二、会议地址：Zoom Meeting ID：891 8900 8295 Password: 123456
主题一：High Energy Aqueous Zn-ion Batteries: Where are they now and where are they going to?
主讲嘉宾：Professor John Wang, National University of Singapore
For the past two decades, Lithium Ion Batteries (LIBs) have been the working horse for almost all portable and wearable devices, as well as those for transport and electrical/hybrid vehicles more recently. They are good, but not good enough with the some of the key performance parameters, especially the poor safety in association with use of the organic liquid electrolytes. There is an urgent need for new generation energy storage devices with high volumetric energy density, high rate capability, high power density, mechanical flexibility and long-term safety. Aqueous Zn Ion Batteries (ZIBs) are among the most promising choices for the “Beyond Lithium Ion” batteries, due to the low cost, high safety, and long term sustainability. However, there are several unsolved challenges faced by aqueous zinc ion batteries, including very limited choices of cathode materials for intercalation of Zn ions, their stability, dendrite formation at the zinc metal anode side, and issues with aqueous electrolytes, as well as their integrations into full cells. There are also unsolved key understandings on Zn ion transfer and storage mechanisms in ZIBs. In this talk, I will visit some of our recent researches conducted on ZIBs, in attempts to address of these key questions.
John Wang is Professor of Materials Science and Engineering at the National University of Singapore (NUS). He has more than 30 years of experience in research and education of functional materials and materials chemistry. He served the Head of Department of Materials Science and Engineering at NUS for seven years (July 2012- June 2019). His current research focuses include: energy materials and devices, 2D materials chemistry, and nanostructured materials for energy and water technologies. He has published >400 papers in prestigious, top international refereed journals, and H-index = 86. In 2019, Professor John Wang is elected Academician of the Asia Pacific Academy of Materials (APAM). He is Fellow of the Institute of Materials, Minerals and Mining (UK). John Wang is Clarivate Web of Science Highly Cited Researcher (2020).
主题二：Carbon Nanomaterial Enabled Oxygen Electrocatalysts
主讲嘉宾：Professor Yuan Chen, The University of Sydney
The electrochemical redox reactions of oxygen (i.e., oxygen reduction reaction (ORR) to water and oxygen evolution reaction (OER) from water) govern the overall reaction rate in many electrochemical systems, including fuel cells, metal-air batteries, and water electrolyzers. Carbon materials, e.g., carbon black, have long been exclusively used as catalyst support for platinum-based electrocatalysts for ORR in low-temperature fuel cells. The emergence of carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, with well-defined structures and unique electronic, electrical, and chemical properties, offers opportunities to create new oxygen electrocatalysts. In this talk, two of our works in this area will be introduced. First, graphene oxide (GO) was used as a substrate to produce a family of amorphous bimetallic oxide nanoparticles such as Fe0.5CO0.5Ox anchored on N-doped reduced GO, achieving simultaneous control of nanoparticle elemental composition, size, and crystallinity, which enabled high-performance rechargeable zinc-air batteries. Second, coaxial one-dimensional van der Waals heterostructures (1D vdWHs) comprised of a CNT core and a thickness tunable thienothiophene-pyrene covalent organic framework (COF) shell was developed. The charge transfer from CNTs lowers COF’s bandgap and work function, which reduces the charge transfer barrier between the active catalytic sites and adsorbed oxygen intermediates, resulting in dramatically enhanced catalytic activity.
Professor Yuan Chen received a bachelor’s degree from Tsinghua University and a Ph.D. from Yale University. He was an Assistant and an Associate Professor at Nanyang Technological University Singapore from 2005 to 2015. He joined the University of Sydney in 2015. His research focuses on carbon materials and their sustainable energy and environmental applications, including supercapacitors, batteries, electrocatalysts, membranes, and antibacterial coatings. He is a Fellow of the Institution of Chemical Engineers, the Royal Society of Chemistry (UK), and the Royal Australian Chemical Institute. He is currently serving as an editor for Carbon (Elsevier) and Journal of Alloys and Compounds.
编辑：林坤 / 审核：林坤 / 发布者：陈伟