Improvement of multilayer applying method for catalyst layer of PEFC using inkjet coating printer

Polymer Electrolyte Fuel Cells are expected to be widly used as clean energy source. A doctor blade method, generally manufacturing method of PEFC, it has problems such as a bad dispersibility of Pt catalyst and a difficult thickness control in precisely. Our laboratory proposes applying an inkjet coating printing to the CL manufacturing process to solve these problems. The cell performance of CL composed of a multilayer to obtain enough thickness was lower than that of single layer. The reason was to have obstructed the electron transport property by separating ionomer and Pt in the catalyst ink. The cell performance has been enhanced by the formation of the CL where I/C ratio was changed from GDL to the direction of the membrane.