In this paper, we report results obtained from the electrochemical characterization of MmNi(5-x)M(x) electrodes supported on nickel foam substrates. Results of structural and compositional characterizations are also presented. The results obtained in this work indicate that the MmNi(5-x)M(x) electrodes possess potential characteristics for hydrogen evolution reaction (HER) and for hydrogen storage. (C) 2000 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.