“Nanostructured surfaces”
Galvanic replacement – method of produced catalytically active nanostructured electrodes M/Cu for CO2 conversion

Zozulia G.I., Mertsalo I.Р., Kuntyi O.I., Shepida M.V.,
 Mandych M.V., Konda T.G.

Lviv Polytechnic National University, 12 Bandera Str., Lviv 79013, Ukraine.
E-mail: gzozula@ukr.net

During the past decade, great attention is paid to the use of galvanic replacement as a method for the production and modification of nanostructured catalytically active electrodes [1, 2]. However, the spontaneous passage of proceses in this method complicates the controlled formation geometry particles of the metal on the surface of the electrode. The purpose of the work is establish the influence of conditions of galvanic replacement on the morphology of nanostructured nobels metals of catalytically active copper electrodes for CO2 convertion.
Galvanic replacement of silver, gold, platinum and palladium on the surface of electrolytic copper has been investigated. It is established that the main condition for the formation of nanostructured deposits is high cathode polarization. Shown that the main settings of influence on the morphology of metals depositions and the geometry of their structural particles are the composition of the solution, temperature and duration of the process. With increasing stability of the complex, which is equivalent to the growth of cathode polarization, there is a tendency to decrease the size of the metal particles on the substrate surface. Increasing the temperature and duration of galvanic replacement promote to the growth of particles and the formation of porous film depositions on the copper surface.
The obtained nanostructured M/Cu electrodes were tested in cathode conversion of CO2. The dependences of their catalytic activity and selectivity on the nature of the deposited metal, the shape and size the nanoparticles and the uniformity and density of their distribution on the surface of the copper substrate are established.

1.	Papaderakis A., Mintsouli I., Georgieva J., Sotiropoulos . Electrocatalysts Prepared by Galvanic Replacement  // J. Catalysts.-2017.-80.-P. 34 
2.	Mahara Y., Ishikawa H., Ohyama J., Sawabe K., Satsuma A. Ag–M (M:Ni,Co,Cu,Fe) bimetal catalysts prepared by galvanic deposition method for CO oxidation // Catalys. Today.-2016.-265.-P. 2-6.