____________________Dataset for Activity-stability relationship in magnetron co-sputtered bimetallic catalysts for proton exchange membrane fuel cells____________________ Last updated: 2025-01-31 ______Contact______ * Ivan Khalakhan * ORCID: 0000-0003-2929-4148 * Department of Surface and Plasma Science, Faculty of Mathematics and Physics Charles University * V Holešovičkách 2, 180 00 Prague 8, Czech Republic ______Principal Investigator______ * Karel Bouzek * ORCID: 0000-0002-0394-0634 * Dept. of Inorganic Technology. Faculty of Chemical Technology, University of chemistry and Technology, Prague * Technicka 5, 166 28, Prague 6, Czech Republic ______Data manager or custodian______ * Šárka Paušová * ORCID: 0000-0003-2494-1510 * Dept. of Inorganic Technology. Faculty of Chemical Technology, University of chemistry and Technology, Prague * Technicka 5, 166 28, Prague 6, Czech Republic ______Licence______ *Dataset for "Activity-stability relationship in magnetron co-sputtered bimetallic catalysts for proton exchange membrane fuel cells" © 2024 by Ivan Khalakhan is licensed under CC BY *licence information: https://creativecommons.org/licenses/by-nc-sa/4.0/?ref=chooser-v1 ------------------------------------------------------------------------------------------------ ______About the dataset______ In the present study, magnetron sputtered PtxM100-x (M = Co, Cu, Y; x = 25, 50, 75 and 100) bimetallic alloys were investigated as PEMFC cathodes. Accurate composition and layer thickness control enabled a systematic study of the correlation between the alloy composition, its activity, and stability. The catalysts underwent thorough characterization, employing a diverse portfolio of characterization techniques such as scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction and cyclic voltammetry. The activity of all investigated alloys was tested directly in a fuel cell device, while stability was assessed through potentiodynamic cycling in a half-cell. The activity-stability index, considering experimental results for both activity and stability, was calculated and compared for all investigated catalysts. All alloys exhibited a volcano-type trend in the activity-stability index as a function of the concentration of alloying element with maxima observed at Pt50Co50, Pt50Cu50 and Pt75Y25 for respective alloys, surpassing that of monometallic platinum. Overall, Pt50Co50 emerged as a catalyst with the highest activity-stability ratio. ______Methods of data collection______ Sample preparation Two DC magnetrons (TORUS, K. J. Lesker) with Pt (99.99%, Safina) and M targets (where M is either Co (99.95 %, K. J. Lesker), Cu (99.99 %, K. J. Lesker) or Y (99.99 %, K. J. Lesker)) operating simultaneously were used to deposit PtxM100-x alloys (x = 100, 75, 50 and 25). SEM measurements: MIRA 3 (Tescan) scanning electron microscope (SEM) operating at 30 keV energy. EDX measurements: Bruker XFlash detector (Bruker) attached to the SEM. XPS measurements: EnviroESCA (SPECS Surface Nano Analysis GmbH) with ultrahigh vacuum chamber equipped with a monochromated Al Kα X-ray source (hν = 1486.6 eV) and a Phoibos electron energy analyzer (SPECS). CV measurements: Electrochemical cell filled with N2-saturated 0.1M HClO4 solution. Three-electrode setup containing the investigated catalyst deposited onto glassy carbon (Pine Research, 5 mm diameter, 0.196 cm2 surface area) as a working electrode, a platinum wire (99.99%, Pine Research) as a counter electrode and leak-free Ag/AgCl in saturated KCl (Monokrystaly s.r.o.) as a reference electrode. SP-150 potentiostat (Bio-Logic). All CVs were captured at 200 mV s-1 scan rate. Electrochemical treatment: 1000 potentiodynamic linear cycles from 0 to 1 VRHE. Fuel cell test station: A pneumatically compressed (8 bars) graphite single-cell with an active area of 4 cm2 in a Greenlight TP-5 Research Cell test station. 