MSE Seminar Series: YuYe J. Tong
Friday, April 30, 2010
Room 2108 Chemical and Nuclear Engineering Bldg.
An Investigation of Electrocatalytic Activity of Ru@Pt and Au@Pt Nanoparticles as Functions of Surface Composition and Core Size
Presented by YuYe J. Tong
Department of Chemistry
Pt has long been used as a major component of both anode and cathode electrocatalysts for hydrogen or methanol (MeOH) electro-oxidation and oxygen reduction reaction (ORR) in low-temperature fuel cell applications. However, several major long outstanding obstacles still exist that prevent large scale practical application of the fuel cells. On the anode side, the CO poisoning during the hydrogen or MeOH electro-oxidation quickly lowers the catalytic activity of Pt. On the cathode side, the notoriously sluggish ORR is responsible for the large lost of the cell potential. Additionally, the high loading of Pt needed in both anode and cathode to sustain the performance noticeably increases the cost of the whole fuel cell system. Numerous efforts have been made to improve the CO tolerance, to reduce Pt loading, and to accelerate kinetically the ORR over the last decades. Within this broad context, Iʼll discuss In this talk some of the recent work in my lab using metal corePt shell, particularly Ru@Pt and Au@Pt, nanoparticles as reliable model systems for mechanistic investigations (utilizing in situ electrochemical NMR and surface enhanced IR) on how the electrocatalytic activity of bimetallic electrocatalysts can be optimized by varying surface composition and (Au) core size.