Platinum is an effective catalyst for the oxidation of SOMs such as glucose and methanol but suffers from issues such as high cost and catalyst poisoning by intermediates produced in the oxidation process. Binary alloys of Pt paired with transition metals such as Au have been shown to reduce these costs and improve the catalytic properties of Pt-based catalysts by lowering the overpotential associated with the oxidation of the carbon monoxide (CO) intermediate. In this project, we synthesized, characterized, and electrochemically investigated the catalytic properties of nanowire (NW) catalysts composed of binary transition metal alloys of various compositions of Pt and Au. The alloy NWs were synthesized using an ambient, solution-based technique that allowed for the fine-tuning of their size and composition. The NWs were characterized using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and powder X-ray diffraction (XRD). The kinetics of the NW catalysts toward the oxidation of SOMs were investigated using linear sweep voltammetry and it was found that the trends in catalytic performance and the mechanism of oxidation of these SOMs were dependent on the morphology and composition of the alloy NWs. The limit of detection (LOD) and sensitivity for glucose detection were determined as a function of wire composition and were consistent with or better than those of other Pt nanostructures. We are currently investigating the potential of binary nanowires as multifunctional catalysts for a variety of biologically relevant SOMs.

Composition-dependent catalytic activity of binary Pt-based nanowires for the electrochemical oxidation and detection of small organic molecules

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.