Speaker: Prof. Wu Lu (The Ohio State University)

Time and Date: 13:30-15:00 pm, December 22, 2017

Place: Room B-213 of Micro-electronics Building, Handan Campus, Fudan University

Abstract:

Supercapacitors, based on fast ion transportation, are specialized to provide high power, long stability, and efficient energy storage using highly porous electrode materials. However, their low energy density excludes them from many potential applications that require both high energy density and high power density performances. In this talk, I will first introduce our approaches to synthesize nanoporous graphene materials for electrochemical energy storage applications. Then I will show supercapacitors made of these graphene nanomaterials are capable of achieving not only a high power density of 41 kW/kg and a Coulombic efficiency of 97.5%, but also a high energy density of 148.75 Wh/kg. A high specific gravimetric and volumetric capacitance (306.03 F/g and 64.27 F/cm³) are demonstrated. The devices can retain almost 100% capacitance after 7,000 charging/discharging cycles at a current density of 8A/g. At the end, I will discuss what material properties lead to the record performance of these graphene supercapacitors.

Biography:

Dr. Wu Lu is currently a professor at Department of Electrical and Computer Engineering, The Ohio State University (OSU). He received his Ph.D in physical electronics and optoelectronics in 1994 from Southeast University. Before he joined OSU as a faculty in 2002, he held a number of research positions at Electronics and Telecommunications Research Institute, South Korea, Nanyang Technological University, Singapore, and University of Illinois at Urbana-Champaign, USA. He was a World Class University (WCU) Professorship at Gwangju Institute of Science and Technology (GIST) supported by National Research Foundation, South Korea, from 2009 to 2014. He is a visiting or guest professor at GIST, Fudan University, Southeast University, respectively. He has published over 120 papers in international journals and delivered numerous plenary and invited talks at international conferences. He has received many awards including Lumley Research Award in 2006 and Lumley Collaborative Research Award in 2013 and 2016. His current research interests include semiconductor physics and devices, nanofabrication and nanomanufacturing, nanobiotechnology, chemical and biosensors, and nanomaterials for energy storage etc.