One-step microwave-assisted solvothermal nano-manufacturing of Ni2P nanosphere as high-performance supercapacitors

Ni2P nanospheres were prepared by an ultrafast (120 s), easy, and energy-efficient one-step microwave method. By controlling the reaction conditions and feed ratio, Ni2P nanospheres with novel nanostructures and ultra-high electrochemical properties were prepared. These nanospheres demonstrated a high specific capacitance of 404.2 F g(-1) at 1 A g(-1) and high cycling durability. They maintain 81% of their initial capacity after 2000 cycles at 6 A g(-1). The optimum device based on Ni2P//AC showed an outstanding energy density of 27.2 Wh kg(-1) and power density of 375 W kg(-1). A method that is much faster and much more energy-efficient than other approaches was developed to produce transition metal phosphates without atmosphere protection.