A Pt-H2WO4 based electrocatalyst has been fabricated by an inexpensive chemical route for use as an oxygen cathode in 99% phosphoric acid at 180-degrees-C. The effect of %Pt (w/w) and %H2WO4 (w/w) on the Pt-H2WO4 electrode performance was studied. The electrocatalytic properties for the oxygen reduction reaction, e.g., exchange current density, mass activity, and specific activity of a 2% Pt-H2WO4 based electrode was several times higher than those of 10% Pt. The performance of the 2% Pt-1%H2WO4 was not due to an increase of its electrochemically active surface area. This may be due to electronic interaction and synergetic effects between electrocatalyst and support and its chemical composition.