Capturing Structural Evolution and Reaction Intermediates in Co3O4 During the Electrochemical OER with Time-Resolved XAS
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https://doi.esrf.fr/10.15151/ESRF-ES-1833178814
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资源简介：
Among many Earth-abundant catalysts, Co3O4 spinels have shown great OER activity. However, the precise mechanism through which water is oxidized, and crucially, its connection to the evolution of the active site, has remained unclear. Recent results from time-resolved ATR-FTIR photolysis experiments, have suggested the presence of two mechanistic cycles that achieve O-O bond formation: a fast one occurring on electronically coupled Co(IV)=O sites, and a slow one where the Co(IV) center is isolated. Nevertheless, no direct observation of the putative Co(IV), or the Co(II/III)-OOH species has been made under operando conditions to date. Time-resolved Co K-edge XAS with the fast monochromator of ID24 will provide crucial oxidation and spin state information of the cobalt ions (XANES) as well as coordination environment information (EXAFS) in the few seconds range after an electrochemical potential bias is applied to a well-defined Co3O4 precatalyst.
提供机构：
MPI for Chemical Energy Conversion,DeBeer Group,Stiftstr. 34- 36,45470 MUELHEIM AN DER RUHR,GERMANY,45470,MUELHEIM AN DER RUHR,GERMANY; MPI fur Chemische Energiekonversion,Dept of X-ray Spectroscopy,Stiftstrasse 34 - 36,45470 MUELHEIM AN DER RUHR,GERMANY,45470,MUELHEIM AN DER RUHR,GERMANY; MPI for Chemical Energy Conversion
创建时间：
2027-01-01
