Aaronson, Barak D. B., Byers, Joshua C., Colburn, Alex W., McKelvey, Kim M. (Kim Martin) and Unwin, Patrick R. (2015) Scanning electrochemical cell microscopy platform for ultrasensitive photoelectrochemical imaging. Analytical Chemistry, 87 (8). pp. 4129-4133. doi:10.1021/acs.analchem.5b00288

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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.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH):	Photoelectrochemistry, Photoelectron spectroscopy, Image processing
Journal or Publication Title:	Analytical Chemistry
Publisher:	American Chemical Society
ISSN:	0003-2700
Official Date:	22 March 2015
Dates:	Date Event 22 March 2015 Published 6 April 2105 Available 22 March 2015 Accepted 22 January 2015 Submitted
Date of first compliant deposit:	29 December 2015
Volume:	87
Number:	8
Number of Pages:	5
Page Range:	pp. 4129-4133
DOI:	10.1021/acs.analchem.5b00288
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Research Council (ERC), Seventh Framework Programme (European Commission) (FP7)
Grant number:	ERC-2009-AdG 247143-QUANTIF (ERC), FP7/2007-2013 329953 (FP7)

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