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High Selectivity of Porous Graphene Electrodes Solely Due to Transport and Pore Depletion Effects

Author(s): Punckt, Christian; Pope, Michael A.; Aksay, Ilhan A.

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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.
Publication Date: 2014
Electronic Publication Date: Sep-2014
Citation: Punckt, C, Pope, MA, Aksay, IA. (2014). High Selectivity of Porous Graphene Electrodes Solely Due to Transport and Pore Depletion Effects. Journal of Physical Chemistry C, 118 (22635 - 22642). doi:10.1021/jp507238u
DOI: doi:10.1021/jp507238u
Pages: 22635 - 22642
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Physical Chemistry C
Version: Author's manuscript

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