Doping to Modify Silicon Dioxide Water-absorbing Thin-Film Electrodes for Self-humidifying Proton Exchange Membrane Fuel Cells

• Main Authors: Lai, Kuo-Pin, 賴國斌
• Other Authors: Lin, Chien-Liang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/10125632196888053706

碩士 === 明道大學 === 材料科學與工程學系碩士班 === 100 === This study used hydrophilic SiO2 doped Fe, Ag, and Zn preparation ink individually with a Pt/C catalyst, and used the transfer method composed of an anode catalyst layer in the proton exchange membrane, to SiO2-Fe and SiO2-Ag and SiO2-Zn in the anode catalyst layer of the membrane electrode assembly, improve the proton exchange membrane fuel cell performance (PEMFC) in low humidity or without humidification. The PEMFC carries on electrochemistry reaction time, the proton exchange membrane moisture content has a tremendous influence to the proton transmission, but to maintain the thin-film high moisture content, the through the external humidifier humidifying the reaction gas into the fuel cell internal. Self-humidifying PEMFC may use the fuel cell respond directly produces water, and does not require extra exterior humidification. The experiment SiO2-Fe with different loadings, SiO2-Ag and SiO2-Zn with different sintering temperature were attached to the proton exchange membrane, the anode catalyst layer, the cathode gas diffusion electrodes, the catalyst-containing layer, test conditions to change the cell and gas humidification temperature, respectively, discussing different SiO2-Fe, SiO2-Ag, and SiO2-Zn with different sintering temperature on fuel cell performance. The fuel cell performance results showed that when the sintering temperature was 500°C the SiO2- Ag was 50:1, the cell temperature was 50°C, the conditions in 70°C humidification temperatures, SiO2-Ag better than other SiO2-Fe, and SiO2-Zn, the current density is 400 mA/cm2, and in the sintering temperature of 1000°C, SiO2-Ag 50:1 has best performance, current density is 579 mA/cm2.