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Electrodeposited Pd Nanoparticles onto Fe3O4-S-rGO for Methanol Electro-oxidation

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Abstract

A series of Pd/Fe3O4@S-rGO was synthesized under various deposition times of Pd and their catalytic activity was investigated in alkaline media via chronoamperometry (CA), cyclic voltammetry (CVs), and electrochemical impedance spectroscopy (EIS) for the methanol oxidation reaction. For the S source, sodium dodecylbenzene sulfonate (SDBS) was used to obtain ultrafine Fe3O4 particles and enhance the graphene layer properties. Through the characterization measurements, it is concluded that Pd was deposited successfully onto Fe3O4@S-rGO (S and Fe3O4 dual-doped reduced graphene oxide) with nanoscale cubic lattice nanostructure. In the presence of Fe3O4, the band gap of Pd450/ITO decreased from 3.46 to 1.74 eV. The band gap of fabricated catalyzes changed with the deposition time of Pd. In addition, the synergistic effect between Pd and Fe3O4 enhances the catalytic activity of the electrode toward methanol oxidation when compared bulk Pd electrode. The Pd450/Fe3O4@S-rGO electrocatalyst showed a current density of 22.3 mA cm−2 at a scan rate of 30 mV s−1 with remarkable long-term stability in 0.5 M methanol in 1 M NaOH. This value is 2.2 times higher than the Pt/C (10 mAcm−2) catalyst under the same conditions. With modifying Fe3O4 the Tafel slope of Pd450/ITO decreased from 180 to 118 mVdec−1.

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Authors and Affiliations

  1. Department of Chemistry, Mersin University, Mersin, Turkey

    Rukan Suna Karatekin & Sedef Kaplan

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  1. Rukan Suna Karatekin
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  2. Sedef Kaplan
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Contributions

R.S. Karatekin: supervision, writing—review and editing, conceptualization, software, methodology, and original draft preparation. S. Kaplan: investigation and data curation.

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Correspondence to Rukan Suna Karatekin.

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Suna Karatekin, R., Kaplan, S. Electrodeposited Pd Nanoparticles onto Fe3O4-S-rGO for Methanol Electro-oxidation. Electrocatalysis 14, 901–911 (2023). https://doi.org/10.1007/s12678-023-00845-8

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