α-MnS@Co3S4 hollow nanospheres assembled from nanosheets for hybrid supercapacitors

A high-performance hybrid supercapacitor by encapsulating binder-less FeCoSe2 nanosheets@NiCoSe2 nanoflowers in a graphene network

“…FCS@NCS-G2@NF(+)‖AC@NF)(−) demonstrates a 90.8% capacity retention together with a 98.8% coulombic efficiency, proving good cyclic longevity and electrochemical reversibility. 17,18 Fig. 7(H) also shows the first and last 6 cycles of the GCD plots, demonstrating the good reversibility and coulombic efficiency of the FCS@NCS-G2@NF(+)‖AC@NF)(−) apparatus.…”

“…carbon-based materials) as anodes and faradaic battery-type materials. 16–18 The enhancement of the energy density of hybrid supercapacitors depends strongly on the development of battery-like electrode materials as cathode electrodes. 19,20 The battery-like materials should possess copious electroactive sites for faradaic redox reactions, enough conductivity for effective charge transfer, a highly porous nature for rapid ion transport, and a high surface area for charge storage.…”

MOF-derived hierarchical core–shell hollow Co3S4@NiCo2O4 nanosheet arrays for asymmetric supercapacitors

“…26 The C-S bond (164.4 eV) suggests that there is coupling between Co 3 S 4 and rGO, and the binding energy at 168.9 eV originates from the oxidation of the sulfur species. 31,33 The O 1s spectrum of Co 3 S 4 @NiCo 2 O 4 /rGO/NF in Fig. 1f shows four signal peaks at 529.7, 530.4, 531.8 and 533.2 eV representing the metal-O binding (Ni-O and Co-O), intracrystalline hydroxide groups, oxygen defects and adsorbed water, respectively.…”

Facile and Controllable Synthesis of CuS@Ni-Co Layered Double Hydroxide Nanocages for Hybrid Supercapacitors

“…The electrochemical reaction kinetics of electrode material could be analyzed by a CV test. The relationship between peak currents ( i ) and scan rate (ν) could be calculated by the following equation 69 , 70 where a and b are both undetermined constants. The b value is evaluated by the slope of the fitted line of log(ν) vs log( i ), as displayed in Figure 6 a. Herein, b = 0.5 represents the electrochemical reactions of the electrode dominated by the diffusion-controlled process, while b = 1 indicates totally surface capacitive behaviors of the electrode material.…”

“…The electrochemical reaction kinetics of electrode material could be analyzed by a CV test. The relationship between peak currents (i) and scan rate (ν) could be calculated by the following equation 69,70…”