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Published in: Journal of Nanoparticle Research 11/2022

01-11-2022 | Research paper

Effect of the configurations of N and S atoms on electrochemical performance of Pt for methanol oxidation

Authors: Rukan Suna Karatekin, Derya Kaya, Sedef Kaplan, Meltem Kahya Düdükcü

Published in: Journal of Nanoparticle Research | Issue 11/2022

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Abstract

Designing a highly efficient catalyst for methanol oxidation largely depends on fabricating a new material that exhibits a superior synergistic effect with Pt. Until now, heteroatom-doped graphene has been used as a promising material for deposition of highly ultrafine Pt particles. Also, each heteroatom has different configurations that affect the catalytic activity of the catalyst. N and S-doped graphene layer includes different types as a thiophenic S and oxidized S and different N types as a pyrrolic, graphitic, and pyridinic N. In this study, the effect of different types of S and N atoms (S type and N type) on methanol oxidation was investigated. For this, N, S co-doped graphene layer and its pyrolysed form at 500 °C were obtained and labeled N-S-rGO and p-N-S-rGO. Then, Pt was deposited chemically on N-S-rGO and p-N-S-rGO. The obtained catalysts (Pt–N-S-rGO and Pt-p-N-S-rGO) were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDX), mapping, X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Electrochemical performance of prepared electrodes for methanol oxidation was investigated by cyclic voltammetry (CV), electrochemical impedance (EIS), and amperometric measurements. Current densities of Pt–N-S-rGO and Pt-p-N-S-rGO electrodes were determined as 139.4 mA/cm2 and 86.17 mA/cm2, respectively. Besides, Pt–N-S-rGO exhibited higher anti-CO poisoning properties than Pt-p-N-S-rGO. It was concluded that the strong interaction between the oxidized S group and Pt caused Pt deposited on the graphene layer with ultra-small size and homogeneous, which increased catalytic activity of Pt–N-S-rGO towards methanol oxidation. Furthermore, it was found that Pt–N-S-rGO revealed 95.34% stability even after the long-term accelerating test.

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Appendix
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Metadata
Title
Effect of the configurations of N and S atoms on electrochemical performance of Pt for methanol oxidation
Authors
Rukan Suna Karatekin
Derya Kaya
Sedef Kaplan
Meltem Kahya Düdükcü
Publication date
01-11-2022
Publisher
Springer Netherlands
Published in
Journal of Nanoparticle Research / Issue 11/2022
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI
https://doi.org/10.1007/s11051-022-05617-x

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