Electrocatalytic performance of Ni@Pt core–shell nanoparticles supported on carbon nanotubes for methanol oxidation reaction

Shahid Ali, Ibrahim Khan, Safyan Akram Khan, Manzar Sohail, Riaz Ahmed, Ateeq ur Rehman, Muhammad Shahid Ansari, Mohamed Ali Morsy

Research output: Journal PublicationArticlepeer-review

75 Citations (Scopus)

Abstract

Ni@Pt (Ni-core, Pt-shell) nanoparticles deposited on surface of functionalized multi-walled carbon nanotubes (MWCNTs) have been prepared by a modified chemical co-reduction protocol and tested as promising electrocatalyst for methanol oxidation reaction (MOR). To delve comparison, Pt–Ni/MWCNTs (mixed structure) and Pt/MWCNTs have also been synthesized via conventional co-reduction method. Scanning electron microscopy (SEM) image demonstrates the open-ends of functionalized MWCNTs. Transmission electron microscopy (TEM) image indicates the presence of 5.7 ± 0.9 nm sized well-dispersed Ni@Pt core–shell particles on MWCNTs surface. Z-contrast images have been recorded via scanning transmission electron microscopy (STEM) using high-angle annular dark-field (HAADF) and annular bright-field (ABF) mode, which confirms the formation of core–shell nanostructures. Cyclic voltammetry results show that mass activities (MA) exhibited by Ni@Pt/MWCNTs (216.7 mA·mg− 1Pt) for MOR in acidic medium are 2.25 and 1.47 times greater than those of Pt/MWCNTs (96.3 mA·mg− 1Pt) and Pt–Ni/MWCNTs (147.9 mA·mg− 1Pt) catalysts respectively. A pretty much similar comparison has been observed for MOR in basic medium. Moreover, chronoamperometric curves shows that Ni@Pt/MWCNTs has substantially better performance as compared to the other electrocatalysts in both acidic and alkaline media.

Original languageEnglish
Pages (from-to)17-25
Number of pages9
JournalJournal of Electroanalytical Chemistry
Volume795
DOIs
Publication statusPublished - 15 Jun 2017
Externally publishedYes

Keywords

  • Core–shell
  • Cyclic voltammetry
  • Direct methanol fuel cells
  • Methanol oxidation
  • Multi-walled carbon nanotubes

ASJC Scopus subject areas

  • Analytical Chemistry
  • General Chemical Engineering
  • Electrochemistry

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