Abstract
In the present study, various mesoporous TixW1-xO2 (x = 0.5; 0.6; 0.7; 0.8) supports were fabricated via a facile solvothermal approach and explored the effect of doping tungsten concentration on electrochemical properties of TixW1-xO2-supported Pt electrocatalysts toward ethanol electrochemical reaction. Interestingly, the incorporation of tungsten into TiO2 lattices with the doping tungsten amounts (20 and 30 at %) resulted in boosting both the surface area and electrical conductivity, however, a reverse trend was observed when increasing the doped tungsten content more than 40 at %. Additionally, the relatively well-distributed Pt nanoparticles with the small particle size (ca. 3 nm) anchored on supports were achieved using a microwave-assisted polyol route. Electrochemical results indicated that various TixW1-xO2-supported Pt catalysts exhibited the catalytic performance greater than that of the commercial carbon-supported Pt (E-TEK) catalyst for ethanol electro-oxidation reaction (EOR). For as-obtained electrocatalysts, the Ti0.7W0.3O2-supported Pt catalyst showed the highest mass activity (~260.23 mA/mgPt) and greatest If/Ib ratio (~1.34), which ~2.0-fold and ~1.57-time higher than that of carbon-supported Pt (E-TEK) catalyst (~130.62 mA/mgPt for mass activity and ~0.85 for If/Ib ratio, respectively). After 5000 cycling tests, the mass activity loss of TixW1-xO2-supported Pt catalysts was around twice lower than that of the commercial Pt/C (E-TEK) catalysts, suggesting that the TixW1-xO2-supported Pt catalysts exhibited the superior stability toward ethanol electrochemical oxidation. The outstanding electrochemical activity and stability of TixW1-xO2-supported Pt electrocatalysts were owing to the synergetic effect between Pt nanocatalyst and non-carbon TixW1-xO2 supports as well as superior natural durability of TiO2-based materials.
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