High selectivity of porous graphene electrodes solely due to transport and pore depletion effects

Christian Punckt, Michael A. Pope, Ilhan A. Aksay

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We contrast the performance of monolayer electrodes and thin porous film electrodes of highly reduced functionalized graphene to demonstrate that the introduction of electrode porosity gives rise to strong apparent electrocatalytic effects resulting in vastly improved electrode selectivity. This is despite graphene showing no intrinsic advantage over glassy carbon electrodes when used as a monolayer. The simultaneous electro-oxidation of ascorbic acid, dopamine, and uric acid is used as an experimental model electrolyte system. Our results suggest that a large number of reports claiming the superior surface chemistry of carbon nanomaterials as the reason for outstanding electrochemical characteristics should be revisited considering electrode morphology as a significant contributor to the observed behavior. Our experimental results are supported by numerical simulations explaining the porosity-induced electrode selectivity by the dominance of pore depletion over diffusion-limited currents.

Original languageEnglish (US)
Pages (from-to)22635-22642
Number of pages8
JournalJournal of Physical Chemistry C
Volume118
Issue number39
DOIs
StatePublished - Oct 2 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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