D. Chartouni et al., ZRV1.5NI1.5 AS ELECTRODE MATERIAL IN NICKEL-METAL HYDRIDE BATTERIES -AN IN-SITU SCANNING-TUNNELING-MICROSCOPY INVESTIGATION, Journal of alloys and compounds, 260(1-2), 1997, pp. 265-270
We have investigated the alloy ZrV1.5Ni1.5 by means of scanning electr
on microscopy (SEM) with electron probe X-ray microanalysis (EPMA), X-
ray diffraction (XRD), in situ STM (scanning tunnelling microscopy in
an electrolyte under controlled electrochemical potential) and electro
chemical charge discharge measurements. By means of EPMA we found that
the alloy is composed of three different crystallographic phases. The
main phase (approximate to 75 vol.%) is ZrV0.81Ni1.47 the second phas
e (approximate to 20 vol.%) is V92Ni8 and the third (approximate to 5
vol.%) is a ZrNi based phase. Using in situ STM we investigated the di
fferent corrosion behaviour of the phases. At a potential of -600 mV v
ersus the Hg/HgO reference electrode we observed the corrosion of the
vanadium rich phase while the other two phases passivated. (C) 1997 El
sevier Science S.A.