Fuel Cell Cathode Composite Catalyst -- Pyrochlore Tungsten Trioxide
The study found that adding the transition metal oxide into the precious metals will help improve the electrocatalytic activity. Tungsten oxide can form the synergistic catalytic effect with the noble metal platinum, and perform quite stable in an acidic environment, the composite catalyst uses tungsten trioxide as the carrier has been extensively studied. Pyrochlore tungsten trioxide has a layered structure of multi-dimensional channel, also has a three-dimensional channel, and this structure is conducive to rapid migration and ion exchange to improve the ionic conductivity; at the same time, it enhances its adsorption property, certain amount of ions embedded in the layered structure to form intercalation compound catalytic material. Synthesis of pyrochlore tungsten trioxide by hydrothermal synthesis method, take pyrochlore tungsten trioxide and carbon as the carrier to prepare Pt / WO3-C composite catalyst which is the proton exchange film of fuel cell catalytic material.