Preparation and electrochemical performance of lanthanum doping α-Ni(OH)_2

Lanthanum doping nickel hydroxide samples were prepared by chemical co-precipitation method. The structure characteristics of the lanthanum doping nickel hydroxide were analyzed by X-ray diffraction and infrared spectrum. The electrochemical performances of the lanthanum doping nickel hydroxide were studied by means of laboratory cell and cyclic voltammetry. The results show that the structure of the lanthanum doping nickel hydroxide is similar to that of α-nickel hydroxide, and it has a large interlayer distance, which is helpful for the diffusion of proton; OH-group in lanthanum doping nickel hydroxide is no longer at free structure phase, which interact with the molecule of water in the lattice. When the mole fraction of lanthanum doping is 6.32%, lanthanum doping nickel hydroxide has flat discharge curve, higher discharge plateau, higher deoxidation potential, higher oxygen evolution potential, and good cyclic reversibility.