Abstract
A facile method was developed to fabricate fibrous membranes of niobium-doped titania-supported platinum catalysts (Pt@Nb-TiO2) by a two-step approach. The process started with generating niobium-doped titania (Nb-TiO2) fibrous membranes by electrospinning, followed by the deposition of Pt nanoparticles (NPs) using an atomic layer deposition (ALD) technique. The area-specific oxygen reduction reaction (ORR) activity of Pt@TiO2 catalyst membrane was increased by ∼20 folds if 10 at.% of Nb was incorporated into the ceramic fibers. The area-specific activity also increased with the number of ALD cycles, because of the increase of the Pt loading in the catalysts. After post-treatment of the catalyst membrane at high temperature in H2-containing atmosphere, the ORR activity became 0.28 mA/cm2Pt at 0.9 V (vs RHE), because of the improvement in conductivity of Nb-TiO2 fibers and better crystalinity of Pt NPs. The results of accelerated-stability test showed that the Pt@Nb-TiO2 catalyst membrane was highly stable...
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