Interlaced nickel phosphide nanoflakes wrapped orthorhombic niobium pentoxide nanowires array for sustainable aqueous asymmetric supercapacitor

Hierarchical Nickel–Cobalt Phosphide/Phosphate/Carbon Nanosheets for High-Performance Supercapacitors

“…31 Therefore, the optimum working voltage window of 0−1. reach 37.59 Wh kg −1 and still achieves 21.89 Wh kg −1 at a corresponding power density of 8000 W kg −1 , outperforming many of the previously reported energy storage devices, such as NiCoP/NiCo-LDH//PC (775 W kg −1 and 34 Wh kg −1 ), 30 S-NiCoP//AC (7700 W kg −1 and 16.65 Wh kg −1 ), 45 NiCoP@ NF//AC (647 W kg −1 and 27 Wh kg −1 ), 50 T-Nb 2 O 5 @Ni 2 P/ C//AC (453 W kg −1 and 30.2 Wh kg −1 ), 51 and Ni-CoP@C@ CNT//GO (699.1 W kg −1 and 17.4 Wh kg −1 ). 52 Furthermore, the Ni−Co−P/PO x /C/NF//RGO/NF device shows excellent cycling stability with a retention of 83.6% at 15 A g −1 after 5000 cycles (Figure 6f).…”

Assembly of Metal–Organic Frameworks on Transition Metal Phosphides as Self-Supported Electrodes for High-Performance Hybrid Supercapacitors

“…As shown in Figure S9c, when the current density is 1 A/g, the HSC device exhibits an excellent specific capacitance of 124.7 F/g. From Figure 5e, it can be clearly seen that the HSC shows a high energy density of 44.33 W•h•kg −1 at a power density of 800 W•kg −1 , which was much higher than that of other materials, such as Ni/Co-MOF-74-5//AC (24.4 W•h•kg −1 at 784.2 W•kg −1 ), 4 Ni-MOF//AC (21.05 W•h•kg −1 at 440 W• kg −1 ), 30 NiCoP/Ni−Co−OH//PC (34 W•h•kg −1 at 775 W• kg −1 ), 31 S−NiCoP-2-300//AC (43.54 W•h•kg −1 at 150 W• kg −1 ), 14 T-Nb 2 O 5 @Ni 2 P//AC (30.2 W•h•kg −1 at 453 W• kg −1 ), 32 and NiCoP@NF//AC (27 W•h•kg −1 at 647 W• kg −1 ). 33 In addition, Figure 5f shows that the HSC device has excellent stability after 5000 charge and discharge cycles at 10 A/g, the retention rate is 83.04%, and the Coulombic efficiency can still maintain 94.89%, which suggests a good reversible charge storage mechanism.…”

Status review of nickel phosphides for hybrid supercapacitors

“…The synthesis of NPs can be carried out by various strategies, such as hydrothermal, 43,62–72 solvothermal, 73–83 electrodeposition, 58,84–86 ball milling, 87 phosphorization, 88–93 colloidal synthesis, 94 chemical vapour deposition. 95 Various interesting morphologies of NPs have been reported, including nanoparticles, 68,71,73,75–77,81,83,91,92 nanospheres, 66,85 nanoflakes, 80,86 nanofibres, 82 nanorods, 88 nanosheets, 43,62–64,89 nanotubes, 65 nanocapsules, 72 nanoplates, 59,94 nanowires, 96 microspheres, 70,74,78,90 and microstructures. 87,93 The different nano/microstructures and morphologies of NPs exhibit diverse electrochemical activities (Table 2).…”

“…A new porous core–shell nanocomposite based on rhombic niobium pentoxide (T-Nb 2 O 5 ) nanowires and metal phosphorus nanofibres to achieve a simple, cost-effective energy-storage system at a realistic level was reported by Wang and co-workers. 80 The working electrode was reasonably designed and developed by an effective solvothermal and phosphoryzation approach. The T-Nb 2 O 5 nanowires played a structural orientation role in the directional growth of hierarchical ultrafine porous nickel (Ni 2 P) nanocottons, which offered high conductivity, a significant SSA, and sufficient sites where redox activity could take place.…”