Home
Class 12
CHEMISTRY
What are fuel cells ? Explain the electr...

What are fuel cells ? Explain the electrode reactions involved in the working of `H_(2) - O_(2)` fuel cell.

Text Solution

Verified by Experts

Those galvanic cells which give us direct electrical energy by the combustion of fuels like hydrogen, methane, methanol etc. are called fuel cell. The reactions taking place in hydrogen – oxygen fuel cell:
At cathode : `O_(2(g) + 2H_(2)O _(1) + 4e^(-)to 4OH_(aq)^(-)`
`underline(At anode : 2H_(2(g)+ 4OH^_(aq)^(-)rightarrow 4H_(2)O_((1))+ 4e`
Net reaction : `2H_(2)(g) + O_(2)(g) rightarrow 2H_(2) O _(1)`
Doubtnut Promotions Banner Mobile Dark
|

Similar Questions

Explore conceptually related problems

Define fuel cell?

How does H_(2)-O_(2) fuel cell operate?

Knowledge Check

  • EMF of an H_(2)-O_(2) fuel cell

    A
    Is indepenent of partial pressures of `H_(2)` and `O_(2)`
    B
    Decreases on increasing `P_(H_(2))` and `P_(O_(2))`
    C
    Increases on increasing `P_(H_(2))` and `P_(O_(2))`
    D
    Varies with the concentration of `OH^(-)` ions in the cathodic and anodic compartments.

  • A fuel cell is

    A
    the voltaic cells in which discontinuous supply of fuels are send at anode to give oxidation
    B
    the voltaic cell in which fuels such as : `CH_(4) , H_(2) , CO` are used up at anode
    C
    it involves the reactions of `H_(2) - O_(2)` fuel cell such as
    Cathode : `2 H_(2) + 4OH^(-) to 4 H_(2) O(l) + 4e`
    Anode : `O_(2) + 2 H_(2)O (l) + 4e to 4 OH^(-)`
    D
    the efficiency of a `H_(2) - O_(2)` fuel cell is very low

  • The electrode reactions that takes place at the anode of CH_(4)-O_(2) fuel cell is :

    A
    `2O_(2)+8H^(+)+8e^(-) rarr 4H_(2)O`
    B
    `CH_(4)+2H_(2)O rarr CO_(2)+8H^(+)+8e^(-)`
    C
    `CH_(4)+2O_(2) rarr O_(2)+2H_(2)O`
    D
    `2H^(+)+2e^(-) rarr H_(2)`

    • Similar Questions

    Explore conceptually related problems

    What are fuel cells ? Write canthode and anode reaction in a fuel cell.

    Describe the construction and working of hydrogen -oxygen (H_(2) - O_(2)) fuel cell.

    What are fuel cells ? Write the electrode reactions of a fuel cell which uses the reaction of hydrogen with oxygen.

    What is the basis of working of a fuel cell?

    The electrode reaction that takes place at the anode of CH_(4)-O_(2) fuel cell is:-

    Home
    Profile