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Redox state and photoreduction control using X-ray spectroelectrochemical techniques – advances in design and fabrication through additive engineering

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journal contribution
posted on 25.02.2021, 16:30 by Stephen Peter Best, Victor A Streltsov, Christopher Thomas Chantler, Wangzhe Li, Philip A Ash, Shusaku Hayama, Sofia Diaz-Moreno
The design and performance of an electrochemical cell and solution flow system optimized for the collection of X-ray absorption spectra from solutions of species sensitive to photodamage is described. A combination of 3D CAD and 3D printing techniques facilitates highly optimized design with low unit cost and short production time. Precise control of the solution flow is critical to both minimizing the volume of solution needed and minimizing the photodamage that occurs during data acquisition. The details of an integrated four-syringe stepper-motor-driven pump and associated software are described. It is shown that combined electrochemical and flow control can allow repeated measurement of a defined volume of solution, 100 µl, of samples sensitive to photoreduction without significant change to the X-ray absorption near-edge structure and is demonstrated by measurements of copper(II) complexes. The flow in situ electrochemical cell allows the collection of high-quality X-ray spectral measurements both in the near-edge region and over an extended energy region as is needed for structural analysis from solution samples. This approach provides control over photodamage at a level at least comparable with that achieved using cryogenic techniques and at the same time eliminates problems associated with interference due to Bragg peaks.

History

Citation

J. Synchrotron Rad. (2021). 28, 472-479 https://doi.org/10.1107/S1600577520016021

Author affiliation

Department of Chemistry

Version

AM (Accepted Manuscript)

Published in

Journal of Synchrotron Radiation

Volume

28

Issue

2

Pagination

472-479

Publisher

International Union of Crystallography (IUCr)

eissn

1600-5775

Copyright date

2021

Available date

01/03/2021

Language

en