Ethanol eller methanol i mikrobrændselsceller?

Jonas Hagel Thorn & Thomas Balle

Studenteropgave: Semesterprojekt

Abstrakt

The project is based on examining of methanol and ethanol's ability to oxidize using cyclic voltammetry (CV). The project is made in association to a micro-fuel , which is meant to be used in a hearing aid currently under development at the Danish Technological Institute (DTI). The fuel cell is constructed according to the principle behind a „Direct Methanol Fuel Cell‟ (DMFC) that works by oxidizing or reducing methanol and oxygen. Since the limiting factors of the fuel cell are space and heat, there are high demands to the efficiency of the fuel. By separating the anode from the cathode with a 'Proton Exchange Membrane' (PEM) a potential is being produced between the anode and cathode which can be used to operate an electrical circuit. Using CV, we have been studying whether ethanol can work as a substitute for the methanol in the process. From the reaction, it appears there are 12 electrons obtained for each molecule of ethanol compared with 6 electrons for each molecule of methanol. It may therefore indicate that ethanol would be a better fuel. We have been studying this experimentally, and our results have shown the effect of methanol to be 47 mW/cm2 and the corresponding value for ethanol to be 2,4 mW/cm2. It can be concluded that ethanol can't replace methanol because the effect is 20 times lower.

UddannelserKemi, (Bachelor/kandidatuddannelse) Bachelor el. kandidat
SprogDansk
Udgivelsesdato28 jan. 2011
VejledereJohn Mortensen

Emneord

  • mikrobrændselscelle
  • cyklisk voltammetri