Electrochemical properties of the MmNi3.55Mn0.4Al0.3Co0.4Fe0.35 compound

Electrochemical hydrogenation of CeZr 2 Cr 4 Ni 5 –based alloys

“…The preparation of the working electrode was based on the "Latex" technology [22]: 90% of the active material is mixed with 5% of carbon black and 5% of polytetrafluoroethylen (PTFE). Two square pieces of 0.5 cm 2 of this Latex are pressed on each side of a nickel grid to prevent the electrode plate from breaking into pieces during the charge-discharge cycling [23]. Electrochemical tests were performed with a VMP Bio-logic instrument in a conventional three-electrode cell.…”

“…5a). The gradual increase of the discharge capacity during the first cycles was attributed to the activation of the electrode [23,35]. The repetitive insertion/ desertion of hydrogen into/from the bulk material results in pulverization and microcracking of the powder.…”

“…The repetitive insertion/ desertion of hydrogen into/from the bulk material results in pulverization and microcracking of the powder. Hence, the electrode surface area increases and the electrochemical properties are improved [23]. The capacity retention of as-prepared electrodes calculated after 100 cycles (S 100 ) of charge/discharge is 100%, which is much higher than many AB 3 -type hydride alloys [19,[36][37][38][39].…”

Electrochemical properties of the MmNi3.55Mn0.4Al0.3Co0.75−xFex (x=0.55 and 0.75) compounds

“…The chronopotentimmetry and then cyclic voltammetry methods are applied to determine the charge transfer coefficient, the hydrogen diffusion coefficient and the electrochemical stability of these two materials. These properties were compared to those published in our previous works [12,13] for x = 0 and 0.35.…”