Passively operated vapor-fed direct methanol fuel cells for portable applications
| Autor: | Carsten Agert, Kevin D. Beard, Steffen Eccarius, Falko Krause |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Stromdichte
Kathode Renewable Energy Sustainability and the Environment elektrochemische Elektrode Evaporation Analytical chemistry Energy Engineering and Power Technology transportables Gerät Wasserwirtschaft Cathode Anode law.invention chemistry.chemical_compound Direct methanol fuel cell chemistry law Mass transfer Reversible hydrogen electrode Wärmeverlust Methanol Electrical and Electronic Engineering Physical and Theoretical Chemistry Methanol fuel |
| Popis: | The impact of structural parameters and operating conditions has not been researched yet for vapor-fed operation of a DMFC at near-ambient conditions. Thus, a detailed parameter study that included reference cell measurements to assess anode and cathode losses separately was performed. Among other parameters like temperature or air stoichiometry, different opening ratios that controlled evaporation of methanol into the vapor chamber were examined. Water management was found to be a critical parameter for a vapor-fed DMFC. Depletion of water inside the anode catalyst layer, especially at higher current densities, decreased performance of the fuel cell substantially. Back diffusion of water from the cathode to the anode was examined. A micro-structured cathode electrode that increased water back diffusion due to a reduced mass transfer resistance was developed and investigated. Finally, efficiencies and heat losses of a vapor-fed DMFC were determined. |
| Databáze: | OpenAIRE |
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