CHEMICAL DEPOSITION OF PLATINUM ON ION-EXCHANGE MEMBRANES WITH PREFORMED GROWTH CENTERS

The article discusses a combined method for the formation of a catalytic coating on the surface of polymer electrolytic membranes. The proposed approach combines preliminary magnetron sputtering of platinum to create adsorption centers and subsequent chemical precipitation of the metal from solution. A comparative analysis of various compositions of solutions for chemical precipitation was carried out and the optimal composition based on hexachloroplatinic acid, hydrazine and ammonium hydroxide was determined, ensuring the formation of a uniform and durable coating at a temperature of 20−22 °C. It has been
experimentally shown that the combined technology makes it possible to create a porous nanostructured surface with high adhesion of the catalytic layer, resistant to mechanical stress.
The study of the operating characteristics of the membrane-electrode unit demonstrated a significant increase in hydrogen production compared to samples obtained only by magnetron sputtering or only by chemical deposition.