| 초록 |
A proton exchange membrane fuel cell (PEMFC) is highly efficient and clean energy-conversion device. In the PEMFC, the additives in catalyst layer (CL) affect the performance over a wide range of relative humidity (RH). In addition, the CL morphology influences performance. However, the key properties which impact the CL morphology and cell polarization under low RH are inadequately investigated. In this study, the effect of addition of SiO2 in the CLs, whose structures were controlled by different solvents, on the CL structure and performance was investigated. Glycerol and N-methyl-2-pyrrolidinone were chosen as solvents to control the CL morphology. The CL structure and water uptake were explored. Furthermore, electrochemical performances, such as direct-current polarization and electrochemical impedance spectra, were evaluated. As a results, the cell polarizations under wide range of RH were influenced by not only the addition of SiO2 but also the CL morphology. |
