Interfaces & Defect Phenomena in Advanced Materials
(Supported by DOE-BES, NSF-MRSEC, SRC, Intel, NSF-MRI, ANL)
Studying structure-property relationships in advanced materials is one of the fundamental cornerstones of Materials Science and Engineering. The properties of multifunctional materials and the phenomena observed in such systems are inextricably linked to their complex interfacial and defect structures. As such, developing new materials systems and devices demands a profound understanding of the interfaces and defects in the material, whether intrinsic or engineered.
The VPD group focuses on extensively analyzing the intricate interface and defect structures in materials systems of interest by utilizing advanced electron microscopy, scanning probe and synchrotron x-ray scattering techniques. Our goal is to develop knowledge of not only static structural features, but to also monitor the dynamics of interfacial and defect phenomena using in-situ characterization techniques, and measure their localized and bulk properties. Most recently, this approach has been applied primarily to materials used for energy generation and energy storage, namely thermoelectric materials and Li-ion battery electrode materials.
Thermoelectric materials convert heat into electricity, making them a promising technology for recovering energy from waste heat. The VPD group, working with collaborators in the Kanatzidis (Chemistry) and Wolverton (MSE) groups, has shown that engineering materials with an all-scale hierarchical structure is an extremely effective approach for improving thermoelectric performance. This work, and the lessons learned, resulted in the two best thermoelectric materials to date: PbTe-SrTe and single crystal SnSe. Our current efforts are focused on developing new thermoelectric materials and studying their structural evolution at high temperature.
Understanding interface and defect structure across multiple length scales is also pivotal for developing new high-performance battery electrode materials. As members of the Center for Electrochemical Energy Science (a collaboration between ANL, UIUC, NU, and Purdue), the VPD group conducts ex-situ and also in-operando studies of model electrode materials that undergo intercalation or conversion reaction processes using Li+, Na+, and beyond. Elucidation of the structural transformations and interface dynamics within model systems aids with understanding important phenomena, such as ionic and electronic transport, and carries significant weight for correlating material structure to electrochemical performance.
In both of these fields, we make extensive use of the NUANCE center instruments and capabilities, in addition to ANL-APS synchrotron scattering facilities for both ex-situ and in-situ analysis of static and dynamic of interfacial and defect phenomena.
- Li-Dong Zhao, Gangjian Tan, Shiqiang Hao, Jiaqing He, Yanling Pei, Hang Chi, Heng Wang, Shengkai Gong, Huibin Xu, Vinayak P. Dravid, Ctirad Uher, G. Jeffrey Snyder, Chris Wolverton, Mercouri G. Kanatzidis, Ultrahigh power factor and thermoelectric performance in hole-doped single-crystal SnSe. Science 351, 141-144 (2016); (10.1126/science.aad3749).
- Li-Dong Zhao, Shih-Han Lo, Yongsheng Zhang, Hui Sun, Gangjian Tan, Ctirad Uher, C. Wolverton, Vinayak P. Dravid, Mercouri G. Kanatzidis, Ultralow thermal conductivity and high thermoelectric figure of merit in SnSe crystals. Nature 508, 373-377 (2014);
- Gangjian Tan, Fengyuan Shi, Jeff W. Doak, Hui Sun, Li-Dong Zhao, Pengli Wang, Ctirad Uher, Chris Wolverton, Vinayak P. Dravid, & Mercouri G. Kanatzidis. Extraordinary role of Hg in enhancing the thermoelectric performance of p-type SnTe. (2015). Energy & Environmental Science, 8(1), 267-277.
- Gangjian Tan, Fengyuan Shi, Shiqiang Hao, Hang Chi, Li-Dong Zhao, Ctirad Uher, Chris Wolverton, Vinayak P. Dravid, & Mercouri G. Kanatzidis. Codoping in SnTe: Enhancement of Thermoelectric Performance through Synergy of Resonance Levels and Band Convergence. (2015). Journal of the American Chemical Society, 137(15), 5100-5112.
- Kanishka Biswas, Jiaqing He, Ivan D. Blum, Iwu Chun, Timothy P. Hogan, David N. Seidman, Vinayak P. Dravid, Mercouri G. Kanatzidis, High-performance bulk thermoelectrics with all-scale hierarchical architectures (vol 489, pg 414, 2012). Nature 490, (2012); DOI: (10.1038/nature11645).
Battery Electrode Materials:
- Tim T. Fister, Xianyi Hu, Jennifer Esbenshade, Xiao Chen, Jinsong Wu, Vinayak Dravid, Michael Bedzyk, Brandon Long, Andrew A. Gewirth, Bing Shi, Christian M. Schlepuetz, Paul Fenter, Dimensionally Controlled Lithiation of Chromium Oxide. Chemistry of Materials 28, 47-54 (2016);
- Laila Jaber-Ansari, Kanan P. Puntambekar, Soo Kim, Muratahan Aykol, Langli Luo, Jinsong Wu, Benjamin D. Myers, Hakim Iddir, John T. Russell, Spencer J. Saldaña, Rajan Kumar, Michael M. Thackeray, Larry A. Curtiss, Vinayak P. Dravid, Chris Wolverton, & Mark C. Hersam. Suppressing Manganese Dissolution from Lithium Manganese Oxide Spinel Cathodes with Single-Layer Graphene. (2015). Advanced Energy Materials, 5(17).
- Langli Luo, Jinsong Wu, Junming Xu, & Vinayak P. Dravid. Atomic Resolution Study of Reversible Conversion Reaction in Metal Oxide Electrodes for Lithium-Ion Battery. (2014). ACS Nano, 8(11), 11560-11566. DOI:10.1021/nn504806h
- Langli Luo, Jinsong Wu, Jiayan Luo, Jiaxing Huang, Vinayak P. Dravid, Dynamics of Electrochemical Lithiation/Delithiation of Graphene-Encapsulated Silicon Nanoparticles Studied by In-situ TEM. Scientific Reports 4, 3863 (2014);
Links to Other Dravid Group Research Themes:
Spatially & Dimensionally Confined Structures and Assembly
Interfaces and Defect Phenomena in Advanced Materials
Synthesis, Patterning and Microscopy of Nanostructures
“Theranostic” Nanostructures: Combined Biomedical Imaging & Targeted Therapeutics
Integrated Nanosystems for Biochemical Sensing & Diagnostics
Novel Microscopy and Analysis