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I agree with the above. Platinum is only used in an electrode when you have nonconducting solids, or aqueous/gaseous substances in one half of your electrochemical cell (that is, in the absence of conducting metal/solid). This is because in every electrochemical cell you need some current conducting metal. Sometimes the metal will play a direct role in the reaction (like Fe or Ag), but in the case that you don't have any of those metals, then you would use a platinum electrode. Also, platinum electrodes are inert, which means they won't interfere with the reaction in any way.
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