Prof. Ulrich Stimming 教授访问E01小组

Wed, 11/19/2014 - 10:00


Scanning Probe Microscopies (SPM) have given the opportunity to investigate surfaces and its adsorbates with unprecedented resolution. This applies in particular to the solid-liquid interface and, specifically, under in-situ electrochemical conditions. ElectroChemicalScanning Tunnelling Microscopy (EC-STM) and more recently Scanning ElectroChemicalPotential Microscopy (SECPM) can be used to investigate potential dependent phenomena on surfaces, with SECPM specifically for biological structures. Two major areas will be shown: One, where metal particles were deposited on typically Au(111) surfaces and the reactivity of e.g. Pd and Pt particles were investigated regarding the hydrogen reaction. This includes creating single nanoparticles with the tip of an EC-STM whereas the tip was also used as a local sensor to determine the reactivity of the single particles[1-3]. Specific reactivity can change by orders of magnitude depending on the density of particles, their size and the kind of substrate. The second area looks at biological structures, specifically enzyme molecules adsorbed on carbon or Au(111) surfaces. Here EC-STM and SECPM are being employed and their respective capabilities are shown. Charge transfer processes through the enzyme molecule can be studied using EC-STM. Imaging the molecules SECPM shows a much higher resolution and contrast than EC-STM [4-6].
Both research areas demonstrate the large capability of SPM under in-situ and physiological conditions.

[1] H. Wolfschmidt, D. Weingarth, and U. Stimming, ChemPhysChem,11, (2010) 1533.
[2] J. Meier, J. Schiotz, P. Liu, J. K. Nørskov, and U. Stimming, Chem. Phys. Lett.,390, (2004) 440.
[3] M. Eikerling, J. Meier, and U. Stimming, Z. Phys. Chem. (Int. Ed.),217, (2003) 395.
[4] C. Baier and U.Stimminge, Angewandte Chem.Int.Ed. 48 (2009) 5542.
[5] H.Wolfschmidt, C.Baier, S.Gsell, M.Fischer, M.Schreck, U.Stimming, Materials 3 (2010) 4196.
[6] C.Baier, H.Sternschulte, A.Denisenko, A.Schlichtiger, U.Stimming, NATO Science for Peace and Security, Series B: Physics and Biophysics, 2011, 471.

Ulrich Stimming is currently Professor of Chemistry and Head of School of Chemistry at Newcastle University. He was a Chair of Physics at Technical University of Munich (TUM). He received his Diploma in Chemistry and Ph.D. in Physical Chemistry from Free University of Berlin, Germany. He was Scientific Advisor and Principal Investigator of TUM Create. He is the founder and Editor-in-chief of the scientific journal “Fuel Cells-From Fundamentals to Systems”, VCH-Wiley. He is a member of various national and international academic advisory committees and served on evaluation panels of the European Research Council (ERC). He also coordinated for the Association of Leading Technical Universities in Germany (TU9) a research network of a total of 8 universities in electromobility between Germany and China, and was co-director of the Joint “Institute for Advanced Power Sources” of TUM and Tsinghua University from 2010-2014. He holds 12 patents, approx. 300 publications in scientific journals and books (h index 50+). Dr. Stimming is a fellow of the International Society of Electrochemistry (I.S.E.)) and was the winner of ElectrochimicaActa Gold Medal (I.S.E. 2010) and Hellmuth Fischer Medal, By DECHEMA, Germany (2010).





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