Oxygen reduction reaction on electrochemically deposited sub-monolayers and ultra-thin layers of Pt on (Nb-Ti)2AlC substrate

Pajić Mila N. Krstajić; Nevenka R. Elezović; Piotr Zabinski

doi:10.5937/zasmat2202153P

Authors

Pajić Mila N. Krstajić University of Belgrade, Faculty of Technology and Metallurgy, Serbia Author
Nevenka R. Elezović University of Belgrade, Institute for Multidisciplinary Research, Serbia Author
Piotr Zabinski AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Krakow, Poland Author

DOI:

https://doi.org/10.5937/zasmat2202153P

Keywords:

Platinum electrodeposition, oxygen reduction, acid solution

Abstract

Catalytic activity towards the oxygen reduction reaction (ORR) in 0.5 M H2SO4 was investigated at sub-monolayers and ultra-thin layers (corresponding to 10, 30 and 100 monolayers, (MLs)) of Pt electrochemically deposited on (Nb-Ti)2AlC substrate. Electrochemical deposition of Pt layers on (Nb-Ti)2AlC substrate was achieved from the solution containing 3 mM K2PtCl4 + 0.5 M NaCl (pH 4) under the conditions of convective diffusion (RPM = 400) using linear sweep voltammetry (LSV) at a sweep rate of 2 mV s-1 , by determining limiting potential for deposition of each Pt sample from the QPt vs. E curves. The Pt samples were characterized X-ray photoelectron spectroscopy (XPS). XPS analysis showed that practically the whole surface of (Nb-Ti)2AlC substrate is covered with homogeneous layer of Pt, while Pt ion reduction was complete to metallic form - Pt(0) valence state. Then oxygen reduction was studied at rotating disc electrode by cyclic voltammetry and linear sweep voltammetry. Two different Tafel slopes were observed, one close to 60 mV dec-1 in low current densities region and second one ~ 120 mV dec-1 in high current densities region. This novel catalyst exhibited higher activity in comparison to carbon supported one, in terms of mass activity - kinetic current density normalized to Pt loading.

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