The Morphology Evolution of Nickel Phosphite Hexagonal Polyhedrons and Their Primary Electrochemical Capacitor Applications

Abstract

Nickel posphite (Ni11(HPO3)8(OH)6) hexagonal polyhedrons are successfully synthesized under hydrothermal conditions. The effect of surfactants on the growth mechanism of Ni11(HPO3)8(OH)6 are also explored. More importantly, Ni11(HPO3)8(OH)6 hexagonal polyhedrons are successfully applied as electrochemical supercapacitor electrode materials, which have a good specific capacitance (295 F g−1 at 0.625 A g−1), good rate capability, and cycling properties (maintained about 99.3% at 0.625 A g−1 after 1000 cycles).

A high energy density asymmetric supercapacitor utilizing a nickel phosphate/graphene foam composite as the cathode and carbonized iron cations adsorbed onto polyaniline as the anode

“…For instance, Huan et al synthesized Ni 11 (HPO 3 ) 8 (OH) 6 under the hydrothermal condition and reported a high specific capacitance of 295 F g −1 (32 mA h g −1 ) at a current density of 0.625 A g −1 in a 3.0 M KOH electrolyte. 19 Manickam et al synthesized NaNiPO 4 using the facile hydrothermal method and obtained a high specific capacitance of 125 F g −1 (4.17 mA h g −1 ) at a current density of 1.0 A g −1 in a 2.0 M KOH. 20 Ni 3 (PO 4 ) 2 can be synthesized by different methods, but the hydrothermal method is a facile and rapid method that can offer unique morphologies, energy saving, simplicity, high purity and crystalline material.…”

Room temperature synthesis of cobalt-manganese-nickel oxalates micropolyhedrons for high-performance flexible electrochemical energy storage device

“…High-performance energy conversion-storage devices have been receiving a lot of research attention recently 1 2 3 4 5 . Electrochemical capacitors, also known as supercapacitors (SCs), are widely regarded as suitable candidates for the next generation power source owing to their high power density, high stability and low fabrication cost 6 7 .…”

Strategically Tuned Ultrathin Nickel Phosphate Nanosheet Thin-Film Electrode as Cathode for High-Power Hybrid Supercapacitor Device

“…Nowadays, metal phosphates have been attracting much attention for application in energy storage devices and catalysis due to their low cost, high conductivity, and redox reversibility. , Besides such excellent properties, very few metal phosphate materials have been prepared, and limited performances are reported. Among them, nickel-based phosphate materials were synthesized by several chemical methods such as calcination, hydrothermal, co-precipitation, microwave-assisted, and sonochemical methods. − Various forms and microstructures of nickel phosphate are prepared by different research groups and their supercapacitive performances are reported. Omar et al prepared Ni 3 (PO 4 ) 2 and studied the effect of calcination temperature on the structure, morphology, and supercapacitive performance.…”

“…Li et al prepared a composite of Ni 3 (PO 4 ) 2 and graphene oxide (GO) by the simple precipitation method. Also, Ni 20 [(OH) 12 (H 2 O) 6 ]­[(HPO 4 ) 8 (PO 4 ) 4 ]·12H 2 O (VSB-5), nickel pyrophosphate (Ni 2 P 2 O 7 ), and nickel phosphite [Ni 11 (HPO 3 ) 8 (OH) 6 ] are prepared by some research groups using simple hydrothermal and co-precipitation methods and studied their supercapacitive performance. − Among numerous synthetic approaches, the chemical bath deposition (CBD) method is prevalent for binder-free preparation of thin-film electrodes . In various works, the effects of reaction time, calcination time, core–shell structure, composite, and doping on nickel phosphate are studied, and the corresponding supercapacitive performances are reported.…”