An electrochemical study of new La1-xCexY2Ni9 (0 <= x <= 1) hydrogen storage alloys

New ternary yttrium-based alloys belonging to the R-Y-Ni system (R= La. Ce) , with general formula La1-xCexY2Ni9 (0 less than or equal to x less than o r equal to 1) have been synthesized, and their hydrogen absorption -desorpt ion properties have been investigated through solid gas and electrochemical measurements. The thermodynamic data determined here (hydrogen absorption capacities and hydride formation pressures) are consistent with their appli cation as negative electrode materials in alkaline medium. The electrochemi cal study shows promising results for La-rich compositions in terms of disc harge capacity. rate capability and cycling behavior. The influence of ceri um substitution on the negative electrode behavior is discussed. (C) 2001 E lsevier Science Ltd. All rights reserved.