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Example the function of H_(2)-O_(2) fuel cell. |
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Answer» Solution :In this case, hydrogen act as a fuel and oxygen as an oxidend and the electrolyte is aqueous KOH maintained at `200^(@)`C and 20 - 40 atm. Porous graphite electrode containinng NI and NiO serves as the inert electrodes. Hydrogen and oxygen gases are bubbled through the anode and cathade, respectively. Oxidation occurs at the anode: `2H_2(G) + 4OH_((AQ))^(-) to 4H_2O_((l)) + 4e^(-)` Reduction occurs at the cathode `O_2(g) + 2H2O(l) + 4e^(-) to 4OH^(-)(aq)` The overall reaction is `2H_(2(g)) + O_(2)(g) to 2H_2O(l)` The above reactio is the same as the hydrogen combustion reaction, however, they do not react directly ie. the oxidation and reduction reactions take place separately at the anode and cathode respectively like `H_2 - O_2` fuel CELL. Other fuel cell like propane `-O_2` and methane `O_2` have also been developed . |
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