Improvement of Electrochemical ORR Activity and Its Durability with Pt Electrocatalyst Nanoparticles Anchored on MOx/Cup-Stacked Carbon Nanotube in Acidic Aqueous Media

Tuesday, 30 May 2017
Grand Ballroom (Hilton New Orleans Riverside)
F. Ando, T. Tanabe, T. Gunji, S. Kaneko, T. Ohsaka, and F. Matsumoto (Kanagawa University)
In order to prepare the sample that exhibits the enhancement of oxygen reduction reaction (ORR) and improvement of its durability for the ORR in acidic aqueous solutions, Pt nanoparticles (NPs) were deposited on TiO2 moieties which was coated on a cup-stacked carbon nanotube (CSCNT) as a electron-conducting support material. The TiO2 moieties on which Pt NPs were deposited contribute to both enhancement of ORR and improvement of durability of ORR electrocatalytic activity by the electronic interaction between Pt NPs and TiO2 and anchor effect of rough TiO2 by which Pt NPs are anchored, resulting in the inhibition of aggregation of Pt NPs during potential cycling. The two functions of TiO2 moieties could realize large improvement of the electrocatalytic performance for ORR in Pt NPs/TiO2/CSCNT. The formation of nanostructure of Pt NPs on TiO2 and surface structure of the Pt NPs were characterized with transmission electron microscope (TEM). The electronic states of Pt and Ti atoms were measured with X-ray photoelectron spectroscopy (XPS). The results obtained with TEM and XPS supported our consideration on the improvement of ORR activity and its durability.