The Application of a Novel Catalytic Membrane in Direct Methanol Fuel Cell
| Autor: | Lian-Ming Lyu, 呂煉明 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 Direct methanol fuel cells (DMFC) are typically very simple and efficient devices among the other renewable energy sources. In DMFC, methanol fuel is directly fed into the cell without any other pre-chemical treatment process. The crossover of the reactant from one electrode to another is undesirable, as it reduces the reactant’s utilization efficiency and degrades the performance of the fuel cell. Since Nafion® membrane has high methanol permeability in DMFC, the development of new protocols to control the permeability is a challenging problem in this area. Recently, our group developed a stable and recyclable Nafion polymer anchored metal oxides for organic reactions. Lead ruthenate pyrochlore (Py, Pb2Ru2O6O’) modified Nafion® membrane (|NPy|) was used for these reactions. The modified membrane was prepared by in-situ precipitation method using Ru3+ and Pb2+ ions in the presence of molecular O2 under alkaline condition at 53℃. The catalytic activity of this catalyst was first confirmed by electrochemical method using a lead ruthenate pyrochlore modified electrode for the oxidation of methanol. It showed a well defined oxidation peak in CV clearly indicating its catalytic behavior towards the methanol oxidation. The control of methanol crossover by using the lead ruthenate pyrochlore modified Nafion® membrane was conducted directly in the DMFC. The modified Nafion® membrane showed good response compared to that of a unmodified Nafion® membrane. In sum, the gradient lead ruthenate pyrochlore modified membrane has been proved as a efficient catalyst for controlling the methanol crossover in DMFC. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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