Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 24, Pages 13387-13397Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.03.041
Keywords
Hydrogen storage alloy; Amphoteric additions; Electrode cycling; Selective leaching; Material activation
Categories
Funding
- Polish Ministry of Science and Higher Education [0401/0157/18]
- Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology [BS/PB-207 3011/09 (2017)]
- Faculty of Mathematics and Natural Sciences of Jan Dlugosz University in Czestochowa [DS/WMP/6004/2018]
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Long-lasting charge/discharge cycling (-0.5C/+0.5C) of a super-stoichiometric hydrogen storage alloy with LaNi4.5Co0.5Al0.32Sn0.34Zn0.10 composition has been carried out in a 6 M KOH solution to evaluate the role of selective dissolution of amphoteric elements (Al, Sn and Zn) in electrochemical hydrogenation properties and corrosion behaviour of the hydride electrode. Among alloy constituents, leaching efficiency is the most evident for Sn and Zn additions. Rates of Ni and Co leaching are 2 orders of magnitude lower whereas La is not leached at all. Selective leaching of Al, Sn and Zn is prone to improved material activation and has a minor effect on material passivation and capacity fade. Selective leaching of amphoteric elements as a result of alkaline cycling follows a first-order chemical kinetics law. (C) 2020 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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