A dendritic palladium electrode for a hydrogen peroxide sensor fabricated by electrodeposition on a dynamic hydrogen-bubble template and dealloying

Chang Yong An, Kai Zhuo, Woo Jae Kim, Chan Hwa Chung

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A dendritic Pd-Cu electrode has been prepared by co-electrodeposition of palladium and copper with high cathodic over-potentials, in which hydrogen evolution occurred. The dendritic Pd-Cu was electrochemically de-alloyed to selectively remove copper. This de-alloyed Pd-(Cu) electrode has a dramatically increased surface-area that is appropriate for electrochemical sensor applications. Electrode characteristics for use as a non-enzymatic sensor were monitored by cyclic voltammetry and amperometry, in which detection signals for hydrogen peroxide (H2O2) were precisely measured. The prepared dendritic Pd-(Cu) electrode demonstrated outstanding electrocatalytic activity for H2O2 reduction with a detection limit of 1.78 × 10-8 M, a wide dynamic range of 50 μM to 10 mM, and high sensitivity of 915.25 μA cm-2 mM-1.

Original languageEnglish
Pages (from-to)329-333
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume213
DOIs
StatePublished - 5 Jul 2015

Keywords

  • Dealloying
  • Dendritic
  • Dynamic hydrogen template
  • Electrochemical sensor
  • Hydrogen peroxide
  • Pd electrode

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