Potential of Platinized Platinum Versus Shiny Platinum
In hydrogen saturated hydrochloric acid, the shiny platinum electrode is observed to assume positive potential versus that of platinum black at zero net current (+ 340 mV at room temperature). With the temperature increasing to 70 °C, the difference in potentials dropped to zero. The reason for this is not perfectly clear, although several explanations have been proposed.
Read more about this topic: Platinum Black
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