| 초록 |
To facilitate further commercialization of proton exchange membrane fuel cell, decomposition of the polymer electrolyte membrane needs to be solved. Functional sulfonic acid group grafted onto PAES by sulfide linkages to prevent degradation of functional groups was synthesized. Moreover, CeO2 nanoparticles were prepared with a size of 5–7 nm for its radical scavenging ability. The durable layer-by-layer (L-b-L) membrane of 100 μm thickness containing CeO2 spheres on both surface layers was fabricated by the spray method. The proton conductivity and electrochemical impedance spectroscopy revealed that the CeO2 nanoparticle size lower than 5–10 nm would not affect the proton conductivity of the L-b-L membrane. During the OCV test, the voltage loss rate of the SPAES140-4CeO2 membrane (0.21 mV h−1) was 5-fold lower than that of the recast Nafion membrane (1.035 mV h−1). The polarization curves after 100 h of OCV degradation test demonstrate that the maximum power density of the SPAES140-4CeO2 membrane dropped from 363.67 to 295.43 mW cm−2, while that of the pristine SPAES140 membrane significantly decreased from 378.59 to 230.48 mW cm−2. |
