for ions so that accelerate the redox reaction to take place and enhance the rate capability This 3D networked core-shell nanostructures on carbon fabric is a stale architecture with excellent mechanical robust and flexibility, which can improve the cycling stability during long-term cycling. In order to research the practical application of the as-prepared electrodes, flexible solid-state asymmetric supercapacitor device was assembled by using CoMoO4@NiMoO4·xH2O core-shell heterostructures as the cathode and the Fe2O3 NRs as anode, respectively. With an operating potential of 1.6 V, we achieve a much higher specific energy of for our asymmetric supercapacitors compared with the previous reported work[54,55,56,57,58,59]
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