0.3 mg.cm-2 40% Platinum on Vulcan – Carbon Paper Electrode as an anode. PtxM100-x (M = Co, Cu, Y; x = 25, 50, 75 and 100) as cathode. Nafion membrane (Nafion NR-212, thickness 50.8 μm, FuelCellStore) as an electrolyte. Measurements were performed at 70 °C with fully humidified H2 and O2 (AirLiquide, 99.999%) XRD measurements: The XRD measurements were performed using a SmartLab diffractometer (Rigaku) equipped with a 9 kW rotating anode X-ray source (Cu Kα radiation, λ = 0.15418 nm in the parallel beam glancing angle X-ray diffraction geometry (GAXRD) with a parallel beam Soller slit collimator (0.5° acceptance) in the diffracted beam. The constant angle of the incidence beam of 0.6° was used for the measurements. ______Methods of data processing______ The dataset contains only raw data, therefore no processing is described. ------------------------------------------------------------------------------------------------ ______File formats______ XPS spectra - original files exported to CSV EDX spectra - original files exported to XLS SEM images - original TIFF files Cyclic voltammograms - original files exported to CSV I-P and I-V curves - original files exported to CSV XRD diffractograms - original files exported to CSV ______Abbreviations______ XPS X-ray photoelectron spectroscopy EDX Energy dispersive X-ray spectroscopy SEM Scanning electron microscopy CV Cyclic voltammogram RHE Reversible hydrogen electrode XRD X-ray diffraction ______Units______ All XPS spectra are in binding energy (eV) vs. intensity (cps) All EDX spectra are in energy (keV) vs. intensity (cps) All CV are in potential versus reversible hydrogen electrode (V RHE) vs. current density (mA cm-2) All I-P curves are in current dencity (A cm-2) vs. power dencity (W cm-2) All I-V curves are in current dencity (A cm-2) vs. voltage (V) All XRD diffractograms are in angle (2theta) vs. intensity (cps) ------------------------------------------------------------------------------------------------ ______List of files______ SEM images: VZ2_007_021_UK_D_0001_v1.tif SEM image of Pt75Co25 sample VZ2_007_021_UK_D_0002_v1.tif SEM image of Pt50Co50 sample VZ2_007_021_UK_D_0003_v1.tif SEM image of Pt25Co75 sample VZ2_007_021_UK_D_0004_v1.tif SEM image of Pt75Cu25 sample VZ2_007_021_UK_D_0005_v1.tif SEM image of Pt50Cu50 sample VZ2_007_021_UK_D_0006_v1.tif SEM image of Pt25Cu75 sample VZ2_007_021_UK_D_0007_v1.tif SEM image of Pt75Y25 sample VZ2_007_021_UK_D_0008_v1.tif SEM image of Pt50Y50 sample VZ2_007_021_UK_D_0009_v1.tif SEM image of Pt25Y75 sample VZ2_007_021_UK_D_0010_v1.tif SEM image of Pt75Co25 sample after electrochemical treatment VZ2_007_021_UK_D_0011_v1.tif SEM image of Pt50Co50 sample after electrochemical treatment VZ2_007_021_UK_D_0012_v1.tif SEM image of Pt25Co75 sample after electrochemical treatment VZ2_007_021_UK_D_0013_v1.tif SEM image of Pt75Cu25 sample after electrochemical treatment VZ2_007_021_UK_D_0014_v1.tif SEM image of Pt50Cu50 sample after electrochemical treatment VZ2_007_021_UK_D_0015_v1.tif SEM image of Pt25Cu75 sample after electrochemical treatment VZ2_007_021_UK_D_0016_v1.tif SEM image of Pt75Y25 sample after electrochemical treatment VZ2_007_021_UK_D_0017_v1.tif SEM image of Pt50Y50 sample after electrochemical treatment VZ2_007_021_UK_D_0018_v1.tif SEM image of Pt25Y75 sample after electrochemical treatment EDX spectra: VZ2_007_021_UK_D_0019_v1.xls EDX spectrum of Pt75Co25 sample VZ2_007_021_UK_D_0020_v1.xls EDX spectrum of Pt50Co50 sample VZ2_007_021_UK_D_0021_v1.xls EDX spectrum of Pt25Co75 sample VZ2_007_021_UK_D_0022_v1.xls EDX spectrum of Pt75Cu25 sample VZ2_007_021_UK_D_0023_v1.xls EDX spectrum of Pt50Cu50 sample VZ2_007_021_UK_D_0024_v1.xls EDX spectrum of Pt25Cu75 sample VZ2_007_021_UK_D_0025_v1.xls EDX spectrum of Pt75Y25 sample VZ2_007_021_UK_D_0026_v1.xls EDX spectrum of Pt50Y50 sample VZ2_007_021_UK_D_0027_v1.xls EDX spectrum of Pt25Y75 sample VZ2_007_021_UK_D_0028_v1.xls EDX spectrum of Pt75Co25 