Biography: Dr. Qinghua Liu is currently a professor of National Synchrotron Radiation Laboratory, University of Science and Technology of China (USTC). He received his Ph.D. in 2009 from USTC, and then did research work on renewable energy conversion and synchrotron radiation experimental techniques. His current research interests focus on the synthesis and characterizations of advanced energy functional nanomaterials for photocatalytic, electrochemical, and photoelectrochemical applications and the development of advanced in situ/operando synchrotron radiation experimental techniques and their applications in energy storage and reaction mechanism.
Speech Title: In-situ Synchrotron Infrared Techniques and Its Applications in Clean Energy Conversion
Abstract: The scaling up of hydrogen energy system depends on the development of robust and efficient catalysts for water splitting and the reverse reactions. Operando infrared (IR) spectroscopy is one of the key methods to provide intuitive insights for hydrogen/oxygen-based intermediates to accelerate the screening process of catalysts. Unfortunately, the application of operando IR spectroscopy in the liquid-solid catalytic system is strongly impeded by the dramatic absorption of water and weak signals of photo/electrochemical reaction intermediates.
Based on the China’s synchrotron radiation facilities, we have established an in-situ electrochemical synchrotron radiation infrared (SR-IR) spectroscopy experimental technique, which opened up the application research of SR-IR technology in the field of electrochemical energy storage and conversion in China. By using the developed in-situ synchrotron radiation technology platform, the change rules of interface active sites and the key reaction intermediate products on the lattice-strained NiFe MOFs and single-atom catalysts have been obtained in the working conditions (Nature Energy, 2019, 4, 115). Moreover, the mechanism of the oxygen related electrocatalysis reaction process at the surface of the nanostructured catalysts has been clarified at the atomic and molecular level (Nature Chem., 2020, 12, 717; JACS, 2020, 142, 12306). These new research results give useful hints for further manipulation of surface/interface structure and performance of low-dimensional nanostructure functional materials. Meanwhile, the as-developed in-situ synchrotron radiation techniques also provide a useful platform for the high-level domestic synchrotron radiation users to study photoelectrochemical reaction dynamics and accelerate the production of synchrotron radiation scientific achievements in China.
Biography: Dr. Gomaa A. M. Ali is an Associate Professor at the Chemistry Department, Faculty of Science, Al-Azhar University, Egypt. He has 14 years of experience working in the research areas of materials science, nanocomposites, humidity sensing, graphene, supercapacitors, water treatment, and drug delivery. He was awarded his Ph.D. in Advanced Nanomaterials for Energy Storage from UMP, Malaysia. He is the recipient of some national and international prizes and awards such as TWAS-AREP (2018), Obada International Prize (2021), Gold Medal (Archimedes, Russia, 2014), Green Technology Award (CITREX, Malaysia, 2015), Gold Medal (British Invention Show, UK, 2015). Dr. Gomaa has published over 111 journal articles and 16 book chapters on a broad range of crossdisciplinary research fields, including advanced multifunctional materials, nanotechnology, supercapacitor, water treatment, humidity sensing, biosensing, corrosion, and corrosion, drug delivery, and materials for energy applications. So far, he has more than 2891 citations and an h-index of 31. Dr. Gomaa has served as both Senior xiv Editors and Contributors Editor and board member of many international journals and a reviewer for more than 55 WoS journals. Dr. Gomaa is a member of national and international scientific societies, such as the American Chemical Society (ACS) and the Egyptian Young Academy of Sciences (EYAS). He is an Editor of the handbook “Waste recycling technologies for nanomaterials manufacturing” Springer, 2021.
Speech Title: Low-Cost and High-Performance Asymmetric Supercapacitor
Abstract: Electrochemical materials, namely MnO2 and reduced graphene oxide (rGO), have been prepared in diverse morphologies (nanoflowers and nanosheets, respectively). Different physical and chemical characterizations were conducted to investigate the material structure and morphology. Electrochemical properties of these materials have been studied comprehensively using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy to evaluate their suitability for supercapacitive energy storage. MnO2 nanoflowers were obtained by recycling spent batteries. The single electrodes of MnO2 nanoflowers and rGO nanosheets exhibit a high specific capacitance of 208.5 F g−1 and 145 F g−1, respectively. Therefore, an asymmetrical supercapacitor was fabricated from both materials and electrochemically evaluated. It shows a superb supercapacitive performance of up to 2.0 V in Na2SO4. The asymmetrical supercapacitor produces a high specific capacitance (177.6 F g−1), energy density (24.7 Wh kg−1) and stability (95.2% over 4000 cycles). The findings recommend using MnO2 nanoflowers and rGO nanosheets as an asymmetric supercapacitor.