Abstract:

Hydrogen storage composite electrode Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/x wt%Ni was prepared by dry method and wet method (x=0~300), the electrochemical properties and PCT characteristics of the alloy electrode were measured by electrochemical method, and the phase structure and micro morphology of the composite hydrogen storage electrode were also analyzed. The results show that when the hydrogen storage electrode was added with hydroxyl nickel powder, the pressure of hydrogen desorption platform of PCT curve at 288K, 298K and 308K were lower than the platform pressure with x=0, in which the platform pressure is small when x=200; There are only CaCu5 LaNi5 phase and Ni phase in the composite hydrogen storage electrode, with the increase of hydroxyl nickel powder content, the diffraction peak of Ni gradually increased, and LaNi5 phase peak height decreased, together with the FWHM broadening, when x=200, the PCT platform width of the alloy electrode is the biggest and the platform slope is the minimum; The Mm0.3Ml0.7Ni3.55Co0.75Mn0.4Al0.3/200Ni electrode has the best electrochemical performance in the range of the electrode composition studied.

Key words: hydrogen storage alloy, hydroxyl nickel powder, PCT characteristics, electrochemical performance