Nano-Structured Bio-Inorganic Hybrid Material for High Performing Oxygen Reduction Catalyst.
In this study, we demonstrate a non-Pt nanostructured bioinorganic hybrid (BIH) catalyst for catalytic oxygen reduction in alkaline media. This catalyst was synthesized through biomaterial hemin, nanostructured Ag-Co alloy, and graphene nano platelets (GNP) by heat-treatment and ultrasonically processing. This hybrid catalyst has the advantages of the combined features of these bio and inorganic materials. A 10-fold improvement in catalytic activity (at 0.8 V vs RHE) is achieved in comparison of pure Ag nanoparticles (20-40 nm). The hybrid catalyst reaches 80% activity (at 0.8 V vs RHE) of the state-of-the-art catalyst (containing 40% Pt and 60% active carbon). Comparable catalytic stability for the hybrid catalyst with the Pt catalyst is observed by chronoamperometric experiment. The hybrid catalyst catalyzes 4-electron oxygen reduction to produce water with fast kinetic rate. The rate constant obtained from the hybrid catalyst (at 0.6 V vs RHE) is 4 times higher than that of pure Ag/GNP catalyst. A catalytic model is proposed to explain the oxygen reduction reaction at the BIH catalyst.
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory , 2800 Powder Mill Road, Adelphi, Maryland 20783-1197, United States.
Rongzhong
R
Jiang
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory , 2800 Powder Mill Road, Adelphi, Maryland 20783-1197, United States.
Dat T
DT
Tran
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory , 2800 Powder Mill Road, Adelphi, Maryland 20783-1197, United States.
Joshua P
JP
McClure
Sensors and Electron Devices Directorate, U.S. Army Research Laboratory , 2800 Powder Mill Road, Adelphi, Maryland 20783-1197, United States.
Deryn
D
Chu
D000497:Alloys / Q000737:chemistry*; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D006108:Graphite / Q000737:chemistry*; D006427:Hemin / Q000737:chemistry*; D007700:Kinetics; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
D000497:Alloys; D014867:Water; D003035:Cobalt; D012834:Silver; D010984:Platinum; D006427:Hemin; D006108:Graphite; D010100:Oxygen
Ag−Co; bio-inorganic hybrid catalyst; graphene nanoplatelets; hemin; oxygen reduction reaction