分论坛会议报告:Magnetic Field Enhanced Energy Storage

发布时间:2016-10-24|阅读次数:15

 

ZhanhuGuo

Integrated Composites Laboratory, University of Tennessee, Knoxville, TN 37934, USA

 

Electrochemical capacitors (ECs) have been in urgent demand for utilizing sustainable and renewable energy sources due to the concerns over both the depletion of fossil fuels and climate changes. However, the current ECs have some challenges, for example, high power but low energy densities for electric double layer capacitors or high energy but low power densities for pseudocapacitors. Main efforts have been focused on developing new electrode materials (for example, highly conductive composites with high capacitance), or designing hierarchical nanomaterials (for example, microstructures with shortened low-resistive pathways for electron transport and ion diffusion). Recently, a small magnetic field of about 0.072 T was reported to significantly enhance the capacitance by 155% in a novel magnetic graphene nanocomposite electrode.[1-3] However, the measured positive giant magnetoresistance (GMR, a large resistance change upon applying a magnetic field) of the electrode materials failed to interpret the capacitance enhancement. Therefore, how the magnetic field affects the electrochemical energy storage remains unclear.  In this talk, the lab-made conductive polymer based- nanocomposites have been designed and synthesized to disclose this puzzle.

 

References

[1] J. Zhu, M. Chen, H. Qu, Z. Luo, S. Wu, H. A. Colorado, S. Wei and Z. Guo. Energy & Environmental Science. 6(2013) 194-204.

[2] J. Zhu, M. Chen, H. Wei, N. Yerra, N. Haldolaarachchige, Z. Luo, D. P. Young, T. C. Ho, S. Wei and Z. Guo, Nano Energy, 6, 180-192 (2014)

 

Biography

Dr. Guo, currently an Associate Professor in Chemical & Biomolecular Engineering Department of at the University of Tennessee Knoxville (UTK), obtained his Bachelor degree from Shan-dong University of Science and Technology (1996), Master degree from Beijing University of Chemical Technology (1999), and Ph.D. degree from Louisiana State University (2005). All the degrees were from Chemical Engineering. Before joining UTK, Dr. Guo was working in Lamar University from 2008-2014 as Assistant/Associate Professor in Dan F. Smith Department of Chemical Engineering. Meanwhile, Dr. Guo had received a three-year (2005-2008) postdoctoral training in the Mechanical and Aerospace Engineering Department at the University of California Los Angeles. Dr. Guo directs the Integrated Composites Laboratory (ICL) with more than 20 members and has authored/coauthored more than 310 peer-reviewed journal papers and five patents. The scientific results have been reported by major media including Nanotechweb by the Institute of Physics (IOP), Plastics Engineering Magazine by the Society of Plastics Engineering (SPE), MaterialsViews by Wiley, National Science Foundation (NSF), etc.  Dr. Guo has received Honorary Nomination Award of 2007 for UCLA-Chancellor Research, University Merit Award of 2012 for teaching, and University Scholar Award of 2013 for research at Lamar University. Dr. Guo had served as Chair for the Composites Division of AIChE (2011-2012). Dr. Guo’s current research team focuses on multifunctional light-weight nanocomposites, especially with polymer and carbon as the hosting matrix to solve the energy and sustainability issues. The research activities have been supported by NSF, American Chemical Society (ACS) Petroleum Research Fund (PRF), and several global industrial companies. For more information, please visit http://composites.utk.edu.