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The La 1- x Ce x (NiCoMnAl) 5 alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH 4. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging capability of alloy electrodes were tested. The surface morphology and element content were observed by scanning electron microscope. The results show that the alloy electrode is fully activated after the second charging discharging cycle and has a high rate discharging capability of 85% at 900 mA/g. The surface has a lot of micro cracks and hydrogen diffusion coefficient is about (2～3)×10 -9 cm 2/s . Therefore, this method can markedly improve activation behavior and high rate charging capacity of the alloy electrode. The mechanism of this surface modification of the alloy electrode is also discussed. [
The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging ability of alloy electrodes were tested. The surface of La 1- x Ce x (NiCoMnAl) 5 alloy electrodes were treated by hot charging in alkaline aqueous solution containing KBH morphology and element content were observed by scanning electron microscope. The results show that the alloy electrode is fully activated after the second charging discharge cycle and has a high rate discharging capability of 85% at 900 mA / g. The surface has a lot of micro cracks and hydrogen diffusion coefficient is about (2 ~ 3) × 10 -9 cm 2 / s. The mechanism of this surface modification of the alloy electrode is also discussed. [