Enhanced electrocatalytic effects of Pd particles immobilized on GC surface on the nitrite oxidation reactions

Md Saiful Alam, Md Fazle Shabik, Mohammed M. Rahman, Manel del Valle, Mohammad A. Hasnat

    Research output: Contribution to journalArticleResearch

    5 Citations (Scopus)

    Abstract

    © 2019 Elsevier B.V. Nitrite (NO 2− ) oxidation reactions (NOR) have been performed using a pristine glassy carbon (GC) electrode and Pd modified GC electrode to investigate catalysis and kinetics of oxidation reaction. The XPS analysis revealed that Pd nanoparticles (NPs) on GC is differed electronically from Pd particles alone. Electrochemical observations entailed that the Pd-GC electrode improved the catalytic efficiency by lowering peak potential and improving peak current compared to those obtained by GC or Pd electrode alone. Additionally, the onset potential (E i ) of kinetic process concerning NOR was appeared at 0.63 V for Pd-GC electrode which is smaller than 0.81 V and 0.75 V observed by GC and Pd electrodes, respectively. These observations suggest that the Pd–GC electrode can obtain faster electron transfer and maximum catalytic sites. The validation of Pd-GC as noble catalyst is also supported by observing least free energy of activation at peak (ΔG p‡ = 0.461 eV). The nitrite ions involve a single electron transfer reaction with NO 2 molecules being the product, which later undergoes through a dispropornation reaction yielding NO 2− and NO 3− as final products. The precise observations by RDE experiments revealed that the charge transfer reaction followed by an irreversible first order kinetics with standard rate constant (k 0 ) of 1.98 × 10 −4 cm/s and formal potential (E o ′ ) of 0.03 V.
    Original languageEnglish
    Pages (from-to)1-8
    JournalJournal of Electroanalytical Chemistry
    Volume839
    DOIs
    Publication statusPublished - 15 Apr 2019

    Keywords

    • Catalysis
    • Charge transfer
    • Kinetics
    • Oxidation reactions
    • Pd-Pt catalyst

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