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Issue 1, 2014
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Redox cycling in nanoporous electrochemical devices

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Nanoscale redox cycling is a powerful technique for detecting electrochemically active molecules, based on fast repetitive oxidation and reduction reactions. An ideal implementation of redox cycling sensors can be realized by nanoporous dual-electrode systems in easily accessible and scalable geometries. Here, we introduce a multi-electrode array device with highly efficient nanoporous redox cycling sensors. Each of the sensors holds up to 209 000 well defined nanopores with minimal pore radii of less than 40 nm and an electrode separation of ∼100 nm. We demonstrate the efficiency of the nanopore array by screening a large concentration range over three orders of magnitude with area-specific sensitivities of up to 81.0 mA (cm−2 mM−1) for the redox-active probe ferrocene dimethanol. Furthermore, due to the specific geometry of the material, reaction kinetics has a unique potential-dependent impact on the signal characteristics. As a result, redox cycling experiments in the nanoporous structure allow studies on heterogeneous electron transfer reactions revealing a surprisingly asymmetric transfer coefficient.

Graphical abstract: Redox cycling in nanoporous electrochemical devices

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Publication details

The article was received on 24 Jul 2013, accepted on 25 Oct 2013 and first published on 29 Oct 2013

Article type: Paper
DOI: 10.1039/C3NR03818A
Citation: Nanoscale, 2014,6, 589-598
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    Redox cycling in nanoporous electrochemical devices

    M. Hüske, R. Stockmann, A. Offenhäusser and B. Wolfrum, Nanoscale, 2014, 6, 589
    DOI: 10.1039/C3NR03818A

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