Ag−Pt circular, hexagonal, and triangular nanoplates are successfully prepared by the galvanic displacement reaction and used as electrocatalysts for hydrogen evolution reaction. As an electrochemical analyses, fair comparison regarding the activity can be thus made among these newly electrocatalysts. The triangular Ag−Pt nanoplates are measured to have maximum electrochemical activity.

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Hollow Ag/Pd triangular nanoplates have been successfully prepared by a galvanic displacement reaction, in which added Pd(2+) ions react with Ag triangular nanoplates as templates. By altering the sizes of the Ag nanotemplates, Ag/Pd triangular nanoplates of different sizes can be prepared. Additionally, the large alloy nanoplates show maximum electrochemical activity when Ag/Pd triangular nanoplates of different sizes are applied as new activators for electroless nickel deposition.

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