Youngil Lee has completed his Ph.D. at the age of 27 years from Louisiana State University and is currently professor of department of chemistry at University of Ulsan from 2005. He has been studied characterization and synthesis of cathode materials for lithium ion battery and published more than 90 papers in reputed journals. Especially, he is interesting to study of solid-state NMR spectroscopy to characterize the relationship between the microstructure and electrochemical properties for energy materials.
Olivine structured LiMPO4 (M = Fe, Mn, and Co) has attracted as considerable interest as a new class of cathode material for the next generation lithium ion battery because of their intrinsic merits: high theoretical capacity, excellent thermal stability, structural stability, environment friendly, and low material cost compared to commercial cathode materials. The substitution of anion, such as F-, I-, and BO33-, on phosphate site in olivine material had been prepared by solid state reaction without additional carbon sources. Samples were characterized by XRD, SEM, TEM with EDX mapping, XPS, galvanostatic charge-discharge testing, and solid-state NMR spectroscopy. All of prepared samples had shown enhanced initial discharge capacity and long cycleability. Details results with additional ongoing study will be discussed in the presentation.
Mabrook S. Amer obtained his undergraduate degree in chemistry-physics from Thamar University in Yemen - 2005. Then he completed his MSc degree in Electrochemistry at King Saud University in 2013. His M.Sc. thesis was devoted to the Development of a heteropolyanion-modified carbon electrode for Cyclohexane electrocatalytic oxidation. Currently he is working as a researcher in Electrochemistry Research group (ERG) at King Saud University. He started his PhD studies at the same University in 2014. His present research interests: Synthesis, characterization and application, nanostructured materials modification, assembly, construction of highly ordered semiconductors mesoporous materials for electrochemical and photoelectrochemical hydrogen production and energy storage and conversion.
The fabrication of highly active, robust and cost-effective catalyst with earth abundant elements for efficient electrochemical splitting of water to hydrogen and oxygen is of essential significance for clean and sustainable energy conversion and storage systems. In this study, we present a controllable and reliable method for the doping of mesoporous TiO2 with appropriate transition metal ( TM ) dopants for an efficient electrocatalytic oxygen evolution reaction (OER). The ordered mesoporous TM-TiO2 with uniform large mesopores and a crystalline framework is successfully synthesized through a chelating assisted soft-template strategy using amphiphilic triblock copolymer Pluronic F127 (PEO106PPO70PEO106) as a structure directing agent. Compared to the pure TiO2 mesoporous, the TM-doped TiO2 mesoporous exhibit greatly enhanced OER activity. Furthermore, the TM dopant concentration significantly affects the oxygen evolution reaction (OER) activity of TM-TiO2 mesoporous, and the Co-TiO2 with very low wt% show the highest OER activity with a 0.286 V reduction of the overpotential with respect to undoped TiO2 mesoporous, and higher mass activity 4460 mA mg−1 , higher specific activity 2 mA cm−2, indicating that TM substitutions on mesoporous TiO2 crystal are able to alter the adsorption energy of reaction intermediates for OER in spite of the low quantity of dopant.