Abstract The electrochemical hydrogen absorption/desorption behavior of a crystalline and an amorphous Zr 36 (V 0.33 Ni 0.67 ) 64 alloy sample was investigated. Electrodes made of the crystalline sample show a much lower resistance and consequently a higher discharge capacity compared to the electrodes made of the amorphous alloy. The XPS surface analysis did not explain the difference, we observed almost exactly the same depth profile on both samples. However the surface of the activated alloy compared to the non-activated was drastically changed. The oxide layer on an amorphous alloy seems to grow in a much more compact and stable structure than the oxide layer on a crystalline sample.
Andreas Züttel, Daniel Chartouni, Christof Nützenadel
Journal of Alloys and Compounds