| Summary: | The proton exchange membrane (PEM) represents a pivotal material and a key challenge in developing fuel cell science and hydrogen technology. Nafion is the most promising polymer which will lead to its commercialisation. Hybrid membranes of nanosized tungsten oxide (WO<sub>3</sub>) and Nafion were fabricated, characterised, and tested in a single cell. The incorporation of 10 wt% WO<sub>3</sub> resulted in 21% higher water uptake, 11.7% lower swelling ratio, almost doubling the hydration degree, and 13% higher mechanical stability of the hybrid membrane compared to the Nafion XL. Compared to commercial Nafion XL, the rNF–WO-10 hybrid membrane showed an 8.8% and 20% increase in current density of the cell at 0.4 V operating at 80 and 95 °C with 1.89 and 2.29 A/cm<sup>2</sup>, respectively. The maximum power density has increased by 9% (0.76 W/cm<sup>2</sup>) and 19.9% (0.922 W/cm<sup>2</sup>) when operating at the same temperatures compared to the commercial Nafion XL membrane. Generally, considering the particular structure of Nafion XL, our Nafion-based membrane with 10 wt% WO<sub>3</sub> (rNF–WO-10) is a suitable PEM with a comparable performance at different operating conditions.
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