April 2019
Phase Evolution and Interfaces in Electrode Materials for Energy Storage
Dong Su Center for Functional Nanomaterials, Brookhaven National Laboratory and Department of Materials Science and Engineering, Stony Brook University Advanced (scanning) transmission electron microscopy ((S)TEM) techniques have been intensively applied to study the materials for energy storage. With/Combining different TEM techniques (including in-situ TEM and diffraction, HAADF-STEM, and STEM-electron energy-loss spectroscopy (EELS)), researchers are able to probe local structural and chemical information of electrode materials, at a resolution of nanoscale. This talk will cover my recent work on using in-situ…
Find out more »Towards Deterministic Electrode Design: Elucidating the Role of Surface Chemistry and Microstructure on Redox Flow Battery Performance
Electrochemical energy storage has emerged as a critical technology to enable sustainable electricity generation by alleviating intermittency from renewable sources, reducing transmission congestion, enhancing grid resiliency, and decoupling generation from demand . Redox flow batteries (RFBs) are rechargeable electrochemical devices which hold promise for energy-intensive grid storage applications, but further improvements are needed for universal adoption . While research efforts have primarily focused on the discovery and development of inexpensive designer redox couples, significant cost reductions may also be achieved…
Find out more »May 2019
Sustainable shale gas conversion processes: Research efforts towards capturing and utilizing CO2
Abstract The high availability of shale gas has spurred the interest for improving the sustainability and expanding the share of its conversion processes to valuable chemicals. Hydrogen, one of the high-volume raw materials in the chemical and refining sector, heavily depends on natural gas. Almost 50% of hydrogen worldwide production comes from methane steam reforming process. Process Intensification by combining reaction and separation together in a single step can contribute to the simplification and eventually to lowering C-footprint of the…
Find out more »June 2019
CFD of reacting flows at surfaces: methodologies and applications
In this talk, I will present the main achievements of my group in developing methodologies and strategies for the solution of the Navier-Stokes equations of reacting flows in complex and general geometries with a detailed microkinetic description of the surface reactivity based on electronic structure calculations both at the level of mean-field approximation and kinetic Monte Carlo simulations . I will show the numerical methodologies and speed-up techniques both in the context of fixed-bed and fluidized catalytic reactors . Hierarchical…
Find out more »November 2019
Identifying Active Sites, Quantifying Site Heterogeneity, and Revealing Site-Site Synergies in Zeolite and Zeotype Catalysts
Abstract Zeolite HZSM-5, a member of the MFI family of structures, is an important catalyst from both practical application and fundamental structure-function perspectives. With known uses ranging from cracking, isomerization, and methanol-to-hydrocarbon chemistries, the traditional view of only one type of acidic Brønsted proton site in HZSM-5 has been called into question by recent experimental data on zeolites with relatively high framework Al content. Motivated by surprising increases in reaction rates observed for some hydrocarbon/HZSM-5 probe reactions in the presence…
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