Sept. 30: "Enzyme driven synthesis of high-performance heterostructured photocatalysts"
Lehigh University's Steven McIntosh, Professor and Department Chair; Zisman Family Professor of Chemical and Biomolecular Engineering to lead Enzyme Driven Synthesis of High-Performance Heterostructured Photocatalysts seminar at West Virginia University, Department of Chemical and Biomedical Engineering, Morgantown West Virginia on Friday, September 30, 2022 8:45 AM EST, Room G39 ESB (Engineering Sciences Building).
McIntosh’s research focuses on the development of functional materials for energy systems, with topics ranging from Solid Oxide Fuel Cell electrodes to green synthesis of quantum confined nanomaterials. McIntosh is a Fellow of the Royal Society of Chemistry (RSC), and recipient of the NSF CAREER award. He is an associate editor for RSC Advances and editor for the RSC Specialist Periodical Reports Electrochemistry. From 2018-2021 he served as the founding Associate Director of Lehigh’s Interdisciplinary Research Institute for Functional Materials and Devices. Most recently, he was named as the inaugural Zisman Family Chair in Chemical and Biomolecular Engineering.
Abstract: Quantum confined nanomaterials are at the core of most photocatalysts due to the superior functional properties exhibited by these materials when compared to their bulk counterparts. However, conventional nanomaterial syntheses often involve high temperatures, organic solvents, and multi-step processing, which limits the scalability of their production. In contrast, nature synthesizes nanomaterials under low temperature, aqueous conditions through the enzymatic processes including biomineralization. Our focus has been to create alternative green synthesis pathways while maintaining functional performance. This is achieved by understanding and controlling the nanocrystal growth mechanism, and through minimization of the system complexity down to isolating the single enzyme responsible for inducing crystal growth in solution. We then produce highly active materials via low temperature, aqueous phase, post-synthetic processing to create photocatalysts that are comparable to, or outperform, those made through conventional syntheses. In this talk I will focus on our work in cadmium sulfide-based hydrogen evolution photocatalysts, in which we have self-assembled cadmium sulfide/reduced graphene oxide nanocomposites and cadmium sulfide/zinc sulfide core/shell nanocrystal photocatalysts both with hydrogen evolution rates comparable to the conventionally synthesized materials.