Liquid Phase Electron Microscopy

Liquid Phase Electron Microscopy

Our research aims to derive critical structure-property relationships that control the performance of nanoscale electrocatalysts through in situ characterization with electron microscopy and its associated spectroscopic techniques. In particular, we are interested in operando studies where the imaging of catalysts in liquid environments is coupled with concurrent measurements of their reaction kinetics.

This approach will allow us to directly interrogate the structure and composition of these catalysts under reaction conditions and generate insights that can be used to inform the rational design of these nanomaterials. Other areas of interest of the group include: (1) automated image processing of high frame count electron microscope image sequences, (2) advanced image analysis of low quality images acquired at low electron fluences, and (3) the development of multi-modal approaches towards catalyst characterization using methods complementary to electron microscopy.


Group Members

Dr. Aram Yoon Fengli Yang

Dr. Stefanie Kühl


FHI Electron Microscopy Facility

Wiebke Frandsen


Recent Publications

H. Jeon, J. Timoshenko, C. Rettenmaier, A. Herzog, A. Yoon, S.W. Chee, S. Oener, U. Hejral, F. Haase and B. Roldan Cuenya: Selectivity control of Cu nanocrystals in a gas-fed flow cell through CO2 pulsed electroreduction. Journal of the American Chemical Society 143 (19), 7578–7587 (2021).
M. Lopez-Luna, J. Timoshenko, D. Kordus, C. Rettenmaier, S.W. Chee, A.S. Hoffman, S.R. Bare, S.K. Shaikhutdinov and B. Roldan Cuenya: Role of the Oxide Support on the Structural and Chemical Evolution of Fe Catalysts during the Hydrogenation of CO2. ACS Catalysis 11, 6175–6185 (2021).
S.W. Chee, T. Lunkenbein, R. Schlögl and B. Roldan Cuenya: In situ and operando electron microscopy in heterogeneous catalysis – insights into multi-scale chemical dynamics. Journal of Physics: Condensed Matter 33 (15), 153001 (2021).
N.J. Divins, D. Kordus, J. Timoshenko, I. Sinev, I. Zegkinoglou, A. Bergmann, S.W. Chee, S. Widrinna, O. Karslıoğlu, H. Mistry, M. Lopez Luna, J.Q. Zhong, A.S. Hoffmann, A. Boubnov, J.A. Boscoboinik, M. Heggen, R.E. Dunin-Borkowski, S.R. Bare and B. Roldan Cuenya: Operando high-pressure investigation of size-controlled CuZn catalysts for the methanol synthesis reaction. Nature Communications 12, 1435 (2021).
A. Yoon, A. Herzog, P. Grosse, D.H. Alsem, S.W. Chee and B. Roldan Cuenya: Dynamic Imaging of Nanostructures in an Electrolyte with a Scanning Electron Microscope. Microscopy and Microanalysis 27 (1), 121–128 (2021).
C. Rettenmaier, R. Aran Ais, J. Timoshenko, R. Rizo, H. Jeon, S. Kühl, S.W. Chee, A. Bergmann and B. Roldan Cuenya: Enhanced Formic Acid Oxidation over SnO2-decorated Pd Nanocubes. ACS Catalysis 10 (24), 14540–14551 (2020).
P. Grosse, A. Yoon, C. Rettenmaier, S.W. Chee and B. Roldan Cuenya: Growth Dynamics and Processes Governing the Stability of Electrodeposited Size-Controlled Cubic Cu Catalysts. The Journal of Physical Chemistry C 124 (49), 26908–26915 (2020).
S. Kunze, P. Grosse, M.B. Lopez, I. Sinev, I. Zegkinoglou, H. Mistry, J. Timoshenko, M.Y. Hu, J. Zhao, E.E. Alp, S.W. Chee and B. Roldan Cuenya: Operando NRIXS and XAFS Investigation of Segregation Phenomena in Fe‐Cu and Fe‐Ag Nanoparticle Catalysts during CO2 Electroreduction. Angewandte Chemie International Edition 59 (50), 22667–22674 (2020).
R. Aran Ais, R. Rizo, P. Grosse, G. Algara-Siller, K. Dembélé, M. Plodinec, T. Lunkenbein, S.W. Chee and B. Roldan Cuenya: Imaging electrochemically synthesized Cu2O cubes and their morphological evolution under conditions relevant to CO2 electroreduction. Nature Communications 11, 3489 (2020).


Chee, S. W.: Revealing the Dynamics of Electrocatalysts Under Reaction Conditions Using Liquid Phase Electron Microscopy. 3rd International Symposium on Advanced Microscopy and Spectroscopy, Online Event (2020)
Chee, S. W.: Capturing the Dynamic Evolution of Electrocatalysts Under Reaction Conditions With Liquid Phase Electron Microscopy. Conference Electrochemistry undercover, Online Event (2020)
Chee, S. W.: Investigating the Behavior of CU-Based Catalysts During Electrochemical CO2 Reduction With Liquid Cell Electron Microscopy. Microscopy & Microanalysis 2020 Meeting, Online Event (2020)
Chee, S. W.: Seeing Catalysts in Action: Opportunities and Challenges With Environmental Cell Electron Microscopy. SEEN 2020: Solutions for Environmental Nanoscopy , Lyon, France (2020)
Chee, S. W.: Direct Observations of Morphology Changes in Copper Nanoparticles During Electrochemical Cycling Using Liquid Cell TEM. 8th Science Day of the Max Planck-EPFL Center for Molecular Nanoscience & Technology, Lausanne, Switzerland (2019)
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