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Abstract Supercapacitor is a new energy storage device between traditional capacitor and rechargeable battery. Not only has the characteristics of fast charging and discharging of capacitor, but also has the characteristics of energy storage of battery. The electrochemical tests indicate that the electrode in view of porous Ni 2 P 2 O 7 nanowires (NWs) has a specific capacitance of 772.5 Fg-1 at current density 1 Ag-1. Furthermore, porous Ni 2 P 2 O 7 NWs have been successfully applied to construct all-solid hybrid supercapacitors. Carbon nanotubes (CNT) and easily treated nickel pyrophosphate (Ni 2 P 2 O 7) are considered as electrode materials for supercapacitors under alkaline conditions. The equipment has a high energy density of 6.25 mWh cm−2 and good cycle stability of 94% capacitance retention after 3000 cycles, which identifies that porous Ni 2 P 2 O 7 nanowires are promising supercapacitor active materials. Highlights • A novel intercalated porous Ni 2 P 2 O 7 nanowires was prepared by simple chemical precipitation method. • The intercalated porous Ni 2 P 2 O 7 nanowires as new electrode materials exhibited great electrochemical properties. • Ni 2 P 2 O 7 //CNT ASC device is a promising material for fiber supercapacitors and electronic applications. [ABSTRACT FROM AUTHOR]

The unique three-dimensional (3D) porous structure of graphite carbon nitride (g-C 3 N 4) and vanadium pentoxide (V 2 O 5) was prepared by an environmentally friendly one-step solvothermal method, and its electrochemical performance was assessed. Importantly, g-C 3 N 4 is a low cost material with excellent chemical stability, and it supports the vertical charge transfer during the charge-discharge process, which promotes electronic transmission along this direction. In addition, V 2 O 5 has good theoretical capacitance and is deemed as a potential electrode material for next-generation supercapacitors. Field emission scanning electron microscopy of the nanocomposite revealed a 3D porous morphology for g-C 3 N 4 (3D PCN) and a spherical morphology for V 2 O 5. This study estimated the viability of the graphite carbon nitride-based nanocomposite PCN@V 2 O 5 as a new catalyst in the supercapacitor (SC) anodes. A series of SC anodes with different catalyst loadings were produced. The electrochemical behavior of the SC anodes was calculated by cyclic voltammetry (CV), charge-discharge and cycling test. When test in electrochemical performance, the ratio of PCN:V 2 O 5 is lower than 1:1 and 3D PCN@V 2 O 5 exhibits a lower specific capacity, the ratio of PCN:V 2 O 5 is higher than 1:1 that most of the pores in 3D porous g-C 3 N 4 are covered that reduces the electron transport rate and results in a lower specific capacity. Overall, 3D PCN@V 2 O 5 has higher specific capacity (457 Fg-1 at 0.5 Ag-1) and better cycling performance (approximately 84% after 500 cycles). This attractive performance indicates that 3D PCN@V 2 O 5 could be used as potential electrode materials for supercapacitors. • A novel 3D porous PCN@V 2 O 5 was prepared by simple chemical precipitation method. • The 3D porous PCN@V 2 O 5 as new electrode materials exhibited great electrochemical properties. • The 3D porous PCN@V 2 O 5 products are potential supercapacitor electrode materials for supercapacitors. [ABSTRACT FROM AUTHOR]