Cell voltage transients of a gas-fed direct methanol fuel cell
| Autor: | Rittmar von Helmolt, Josef Kallo, Werner Lehnert, Jim Kamara |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Analytical chemistry Energy Engineering and Power Technology Direct-ethanol fuel cell Cathode Catalysis law.invention Anode chemistry.chemical_compound Direct methanol fuel cell chemistry law Dehydrogenation Methanol Electrical and Electronic Engineering Physical and Theoretical Chemistry Current (fluid) |
| Zdroj: | Journal of Power Sources. 127:181-186 |
| ISSN: | 0378-7753 |
| Popis: | The cell voltage behavior of a direct methanol fuel cell (DMFC) was investigated in response to the dynamic change of the cell current (current steps with rise/decay time=1 ms). The cell voltage was measured on a complete cell under regular fuel cell working conditions. To minimize the methanol cross-over from the anode to the cathode and its influence on the dynamic cell behavior, the anode feed of the DMFC was kept gaseous. The cell voltage transient permits a differentiation of three influencing effects on the cell dynamic: (1) the double layer capacity and the charge transfer resistance of the anode and the cathode, (2) the CH 3 OH dehydrogenation products poisoning of and its removal from the anode catalyst surface and (3) the impact of the remaining methanol cross-over. Contrary to the first two effects, which take place in the time range of 50 ms to 1 s, the methanol cross-over influences the cell voltage for approximately 10 s after the current changes. |
| Databáze: | OpenAIRE |
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