The spark plasma sintering (SPS) technique was successfully used to mold a hydrous amorphous RuO2 electrode Without any additives and binders. At the cyclic voltammetry (CV) scan rate of 1 mVs(-1), the electrochemical capacitances of the RuO2 electrodes are 600-700 Fg(-1) for the entire electrode. An increase in the SPS current during the compaction led to the crystallization and dehydration of RuO2. which in turn, resulted in a significant decrease in its capacitance. There is room to improve the rate properties as we observed a steep drop in the capacitance when the CV scan rate was raised. (C) 2009 Elsevier B.V. All rights reserved.