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Dr. Kwun Nam Hui
Pusan National University, Republic of Korea
3D Nanostructured Layered Double Hydroxide Materials for Energy Storage

With the sharp increase in the world energy-use over the past decades, there has been considerable interest in searching for high-performance energy storage systems, such as lithium ion batteries and supercapacitors (SCs). SCs have attracted considerable interest over the past few decades owing to their fast charge and discharge rate, high power density, long cycle life, and high reliability. Owing to such features, SCs have been used in advanced applications, such as portable electronic devices, hybrid electric vehicles, integration with fuel cell and battery, and emergency doors on the Airbus A380. Generally, SCs can be divided into two types, which rely on different electron storage mechanisms: electrical double layer capacitors (by ion adsorption) and pseudocapacitors (by fast surface redox reactions). Pseudocapacitorsnormally utilize transition metal oxides/hydroxides as electrode materials, producing capacitances exceeding those of double-layer carbonaceous materials.Therefore, the pseudocapacitive performance has been studied extensively. 

In this talk, the speaker presents hisrecent work in the development and applications of 3D nanostructured layered double hydroxide (LDH) materials for SCs. First, he describes how the synergistic effect of layered double hydroxide/graphene nanosheets (LDH/GNS) nanocomposite enhances specific capacitance. Second, he illustrates how to achieve high energy density at high current density as well as high rate capability of LDH/GNS electrodes for applications in SCs by reducing the equivalent series resistance and the charge transfer resistance of the electrode. Third, he demonstrates dopant and core-shell structure as effective methods of fabricating high conductive LDH materials for achieving a higher pseudocapacitive performance.

Dr. Kwun Nam Hui is an Associate Professor at Department of Materials Science and Engineering of Pusan National University, South Korea. He earned his BSc degree in Physics from The Hong Kong University of Science and Technology in 2003, M.Phil. and PhD degrees in Electrical and Electronic Engineering from The University of Hong Kong in 2007 and 2009, respectively. He then worked as Postdoctoral Associate to investigate the ultrafast photonic crystal waveguide modulator for communication at Institute of Advanced Materials, Devices and Nanotechnology, Rutgers, The State University of New Jersey in 2009. Thus far, he has conducted research in different areas related to energy and 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 compound, and wastewater treatment. His major contributions include the useof 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 GaNnanopillar structure at room temperature,development of reusable catalyst chip for wastewater treatment, green method to synthesize graphene, metal (oxide)/graphene composite for fuel cell applications, and production of hierarchical N-doped porous carbon from biowaste as electrode materials for supercapacitor, among others. He has managed 10 research projects as Principal Investigator with a total research grant > USD 0.5 million. His research has led to 1 US patent, 11 Korea patents, 4 review papers, 4 book chapters, >90 peer-reviewed journal papers, and >50 conference papers.He has served as guest editor/ member of editor board of a number journalssuch as Frontier, Reviews in Advanced Sciences and Engineering, Journal of Nanomaterials,The Scientific World Journal, and Scientific Journals International.
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