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Chapter 17: Q39E (page 961)

Why do batteries go dead, but fuel cells do not?

Short Answer

Expert verified

Fuel cells do not go dead because they use chemical energy to produce electrical energy.

Step by step solution

01

Batteries and Fuel cells:

  • A battery is a self-contained device that generates electricity, but a fuel cell is a galvanic cell that requires a continual external supply of one or more reactants to function.
  • The Leclanche dry cell is one form of battery that incorporates an electrolyte in an acidic water-based paste.
02

Find out why batteries die but gasoline does not:

  • Batteries are self-contained and have a finite amount of reagents to use before they die. Alternatively, by-products of the battery reaction accumulate and interfere with the process.
  • Fuel cells do not go dead because they use chemical energy to produce electrical energy and they do so as long as the fuel is available. So, given an unlimited source of fuel, a fuel cell will never go dead, unlike a battery.

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Most popular questions from this chapter

Given the following cell notations, determine the species oxidized, species reduced, and the oxidizing agent and reducing agent, without writing the balanced reactions

a. \({\rm{Mg}}(s)\left| {{\rm{M}}{{\rm{g}}^{2 + }}(aq) || {\rm{C}}{{\rm{u}}^{2 + }}(aq)} \right|{\rm{Cu}}(s)\)

b.\({\rm{Ni}}(s)\left| {{\rm{N}}{{\rm{i}}^{2 + }}(aq) || {\rm{A}}{{\rm{g}}^ + }(aq)} \right|{\rm{Ag}}(s)\)

Use cell notation to describe the galvanic cell where copper(II) ions are reduced to copper metal and zinc metal is oxidized to zinc ions.

For the scenario in the previous question, how many electrons moved through the circuit.

If a sample of iron and a sample of zinc come into contact, the zinc corrodes but the iron does not. If a sample of iron comes into contact with a sample of copper, the iron corrodes but the copper does not. Explain this phenomenon.

Why must the charge balance in oxidation-reduction reactions?
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