The electrochemical hydrogen sorption behaviour of Zr-Cu-Al-Ni metallic glasses : Special issue on hydrogen absorbing materials

N. Ismail, M. Uhlemann, A. Gebert, J. Eckert, L. Schultz
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引用次数: 6

Abstract

Amorphous Zr-Cu-Al-Ni alloys are of interest for hydrogenation studies because they consist of a combination of early and late transition metals. Potentiodynamic polarisation tests were conducted to investigate the cathodic hydrogen reduction reactions on the surface of melt-spun Zr 55 Cu 30 Al 10 Ni 5 and Zr 65 Cu 17.5 Al 7.5 Ni 10 ribbons. In the Tafel region, the electrodic desorption reaction is the rate-determining step which competes with the hydrogen absorption reaction. In the next polarisation region, the hydrogen reduction takes place under mass transfer-control. The ribbons are galvanostatically charged with hydrogen to different hydrogen-to-metal ratios in 0.1 mol/l NaOH solution. The rate of hydrogen absorption of the Zr 55 Cu 30 Al 10 Ni 5 alloy is higher than that of the Zr 65 Cu 17.5 Al 7.5 Ni 10 alloy, although the hydrogen discharge rate on the surface of the Zr 65 Cu 17.5 Al 7.5 Ni 10 alloy is higher. Upon charging the samples at room temperature to H/M = 1.3 using a low charging rate (-1 mA/cm 2 ), the X-ray diffraction pattern show the main peaks of a Zr-hydride and Cu and/or a Cu rich phase(s) besides the amorphous phase. The potentiostatic double-pulse technique (PDP) was applied to estimate the fraction of reversibly absorbed hydrogen in the amorphous alloy samples by charging at different cathodic potentials. Subsequently, the residual hydrogen concentration (irreversibly absorbed hydrogen) was determined by hot extraction. The Zr 55 Cu 30 Al 10 Ni 5 alloy was found to absorb a higher fraction of reversible hydrogen than the Zr 65 Cu 17.5 Al 7.5 Ni 10 alloy.
Zr-Cu-Al-Ni金属玻璃的电化学吸氢行为:吸氢材料专刊
非晶Zr-Cu-Al-Ni合金是氢化研究的热点,因为它们由早期和晚期过渡金属组成。采用动电位极化实验研究了熔融纺丝Zr 55 Cu 30 Al 10 Ni 5和Zr 65 Cu 17.5 Al 7.5 Ni 10带表面的阴极氢还原反应。在塔菲尔区,电解吸反应是与氢吸收反应竞争的速率决定步骤。在下一个极化区,氢还原发生在传质控制下。在0.1 mol/l的NaOH溶液中,以不同的氢金属比对带进行恒电流充电。Zr 55 Cu 30 Al 10 Ni 5合金的吸氢率高于Zr 65 Cu 17.5 Al 7.5 Ni 10合金,但Zr 65 Cu 17.5 Al 7.5 Ni 10合金表面的氢放电率更高。在室温下以低充电速率(-1 mA/ cm2)将样品充电至H/M = 1.3时,x射线衍射图显示出除非晶相外的主要峰为zr -氢化物和Cu和/或富Cu相。采用恒电位双脉冲技术(PDP)测定了在不同阴极电位下充电的非晶合金样品中可逆吸收氢的比例。随后,用热萃取法测定残余氢浓度(不可逆吸收氢)。Zr 55 Cu 30 Al 10 Ni 5合金比Zr 65 Cu 17.5 Al 7.5 Ni 10合金吸收了更高比例的可逆氢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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