Unique CoWO₄@WO₃heterostructured nanosheets with superior electrochemical performances for all-solid-state supercapacitors

Abstract

High performance asymmetric supercapacitors assembled with heterostructured core-shell CoWO4@WO3-1 cathodes and Ov-NiMoO4 anodes, showing a maximum area energy density of 13.93 mW h cm−2 and keeping 98.1% capacity retention over 20 000 cycles.

Advanced MnOx/MnWO4 hetero-nanoflakes with abundant oxygen vacancies for high-performance flexible asymmetric supercapacitors with high energy density

“…4e shows that the W 4f spectra can split into two peaks siting at 35.66 and 37.79 eV from W 4f 7/2 and W 4f 5/2 , respectively, which proved that W has been successfully doped into MnO x /MnWO 4 @C composites. 24 The C 1s spectrum in Fig. S3 † can split into three peaks, with the major peak of 284.89 eV representing the sp 2 hybridized carbon (CC bonds).…”

“…In addition, the areal energy density (E S , mW h cm −2 ) and areal power density ( P S , mW cm −2 ) of flexible supercapacitors were calculated using formulas (2) and (3) as follows:where I (mA), Δ t (s), Δ V (V) and S (cm 2 ) represent the discharge current, discharge time by GCD curves, voltage window of the device, and the total area of the double electrodes of the device, respectively. 23,24…”

“…where I (mA), Δt (s), ΔV (V) and S (cm 2 ) represent the discharge current, discharge time by GCD curves, voltage window of the device, and the total area of the double electrodes of the device, respectively. 23,24 Fig. 1 Schematic illustration of the preparation of MnO x @C and MnO x /MnWO 4 @C composites.…”

Synergistic effect of heterointerface engineering and oxygen vacancy in electro-spun polymer fibres derived carbon-supported 1D hierarchical WO3/SnO2 nanostructures for high-performance supercapacitor devices

“…For instance, Ma et al reported an areal-specific capacity of 578.6 mF cm −2 at 0.5 mA cm −2 for CoWO 4 @WO 3−1 with 53.9% retention in the rate capacity. 25 Pan et al , reported Ti 3 C 2 T x /WO x supported on flexible carbon cloth to deliver 164 F g −1 at 5 mA cm −2 . 26 The TiO 2 /WO 3 heterojunction with engineered O vac for a lowered work function and accelerated charge transmission at an electrochemical interface has also been reported (102 F g −1 at 1 A g −1 ; 97% retention).…”