Unraveling the Improved ORR Activities in Pt/TiO2/C Hybrids: The Role of Pt Morphology and Reactive Surface Species

• DOI: 10.26434/chemrxiv.7261016.v1
• Publication Date: 2018-10-29T16:02:00Z
• Authors: Eduardo C. M. Bar...; Luanna S. Parreira; Isabel C. de Freitas; Luci R. Aveiro; Daniela C. de Oli...; Mauro C. dos Santos; Pedro H. C. Camargo
• Keywords: Nanomaterials; Carbon fibers; Platinum nanoparticles

Further improvements and mechanistic understanding of the electrocatalytic enhancements towards oxygen reduction reaction (ORR) are required to meet cost/energy demands thus enable their practical applications in polymer electrolyte fuel cells. An investigation enhancement mechanisms stability controlled electrocatalysts comprised Pt nanoparticles supported on TiO2/C materials was herein performed. The catalysts were prepared by depositing Pt, over surface TiO2 colloidal spheres. These then onto Vulcan carbon produce Pt/TiO2/C. effect coverage at as well Pt/TiO2 loading ORR activity investigated. Results indicate that control played a pivotal role optimization, which an association between content established. superior compared commercial Pt/C (E-TEK). Variations catalytic could be correlated with morphological features concentration reactive groups. described suggest mechanism together synthesis Pt-based nanomaterials may lead tailored properties activities.