Effects of Alkaline Pre-Etching to Metal Hydride Alloys
AbstractThe responses of one AB5, two AB2, four A2B7, and one C14-related body-centered-cubic (BCC) metal hydrides to an alkaline-etch (45% KOH at 110 °C for 2 h) were studied by internal resistance, X-ray diffraction, scanning electron microscope, inductively coupled plasma, and AC impedance measurements. Results show that while the etched rare earth–based AB5 and A2B7 alloys surfaces are covered with hydroxide/oxide (weight gain), the transition metal–based AB2 and BCC-C14 alloys surfaces are corroded and leach into electrolyte (weight loss). The C14-predominated AB2, La-only A2B7, and Sm-based A2B7 showed the most reduction in the internal resistance with the alkaline-etch process. Etched A2B7 alloys with high La-contents exhibited the lowest internal resistance and are suggested for use in the high-power application of nickel/metal hydride batteries. View Full-Text
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Meng, T.; Young, K.-H.; Hu, C.; Reichman, B. Effects of Alkaline Pre-Etching to Metal Hydride Alloys. Batteries 2017, 3, 30.
Meng T, Young K-H, Hu C, Reichman B. Effects of Alkaline Pre-Etching to Metal Hydride Alloys. Batteries. 2017; 3(4):30.Chicago/Turabian Style
Meng, Tiejun; Young, Kwo-Hsiung; Hu, Chaolan; Reichman, Benjamin. 2017. "Effects of Alkaline Pre-Etching to Metal Hydride Alloys." Batteries 3, no. 4: 30.