We have applied the advanced scanning transmission electron microscopy and spectroscopy techniques to characterize catalysts, oxide thin film, materials for super-capacitors and electrode materials for Li-ion battery. In addition to the structural information, we are able to achieve the chemical information (composition, valence state, etc.) at sub-nano scale. Our results are essential to understand the relationship between structure/local chemistry and the property/activity in different systems, and help to improve the performance of catalysts/devices for energy convert/storage applications.
D. Su, F. Wang, C. Ma, N. Jiang, Engineering Nano-Composite Li4Ti5O12 Anodes via Scanning Electron-Probe Fabrication, Nano Energy, http://dx.doi.org/10.1016/j.nanoen.2012.10.009 (2012)
D. Su, Q. Meng, M.-G. Han, C. A. F. Vaz, Y. Segal, F. J. Walker, M. Sawicki, C. Broadbridge, and C. H. Ahn, Origin of 90o Domain Wall Pinning in Pb(Zr0.2Ti0.8)O3 Heteroepitaxial Thin Films, Applied Physical Letters, 99, 102902, (2011)
D. Su, Tomoaki Yamada, Roman Gysel, Alexander K. Tagantsev, Paul Muralt, Nava Setter, and N. Jiang, The growth-mode-induced defects of epitaxial SrTiO3 thin films on LaAlO3 single crystal by a two-step-grown technique, Journal of Material Research, 27, 770 (2011)
D. Su, B. Yang, N. Jiang, M. Sawicki, C. Broadbridge, M. Couillard, J. W. Reiner, F. J. Walker, C. H. Ahn, and Y. Zhu, Valence Electron Energy-Loss spectroscopy of Ultrathin SrTiO3 Films Grown on Silicon (100) Single Crystal, Applied Physical Letters, 96, 121914(2010)
K. Gong, D. Su, R. R. Adzic, Platinum-Monolayer Shell on AuNi0.5Fe Nanoparticle Core Electrocatalyst with High Activity and Stability for the Oxygen Reduction Reaction, J. Am. Chem. Soc.,132, 14364(2010)