Fabrication of microstructure controlled cathode catalyst layers and their effect on water management in polymer electrolyte fuel cells

Publication year: 2011
Source: Electrochimica Acta, In Press, Accepted Manuscript, Available online 13 June 2011

Sung-Dae, Yim , Young-Jun, Sohn , Seok-Hee, Park , Young-Gi, Yoon , Gu-Gon, Park , …

Although cathode catalyst layers (CCLs) are at the center of water management in polymer electrolyte fuel cells (PEFCs), the understanding of water movement in CCLs and their roll on fuel cell performance is still limited. In this present study, several CCLs with controlled microstructure, including main pore size, pore volume and porosity ranging from 30–70nm, 0.443–0.962cm3/g Pt/C, and 45.4–64.4%, respectively, were prepared by changing the hot-pressing pressure in a decal process, and their water management ability and cell performance were evaluated. The electrochemical analyses reveal that, as the pore size and pore volume of CCLs increase, the diffusion resistance mainly…