Brown University School of Engineering

Engineering Seminar: Chemical and Biochemical Engineering

Add event to my Google calendar Add event to my Google calendar Share this event on facebook E-mail this event
Tuesday, December 12, 2017 12:00pm - 1:00pm

Andre D. Taylor, Associate Professor, Yale University, will present a talk: "Challenging Nanostructured Materials for Advanced Energy Devices". Abstract: One of the key challenges facing the widespread use and commercialization of promising energy devices (i.e. fuel cells, batteries, organic solar cells etc.) is the high cost of the electrocatalytic and electrolyte materials and inefficiencies in their assembly and utilization. In this talk, I will present some examples of how we are designing nanomaterials such as graphene-based carbons, MXenes, and bulk metallic glass (BMG) alloys that can be incorporated into new architectures for high performance nanostructured-enabled energy devices. Electrocatalysts. I will describe a new class of materials, Pt58Cu15Ni5P22 bulk metallic glass that can circumvent Pt-based anode poisoning and agglomeration/dissolution typically associated with supported catalysts during long-term operation in fuel cells. By using subtractive (dealloying) and additive (galvanic replacement) techniques we can push these materials into new directions beyond their glass formability. These amorphous metal alloys can serve as an interesting platform for next-generation catalysts and devices such as the first all bulk metallic glass micro fuel cell. Newer alloys are currently being developed using combinatorial techniques. New Device Architectures. Our development of a mesoporous catalytic membrane for Li-O2 batteries recently led us to the recent development of vampire batteries that use heme molecules as a redox mediator. We will also describe our latest efforts on Förster resonance energy (FRET) based solar cells with a single junction power conversion efficiency >10% for a polymer based solar cell. Remarkably, these solar cells can be tuned across multiple colors without decreasing its power conversion efficiency creating new opportunities for integration.