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Operando diffuse reflectance UV-vis spectroelectrochemistry for investigating oxygen evolution electrocatalysts

Sebastian Wahl,   Sayed El-Refaei,   P Amsalem,   Ana Guilherme Buzanich,   Norbert Koch  and  Nicola Pinna  

Abstract

The characterization of the active structure of water splitting catalysts is crucial to evolve to a sustainable energy future based on hydrogen. Such an information can only be obtained by operando methods. We present a diffuse reflectance UV-Vis (DRUV) spectroelectrochemical study that allows to track the changes of solid oxygen evolution catalysts under working conditions. The versatility of our approach is demonstrated on two cobalt-containing catalysts Zn0.35Co0.65O and CoAl2O4. The changes the catalysts undergo during the oxygen evolution reaction can be tracked by probing the electronic structure by UV-Vis spectroscopy. These findings are compared to ex situ analyses, which support the assignments of the structures stabilized under different potentials. Thus, structure-activity correlations can be proposed, and deeper insights into the catalytically active structures can be obtained.

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Publication details

The article was accepted on 01 Dec 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9CY02329A
Catal. Sci. Technol., 2019, Accepted Manuscript

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    Operando diffuse reflectance UV-vis spectroelectrochemistry for investigating oxygen evolution electrocatalysts

    S. Wahl, S. El-Refaei, P. Amsalem, A. G. Buzanich, N. Koch and N. Pinna, Catal. Sci. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C9CY02329A

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