2026-06-01T00:03:28Z https://icatplus.esrf.fr/oaipmh/request

oai:icatplus.esrf.fr:inv/2116855101 2025-06-02T06:01:16.750Z

4.2 EI 10.15151/ESRF-ES-2116855101 Antti-Jussi KALLIO Antti-Jussi Kallio VASYL MARCHUK Vasyl Marchuk 0000-0002-5169-1943 Antti-Jussi KALLIO Antti-Jussi Kallio Jefina KOIVUNIEMI Jefina Koivuniemi Jefina KOIVUNIEMI Jefina Koivuniemi Benjin JIN Benjin Jin 0009-0005-2043-9453 Benjin JIN Benjin Jin 0009-0005-2043-9453 SIMO HUOTARI Simo Huotari 0000-0003-4506-8722 SIMO HUOTARI Simo Huotari 0000-0003-4506-8722 Tanja KALLIO Tanja Kallio 0000-0001-6671-8582 Tanja KALLIO Tanja Kallio 0000-0001-6671-8582 Example Institute 2028 Data from large facility measurement 2025-05-23T06:00:00Z/2025-06-02T06:00:00Z 2025-06-02T06:00:00Z I CC-BY-4.0 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.