galvanic replacement

The effectiveness of the galvanic replacement method for decorating a porous surface with metal nanoparticles and nanostructures is considered. It is shown that depending on the functional purpose, foam, porous, and dendritic metal 3D substrates are mainly used for modification by galvanic replacement. In particular, these are nickel and copper substrates on which noble metals are deposited. The peculiarities of the formation of nanosized deposits on porous copper and nickel surfaces depending on the structure of the latter and the conditions of galvanic substitution are given.

The possibilities of the galvanic replacement method in the formation of a metallic nanostructured surface for electrocatalytic processes are revealed. Based on the electrochemical mechanism of the process and taking into account the type of substrate, the following directions of application of this method are presented: metal surface modification and synthesis of metallic nanostructures.

The controlled synthesis of parts of noble metals of a given morphology, shape, size and distribution on the floor emphasizes the important prerequisite for the creation of complex structures, for example nanowire, are one of the most promising materials for the creation of modern devices.

One of the promising methods of such a modification is a method of galvanic replacement, which is characterized by wide possibilities of controlled influence on the morphology of the deposited nanostructured metal. The deposition of silver by galvanic replacement is most studied in aqueous solutions of AgNO3 in the presence of HF. However, the hydrolysis of formed compounds of silicon, the change in pH, and the electrical renewal of hydrogen do not always provide a controlled formation of metal nanoparticles.