Seite - 71 - in Advanced Chemical Kinetics
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Ethanol is inserted into the fuel cell, adsorbs at electrode surface and is oxidizedas shown in
Figure8.
CH3CH2OH!CO2þH2O (13)
Whileoxygen fromair is reduced:
O2 gð
ÞþHþ aq þe�!H2O lð
Þ (14)
Which gives the overall reaction of the direct ethanol fuel cell (admitting complete ethanol
oxidationreaction):
CH3CH2OH
lð ÞþO2 gð
Þ!H2O lð
ÞþCO2 gð
Þþenergy (15)
With the energy beingmostly electricalwork andheat. The electricwork is dependent on the
potentialdifferencebetweencathodeandanode:thelargerthedifference,thebiggertheelectrical
work. Redox kinetics, thus, influences this amount of energy conversions, by inducing the
numberofelectronsthatare injectedintotheelectrical circuit, resulting inelectricalcurrent.
At the anode, the ethanol adsorbs on electrode and the oxidation is characterized by the
dehydrogenation. Some studieswith Fourier transformed infra-red (FTIR) in situ [32], differ-
ential electrochemicalmass spectroscopy (DEMS) [33, 34] show that themainproducts from
electrochemicalethanoloxidationreaction,onPt-basedcatalysts,areaceticacidandformalde-
hyde [35]. The electricwork produced by direct ethanol fuel cell depends on the number of
electrons that circulateat electrical circuit and thenumberof electronsgeneratedby the redox
reaction.Thus, thekineticof ethanoloxidationreaction limits fuel cellperformance.
Figure8. Schemeofdirect ethanol fuel cell.
New Materials to Solve Energy Issues through Photochemical and Photophysical Processes: The Kinetics Involved
http://dx.doi.org/10.5772/intechopen.70467 71
zurück zum
Buch Advanced Chemical Kinetics"
Advanced Chemical Kinetics
- Titel
- Advanced Chemical Kinetics
- Autor
- Muhammad Akhyar Farrukh
- Herausgeber
- InTech
- Ort
- Rijeka
- Datum
- 2018
- Sprache
- englisch
- Lizenz
- CC BY 4.0
- ISBN
- 978-953-51-3816-7
- Abmessungen
- 18.0 x 26.0 cm
- Seiten
- 226
- Schlagwörter
- Engineering and Technology, Chemistry, Physical Chemistry, Chemical Kinetics
- Kategorien
- Naturwissenschaften Chemie