Aluminium terbium alloys were prepared by simultaneous thermal evaporation resulting in a thin film library covering a 5 to 25 at.% Tb compositional spread. Synchrotron x-ray diffraction (XRD) proves all of the alloys to be amorphous. Scanning electron microscopy (SEM) measurements reveal the structural changes upon increase in Tb content with the formation of small, Tb-rich segregations right before a drastic change in morphology around 25 at.% Tb. Anodic oxides were formed systematically in cyclic voltammograms using scanning droplet cell microscopy. Coulometric analysis revealed a linear thickness over formation potential behaviour with film formation factors ranging from 1.2 nm V−1 (5 at.% Tb) to 1.6 nm V−1 (25 % Tb). Electrochemical impedance spectroscopy was performed for each incremental oxidation step resulting in a linear relation between inverse capacity and formation potential with dielectric constants ranging from 8 (5 at.% Tb) to 16 (25 at.% Tb).
A CuZn thin film combinatorial library was fabricated using a thermal co‐evaporator. Using scanning electron microscopy (SEM), X‐ray fluorescence spectroscopy (XRF) and X‐ray diffraction (XRD) microcstructure, composition and crystallographic properties were investigated. Pure brass alloys were evidenced due to solid solution mixing of Cu and Zn. The crystallite size and lattice parameters were calculated and compared with values of pure Cu and α‐brass. With the aid of scanning in a wide compositional spread (3.4 at.% Zn to 27 at.% Zn). droplet cell microscopy (SDCM) the thermally evaporated CuZn thin film combinatorial library was screened for electrocatalytic effects on the formaldehyde oxidation. The obtained cyclic voltammograms show the occurrence of the formaldehyde oxidation leading to formic acid. CuZn thin film alloys were examined for their electrocatalytic oxidation of formaldehyde in an aqueous 0.1 M Na2SO4 solution at different pH values using cyclic voltammetry. The highest catalytic effect was obtained at a pH value of 13.0 for a composition of Cu–8.0 at.% Zn.
A Cu-Ni thin film combinatorial library deposited using a co-evaporation technique was screened for electrocatalytic oxidation of glucose in NaOH electrolyte using a flow-type scanning droplet cell microscope. The crystallographic characteristics and surface microstructure were mapped along the compositional spread using scanning XRD and SEM. The obtained compositional spread of approximately 1-14 at.% Ni showed suitability for being used in glucose detection as evidenced by cyclic voltammetry studies. Increasing the Ni amount resulted in increased glucose electrocatalytic oxidation. The linearity observed between the current density and inverse scan rate for various rates of potential increase revealed a diffusion limited process. Amperometric measurements performed at various applied potentials indicated an increase in the current density plateaus responsible for glucose detection of more than 5 mA cm À2 .
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