How is the anode defined from a chemical and Technical perspective?
Chemical definition:
At anode the oxidation reation takes place
Electrons pass during oxidation reaction
Load with excess of eletrcons -> neg. charge
Technical definition:
Positive Pole pole is anode
-> Cathode is neg. pole
Describe the effects of the various electrolytes in terms of detailed electrochemical reaction and water production. Name fuell cells which uses this type of elektrolytes.
What is the difference between the fuel cell and the elextrolyzer when considering the oxygen ion conductor?
Electrolyzer:
oxygen side = anode
Fuel cell:
oxygen side = catode
What is the enthalpy?
Sum of the systems internal energy plus the product of its pressure and volume.
= total enery avaible for the reaction
On which factor it depends if the lower or the higher heating value has to be taken into account?
It depends on whether the water produced is assumed to be gaseous or liquid.
Name the formula to calculate the cell efficiency.
What is the thermoneutral potential?
What is the standard potential?
Give the formula for the enthalpy of reaction
Give the formula for the Associted Voltage
How high is the efficiency of the fuel cell reaction with gaseous/liqiud water?
Describe the chemical potential
Describe the activity (a)
What is true about the chemical potential during and after a reaction?
The driving force of a chem. reaction is the chemical potential.
The sum of the chemical potentials in voluntary reactions must be subsequently be smaller than before.
The free enthalpy is the driving force
Give the formula for the free enthalpie
Give the formula for the ideal gas law
What is the cell voltage in Fuel Cells (approximately)?
Zuletzt geändertvor einem Jahr
