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Questions and Answers
Which type of fuel cell operates at a higher temperature?
Which type of fuel cell operates at a higher temperature?
- Both operate at the same temperature
- Phosphoric acid fuel cell (correct)
- Alkaline fuel cell
- Temperature is not mentioned in the text
What is the electrolyte used in an alkaline fuel cell?
What is the electrolyte used in an alkaline fuel cell?
- Distilled water
- Concentrated phosphoric acid
- Dilute sulfuric acid
- Aqueous solution of KOH (correct)
Why can carbon containing fuels not be used in an alkaline fuel cell?
Why can carbon containing fuels not be used in an alkaline fuel cell?
- CO2 formed damages the catalyst
- CO2 formed clogs the fuel cell
- CO2 formed is toxic to the environment
- CO2 formed reacts with the electrolyte to reduce efficiency (correct)
What type of electro-catalyst is used in a phosphoric acid fuel cell?
What type of electro-catalyst is used in a phosphoric acid fuel cell?
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Study Notes
Fuel Cells Overview
- High-Temperature Fuel Cell: Solid Oxide Fuel Cells (SOFC) operate at higher temperatures, typically between 600°C to 1000°C.
- Electrolyte in Alkaline Fuel Cell: The electrolyte used is potassium hydroxide (KOH) solution, facilitating the electrochemical reaction.
- Carbon Fuels Limitation: Carbon-containing fuels cannot be used in alkaline fuel cells because they can lead to carbon dioxide poisoning, which disrupts the reaction process.
- Electro-catalyst in Phosphoric Acid Fuel Cell: Platinum or platinum-based alloys are commonly used as the electro-catalyst, enhancing the reaction rate and efficiency within the fuel cell.
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