Abstract
Multi-walled carbon nanotubes (MWCNTs) were decorated with palladium nanoparticles (Pd NPs) by laser-ablation of a physical mixture of MWCNTs and Pd NPs without using any reducing agent. The morphology and composition of MWCNT/Pd were analysed by complementary techniques involving Fourier transform infrared spectrometry, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. Using cyclic voltammetry and chronoamperometry, the electrocatalytic activity and stability of CNT/Pd were evaluated for the electrochemical oxidation of methanol in a basic medium. Comparative investigations were provided with laser-ablated Pd NPs (LA Pd) catalyst concerning catalytic activity and stability. MWCNT/Pd exhibited remarkably high catalytic activity (104.20 mA mg−1) in comparison to the LA Pd catalyst (14.41 mA mg−1). The catalyst was found to exhibit long-term stability even after 3600 s of operation and high resistance towards CO poisoning. It is suggested that the MWCNT/Pd would be valuable as an active electrocatalyst for its commercial applications in direct methanol fuel cells.
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Acknowledgements
This work was monetarily aided by the DST project under the Nanomission scheme of New Delhi, Grant no. SR/NM/NS1024/2016. The authors SA and MA thank MHRD, New Delhi, for approving a scheme for promotion of Academic and Research Collaboration project (SPARC/2018-2019/P236/SL). Ms Reshma thanks MHRD for the PhD fellowship.
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Kaimal, R., Yogesh, G.K., Sastikumar, D. et al. Laser-assisted decoration of carbon nanotubes with palladium nanoparticles for application in electrochemical methanol oxidation. Bull Mater Sci 44, 125 (2021). https://doi.org/10.1007/s12034-021-02428-z
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DOI: https://doi.org/10.1007/s12034-021-02428-z