Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)
Publication date: 22nd July 2026
The reduction of platinum loading while maintaining high catalytic activity is a key challenge in the development of electrocatalysts for energy conversion technologies. In this work, platinum layers with ultralow Pt loading were prepared on gold substrates using an electroless deposition approach based on galvanic displacement. The method consists of two consecutive steps: electrochemical deposition of a sacrificial copper layer followed by its spontaneous replacement by platinum from a chloroplatinate solution. This strategy enables controlled Pt deposition using significantly lower amounts of noble metal compared with conventional preparation techniques.
The deposited structures were characterized by X-ray photoelectron spectroscopy (XPS), which confirmed the presence of metallic platinum and provided information about its chemical state and surface coverage, revealing Pt loadings in the range corresponding to nanometer-scale surface layers.
Electrochemical performance was evaluated using a rotating disk electrode in both alkaline and acidic electrolytes. Particular attention was paid to the oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR). The Pt-modified Au electrodes exhibited promising ORR specific activity despite the extremely low platinum content, indicating efficient utilization of the deposited Pt. The results demonstrate that electroless deposition might represent a simple, scalable, and cost-effective route for the preparation of platinum electrocatalysts with substantially reduced noble metal consumption.
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