Ni2P grown in situ on milled black phosphorus flakes and its high energy storage performance

Ni2P and black phosphorus (BP) exhibit their respectively excellent performance in capacitance. Flake material BP is a good phosphorus (P) source candidate for the synthesis of Ni2P, and is also a good carrier that can contribute to the good dispersion of Ni2P particles. Herein, BP flakes were prepared first by wet milling method and Ni2P/BP composites with different reactant mole ratio for nickel (Ni) to P were prepared by a facial solvothermal method. The electrochemical property of milled BP flakes and Ni2P/BP composites were investigated by cyclic voltammetry, charge/discharge and electrochemical impedance spectroscopy. It was found that the Ni2P/BP composite, with an appropriate reactant mole ratio for Ni to P, had the high capacity of 1215 F/g at the current density of 1 A/g and the remained stable capacity of 590 F/g after 1000 circle at the current density of 2 A/g, exhibiting good capacitance energy storage performance. (C) 2019 Elsevier B.V. All rights reserved.