Carbon and other 2D materials beyond graphene for high-energy-density Asymmetric supercapacitors
Liaoning Key Lab for Energy Materials and Chemical Engineering, Dalian University of Technology
Abstract: Electrochemical capacitors (ECs) or supercapacitors, as an emerging class of energy storage devices, have received much attention due to their many advantages such as fast charging and discharging, great power density, long cycle life as well as low maintenance cost. Nevertheless, the energy density needs to be further boosted for meeting the advanced application for ECs. The high specific capacitance and wide electrochemical operation window are one of keys to realize the process. Herein, we present carbon and other 2D materials beyond graphene including the 2D porous carbon nanosheets via layered-nanospace-confinement strategy for high-rate performance, carbon-integrated binary/ternary-layer double hydroxide nanosheets (LDH) and their derived compounds with high specific capacitance. Asymmetric electrochemical supercapacitors with high energy density were further assembled and configured under aqueous electrolytes. Also, the electrochemical reaction kinetics process was further intensified through the modulated nano/microstructure of the carbon materials, and the effects of morphology and defects within carbon matrix on the electrochemical performance are discussed. Moreover, the capacitance contribution towards sodium ion storage was also discussed in terms of surface and near-surface chemistry. The present work will provide fundamental insights into the role of nano-structured carbon within electrode matrix on the electrochemical activity and direct the carbon-related electrode configuration/design for supercapacitors, even other energy storage and conversion devices.
Biography: Prof. Chang Yu received her Ph.D. degree from the School of Chemical Engineering at Dalian University of Technology (DUT) in 2008. She is currently a full professor for School of Chemical Engineering at DUT. She was also a visiting professor at Rice University (USA) in 2015. She focuses on the fundamental and applied research in carbon materials-related surface chemistry and catalysis, aiming to understand the multiscale and dimension effects as well as function of carbon materials in energy and catalysis fields in terms of product and process engineering. She has published more than 80 research papers in Energy Environ. Sci., Adv. Energy Mater, Adv. Funct. Mater.，Chem. Eng. J. and so on. Dr. Chang Yu has been awarded “the NSFC Young Scholar” in China in and “Outstanding Youth Award” in 2017 Global Chinese Chemical Engineers Symposium and so on.