CONDUCTIVITY AND ELECTROCHEMICAL ORR MASS TRANSPORT PROPERTIES OF NOVEL SOLID POLYMER ELECTROLYTES

摘要

In order to assess the applicability of proton exchange membranes in fuel cells,it is necessary to undertake fundamental studies on different solid polymer electrolytes.Research on the conductivity of different proton exchange membranes has shown that proton conductivity is correlated to the membrane's water content,ratio of water molecules to ionic sites (X),and the overall proton concentration.These factors are determined by the composition and chemical structure of the membrane.In addition to Ohmic losses caused by membrane resistance,fuel cell performance is also dependent on the electrochemical kinetics and oxygen mass transport properties at the electrode|membrane interface.As a result,ORR kinetics in several polymer electrolyte membranes has been actively studied using microelectrode techniques under conditions that mimic the environment of PEM fuel cells.