Effect of substitution of Mm for La on the electrochemical properties of the LaNi3.55Mn0.4Al0.3Co0.75 compound

A comparative study, of 1M and 8M KOH electrolyte concentrations, used in Ni–MH batteries

“…16 the Nyquist plots and modelling of EIS spectra of the The capacitance value for the high frequency region (C∼24 F cm −2 ) is consistent with the double layer capacitance expected at the metal-solution interface [12]. Hence, the high frequency semi-circle can be mainly regarded as the charge transfer process, as previously reported [13][14][15]. The exchange current density values I 0 , deducted from the charge transfer resistance R tc , using the equation, I 0 = RT/nFR tc , where RT/nF = 26 mV at T = 298 K, are 15 mA cm −2 and 22 mA cm −2 , respectively, in 1 M and 8 M KOH electrolytes.…”

Electrochemical characteristics of AB5-type hydrogen storage alloys

“…So the diffusion of hydrogen is influenced not only by its concentration but also by structural change of the metal hydride from the phase ␣ to the phase ␤ at low SOC, but these influences are absent at high SOC. Various authors [36][37][38][39][40][41][42][43][44] have reported values of hydrogen diffusion coefficient between 10 −6 and 10 −14 cm 2 s −1 for metal hydride alloys, which agree with our results. Such wide variations in the values for the diffusion coefficient for similar types of alloys could be attributed to variations in the microstructure, metal stoichiometry and composition of the alloys.…”

Electrochemical impedance study of discharge characteristics of Pd substituted MgNi-based hydrogen storage electrode alloys

“…With Randles plotting, that is plotting Z with ω −1/2 (ω = 2 f ) for a low-frequency Warburg response, the Warburg coefficient can be obtained by measuring the slope of such plots [29][30][31][32]. Fig.…”