sample after electrochemical treatment VZ2_007_021_UK_D_0029_v1.xls EDX spectrum of Pt50Co50 sample after electrochemical treatment VZ2_007_021_UK_D_0030_v1.xls EDX spectrum of Pt25Co75 sample after electrochemical treatment VZ2_007_021_UK_D_0031_v1.xls EDX spectrum of Pt75Cu25 sample after electrochemical treatment VZ2_007_021_UK_D_0032_v1.xls EDX spectrum of Pt50Cu50 sample after electrochemical treatment VZ2_007_021_UK_D_0033_v1.xls EDX spectrum of Pt25Cu75 sample after electrochemical treatment VZ2_007_021_UK_D_0034_v1.xls EDX spectrum of Pt75Y25 sample after electrochemical treatment VZ2_007_021_UK_D_0035_v1.xls EDX spectrum of Pt50Y50 sample after electrochemical treatment VZ2_007_021_UK_D_0036_v1.xls EDX spectrum of Pt25Y75 sample after electrochemical treatment XPS spectra: VZ2_007_021_UK_D_0037_v1.csv XPS spectra of monometallic Pt sample VZ2_007_021_UK_D_0038_v1.csv XPS spectra of Pt75Co25 sample VZ2_007_021_UK_D_0039_v1.csv XPS spectra of Pt50Co50 sample VZ2_007_021_UK_D_0040_v1.csv XPS spectra of Pt25Co75 sample VZ2_007_021_UK_D_0041_v1.csv XPS spectra of Pt75Cu25 sample VZ2_007_021_UK_D_0042_v1.csv XPS spectra of Pt50Cu50 sample VZ2_007_021_UK_D_0043_v1.csv XPS spectra of Pt25Cu75 sample VZ2_007_021_UK_D_0044_v1.csv XPS spectra of Pt75Y25 sample VZ2_007_021_UK_D_0045_v1.csv XPS spectra of Pt50Y50 sample VZ2_007_021_UK_D_0046_v1.csv XPS spectra of Pt25Y75 sample CV: VZ2_007_021_UK_D_0047_v1.csv CV of Pt75Co25 sample VZ2_007_021_UK_D_0048_v1.csv CV of Pt50Co50 sample VZ2_007_021_UK_D_0049_v1.csv CV of Pt25Co75 sample VZ2_007_021_UK_D_0050_v1.csv CV of Pt75Cu25 sample VZ2_007_021_UK_D_0051_v1.csv CV of Pt50Cu50 sample VZ2_007_021_UK_D_0052_v1.csv CV of Pt25Cu75 sample VZ2_007_021_UK_D_0053_v1.csv CV of Pt75Y25 sample VZ2_007_021_UK_D_0054_v1.csv CV of Pt50Y50 sample VZ2_007_021_UK_D_0055_v1.csv CV of Pt25Y75 sample Polarization (I-V) curves: VZ2_007_021_UK_D_0056_v1.csv I-V curve of monometallic Pt sample VZ2_007_021_UK_D_0057_v1.csv I-V curve of Pt75Co25 sample VZ2_007_021_UK_D_0058_v1.csv I-V curve of Pt50Co50 sample VZ2_007_021_UK_D_0059_v1.csv I-V curve of Pt25Co75 sample VZ2_007_021_UK_D_0060_v1.csv I-V curve of Pt75Cu25 sample VZ2_007_021_UK_D_0061_v1.csv I-V curve of Pt50Cu50 sample VZ2_007_021_UK_D_0062_v1.csv I-V curve of Pt25Cu75 sample VZ2_007_021_UK_D_0063_v1.csv I-V curve of Pt75Y25 sample VZ2_007_021_UK_D_0064_v1.csv I-V curve of Pt50Y50 sample VZ2_007_021_UK_D_0065_v1.csv I-V curve of Pt25Y75 sample Power density (I-P) curves: VZ2_007_021_UK_D_0066_v1.csv I-V curve of monometallic Pt sample VZ2_007_021_UK_D_0067_v1.csv I-P curve of Pt75Co25 sample VZ2_007_021_UK_D_0068_v1.csv I-P curve of Pt50Co50 sample VZ2_007_021_UK_D_0069_v1.csv I-P curve of Pt25Co75 sample VZ2_007_021_UK_D_0070_v1.csv I-P curve of Pt75Cu25 sample VZ2_007_021_UK_D_0071_v1.csv I-P curve of Pt50Cu50 sample VZ2_007_021_UK_D_0072_v1.csv I-P curve of Pt25Cu75 sample VZ2_007_021_UK_D_0073_v1.csv I-P curve of Pt75Y25 sample VZ2_007_021_UK_D_0074_v1.csv I-P curve of Pt50Y50 sample VZ2_007_021_UK_D_0075_v1.csv I-P curve of Pt25Y75 sample VZ2_007_021_UK_D_0076_v1.csv Specific power (Psp), Stability index (X) and activity-stability index (K) for monometallic Pt sample as well as Pt-Co, Pt-Cu and Pt-Y alloys XRD diffractograms: VZ2_007_021_UK_D_0077_v2.csv XRD diffractogram of monometallic Pt sample VZ2_007_021_UK_D_0078_v2.csv XRD diffractogram of Pt75Co25 sample VZ2_007_021_UK_D_0079_v2.csv XRD diffractogram of Pt50Co50 sample VZ2_007_021_UK_D_0080_v2.csv XRD diffractogram of Pt25Co75 sample VZ2_007_021_UK_D_0081_v2.csv XRD diffractogram of Pt75Cu25 sample VZ2_007_021_UK_D_0082_v2.csv XRD diffractogram of Pt50Cu50 sample VZ2_007_021_UK_D_0083_v2.csv XRD diffractogram of Pt25Cu75 sample VZ2_007_021_UK_D_0084_v2.csv XRD diffractogram of Pt75Y25 sample VZ2_007_021_UK_D_0085_v2.csv XRD diffractogram of Pt50Y50 sample VZ2_007_021_UK_D_0086_v2.csv XRD diffractogram of Pt25Y75 sample