The study of Xe adsorption behavior in meso-size pores of carbon black materials using laser-polarized 129Xe NMR spectroscopy

The meso size pores of carbon black materials with Pt critically affect catalysts which play an important role for fuel cells of electric vehicles. Time-consuming BET methods are usually used to measure the physisorption enthalpy which determines the characteristics of catalysts. The laser polarized method enhances Xe-129 polarization by 4 orders of magnitude, overcoming a low sensitivity, making this measurement technique faster than conventional experiments. In this paper, we first demonstrate Laser-Polarized Xe-129 NMR Spectroscopy for studying carbon black materials with Pt of fuel cells of electric vehicles in order to determine the physisorption enthalpy. At the same time, T-1 experiments using Laser-Polarized Xe-129 will be discussed in order to clarify the surface condition and adsorption behavior. (C) 2003 Elsevier Inc. All rights reserved.