Integration of Platinum Group Metal-Free Catalysts and Bilirubin Oxidase into a Hybrid Material for Oxygen Reduction: Interplay of Chemistry and Morphology.
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 properties 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. Furthermore, 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.
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Santiago
S
Rojas-Carbonell
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Sofia
S
Babanova
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Alexey
A
Serov
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Kateryna
K
Artyushkova
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Michael J
MJ
Workman
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Carlo
C
Santoro
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA.
Alex
A
Mirabal
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, 48824, USA.
Scott
S
Calabrese Barton
Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Advanced Materials Lab, 1001 University Blvd. SE Suite 103, MSC 04 2790, Albuquerque, NM, 87131, USA.
Plamen
0000-0003-2996-472X
P
Atanassov
D002384:Catalysis; D004563:Electrochemistry; D010084:Oxidation-Reduction; D044925:Oxidoreductases Acting on CH-CH Group Donors / Q000737:chemistry* / Q000378:metabolism; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties
D010984:Platinum; D044925:Oxidoreductases Acting on CH-CH Group Donors; C042401:bilirubin oxidase; D010100:Oxygen
bilirubin oxidase; hybrid catalyst; oxygen reduction reaction; pgm-free catalyst; surface characterization