Mediator All-Solid-State Supercapacitor and Self-sustained Electrochemical Catalysts
Dr. Xiangyang Zhou
Department of Mechanical and Aerospace Engineering University of Miami
Refreshments will be served at 1:15 PM at OE134
Supercapacitor (SC) as an alternative to the Li-ion battery possesses a very high charge rate, output power density, and cycleability. Development of all-solid-state electrolyte supercapacitors is encouraged by their appealing features for a number of important applications. However, it is hindered by relatively low ionic conductivity and low ionic accessibility of the polymer electrolytes to active phases. In this talk, why and how the concepts of mediator all-solid-state supercapacitors were conceived will be given. Experimental evidence will be presented to demonstrate the validity of these concepts for several polymer electrolyte systems. Increasing the performance/cost ratio of catalysts reflects a long-term passion in the area of chemical engineering. Usually, the presence of precious metals in the catalyst systems is required to enable a satisfactory performance and to maintain an acceptable stability/durability. However, our study demonstrates that for certain oxidation/reduction reactions, we can utilize a microscopic electrochemical process to sustain the promotion of the active phases to a high performance level in the absence of any precious metal. It has been demonstrated that this concept works effectively in hydrocarbon reforming/hydrogen production and recombination of carbon dioxide which are two key processes of the clean energy technology.
Dr. Xiangyang Zhou is an associate professor at Department of Mechanical and Aerospace Engineering, University of Miami. He received his BS in physics from Wuhan University, China, MS in Institute of Metal Research, Chinese Academy of Sciences, and PhD in materials scince and engineering from University of Newcastle upon Tyne, England. His team is actively working in areas of electrochemical energy storage, catalytic hydrocarbon reforming/hydrogen production, electrochemical sensor, fuel cells, and electrochemistry/corrosion in high temperature water. His research has been supported by NSF, ONR, AFOSR, FAA, and industrial sponsors. Dr. Zhou has published 46 peer-reviewed papers and has been invited to give several talks in international conferences.