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Highly Selective Hydrogen Peroxide Production Using an AgPd-Based Electrocatalyst with Ultralow Pd Loading

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Efficient electrocatalysts are key to advancing H 2 O 2 production via the oxygen reduction reaction (ORR), but challenges like high material costs and low efficiency hinder progress. Based on this, this study focuses on the development and evaluation of a bimetallic AgPd/C electrocatalyst with ultralow Pd loading (0.2 wt %) designed for the selective ORR, specifically targeting the production of H 2 O 2 . The catalyst was synthesized using a galvanic replacement method, combining Ag and Pd in a random atomic arrangement on Vulcan XC-72 carbon support to optimize the dispersion and conductivity of active sites. Electrochemical analyses revealed that the AgPd/C electrocatalyst exhibited remarkable selectivity for H 2 O 2, maintaining selectivity above 75% within a defined potential range. This selectivity significantly outperformed the Vulcan XC-72 catalyst, which showed a notable decline over the same range. Furthermore, the AgPd/C catalyst displayed superior resistance to methanol crossover compared to commercial Pt/C electrocatalysts, demonstrating its potential for stable and efficient operation in methanol-fueled applications. The combination of Ag and Pd enhanced the selectivity for the two-electron ORR mechanism and reduced energy requirements for initiating electroreduction, making it a promising candidate for applications requiring high H 2 O 2 selectivity, such as green chemical processes. Our findings suggest that the selective 2e – ORR behavior arises from the surficial structure achieved via the galvanic replacement synthesis with ultralow Pd content.

Source: ACS Omega

DOI: 10.1021/acsomega.5c04823