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Abstract The specific surface area and pore size of illustrative electrode material is a promising task to achieve better performance of energy storage devices. In this respect, Mg-substituted Ni 1-x Mg x Co 2 O 4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) samples were synthesized by cost-effective and facile hydrothermal method. As-prepared samples were evaluated as the electrode material for a battery application. The structural and electrochemical characterization analysis has been carried out systematically. Among different samples, NMC50 (x = 0.5) exhibit highest BET surface area of 61 m2g-1 with a suitable pore volume of 0.3029 cm3g-1 and narrow pore size distribution of 2–10 nm. It is verified that the special features of the NMC50 including uniformity of the surface texture and porosity bring significant effect on the electrochemical performances. Consequently, the excellent specific capacity of 302 mAhg−1 is observed for NMC50 sample at a current density of 1.1 Ag-1 and a remarkable cyclic stability of ∼95% is maintained over 2000 continuous charge-discharge cycles. The improved electrochemical performance of NMC50, undoubtedly makes it worth as an excellent electrode material for high-performance energy storage applications. Graphical abstract Image [ABSTRACT FROM AUTHOR]

• Tetracyanoquinodimethane doped HKUST-1 has been explored as a battery type material. • A high specific capacity of 208.8 mAh/g (751 C/g) at 2 A/g has been achieved. • Solid-state symmetrical device has delivered high energy and power densities of 70.5 Wh/kg and 0.83 kW/kg respectively. • The energy storage device has yielded an energy efficiency of 58.6% and cyclic stability of 96%. Metal-organic frameworks (MOFs) are emerging as potential electrode materials for next-generation energy storage devices. Cu 3 (BTC) 2 (BTC = benzene tricarboxylate), also known as HKUST-1, is one of the most widely studied MOFs. In the present work, TCNQ (tetracyanoquinodimethane) doped HKUST-1, has been demonstrated as an efficient energy storage electrode material. The infiltration of TCNQ in HKUST-1 has resulted in the synthesis of a high surface area electrode material with significant electrical conductivity. TCNQ@HKUST-1 based electrode has delivered a high specific capacity of 208.8 mAh/g (751 C/g) at a current density of 2 A/g. An all-solid-state symmetrical device has been assembled using a polymer gel electrolyte, which has delivered energy and power densities of 70.5 Wh/kg and 0.83 kW/kg, respectively. Also, the device showed a maximum energy efficiency of 58.6% along with a long cycle life of 96% over 5000 successive charging-discharging cycles. The present system has yielded superior energy storage performance than most of the earlier reported MOF based electrodes. [Display omitted] [ABSTRACT FROM AUTHOR]

Transition metal dichalcogenides (TMDs) are gaining interest in the energy sector due to its 2D chemistry and heterogeneous characteristics however its stability for the long run and poor electrical conductivity are pushing the researchers to make their hybrid. Herein we synthesized the hybrid WS 2 nanorods and Co 3 S 4 microspheres composite material which attained a high energy density of 47.3 Wh/kg along at a high-power density of 512 W/kg. The hollow Co 3 S 4 microspheres were synthesized using highly porous ZIF-67 as a precursor. Furthermore, these hollow Co 3 S 4 microspheres are in-situ modified by combining with WS 2 nanostructures to enhance its energy density. The electrodes with the synthesized hybrid material deliver the specific capacitance of 412.7 F/g at the current density of 1 A/g, Additionally, two equal weighted Co 3 S 4 /WS 2 composite electrodes are used to fabricate an all-solid-state symmetrical supercapacitor device with PVA-1M H 2 SO 4 polymer gel electrolyte, exhibiting a wide potential window of 2 V with 92% cyclic stability (2000 charge-discharge cycles) demonstrates its potential applicability for the supercapacitor application. The excellent electrochemical performance and splendid cyclic stability are attributed to the synergy of high surface area ZIF-67 derived Co 3 S 4 microsphere for fast charge transfer with 2D networked WS 2 material responsible to provide high energy density. Image 1 • A hybrid Co 3 S 4 /WS 2 composite was prepared using a one-step solvothermal method. • The hybrid composites deliver the highest specific capacitance of 412.7 F/g at the current density of 1 A/g. • A solid-state symmetrical supercapacitor was assembled with PVA-1M H 2 SO 4 gel electrolyte as a separator. • With wide potential window of 2 V, the fabricated device attained a high energy density of 47.3 Wh/kg along at a high-power density of 512 W/kg. [ABSTRACT FROM AUTHOR]