[2019 Fall DLS Seminar] Dr. Yun Jeong Hwang (KIST) Dec. 4th
[Distinguished Lecture Series]
Wed. 2019, 4:30pm
N Center #86120, Sungkyunkwan University, Suwon
Sustainable Carbon Cycle through Electrochemical CO₂ Reduction Reaction to Value-added Chemical
Dr. Yun Jeong Hwang
(Clean Energy Research Center & Division of Energy and Environmental Technology, KIST)
To mitigate the atmospheric level of the representative greenhouse gas, CO2, utilization techniques have been recently highlighted. Electrochemical CO2 conversion technique can be a promising candidate because it can be integrated with the intermittent renewable energy resources and the store it in the chemical energy form. However, still, there are many technical issues, and one of them is lack of the efficient and durable electrocatalysts. The electrochemical CO2 reduction reaction (CO2RR) requires proton sources, and water is widely used, but hydrogen evolution reaction (HER) is inevitable and serious competitive reaction which decrease the product selectivity as well as CO2 conversion rate. In order to increase CO2RR activity over HER, nanostructures have been studied deviated from the initial study on the transition metal bulk catalyst. In this talk, the nanostructured Ag, Zn, or Cu electrocatalyst be discussed for selective CO2RR activity would in terms of interaction with chemical species in the electrolyte, intermediate species, and support, and the consequential morphological or chemical changes. Moreover, Cu is one of the interesting CO2RR catalysts due to its unique capability to produce many of the hydrocarbon chemicals in addition to H2, and their nanostructures can also significantly affect the product selectivity for C2+ over C1 chemicals. We design Cu electrocatalysts to have high C2+ selectivity by increasing defect structure or interaction with supports.
Yun Jeong Hwang is a principal investigator in Korea Institute of Science and Technology (KIST) and also the adjunct professor at department of chemical and biomolecular engineering in Yonsei University. She received her Ph. D. in Chemistry department from University of California, Berkeley where she had studied photoelectrochemical water splitting with nanowire structures. After she joined KIST in 2012, her research interest has been focused on catalyst development for electrochemical CO2 reduction, solar fuel production, artificial photosynthesis system, etc. She received KIST Young Fellow award, and she is currently serving as an Associate Editor of Journal of Materials Chemistry A (Royal Society of Chemistry).