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UID:MEC-4396bb279cab5e7ef29ead3a46cf3649@inma.unizar-csic.es
DTSTART:20251128T110000Z
DTEND:20251128T120000Z
DTSTAMP:20251119T135000Z
CREATED:20251119
LAST-MODIFIED:20251126
SUMMARY:INMA Seminar (28th Nov.): Dandan Gao, from the Johannes Gutenberg University (Mainz, Germany)
DESCRIPTION:Conference: «Synergistic behavior in water electrolysis catalysed by Co-W-Cu mixed metal oxides»\nEvent details\n\nSpeaker: Dr Dandan Gao, from the Johannes Gutenberg University (Mainz, Germany).\nDate: 28th November 2025.\nTime: 12:00.\nLocation: Sala de Conferencias, Edificio I+D+i, Campus Río Ebro.\n\nPresentation summary\nThe conference, titled «Synergistic behavior in water electrolysis catalyzed by Co-W-Cu mixed metal oxides» will focus on the development of promising electrocatalysts for water splitting.\nDr. Gao investigates transition-metal oxides, such as Ni, Cu, and Co oxides, which are attractive due to their low cost, abundance, and tunable valence. A major challenge addressed is their stable anchoring to electrodes.\nThe presentation will cover research on the in-situ growth of mixed Co–W–Cu oxide bifunctional catalysts. These catalysts are characterised by their high conductivity, nanostructured morphology, chemical tunability, and excellent long-term stability for both the Hydrogen Evolution Reaction (HER) and the Oxygen Evolution Reaction (OER). The objective is to enable a full water-splitting cell using the identical material at both the anode and cathode.\nKey aspects and mechanistic findings:\n\nA growth model for high-surface-area nanowires will be detailed, along with electrochemical testing, mechanistic analysis, and stability studies.\nThe studies reveal strong metal-oxide synergy. In-situ synchrotron XAS identifies Co3+ as the active site for OER, Cu0 as the active site for HER, and $\text{W}^{6+}$ as the species that stabilises the structure.\nThe research also reports self-assembled Co–W oxide nanostructures on $\text{CuO}$, formed via a single-step deposition process. This composite demonstrates self-optimisation for OER, leading to lower overpotentials, higher currents, greater active surface area, and enhanced conductivity and wettability. In-situ restructuring identifies oxidised cobalt species as the true OER site.\nDFT studies (Density Functional Theory) indicate that OOH∗ formation is the rate-determining step and reveal a shift in oxygen-intermediate binding from W to Co during OER.\n\n \nAnnouncing poster\nAbstract\n
URL:https://inma.unizar-csic.es/en/agenda-eventos/inma-seminar-28th-nov-dandan-gao-from-the-johannes-gutenberg-university-mainz-germany/
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