Abstract
X-ray absorption spectroscopy (XAS) has been used to monitor the local geometry of Fe and Cu sites of copper hexacyanoferrates (CuHCF)-modified electrodes which find application in the electrochemical detection of hydrogen peroxide. The XAS approach has permitted to check the nature of the Cu and Fe sites and to investigate their local structure around about 500 pm from the metal centres. The measurements have been done on electrodes prior and after the addition of known quantities of hydrogen peroxide at two different concentration ranges, following a protocol consisting of H2O2 addition, applied potential, and rest period. For the CuHCF-modified electrode, this protocol leads to the increasing conversion to an already present “inactive” component, which limits the usability of the sensor; whereas the electrode modified with the Cu2+-loaded CuHCF displays a better resistance to this unavoidable process. In particular, the formation of the “inactive” component takes place more slowly, confirming the capability, at molecular scale, of such Cu-enriched CuHCF used as electrode modifier to detect more efficiently hydrogen peroxide, as recently demonstrated in our previous paper.
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Acknowledgments
XAS measurements at ELETTRA were supported by Sincrotrone Trieste S.C.p.A. (proposal no. 20095163, “X Ray Absorption Spectroscopy Structural studies of MHCFs-based mediators for H2O2 detection”). M.G. also acknowledges the University of Bologna for RFO funding.
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Giorgetti, M., Tonelli, D., Berrettoni, M. et al. Copper hexacyanoferrate modified electrodes for hydrogen peroxide detection as studied by X-ray absorption spectroscopy. J Solid State Electrochem 18, 965–973 (2014). https://doi.org/10.1007/s10008-013-2343-5
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DOI: https://doi.org/10.1007/s10008-013-2343-5