Experimental Study of the Effect of Flow Variables and Screw Torque on the Performance of DMFC
Date Issued
2004
Date
2004
Author(s)
Hou, Jen-You
DOI
zh-TW
Abstract
直接甲醇燃料電池（DMFC）以甲醇水和氧氣作為反應物，因使用方便，而且沒有氫氣爆炸的危險，適合個人隨身電子產品，未來應用潛力無窮，近年來相關研究蓬勃發展。
本實驗為提升DMFC性能，以流動變數與螺栓扭矩作為操作變數，來觀察DMFC電壓-電流關係曲線，並且紀錄極限電流。其中，流動變數包含甲醇水與氧氣的濃度、流量、壓力，而螺栓扭矩代表的是電池組的密合壓力，也就是MEA和石墨流道板之間的接觸壓力。本實驗亦探討各變數之間對DMFC影響的原因，及它們之間存在的關係。
實驗結果顯示，陽極端甲醇水濃度與流量對DMFC的影響，只有在氧氣濃度降低時顯現，影響效果較小。而陰極氧氣濃度與流量對DMFC有直接影響，氧氣濃度提升使得DMFC性能提升，影響效果較大。單向對陰極加壓有可能使接觸電阻增加，而使DMFC性能變得很差。螺栓扭矩（密合壓力）加大DMFC性能影響亦大，但扭矩大小有其限制。
Direct Methanol Fuel Cell (DMFC) working based on the reactants of methanol liquid and oxygen. It provide an advantage of convenience of use and no danger of a hydrogen explosion and has extended itself as a part of the portable electronic products for individuals. Its largely potential application in the future has made it very popular in research and development in recent years.
The main purpose of this experiment is to raise the performance of DMFC through change the factors of flow variables and screw torque from observation of the voltage-current curve varying and recording of the limiting current. Flow variables cover concentration, volume flow rate, and pressure of methanol liquid and oxygen, and screw torque indicates the tightness pressure of fuel cell stack that is the contact pressure between MEA and graphite channel board. This experimental study is also to explore the influence of different variables on DMFC and the relationship between them.
The outcome of experiment shows that the concentration and volume flow rate of anodic methanol liquid will have an effect on DMFC only at the time while the concentration of oxygen is declining, but the concentration and volume flow rate of cathode oxygen will have a direct and large effect on DMFC. It will raise the performance of DMFC through an increase of concentration of oxygen. An unidirectional increase of pressure to cathode oxygen will make the performance of DMFC become weak because the contact resistance will possibly become large. And the soaring but limited screw torque (tightness pressure) has a great influence on the performance of DMFC.
Subjects
燃料電池
甲醇
直接甲醇
質子交換膜
扭矩
Direct Methanol Fuel Cell
DMFC
MEA
Torque
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-93-R91522110-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):f52e3411dfebcbff32d40858621cda81