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Isolated Pd sites as selective catalysts for electrochemical and direct hydrogen peroxide synthesis

Ledendecker, Marc, Pizzutilo, Enrico, Malta, Grazia, Fortunato, Guilherme V, Mayrhofer, Karl J. J., Hutchings, Graham J. and Freakley, Simon J. 2020. Isolated Pd sites as selective catalysts for electrochemical and direct hydrogen peroxide synthesis. ACS Catalysis 10 (10) , pp. 5928-5938. 10.1021/acscatal.0c01305
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Abstract

Palladium nanoparticles have been studied extensively as catalysts for the direct synthesis of hydrogen peroxide, where selectivity remains a key challenge. Alloying Pd with other metals and the use of acid and halide promoters are commonly used to increase H2O2 selectivity, however; the sites that can selectively produce H2O2 have not been identified and the role of these additives remains unclear. Here, we report the synthesis of atomically dispersed Pd/C as a model catalyst for H2O2 production without the presence of extended Pd surfaces. We show that these isolated cationic Pd sites can form H2O2 with significantly higher selectivity than metallic Pd nanoparticles in both the reaction of H2 and O2 and the electrochemical oxygen reduction reaction (ORR). This demonstrates that catalysts containing high populations of isolated Pd sites are selective catalysts for this two-electron reduction reaction and that the performance of materials in the direct synthesis reaction and ORR have many similarities.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: American Chemical Society
ISSN: 2155-5435
Date of First Compliant Deposit: 30 April 2020
Date of Acceptance: 23 April 2020
Last Modified: 30 Jun 2020 14:47
URI: http://orca-mwe.cf.ac.uk/id/eprint/131344

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