<span style="font-size:14.0pt;line-height: 115%;font-family:"Times New Roman";mso-fareast-font-family:Fd1596850-Identity-H; color:black;mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language: HI" lang="EN-IN">Electrochemical characterization of LaNi₅ hydride electrode</span>

Abstract

Galvanostatic, cyclic voltammetric and linear polarization characteristics of LaNi₅electrode with respect to cycling are presented. Variation in voltammetric charge-discharge current and potential values observed during cycling are discussed. Cyclic voltammetric redox currents are correlated with respective steps in P-C isotherms of LaNi₅ – H₂ system. The stepwise reactions taking place at the LaNi₅ electrode like in normal gaseous mode of hydrogenation is established.Values of the exchange current density of LaNi₅ electrode increases during cycling. Evolved gas analysis establishes the electrochemical hydrogen storage. Evolution of hydrogen from b-hydride phase takes place at room temperature, while from a-phase, hydrogen evolves at higher temperatures. Microscopic analysis indicates that microcracks in LaNi₅ electrodes appear due to electrochemical cycling.