Electrocatalytic Reaction Induced Colloidal Accumulation: The Role of Dielectrophoresis

Abimbola A. Ashaju, Jeffery A. Wood, Rob G. H. Lammertink*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

A surface-driven flow is generated during the electrocatalytic reaction of a platinum–gold bielectrode within hydrogen peroxide. This flow can be experimentally visualized and quantified using micrometer-sized particles that are transported by a flow field. Tracer particles, which possess an inherent surface charge, also interact with the induced electric field and exhibit a collective behavior at the surface of the electrodes where they accumulate. The underlying mechanism for the accumulation dynamics demonstrated by these catalytic pump systems has so far been lacking. In this work, the accumulation dynamics and kinetics were experimentally investigated. With use of numerical simulations, we demonstrate that the self-driven particle accumulation is controlled by a positive dielectrophoretic force, mediated by the reaction-induced electric and flow field. These results contribute to the fundamental knowledge on immobilized bimetallic systems.
Original languageEnglish
Pages (from-to)3040-3050
Number of pages11
JournalLangmuir
Volume38
Issue number10
Early online date1 Mar 2022
DOIs
Publication statusPublished - 15 Mar 2022

Keywords

  • UT-Hybrid-D

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