study on bifunctional membrane electrode assembly of unitized regenerative

• Main Authors: Shing-chin Huang, 黃興秦
• Other Authors: Chien-liang Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/29838441187886308826

碩士 === 明道大學 === 材料科學與工程學系碩士班 === 97 === Unitized Regenerative Fuel Cell is capable of operating both as a fuel cell and as water electrolysis. In Unitized Regenerative fuel cell oxidant agent O2 and fuel agent H2 can be regenerated through water electrolysis process, so it can provides two functions as a storage and a power provider. Unitized Regenerative Fuel cell has the deftness in electrocatalytic behavior and stability of oxygen duel effective electrode. Both of these deftness will restrict the Unitized Regenerative Fuel cell application. In this research, improvement of the above behavior has been studied. Comparation of the different technology of Unitized Regenerative Fuel cell bifunctional MEA process has been studied. This study includes the reference group, application of the catalyst layer to the Gas diffusion layer, transfer method and application of the catalyst layer to the membrane to test fuel cell and water electrolysis mode in a variety of process under different temperature, humidity’s efficiency, and hydrogen production rate. Results show that transfer method has the best efficiency in all tests. Rising the temperature of the catalyst can promote the electrochemical reaction and the reaction rate according to the activation energy barrier effect. Therefore rising temperature can enhance the efficiency of fuel cell and water electrolysis. After adding the hydrophilic Conductive polymer into the catalyst in transfer printing method process. the efficiency of cell and water electrolysis can also be enhanced. The water vapor has also been used in replace of water in electrolysis test. In water electrolysis test, hydrophilic effect in surface will affect the water electrolysis efficiency. The results shows that hydrophilic surface MEA has better water electrolysis efficiency. The experimental results confirm that adding conducting polymers can raise the efficiency by 25％ on water electrolysis mode, That fuel cell performance decreased slightly by 5％, The hydrophilic behavior at the conductive polymer can account for both the increase efficiency of water electrolysis and decreasing effect of fuel cell function. When the steam is used, at the temperature 90℃, the deionized water fuel and steam fuel are almost the same in the amount of hydrogen production. If the battery temperature is raised up to 100℃, the performance of hydrogen production is 25％ betten than that in temperature of 90℃. When steam is used as anode fuel, the temperature at 100℃ becomes the best for operating. At cell temperature 100℃, by the efficiency of the electrolysis and H2 production rate will increase about 18％.