Integration of Platinum Group Metal-Free Catalysts and Bilirubin Oxidase into a Hybrid Material for Oxygen Reduction: Interplay of Chemistry and Morphology

Santiago Rojas-Carbonell, S. Babanova, Alexey Serov, Kateryna Artyushkova, M.J. Workman, C. Santoro, A. Mirabal, S. Calabrese Barton, Plamen Atanassov

Research output: Contribution to journalArticlepeer-review

Abstract

Catalytic activity toward the oxygen reduction reaction (ORR) of platinum group metal-free (PGM-free) electrocatalysts integrated with an enzyme (bilirubin oxidase, BOx) in neutral media was studied. The effects of chemical and morphological characteristics of PGM-free materials on the enzyme enhancement of the overall ORR kinetics was investigated. The surface chemistry of the PGM-free catalyst was studied using X-ray Photoelectron Spectroscopy. Catalyst surface morphology was characterized using two independent methods : length-scale specific image analysis and nitrogen adsorption. Good agreement of macroscopic and microscopic morphological proper- ties was found. Enhancement of ORR activity by the enzyme is influenced by chemistry and surface morphology of the catalyst itself. Catalysts with a higher nitrogen content, specifically pyridinic moieties, showed the greatest enhancement. Further- more, catalysts with a higher fraction of surface roughness in the range of 3–5 nm exhibited greater performance enhancement than catalysts lacking features of this size.
Original languageEnglish
Pages (from-to)1534-1542
Number of pages9
JournalChemsuschem
Volume10
Early online date28 Feb 2017
DOIs
Publication statusPublished - 2017

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