8 research outputs found
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