| Abstract
| - We deposit Pt particles electrochemically on an electrode covered with a Nafion membrane. Platinum ionstravel through the hydrophilic channels of the membrane, and platinum deposits are formed at the placewhere the channels make contact with the planar electrode. This procedure deposits the catalyst only at theend of the hydrophilic channels that cross the membrane; no catalyst is placed under the hydrophobic domains,where it would not be in contact with the electrolyte. By performing a series of cyclic voltammograms withthis system, we show that deposition of the platinum through the membrane achieves better platinum utilizationthan deposition of platinum on the naked electrode followed by the placement of the membrane on top.
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