讲座嘉宾：Prof. K. N. Hui（澳门大学）

讲座主持：林展教授

讲座时间：2018年4月23日（周一）15:00-16:00

讲座地点：工学四号馆202

讲座主题：高性能超级电容器的电极设计

主讲人简介：

Dr. Kwun Nam Hui is an Associate Professor at the Institute of Applied Physics and Materials Engineering, University of Macau, Macau SAR, China. Prior to this, he was Associate Professor at School of Materials Science and Engineering at Pusan National University, Republic of Korea. His research interests include design and synthesis of nanostructured materials for electrochemical energy storage and conversion including batteries, supercapacitors, and fuel cells.

(https://iapme.umac.mo/staff/academic-staff/hui-kwun-nam/)

报告简介：

Supercapacitors are advantageous for their high power density (1-10 kWkg^-1), fast charge propagation dynamics within seconds, and long cycling life (> 100,000 cycles) compared with batteries. Carbon-based materials are generally used as electrode materials in electrical double-layer capacitors due to their large specific surface area, high electrical conductivity, and low cost. Although high power density and cycling stability have been demonstrated by carbon-based materials, the capacitance and energy density are low because the charges storage mechanism is based on charge separation at the electrode/electrolyte interface. In contrast to electrical double-layer capacitors, pseudocapacitors utilize transition metal oxides/hydroxides materials that store charges via fast and reversible Faradaic reactions at their surface, resulting in higher specific capacitance and energy density but low power density and cycle life. Currently, the biggest obstacle impeding the development of high-performance supercapacitors is the trade-offs between high energy and high power densities considering the origin of different charge storage mechanisms in electric double-layer capacitors and pseudocapacitors. A rational design of electrodes has become an appealing strategy in circumventing the trade-offs between energy and power densities. In this talk, the speaker will present his recent work in the design and development of metal oxide/hydroxide electrode materials for supercapacitors. By rationally designing a hybrid electrode consisting of carbon/graphene/metal oxide/hydroxide, desirable porous structure and huge ion-accessible surface area for rapid electronic and ionic pathways can be achieved. This design strategy, fabrication approach and the promising electroactive materials offer great opportunities for the development of high energy density while retaining high power density in supercapacitors.