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.
S.W. Chee and B. Roldan Cuenya: 2022 Roadmap on Low Temperature Electrochemical CO2 Reduction: Mechanistic insight into the electrocatalytic reduction of CO2 via operando spectroscopy and microscopy methods. Journal of Physics: Energy4 (4), 042003 (2022).
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 Edition59 (50), 22667–22674 (2020).
S.W. Chee, A. Yoon, F. Yang, P. Grosse, J. Poon and B. Roldan Cuenya: Understanding Structure-Property Relationships in Nanoparticle Electrocatalysts through Correlated Electron Microscopies. Microscopy and Microanalysis27 (S1), 52–53 (2021).
Chee, S. W.: Probing the Complex Restructuring of Electrocatalysts Under Reaction Conditions Using Electrochemical Cell Transmission Electron Microscopy. Virtual Vacuum Congress 2021, Online Event (2021)
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.: 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)