A NiSe–G∥AC asymmetric supercapacitor with both pseudocapacitance and EDLC mechanisms provides an energy density of 50.1 W h kg−1 and a power density of 816 W kg−1.

Restrained morphology and structural engineering of layered V2O5 by the oxidation of V-MXene to form a unique V2O5@V2C nanohybrids at different temperature and used as a cathode material for aqueous Zn-ion batteries (ZIBs).

No abstract

No abstract

A sonochemical route is used to prepare a few layers of MoSe2 and its 2D–2D nanohybrid is prepared with graphene by a solvothermal process. This nanohybrid exhibits a high specific capacitance of 945 F g−1. An ASC device MoSe2/G‖AC is fabricated, which delivers an energy density of 26.6 W h kg−1 and a power density of 0.8 kW kg−1.

No abstract

Cobalt selenide-graphene (CoSe-G) nanohybrid was successfully synthesised by a simple and facile onepot hydrothermal method and used as a positive electrode for an asymmetric supercapacitor. The CoSe-G nanohybrid electrode exhibits a higher specific capacitance of 1037 F g À1 at 5 mV s À1 than CoSe. The electrochemical impedance studies revealed that the graphene in the nanohybrid not only reduced the contact resistance of the electrode but also significantly increases the electrons transport. The good electrochemical performance of CoSe-G is the synergy between CoSe and graphene. In addition, the asymmetric supercapacitor (ASC) was fabricated using CoSe-G and activated carbon as the positive electrode and negative electrode, respectively, and electrospun PVdF membrane containing 6 M KOH as the separator as well as electrolyte. The fabricated ASC delivered an extended operating voltage window of 1.6 V. It also provides a higher energy density of 45.5 W h kg À1 and a power density of 1.1 kW kg À1 and retains 81% of its initial specific capacitance even after 5000 cycles.

Electrospun high‐voltage spinel‐typeLiNd0.01Mn1.99O4 nanofibers (LNdMO NFs) were successfully prepared through the electrospinning technique. The thermal behavior of the electrospun precursor fibrous mat was assessed by thermogravimetric/differential thermal analysis. The crystallite structure and phase purity of Nd3+‐doped LiMn2O4 was confirmed by X‐ray diffraction studies. The chemical structure of the electrospun LNdMO NFs was characterized by Raman spectroscopy studies. The morphology of the nanofibers was examined by using field‐emission scanning electron microscopy. A Li‐ion capacitor (LIC) coin cell was fabricated by using high‐voltage insertion LNdMO NFs as the cathode and black pearl carbon as the anode with electrospun PVdF membrane containing 1 M LiNO3 as the separator and electrolyte. The electrochemical performance of the assembled LIC coin cell was characterized by using cyclic voltammetry, galvanostatic charge−discharge and electrochemical impedance spectroscopy. The LIC was capable of operating over wide potential window of 1.6 V with excellent capacitance retention of 86 % even after 2500 continuous galvanostatic charge−discharge cycles at a constant current density of 1 A g−1. Furthermore, LIC delivered an energy density of 17 Wh kg−1 and a power density of 397 W kg−1. Moreover, these results show that Nd3+‐doped LiMn2O4 NFs can be considered a promising electroactive cathode material for LICs.