Galvanic replacement of copper adatoms from a Pt/Pt electrode surface in H_2PtCl_6 solutions

摘要

In the past decade, much attention has been given to the use of galvanic replacement as a method for the production and modification of nanostructured catalysts.~(1–5) This is largely associated with the problem of decreasing the content of expensive and scarce platinum-group metals in catalysts (electrocatalysts) for fuel cells.6 For example, platinum can be incorporated in catalysts in amounts corresponding to mono- and submonolayers by contact replacement of adatoms of a non-precious metal M_(1ad) by platinum atoms under open circuit conditions: M_(1ad) + (n/z) Pt~(z+) ? M_1~(n+) + + (n/z)Pt~0.~(1–3) The published data on replacement in adatom layers mostly concerned the surface structure of the resulting catalysts and their electrocatalytic activity in electrode reactions used in fuel cells.