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Platinum is a noble metal, meaning it is inert in electrochemical conducting. It can be used as both a cathode and an anode. We use platinum anodes/cathodes when the solution involves an aqueous product or reactant, or both in some cases. For example, a platinum conductor would be used for the half reaction Iron(III) +1e- --> Iron(II), since Iron (III) and Iron(II) are both aqueous cations.
We use metals like platinum in our galvanic cells when both the reactants and products of a half-reaction are not in a solid-state. For the example of a hydrogen cathode, the H+ ions(aq) are getting reduced into H2 gas. Without a platinum electrode, the electrons can not flow from the anode and get to the H+ and reduce it.
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