Metal Hydride Electrode With Different Particle Size

Abstract

The behavior of the negative electrode in rechargeable alkaline Ni/MH batteries, depends on factors such as hydrogen storage capacity, kinetics processes occurring at the interface metal/ electrolyte and transport of hydrogen within the bulk of the metal alloy. The particle size of the alloy is a parameter to consider during the design of these, as they affect system performance. The aim of this work was to study how the alloys particle size affects the electrochemical performance of the electrode. The electrode were prepared using different particle size and were characterized using basic electrochemical techniques (cyclic voltammetry, charge/discharge cycling, electrochemical impedance spectroscopy (EIS), and optical techniques (scanning electron microscopy (SEM)) allowed to determine kinetic parameters of the hydriding–deshidruration reaction, transport of H in the alloys and structural parameters electrode.