Improved electrochemical performance of BCC alloy by Ni addition and surface modification with AB5 alloy

Electrochemical characteristics of AB5-type hydrogen storage alloys

“…The electrochemical reactions taking place at the electrode/electrolyte interface inside each electrode during charging and discharging can be represented as follows: (3) where M is the hydrogen storage alloy, H ads the adsorbed hydrogen on the surface of the alloy, H abs the absorbed hydrogen in the bulk, and H hyd is the metal hydride [18,19]. Reaction (1) reflects the charge-transfer process at the interface between the MH alloy powder and the electrolyte, Reaction (2) is transfer from adsorbed to absorbed state and Reaction (3) represents the diffusion of hydrogen from the surface to the bulk.…”

“…AB 5 hydrogen storage alloys have now been widely used as negative electrode (anode) materials for Ni-MH rechargeable batteries. Much research has been performed in order to improve the overall properties of the AB 5 alloys and to develop new types of alloy electrodes, used as the negative electrode materials of the Ni/MH battery [1][2][3][4][5][6][7][8][9][10][11]. The performance of these electrodes is determined by both the kinetics of the processes occurring at the metal/solution interface and the rate of hydrogen diffusion within the bulk of the metal alloy particles.…”

Hydrogen storage and electrochemical characteristics of Ti0.32Cr0.43−V0.25Fe (x= 0–0.08) alloys and its composites with LmNi4.1Al0.25Mn0.3Co0.65 alloy

“…In previous studies, the catalytic activity and discharge capacity of bcc type Ti 0.32 Cr 0.43 V 0.25 alloy were improved either by ball-milling the alloy with the more active AB 5 type LmNi 4.1 Al 0.25 Mn 0.3 Co 0.65 (Lm: lanthanum-rich mischmetal) alloy [22][23][24][25] or by substituting Mn for Cr in the alloy and ballmilling it with an AB 5 type alloy [14]. The more active LmNi 4.1 Al 0.25 Mn 0.3 Co 0.65 (Lm: lanthanum-rich mischmetal) alloy was embedded in the surface of the Ti 0.32 Cr 0.43 V 0.25 base alloy through the ball-milling thereby forming a path for hydrogen penetration into the bcc alloy.…”

Process analysis of electroless copper plating for AB5-type hydrogen storage alloy using support vector regression

“…To improve the electrochemical property of hydrogen storage alloy electrode in nickel-metal hydride battery, several types of surface modification have been studied in recent literatures. Surface modification for hydrogen storage alloy, which covers the intermetallic powder to prevent corrosion or oxidation, is an effective strategy to improve nickel-metal hydride battery performance (Matsuoka et al, 1993;Yan et al, 1995;Shen et al, 2010;Yu et al, 2009;Raju et al, 2009;Deng et al, 2006). Feng and Northwood (2004) studied the electrochemical properties of metal hydride (MH) electrode micro-encapsulated Cu, which showed higher exchange current density and apparent activation energy when compared with untreated ones.…”