Abstract
Titania supported platinum and iridium electrocatalysts (Pt/TiO2 and Ir/TiO2) were synthesized and investigated as bifunctional oxygen electrode (BOE) catalysts for unitized regenerative fuel cells (URFCs). TEM images revealed uniform distribution of Pt and Ir nanoparticles on the TiO2 support. Histogram analysis showed particle sizes of Pt and Ir to be 4.5 and 2.0 nm, respectively, which was also confirmed by the XRD characterization. Among the various Pt-Ir compositions prepared, Pt85Ir15 (with a Pt/Ir weight ratio of 85/15) showed the highest catalyst efficiency towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The URFC testing results showed that the round-trip energy conversion efficiency (εRT) of supported Pt-Ir/TiO2 (42%) was significantly higher than that of unsupported PtIr black (30%). The TiO2 support provided high surface area for uniform dispersion of the catalyst particles. The URFC performance increase was ascribed to the uniform dispersion and better utilization of noble metal catalysts.
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