TY - JOUR
T1 - Integration of Platinum Group Metal-Free Catalysts and Bilirubin Oxidase into a Hybrid Material for Oxygen Reduction: Interplay of Chemistry and Morphology
AU - Rojas-Carbonell, Santiago
AU - Babanova, S.
AU - Serov, Alexey
AU - Artyushkova, Kateryna
AU - Workman, M.J.
AU - Santoro, C.
AU - Mirabal, A.
AU - Calabrese Barton, S.
AU - Atanassov, Plamen
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
U2 - 10.1002/cssc.201601822
DO - 10.1002/cssc.201601822
M3 - Article
VL - 10
SP - 1534
EP - 1542
JO - Chemsuschem
JF - Chemsuschem
SN - 1864-5631
ER -