Surface structure and reactivity of
multi-component oxides at the atomic scale

Subproject P02

Multi-component metal oxides exhibit a plethora of stoichiometry-dependent structural phases at the surface, even if the composition of the bulk is kept the same. The long-term objective of P02 is to unravel the relationship between surface electronic and geometric structure and reactivity, to ultimately tune these materials for energy-related reactions such as the ORR. The project applies the surface science approach. We will grow well-defined, epitaxial perovskite thin films of LSFO and LSMO in a UHV-based PLD/surface science apparatus under tight control of the surface stoichiometry in the first project period. We will determine the coordinates of surface atoms quantitatively using LEED-IV in close collaboration with theoretical groups.

Theoretical models will also help with interpreting atomically-resolved ncAFM/STM images. These images give direct insights into the behavior of polarons in these complex materials and show how adsorbates such as O2, H2O, CO, and CO2 interact with electronic and structural defects. XPS, TPD, and FTIR of these well-defined systems will deliver desorption energies, vibrational frequencies, and spectral fingerprints. These experimental data on well-defined systems will build a bridge when tested under ‘realistic’ environments at high pressure/temperature and in aqueous solutions. They will also serve to validate ML-based theory approaches.

Ulrike Diebold
PI

Expertise

Our expertise is experimental surface science. We operate a total of seven ultrahigh-vacuum (UHV) chambers, which contain virtually all main experimental surface science techniques, as well as an (electro-)chemistry lab.

All chambers are equipped with facilities for sample preparation (sputtering/annealing/gas dosing), as well as various growth techniques (e-beam evaporators, Knudsen cells, UHV-compatible sputter deposition, pulsed laser deposition (PLD)).

Analysis techniques used in our research include:

  • Scanning Tunneling Microscopy (STM) (in UHV 4K – 300 K, electrochemical STM)
  • Atomic Force Microscopy (AFM): UHV-based (q+ sensor) and in the ambient (cantilever-based)
  • Low-Energy Electron Diffraction (LEED)
  • Reflection High Energy Diffraction (RHEED)
  • X-ray Photoelectron Spectroscopy (XPS)
  • Ultraviolet Photoelectron Spectroscopy (UPS)
  • Auger Electron Spectroscopy (AES)
  • Low-energy He+ ion scattering (LEIS)
  • Thermal Programmed Desorption Spectroscopy (TPD)

Of particular use for TACO is our combined Pulsed-Laser Deposition/Surface Science setup shown on the right-hand side. It allows the growth of multi-component metal oxides and the investigations of surface properties within the same UHV setup.

Team

Ulrike Diebold
PI

Michele Riva
co-PI

Michael Schmid
co-PI

Alexander Michael Imre
PhD Student

Erik Rheinfrank
PhD Student

Michael Brunthaler
Master Student

Florian Dörr
Master Student

Publications

Show all

19 entries « 1 of 2 »

2021

LiOx-modification of Ni and Co3O4 surfaces: An XPS, LEIS and LEED study

Haunold, Thomas; Rupprechter, Günther

LiOx-modification of Ni and Co3O4 surfaces: An XPS, LEIS and LEED study Journal Article

In: Surface Science, 713 , pp. 121915, 2021.

Abstract | Links | BibTeX | Tags: P08

Single-Particle Catalysis: Revealing Intraparticle Pacemakers in Catalytic H2 Oxidation on Rh

Zeininger, Johannes; Suchorski, Yuri; Raab, Maximilian; Buhr, Sebastian; Grönbeck, Henrik; Rupprechter, Günther

Single-Particle Catalysis: Revealing Intraparticle Pacemakers in Catalytic H2 Oxidation on Rh Journal Article

In: ACS Catalysis, 11 (15), pp. 10020–10027, 2021.

Abstract | Links | BibTeX | Tags: P08, TACO-associated

Emerging applications of MXene materials in CO2 photocatalysis

Shen, Jiahui; Wu, Zhiyi; Li, Chaoran; Zhang, Chengcheng; Genest, Alexander; Rupprechter, Günther; He, Le

Emerging applications of MXene materials in CO2 photocatalysis Journal Article

In: FlatChem, 28 , pp. 100252, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

Resolving multifrequential oscillations and nanoscale interfacet communication in single-particle catalysis

Suchorski, Yuri; Zeininger, Johannes; Buhr, Sebastian; Raab, Maximilian; Stöger-Pollach, Michael; Bernardi, Johannes; Grönbeck, Henrik; Rupprechter, Günther

Resolving multifrequential oscillations and nanoscale interfacet communication in single-particle catalysis Journal Article

In: Science, 372 (6548), pp. 1314–1318, 2021.

Links | BibTeX | Tags: P08, pre-TACO

Co3O4-CeO2 Nanocomposites for Low-Temperature CO Oxidation

Yang, Jingxia; Yigit, Nevzat; Möller, Jury; Rupprechter, Günther

Co3O4-CeO2 Nanocomposites for Low-Temperature CO Oxidation Journal Article

In: Chemistry A European Journal, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

Direct CO2 capture and conversion to fuels on magnesium nanoparticles under ambient conditions simply using water

Rawool, Sushma A; Belgamwar, Rajesh; Jana, Rajkumar; Maity, Ayan; Bhumla, Ankit; Yigit, Nevzat; Datta, Ayan; Rupprechter, Günther; Polshettiwar, Vivek

Direct CO2 capture and conversion to fuels on magnesium nanoparticles under ambient conditions simply using water Journal Article

In: Chemical Science, 12 (16), pp. 5774–5786, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

Operando Surface Spectroscopy and Microscopy during Catalytic Reactions: From Clusters via Nanoparticles to Meso-Scale Aggregates

Rupprechter, Günther

Operando Surface Spectroscopy and Microscopy during Catalytic Reactions: From Clusters via Nanoparticles to Meso-Scale Aggregates Journal Article

In: Small, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

How the anisotropy of surface oxide formation influences the transient activity of a surface reaction

Winkler, Philipp; Zeininger, Johannes; Suchorski, Yuri; Stöger-Pollach, Michael; Zeller, Patrick; Amati, Matteo; Gregoratti, Luca; Rupprechter, Günther

How the anisotropy of surface oxide formation influences the transient activity of a surface reaction Journal Article

In: Nature Communications, 12 (1), 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

Sum frequency generation spectroscopy in heterogeneous model catalysis: a minireview of CO-related processes

Li, Xia; Rupprechter, Günther

Sum frequency generation spectroscopy in heterogeneous model catalysis: a minireview of CO-related processes Journal Article

In: Catalysis Science & Technology, 11 (1), pp. 12–26, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

2020

Interplay between CO Disproportionation and Oxidation: On the Origin of the CO Reaction Onset on Atomic Layer Deposition-Grown Pt/ZrO2 Model Catalysts

Pramhaas, Verena; Roiaz, Matteo; Bosio, Noemi; Corva, Manuel; Rameshan, Christoph; Vesselli, Erik; Grönbeck, Henrik; Rupprechter, Günther

Interplay between CO Disproportionation and Oxidation: On the Origin of the CO Reaction Onset on Atomic Layer Deposition-Grown Pt/ZrO2 Model Catalysts Journal Article

In: ACS Catalysis, 11 (1), pp. 208–214, 2020.

Abstract | Links | BibTeX | Tags: P08, P10, pre-TACO

19 entries « 1 of 2 »