Simple electrodeposition of dendritic pd without supporting electrolyte and its electrocatalytic activity toward oxygen reduction and H2O2 sensing

Minkyung Kang, Yejin Yang, Jun Ho Shim, Sang Cheol Lee, Youngmi Lee, Chongmok Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Metallic palladium (Pd) electrocatalysts for oxygen reduction and hydrogen peroxide (H2O2) oxidation/reduction are prepared via electroplating on a gold metal substrate from dilute (5 to 50mM) aqueous K2PdCl4 solution. The best Pd catalyst layer possessing dendritic nanostructures is formed on the Au substrate surface from 50mM Pd precursor solution (denoted as Pd-50) without any additional salt, acid or Pd templating chemical species. The Pd-50consisted of nanostructured dendrites of polycrystalline Pd metal and micropores within the dendrites which provide high catalyst surface area and further facilitate reactant mass transport to the catalyst surface. The electrocatalytic activity of Pd-50 proved to be better than that of a commercial Pt (Pt/C) in terms of lower overpotential for the onset and half-wave potentials and a greater number of electrons (n) transferred. Furthermore, amperometric i-t curves of Pd-50 for H2O2 electrochemical reaction show high sensitivities (822.2 and -851.9μAmM-1cm-2) and low detection limits (1.1 and 7.91μM) based on H2O2 oxidation H2O2 reduction, respectively, along with a fast response (<1s).

Original languageEnglish
Pages (from-to)2691-2699
Number of pages9
JournalElectroanalysis
Volume25
Issue number12
DOIs
StatePublished - Dec 2013

Keywords

  • Dentritic palladium
  • Electrocatalysis
  • Electrodeposition
  • Hydrogen peroxide sensing
  • Oxygen reduction reaction

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