Discharging characteristics of CoB nano powders

Facile synthesis of Co2P via the reduction of phosphate with KBH4 for nickel-based rechargeable batteries

“…8. Both samples show one pairs of anodic and cathodic peaks located at about À0.7 and À1.0 V (vs. Hg/HgO), respectively, which are similar to those reported Co-based anode materials [16][17][18][19][20][21][22][23][24][25]. Therefore, the charge-discharge process of Co-P and Co 2 P electrodes is attributed to the conversion reaction: Co + 2OH À M Co(OH) 2 + 2e.…”

“…Among these systems, Ni/MH battery is widely used owing to their outstanding features of high energy density, high power, environmental issue, and safety [5][6][7][8][9][10][11][12]. In recent years, several studies have focused on Co-based materials as anode materials for nickel-based rechargeable batteries [16][17][18][19][20][21][22][23][24][25]. As the charge/discharge capacities of these materials are based on the redox of Co/Co(OH) 2 , Gao et al [25] defined this new type of nickel-based rechargeable battery as Ni/Co battery.…”

“…However, as you know, Co is relatively expensive for practical applications. Therefore, much effort has been put into the design of Co-metalloid alloys with excellent electrochemical properties to reduce their cost [16][17][18][19][22][23][24].…”

Nanoscaled Metal Borides and Phosphides: Recent Developments and Perspectives

“…Some reports are still considering the formation of metal boron hydrides as plausible, ,,, but recent works ,, nicely reviewed by Zhao et al lead to the current consensus that hydrogen sorption has only a minor contribution to energy storage. Indeed, crystalline cobalt borides Co 3 B, Co 2 B , and CoB , have also good capacity and cycling stability, even if they do not show any significant hydrogen sorption. ,, Although differences between amorphous and crystalline metal borides both in terms of crystal structure and particle size/surface area hinder direct comparison of their performances (ranging between 250 and 350 mA h g –1 after 100 cycles), the common mechanism seems to be similar to the oxidation–reduction process described above for boron-rich metal borides in primary alkaline batteries. The charge reaction corresponds to reduction of the Co hydroxide into elemental Co, similar to the reaction occurring in Ni–Cd batteries: CoB x + ( 2 + 6 x ) OH − → Co false( OH false) 2 ( s ) + x BO 3 3 − + 3 x normalH 2 normalO + ( 2 + 3 x ) normale − Co false( OH false) 2 ( s ) + 2 normale − → Co ( s …”

“…Indeed, crystalline cobalt borides Co 3 B, 833 Co 2 B 830,833 and CoB 431,833 have also good capacity and cycling stability, even if they do not show any significant hydrogen sorption. 431,828,835 Although differences between amorphous and crystalline metal borides 836 both in terms of crystal structure and particle size/surface area hinder direct comparison of their performances (ranging between 250 and 350 mA h g −1 after 100 cycles), the common mechanism seems to be similar to the oxidation−reduction process described above for boron-rich metal borides in primary alkaline batteries. The charge reaction corresponds to reduction of the Co hydroxide into elemental Co, similar to the reaction occurring in Ni−Cd batteries:…”