Electrochemical growth and oxygen reduction property of Ag nanosheet arrays on a Ti/TiO2 electrode

A standing Ag nanosheet array was successfully deposited using an electrochemical method. The results demonstrated that the adsorption of polyvinylpyrrolidone (PVP) over the Ag (111) plane during deposition (1) inhibits the crystalline growth in the [111] direction, (2) stacks atomic faults in the fcc structure, and (3) forms a standing Ag nanosheet composed essentially of (111) planes. In an application, this Ag nanosheet array can be successfully used as an oxygen reduction catalyst. Based on Koutecky–Levich equation, the involved electron number at −0.2 V was 3.97.

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► A standing Ag nanosheet array has been successfully deposited using an electrochemical method.
► PVPs are used as an additive to govern the growth direction on nanosheet.
► This forms a standing Ag nanosheet composed essentially of (111) planes.
► The Ag nanosheet array has been successfully as catalyst for oxygen reduction reaction.