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Question
Write working of NICAD storage cell. Also write its applications.
Solution
Working of NICAD:
NICAD is a rechargeable secondary dry cell. It consists of a cadmium anode. The cathode is nickel(IV) oxide, NiO2 supported on Ni. The electrolyte solution is basic (KOH).
The electrode reactions taking place are:
| \[\ce{Cd_{(s)} + 2OH^-_{ (aq)} -> Cd(OH)_{2(s)} + 2e-}\] | (Oxidation at anode) |
| \[\ce{NiO_{2(s)} + 2H2O_{(l)} + 2e- -> Ni(OH)_{2(s)} + 2OH^-_{ (aq)}}\] | (Reduction at cathode) |
| Overall cell reaction: \[\ce{Cd_{(s)} + NiO_{2(s)} + 2H2O_{(l)} -> Cd(OH)_{2(s)} + Ni(OH)_{2(s)}}\] |
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The cell can be recharged as the reaction products are solids that adhere to the electrode surface. It produces a potential of about 1.4 V. The cell has longer life than other dry cells.
Applications of NICAD:
The NICAD cell is used in electronic watches, calculators, photographic equipment.
RELATED QUESTIONS
Answer the following in brief.
Why do the cell potential of lead accumulators decrease when it generates electricity? How the cell potential can be increased?
Answer the following:
What are anode and cathode for Leclanche' dry cell?
Write the potential produced through the NICAD storage cell.
Mercury battery provides more constant voltage than any other dry cell: Explain.
Why is Nickel-cadmium cell referred to as a secondary cell?
Find INCORRECT statement with reference to NICAD cell.
Which of the following statements are CORRECT for NICAD cell and mercury battery?
I. Both can be recharged.
II. Both cannot be recharged.
III. Both are secondary voltaic cells.
IV. Both cells work using an acidic electrolyte.
Identify the INCORRECT statement about mercury battery.
The mercury battery provides a constant voltage of ____________.
During discharging the change taking place at cathode in lead accumulator is:
When dry cell is in use the change taking place at cathode is ______.
Which cells is used as a source of power in flashlights?
In dry cell, what acts as a negative electrode?
What is the density of the solution of sulphuric acid used as an electrolyte in a lead accumulator?
NICAD storage cell is made up of ______ electrodes.
Draw a neat labelled diagram of a lead accumulator.
Write the net cell reaction during discharging of lead accumulator.
