Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 49: Poster Nanostructures at Surfaces
O 49.3: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Hydroxyl Groups on Different Metal Doped Co3O4 Particle Catalysts Observed by Sum Frequency Generation Vibrational Spectroscopy — •Furong Yan1, Carsten Placke-Yan2, Zhipeng Huang1, Yujin Tong1, and R. Kramer Campen1 — 1Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen — 2Faculty of Chemistry and Institute of Inorganic Chemistry, University of Duisburg-Essen
Metal-doped Co3O4 nanoparticles are promising catalysts for the electrochemical oxygen evolution reaction (OER), with surface Co-OH groups playing a critical role in the water oxidation cycle. However, the influence of metal doping on the behavior of surface OH groups and its subsequent effect on OER activity remains uncertain.
Here, we investigate the effects of metal doping (Mn and V) on the bonding of OH groups using sum frequency generation (SFG) vibrational spectroscopy. Our results reveal that Mn-doped Co3O4 exhibits stronger bonding between OH groups and the surface compared to both pristine Co3O4 and V-doped Co3O4 , leading to a reduction in OER activity. We propose two mechanisms: (1) an excess of OH groups can block active sites and increase charge transfer resistance, and (2) the stronger Co-OH bonds in Mn-doped Co3O4 may hinder the cleavage of Co-OH bonds, thereby impeding the OER process. These findings provide valuable insights into how surface interactions with OH groups can be tailored to optimize OER catalytic performance.
Keywords: Cobalt nanoparticles; Surface hydroxyl; SFG; OER activity