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Dr. Kwun Nam HUI

Faculty of Science and Technology

University of Macau

Avenida da Universidade, Taipa,

Macau, China

 

Biography:

Dr. Kwun Nam HUI is an assistant professor at the Institute of Applied Physics and Materials Engineering, Faculty of Science and Technology, University of Macau, Macau SAR, China. He obtained his B.Sc. degree in Physics from the Hong Kong University of Science and Technology in 2003 and his M.Phil. and Ph.D. degrees in Electrical and Electronic Engineering from the University of Hong Kong in 2007 and 2009, respectively. He worked as a postdoctoral associate in 2009 at the Institute of Advanced Materials, Devices, and Nanotechnology, Rutgers, The State University of New Jersey. He contributed to the development of the ultrafast photonic crystal waveguide modulator for communication. He joined Pusan National University in the fall of 2009. Recently, he joined University of Macau in in the fall of 2015. Thus far, he has conducted research in different areas related to energy and the environment, including Li-ion battery, supercapacitor, and electrode materials for direct methanol/direct hydrogen peroxide fuel cell, hydrogen production by methanol steam reforming, solid-state lighting, desiccant cooling, removal of volatile organic compounds in air, and wastewater treatment. His major contributions include the use of fluorescent nanospheres for proprietary white-light LEDs, design and implementation of proprietary vertically stacked polychromatic LED structure for color-tunable LEDs, first report of UV-stimulated emission from pivoted GaN-on Si microcavities, first demonstration of UV lasing of GaN nanopillar structure at room temperature, first demonstration of synergetic effects of MnO2/graphene composite to improve catalytic ozonation of gaseous toluene, development of reusable catalyst chip for wastewater treatment, green method for synthesizing graphene, metal (oxide)/graphene composite for fuel cell applications, and production of hierarchical N-doped porous carbon from biowastes as electrode materials for supercapacitors. As principal investigator, he has managed 12 research projects with a total research grant of USD 0.8 million. His research has led to one US patent, eleven Korea patents, four review papers, three book chapters, >100 peer-reviewed SCI journal papers, and >50 conference papers. He has served as lead guest editor/guest editor/member of the editorial board of a number of journals, such as Frontier, Reviews in Advanced Sciences and Engineering, Journal of Nanomaterials, Current Nanoscience, The Scientific World Journal, and Scientific Journals International. He was in the organizing committee of the 4th Conference on New Energy and Sustainable Development. His current research focuses on synthesis of hierarchical carbon/graphene materials as well as on the development of 3D hierarchical layered double hydroxide materials as advanced electrode materials for energy storage and conversion applications.



Topic: Engineering Spinel Materials for High Energy Density Supercapacitor

The continuous increase in energy demand has significantly stimulated a considerable number of studies for energy storage and conversion applications. Electrochemical capacitors have attracted extensive attention because of their overall advantages of bridging the gap between batteries and conventional capacitors. However, most commercial supercapacitors still suffer from low energy density (10 Wh kg−1), high cost, and bulky issues in certain consumer products, such as laptops, electronic digital cameras, and mobile phones. Therefore, developing an advanced electrochemical capacitor with advantages of high energy density, lightweight, and low cost while maintaining intrinsic high power density and long cycle life is imperative.

 

In this talk, the speaker presents his recent work in the development and applications of nanostructured spinel (AxB3-xO4) materials for SCs. First, he describes how the synergistic effect of spinel/graphite paper hybrid as high performance binder-free supercapacitor electrode. Second, he illustrates how core-shell nanostructured electrodes can achieve high energy density at high current density as well as high rate capability of for applications in SCs by providing more electroactive sites for electrochemical reactions, facilitating the electrolyte ions access to the surface of active materials, reducing the ions diffusion paths, maintaining the structural integrity of the materials during charge/discharge process, and improving the utilization rate of electrode. Third, he demonstrates the stacking concept as effective method of increasing mass loading of active materials without sacrificing the geometry of the nanostructures for achieving a higher electrochemical performance.

This work was supported by the Science and Technology Development Fund from Macau SAR (FDCT-098/2015/A3)



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