Pd-NiO decorated multiwalled carbon nanotubes supported on reduced graphene oxide as an efficient electrocatalyst for ethanol oxidation in alkaline medium

Dhanushkotti Rajesh, Pulidindi Indra Neel, Arumugam Pandurangan, Chinnathambi Mahendiran

Research output: Contribution to journalArticlepeer-review

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Abstract

The synthesis of Pd-NiO nanoparticles decorated multiwalled carbon nanotubes (MWCNTs) on reduced graphene oxide (rGO) for ethanol electrooxidation is reported. NiO nanoparticles (NPs) were deposited on functionalized MWCNTs by wet impregnation method. Pd nanoparticles were formed on NiO-MWCNTs by the addition of PdCl 2 and its reduction using NaBH 4 . The Pd-NiO/MWCNTs nanocomposite then deposited on rGO support using ultrasound irradiation which led to the formation of the Pd-NiO/MWCNTs/rGO electrocatalyst. The prepared electrocatalysts were characterized by XRD, SEM, HR-TEM and XPS analysis. Electrochemical measurements demonstrate that as synthesized Pd-NiO/MWCNTs/rGO electrocatalyst exhibit higher catalytic activity (90.89 mA/cm 2 ) than either Pd/MWCNTs/rGO (43.05 mA/cm 2 ) or Pd/C (28.0 mA/cm 2 ) commercial catalyst. Chronoamperometry study of Pd-NiO/MWCNTs/rGO electrocatalyst showed long-term electrochemical stability. The enhanced catalytic activity of Pd-NiO/MWCNTs/rGO electrocatalyst for electrooxidation of ethanol can be attributed to the synergistic effect between Pd & NiO active sites.

Original languageEnglish
Pages (from-to)787-796
Number of pages10
JournalApplied Surface Science
Volume442
DOIs
StatePublished - 1 Jun 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • CVD method
  • Ethanol electro oxidation
  • Pd-NiO functionalized MWCNTs
  • Reduced GO support

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