The performance of alkaline borohydrides on Ag anode was tested in a three-electrode system in this research. The anode compartment was separated from other compartments by Nafion 117 membranes. It was observed that the cell potential increased with increasing BH4- concentration. When CV graphs of clean and oxidized Ag surfaces were examined and it was determined that Ag oxide layers formed on the Ag surfaces in alkaline media had different catalytic effects on the oxidation of borohydride. The number of electrons transferred was found as 6 (5.55) after coulometric studies. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.