Publication date: 15th December 2025
The transition to green energy is important, and an important part of this transition is fuel cells. Recently, the investigation into using formic acid as a fuel for fuel cells has been made. But a major setback for utilising formic acid as fuel is that carbon monoxide (CO) can be formed during the oxidation of formic acid as an unwanted by-product. The produced CO can poison the catalysts used for the reaction. It is therefore important to find catalysts that can be used in fuel cells that have a higher tolerance to CO.
In this research the electrodeposited AgAuCuPdPt high-entropy alloys have been investigated as such catalysts. These high-entropy alloys have previously been investigated by Salinas Quezada, Pedersen et al. 2024[1], but the authors did not electrodeposit the high-entropy alloys. To be able to have higher control of the metal composition of the high-entropy alloys, the hypothesis that they can be electrodeposited has been tested and confirmed through-out this work.
The high-entropy alloys were tested in both a CO-saturated environment and in formic acid and compared to a platinum sample. The CO-saturation of the high-entropy alloys was also compared to that of Salinas Quezada, Pedersen et al. 2024[1], and the electrodeposited high-entropy alloys were found to have a much higher activity than previously assumed.
In the CO-saturated environment, the high-entropy alloys showed a higher oxidation current than the platinum sample, and for the formic acid oxidation, the high-entropy alloys were found to be much more effective catalysts than platinum.
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