Abstract
The structural evolution of three electrocatalytic systems for hydrogen evolution reaction using iron, cobalt, and ruthenium(II) clathrochelate complexes as catalysts in a water electrolyzer is studied by X-ray absorption near-edge structure (XANES)/extended X-ray absorption fine structure (EXAFS) spectroscopy. The complexes are shown to display essentially different robustness under water electrolysis conditions in pilot-scale hydrogen generators. The iron and cobalt(II) clathrochelates preserve their cage, macrobicyclic structure, and the encapsulated metal(II) ion is reduced to metal(I) cation; whereas in the case of ruthenium(II) clathrochelate, the cage complex undergoes partial decomposition to form sulfur-containing products of decomposition of the encapsulating macrobicyclic hexasulfide ligand, which results in the accumulation of the ruthenium disulfide RuS2 in used clathrochelate-containing cathode material. Taking into account our experimental data on the chemical transformation of clathrochelate electrocatalysts under the conditions of 2Н+/Н2 reaction, we discuss the possibilities for boosting the efficiency of electrocatalytic systems based on this class of coordination compounds.
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Funding
The work was supported by the Russian Science Foundation within project no. 17-13-01468 (the syntheses of cage complexes); the Russian Foundation for Basic Research within grant no. 18-29-23007 (electrocatalysis experiments; Ya.Z. Voloshin), grant no. 19-58-26022 (investigations of membrane-electrode assemblies of water electrolyzer; S.A. Grigor’ev and A.S. Pushkarev); and with partial support from the Ministry of Education and Science, Russian Federation (project AAAA-A19-119020890025-3; quantitative analysis of XANES and EXAFS spectra by Ya.V. Zubavichus). Adsorption studies were carried out within a state assignment to the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, in the area of fundamental scientific research.
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Zubavichus, Y.V., Grigor’ev, S.A., Pushkarev, A.S. et al. Structural and Chemical Transformations of Ruthenium, Cobalt, and Iron Clathrochelates Used as Electrocatalysts for a Hydrogen Evolution Reaction in a Water Electrolyzer. Nanotechnol Russia 15, 341–349 (2020). https://doi.org/10.1134/S1995078020030179
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DOI: https://doi.org/10.1134/S1995078020030179