Guoping Xiong, PhDMechanical Engineering, Purdue University
The need to store and convert energy across diverse scales in a modern technological society necessitates the design of large and small energy systems, among which electrochemical energy storage and conversion systems such as batteries and supercapacitors have attracted much interest in the past several decades. The development of novel materials has significantly enhanced electrochemical performance, among which graphene-based nanomaterials (e.g., graphene and carbon nanotubes) have particularly attracted much attention. However, many critical issues remain unresolved in current energy systems such as low charging rate, low energy and/or power density, poor cycle life, poor thermal management, low production quantity, and low environmental sustainability, impeding their broad adoption in new engineering applications. Therefore, the development of new, green and scalable materials and technologies is essential to design energy systems with comprehensive outstanding electrochemical, thermal and mechanical properties.
In this talk, I will present our efforts in developing scalable graphene-based materials for energy engineering applications. In particular, graphene nanopetals (GPs), different from conventional horizontal graphene grown by thermal chemical vapor deposition (CVD), are synthesized by microwave plasma CVD (MPCVD) as a fundamental platform for electrochemical energy storage and conversion devices. A fundamental understanding of GP growth mechanisms and charge transfer behavior and mechanisms in GP-based electrodes will be presented to reveal their advantages and limitations. Moreover, scalable production of such energy materials/devices is imperative to realize the transition from laboratory-scale materials to industrial applications. I will present our work on roll-to-roll manufacturing of GPs on low-cost, green, organic, and flexible cotton/hemp substrates. In addition, graphene-based multifunctional polymer nanocomposites for energy systems will be presented. Finally, our work on developing graphene-based energy storage and conversion systems with unique thermal properties will also be presented.
Dr. Guoping Xiong is currently a Postdoctoral Research Associate working with Prof. Timothy S. Fisher in the school of Mechanical Engineering at Purdue University-West Lafayette, IN, USA since 2014. During 2014, he worked as a Lead Process Engineer at BlueVine Graphene Industries, Inc., a startup company that licensed his Ph.D. research work. He received his Ph.D. degree in Mechanical Engineering from Purdue University in 2013, M.S. degree in Materials Science & Engineering from Tsinghua University, Beijing, China in 2008, and B.S. degree in Materials Processing Engineering (minor in Computer Science & Technology) from Huazhong University of Science & Technology (HUST), Wuhan, China in 2005. Dr. Xiong was the recipient of the Ross Doctoral Fellowship during the academic year (2008-2009) from Purdue University. His primary research interests mainly involve synthesis and scalable manufacturing of micro/nano-materials for high-performance energy storage and conversion systems and their related thermal management and transport process, coupled with theoretical and numerical analysis to understand the underlying mechanisms.
Host: Dr. Carmen Lilley