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Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

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BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 14, Problem 18E
Textbook Problem
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Use chemical equations to explain how the molten carbonate fuel cell (MCFC) works. What are its advantages and its disadvantages?

Interpretation Introduction

Interpretation:

The working of the molten carbonate fuel cell (MCFC) with the help of chemical equation is to be explained and its advantages and disadvantages are to be discussed.

Concept introduction:

Molten-carbonate fuel cells (MCFCs) are high-temperature fuel cells, which are operated at higher temperatures of 600°C and above.

Oxidation is the addition of an electronegative element or the removal of an electropositive element in a chemical reaction.

Reduction is the addition of an electropositive element or the removal of an electronegative element in a chemical reaction.

Electrolysis is the process in which a reaction takes place at electrodes. The positively charged electrode is called anode. The negatively charged electrode is called cathode. During electrolysis, reduction takes place at the cathode and oxidation takes place at the anode.

The hydrogen-oxygen fuel cell is a device that generates electricity through the chemical reaction between a source fuel and an oxidant.

Explanation of Solution

The molten carbonate fuel cell (MCFC) uses carbonate salts of alkali metals as electrolyte and it is operated at high temperatures 600C0 and over. The molten carbonate fuel cells use potassium carbonate as an electron transfer medium and methane is used as a fuel.

Methane gas is treated with water in order to form carbon dioxide and hydrogen gas, as follows.

CH4+2H2OCO2+4H2

O2 half-cell reaction will occur as reduction at the cathode. Oxygen gas is reduced in the presence of carbon dioxide to carbonate ion.

4CO2(g)+ 2O2(g)+8e4CO3(aq)

H2 half-cell reaction will occur as oxidation at the anode. Hydrogen gas is oxidized in the presence of carbonate ion to water.

4H2(g)+ 4CO3(l)4CO2(g)+8e+4H2O(

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Chapter 14 Solutions

Chemistry In Focus
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