在燃料電池，奈米觸媒粒子聚集、成長及流失等現象是造成燃料電池性能劣化的主要因素。在Pt/Ru雙合金電極上亦呈現Ru以離子形式流失並且發生cross-over至陰極的現象。因此觸媒的耐久度是固定式或移動式電源技術的主要瓶頸。由元素分析和質譜儀對於半透膜之SO32-及F流失的現象和Ru的cross-over的行為作定時的量測以確定可以改進的方案。電極化學所產生的Peroxy Radical, H2O2 等成為電極和半透膜的首號殺手。該成分造成半透膜及黏著劑材料的分解並造成電極和半透膜之間的結合喪失導致界面電阻增加，使電極性能劣化。將Nafion或非氟化系統的半透膜劣化的機制詳細掌握必能開發可防止材料劣化、提升壽命的解決方案。本研究中將使用核磁共振微成像顯影(μ-MRI)，對工作中及工作前、後之燃料電池作空間組成、化學組成、孔隙分佈等改變作原位監控以瞭解電池劣化的成因。本實驗室在NMR領域已有多年研究基礎與經驗有能力開發在核磁共振微成像顯影相關技術，此一關鍵技術本實驗室仍在持續研究發展中於國際上處於領先地位，深信在不久將來將有重大突破。此外單電池電化學(ECS,CV，AC-Impedance)之分析方法可望協助相關劣化的機制資訊進而提供解決方案。 ; Durability is one of the most important issues in direct methanol fuel cell (DMFC) commercialization. The influences of the fuel cell durability are degradation of catalysts and membrane are catalyst poison, size change and dissolution and sulfonic group and F- dissolution. This project is focus on the degradation mechanism to arise fuel cell life time. Peroxy Radical and H2O2 from electrode reaction will decompose binder and membrane to increase the interface resistance between electrode and membrane. To understand the decompose mechanism of Nafion and non-fluorine system membrane will develop to protect material degradation ability. The in-situ detection the Ru, SO32- and F- was by element analysis (EA) and mass spectrometers to make sure the improvement method. The magnetic resonance imaging technique is powerful to in-situ monitor the variation of component of space and chemical and porous distribution. The single cell electrochemistry analysis including the cyclic voltammorgrams (CV) and AC-Impedance also provides the information of degradation mechanism to improve fuel cell commercialization. ; 研究期間 9701 ~ 9712
