ON THE CHARGE DISCHARGE BEHAVIOR OF TI2NI ELECTRODE IN 6 M KOH AQUEOUS AND DEUTERIUM-OXIDE SOLUTIONS/

The present work provides a preliminary study of our neutron diffracti on analysis on the Ti2Ni hydrogen storage alloy electrode. The dischar ge behavior of Ti2Ni alloy electrodes in 6 M KOH aqueous solution was observed to be very different from that found in 6 M KOH deuterium oxi de solution. An a.c. impedance technique was therefore applied to inve stigate the frequency response during the charge/discharge process of the electrode in each solution. The impedance spectra obtained reveale d an apparent variation of reaction resistance of the electrode discha rged in 6 M KOH+H2O and in 6 M KOH+D2O, indicating a significant varia tion of electrode charge/discharge kinetics. The present work provides a further understanding of the charge/discharge kinetics of Ti2Ni ele ctrode in heavy water thus supplementing the neutron diffraction studi es of the electrochemical hydrogen storage behavior of Ti2Ni intermeta llic compound. (C) 1998 Elsevier Science S.A.