Operando XAS study of hydrogen reaction mechanisms in novel core-shell electrocatalysts
收藏ESRF Portal2028-01-01 更新2026-04-23 收录
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https://doi.esrf.fr/10.15151/ESRF-ES-2116855101
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As a continuation of the work on verifying operando XAS fuel cell utilizing Pd@CeOx catalysts, we propose an operando XAS measurement of another core-shell Pd@TiOx material on Vulcan carbon as a hydrogen oxidation reaction (HOR) catalyst in fuel cells. Compared to bare Pd nanoparticles, the Pd@TiOx catalysts exhibit superior HOR performance in alkaline media. Further investigations indicate that the introduction of a TiOx shell onto Pd nanoparticles leads to a higher CO stripping area, indicating that TiOx shell promotes CO adsorbing and oxidation. Interestingly, this phenomenon does not occur on the Pd@CeOx catalysts where, contrary, a blocking effect is observed. These observations suggest that the Pd@TiOx catalysts may have different reaction mechanism compared to Pd@CeOx. To illustrate the reaction mechanism on Pd@TiOx, we will use Pd K- and Ti K-edges XANES and EXAFS at ID26 or ID24-DCM, in an electrochemical flow cell.
提供机构：
University of Helsinki, Department of Physical Sciences, P.O.Box 64, 00014 Helsinki, Finland; Aalto University, Electrochemical Energy Conversion Group, Department of Chemistry and Materials Science, P.o. Box 16100, 02150 Espoo, Finland; Aalto University, Electrochemical Energy Conversion Group, Department of Chemistry and Materials Science P.O. Box 16100, 02150, Espoo, FINLAND; University of Helsinki, Department of Physical Sciences, P.O.Box 64, 00014, Helsinki, FINLAND; University of Helsinki, Division of X-Ray Physics, P.O.Box 64, 00014 Helsinki, Finland
创建时间：
2028-01-01
