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DS: Fachverband Dünne Schichten
DS 28: Thin Film Applications
DS 28.2: Talk
Wednesday, March 9, 2016, 10:00–10:15, H8
Screening of Copper-Nickel thin film combinatorial library for electrocatalytic applications — •Isabella Pötzelberger1, Andrei Ionut Mardare1,2, and Achim Walter Hassel1,2 — 1Institute for Chemical Technology of Inorganic Materials Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria — 2Christian Doppler Laboratory for Combinatorial Oxide Chemistry at the Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria
A Cu-Ni thin film combinatorial library was screened for electrocatalytic oxidation of formaldehyde in alkaline solution using a 3D-printed flow type scanning droplet cell microscope. The entire compositional spread (1 to 14 at.% Ni) showed suitability for being used in formaldehyde detection with different efficiencies as evidenced by cyclic voltammetry performed with and without formaldehyde addition to the electrolyte. This difference is directly linked to the electrocatalysis of the oxidation process. Therefore a surface microstructure evolution along the library was investigated by SEM. Kinetic studies performed by varying rates of potential increase revealed a diffusion limited process as evidenced by the observed linearity between the current density and inverse scan rate. Amperometric measurements performed at various applied potentials indicated a sufficiently large increase in the current density plateaus responsible for formaldehyde detection suitable for being implemented in device fabrication showing a good reproducibility and stability in the electrocatalytic oxidation of formaldehyde.