Abstract
The alkaline treatment of the surface of a Ti–Cr hydrogen storage alloy was made by sticking potassium (K) metal onto the alloy block surface or by milling the alloy powder with K metal blocks instead of the use of KOH solution. This dry surface treatment was found effective to reduce the work function of electrons of the alloy surface and to ease the rate of hydrogen dissociation, resulting in an accelerated activation rate. The K atoms were found distributed in the surface oxide layer; however, X-ray photo spectroscopy (XPS) analyses in the vicinity of Fermi level suggest rather the induction of a metallic feature of the surface modified by K atoms.
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