Novel IrO2/Ti1-xWxO2 electrocatalysts for the oxygen evolution reaction (OER) in a solid polymer electrolyte (SPE) water electrolyzer were synthesized using the Adams fusion method and the evaporation-induced self assembly method. Physical and chemical characterizations of the sample-including Brunauer-Emmett-Teller (BET) surface area analysis, X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, cyclic voltanunetry, electrochemical impedance spectroscopy, and polarization curves for single cells-were performed. The W-doped TiO2 support with various doping amounts (0, 5, 10, and 20 at.%) exhibited a single-phase anatase structure and a large BET surface area. Furthermore, with annealing at a reducing atmosphere, a phase change from anatase to rutile occurred, trace alpha-W was precipitated from the crystal lattice of the Ti0.8W0.2O2 sample, and the BET surface area decreased accordingly. On the other hand, the conductivities of the W-doped support exhibited an increasing trend, indicating a significant impact of the W dopant on the enhancement of the TiO2 conductivity. The voltammetric charge of 40IrO(2)/Ti0.9W0.1O2 (1754 mC (cm(2) mg)(-1)) was higher than that of unsupported IrO2, and 40IrO(2)/Ti0.9W0.1O2 exhibited enhanced electrochemical activity for the OER process. A single-cell performance of 1.79 V was achieved by using 80IrO(2)/Ti0.9W0.1O2 as an anode for the minimum charge-transfer resistance and ohmic resistance. Electrocatalysts with the Ti0.9W0.1O2 support exhibited good durability. Thus, Ti0.9W0.1O2 is a promising anode electrocatalyst support for SPE water electrolysis.