Enhancement of Electrocatalytic Activity for Oxygen Reduction Reaction on TiO2-Supported Pt-Based Intermetallic Compound Catalysts

Tuesday, 7 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
T. Tanabe, T. Gunji, K. Sasaki, A. J. Jeevagan, T. Tsuda (Kanagawa University), S. Kaneko (Research Institute for Engineering, Kanagawa University), G. Saravanan (CSIR-National Environmental Engineering Research Institute (CSIR-NEERI)), H. Abe (National Institute for Materials Science (NIMS)), M. Tanaka (Department of Applied Chemistry, Tokyo Metropolitan University), and F. Matsumoto (Kanagawa University)
Stable and long-term electrocatalytic performance towards cathodic oxygen reduction reaction (ORR) was achieved by impregnation of Pt-based nanoparticles (NPs) on anatase titania (TiO2) support. For example, organometallic precursors PtCODCl2 and C10H14CuO4 and TiO2 or carbon black (CB) supports were co-reduced using lithium triethylborohydride to achieve intermetallic phase between Pt and Cu on TiO2(or CB) under ambient temperature. Finely dispersed PtCu NPs with an average particle size of 3 nm were achieved through wet-chemical synthetic route.

Potential cycle with PtCu/CB in 0.1 M HClO4 aqueous solution between 0.4-1.1 V (vs. RHE) accelerates ORR (Fig. 1) because of the formation of dealloyed surface of PtCu NPs caused by dissolution of Cu from the surface of PtCu NPs. The dealloyed PtCu/CB showed the highest electrocatalytic activity both in terms of onset potential as well as cathodic current density compared to Pt/CB as well as PtPb/CB and PtNi/CB towards ORR (Fig. 2). The onset potential of PtCu/TiO2 is shifted to higher electric potential by 180 mV compared to Pt/CB (Fig. 3).