Study on the Effect of Manufacturing Processes of the Catalyst Layer on the Performance of High Temperature Proton Exchange Membrane Fuel Cells

• Main Authors: HSIEH,CHANG-YU, 謝長佑
• Other Authors: CHEN,YUNG-SUNG
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/275p5s

碩士 === 國立中正大學 === 機械工程系研究所 === 106 === High-temperature proton exchange membrane fuel cells (HT-PEMFCs) have the advantages of high reaction kinetics, simple configuration and easy water management when compared with low-temperature proton exchange membrane fuel cells. The performance of the membrane electrode assemblies of the HT-PEMFC is affected by many factors, including membrane type, catalyst loading, binder type, and permeability and porosity of the gas diffusion layers. This study focuses on the effect of manufacturing processes of the catalyst layer on the performance of a HT-PEMFC, including catalyst loading and binder type. In addition, a carbon layer is introduced between the membrane and the catalyst layer to improve the utilization of catalyst. The effect of the carbon layer on the performance of the HT-PEMFC is studied by electrochemical impedance spectroscopy. The experimental results show that a thicker carbon buffer layer increases the ohmic resistance, resulting in a lower performance of the HT-PEMFC. With the addition of dilute phosphoric acid in the carbon buffer layer, the performance of the HT-PEMFC is improved due to the improvement of proton conductivity. It is suggested that 0.1 mg cm−2 carbon buffer layer doped with 20% phosphoric acid provides the optimal performance in the study.