| 초록 |
In proton exchange membrane fuel cells (PEMFC), three-phase interfaces between nafion membrane, carbon electrode and Pt catalysts has generally shown poor interfacial contact, causing significant concerns of interfacial resistance and efficiency loss. In this study, in order to challenge this problem, we deposit polyelectrolyte multilayers that consists of poly(diallyldimethyl ammonium chloride) (PDAC) and sulfonated poly(1,2-dimethyl-1,4-phenylene oxide)(sPPO) on the nafion membrane surface using layer-by-layer (LbL) assembling method. Since the PDAC/sPPO polyelectrolyte multilayer is highly ion-conductive and freely deformable to the applied pressure in a membrane assembly step, it can create a stabilized coating layer around Pt catalysts and provide an ideal condition for three-phase interfaces. As a result, we confirm that the PEMFC efficiency can be maximized at optimal thickness value of PDAC/sPPO polyelectrolyte multilayer. |
