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Scanning electrochemical cell microscopy platform for ultrasensitive photoelectrochemical imaging
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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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WRAP_1050272-ch-280515-unwin_manuscript.pdf - Accepted Version - Requires a PDF viewer. Download (1002Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/acs.analchem.5b00288
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 | ||||||||||
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| 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: |
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| 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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