Patent ID: 9580828
Date: 2017-02-28
CPC Classifications: C25D

Claim:
1. A self-terminating electrodeposition process for controlled growth of platinum monolayer film in an aqueous solution, the process comprising the steps of: in the aqueous solution, electrodepositing platinum or a platinum alloy onto a substrate such that a saturated underpotential deposited hydrogen layer is formed on the substrate, wherein, as the potential moves negative of an onset of proton reduction potential, a metal deposition reaction among the deposited platinum, the hydrogen layer and the aqueous solution is fully quenched, wherein the aqueous solution contains at least platinum salt; and pulsing the potential from a first value, a positive value at which no metal deposition occurs, to a second value, said second value being a more negative value than the first value, said second value being at least 0.05 V more negative or below the reversible hydrogen electrode potential of said solution, thus enabling formation on the substrate of two-dimensional platinum islands that substantially cover the substrate, said formation being followed by negligible further metal deposition on the substrate.