In this communication, we recognize the electrochemical capacitance behavior of SnO (tin(II) oxide) nanoparticles in aqueous solutions. TEM image shows the SnO nanoparticles synthesized via hydrothermal method to be in the nano scale range. The nanomaterial was immobilized on paraffin-impregnated graphite electrode to preserve the high surface area of SnO nanoparticles which plays a crucial role in preserving the electrochemical activity. In 0.1 M NaCl solutions, nano SnO provided a high cell voltage of 1.65 V vs Ag/AgCl and the nanomaterial was chemically and electrochemically stable over 1000 cycles of potentiodynamic and charge-discharge measurements.