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FUEL CELLS

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A fule cell si like a battery. It has two electrodes where the reactions take place and an electrolyte which carries the charged particles from one electrode to the other . These cells convert chemical energy inyo electrical energy. Fuel cells have to be supplied by an external source of fuel (e.g., hydrogen) and an oxidant such as oxygen or air. The fuels used are pollution free and have high efficiency. One of the example of hydrogen - oxygen fuel cell. The electrolyte plays an essential role as well. It only allows the appropriate ions were allowed to flow between the anode and cathode, the chemical reactions within the cell would be disrupted.
The net reaction taking place in fuel cell is :
`{:("Anode",[H_(2)(g)+2OH^(-)(aq)to 2H_(2)O(l)+2e^(-)]xx2),("Cathode",O_(2)(g)+2H_(2)O(l)+4e^(-)to4OH^(-)(aq)):}/("Overall reaction"" "2H_(2)(g)+O_(2)(g)to2H_(2)O(l))`
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Knowledge Check

  • The advantage of methane fuel cells over internal combusion engines (ICEs) that burn methane include which of the following? (P) Methane fuel cells are less polluting. (Q) Methane fuel cells are more efficient. (R ) Methane fuel cells are less expensive.

    A
    P only
    B
    P and Q only
    C
    Q and R only
    D
    P, Q and R

  • Fuel cell involves following reaction (s) :

    A
    `O_(2)(g)+2H_(2)O(l)+4e^(-) rarr 4OH^(-) (aq.) " (at cathode)"`
    B
    `O_(2)(g)+2H_(2)O(l)+4e^(-) rarr 4OH^(-) (aq.)" (at anode)"`
    C
    `2H_(2)(g)+4OH^(-) (aq.) rarr 4H_(2)O(l)+4e^(-)" (at anode)"`
    D
    `2H_(2)(g)+4OH^(-) (aq.) rarr 4H_(2)O (l) +4e^(-)" (at cathode)"`

  • 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.

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    What is a fuel cell ? Give advantages of a fuel cell.

    Fuel cell is an electrical cell which converts chemical energy into electrical energy. The most successful fuel cell is H_(2)-O_(2) fuel cell, which is known as Bacon cell. It had been used to fulfil the electric power supply required in Appolo mission. This fuel cell is pollution free. Fuel cells are preferred to other energy producing devices in space because of

    Fuel cell is an electrical cell which converts chemical energy into electrical energy. The most successful fuel cell is H_(2)-O_(2) fuel cell, which is known as Bacon cell. It had been used to fulfil the electric power supply required in Appolo mission. This fuel cell is pollution free. The fuel used in the cell used in Appolo mission was

    Fuel cell is an electrical cell which converts chemical energy into electrical energy. The most successful fuel cell is H_(2)-O_(2) fuel cell, which is known as Bacon cell. It had been used to fulfil the electric power supply required in Appolo mission. This fuel cell is pollution free. The cell used in Appolo mission was

    A fuel cell is

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