Scanning electrochemical cell microscopy platform for ultrasensitive photoelectrochemical imaging

Analytical Chemistry
Barak D B AaronsonPatrick R Unwin

Abstract

The development of techniques for nanoscale structure-activity correlations is of major importance for the fundamental understanding and rational design of (photo)electrocatalysts. However, the low conversion efficiency of characteristic materials generates tiny photoelectrochemical currents at the submicrometer to nanoscale, in the fA range, which are challenging to detect and measure accurately. Here, we report the coupling of scanning electrochemical cell microscopy (SECCM) with photoillumination, to create a submicrometer spatial resolution cell that opens up high resolution structure-(photo)activity measurements. We demonstrate the capabilities of the technique as a tool for: (i) high spatial resolution (photo)activity mapping using an ionic liquid electrolyte at a thin film of TiO2 aggregates, commonly used as a photoanode in dye sensitized solar cells (DSSCs) and (ii) in situ (photo)activity measurements of an electropolymerized conjugated polymer on a transparent Au substrate in a controlled atmospheric environment. Quantitative data, including localized (photo)electrochemical transients and external quantum efficiency (EQE), are extracted, and prospects for further technique development and enhancement are outlined.

References

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May 29, 2012·Proceedings of the National Academy of Sciences of the United States of America·Aleix G GüellPatrick R Unwin
Oct 30, 2012·Journal of the American Chemical Society·Steven E F KleijnPatrick R Unwin
Apr 9, 2013·Annual Review of Analytical Chemistry·Neil EbejerPatrick R Unwin
Jul 19, 2013·Journal of the American Chemical Society·Ashantha FernandoMario A Alpuche-Aviles
Nov 28, 2013·Nano Letters·Aleix G GüellPatrick R Unwin
Dec 12, 2013·Journal of the American Chemical Society·Paul M KirkmanPatrick R Unwin
Feb 1, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Barak D B AaronsonPatrick R Unwin
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Nov 25, 2014·Analytical Chemistry·Ding YuanDongping Zhan

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Citations

Feb 24, 2016·Analytical and Bioanalytical Chemistry·Zachary J Barton, Joaquín Rodríguez-López
Dec 3, 2015·Analytical Chemistry·Stephen M OjaBo Zhang
Oct 27, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Barak D B AaronsonPatrick R Unwin
Sep 2, 2019·The Review of Scientific Instruments·Anna E DorfiDaniel V Esposito
Sep 29, 2019·Analytical Chemistry·Je Hyun BaeMichael V Mirkin
Jan 21, 2017·Analytical Chemistry·Yasufumi TakahashiTomokazu Matsue
Nov 15, 2018·Analytical Chemistry·Jingshu HuiJoaquín Rodríguez-López

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