Cain Department of Chemical Engineering SEMINAR
“FexNi1-xO(H)y Nanocatalysts for Alkaline Electrocatalysis”
Lauren F. Greenlee, Ph.D.
Louis Owen Professorship in Chemical Engineering
Ralph E. Martin Department of Chemical Engineering, University of Arkansas
Sustainability in energy conversion processes requires materials that are designed to be high-performance and durable, yet cost-effective. Alkaline electrochemical systems provide an opportunity to explore non-precious metal alternatives to precious metal-based electrocatalysts, where the use of non-precious metals would allow a significant reduction in cost. Recently, iron-incorporated nickel oxide/hydroxide catalysts have been a focus for alkaline electrooxidation reactions, and in particular, for the oxygen evolution reaction. This focus results from the newly identified role of iron in controlling catalyst activity. While fundamental research largely focuses on the study of bulk films, there is a need for catalysts that have high mass normalized activities, or, high surface area-to-volume ratio. Our research interests in this area focus on the development of FeNi bimetallic nanoparticles. We develop nanoparticle materials for specific electrochemical or chemical reactions, such as the oxygen evolution reaction, through variation of bimetallic composition, morphological structure, extent of oxide/oxyhydroxide phases, and ligand concentration and molecular structure. Much of our work focuses on the use of complementary high resolution characterization tools to understand how synthesis directs nanoparticle structure and how structure impacts electrocatalytic activity. In this seminar, I will discuss some of our on-going work on iron-nickel oxide/hydroxide nanoparticle materials suite that demonstrates promising performance for the oxygen evolution reaction. I will discuss how we synthesize our nanoparticles, how we control nanoparticle properties such as morphology and composition, and our understanding of how nanoparticle properties influence catalyst performance.
Friday, April 13, 2018
1100 Patrick F. Taylor Hall