Seminar & Colloquium
[세미나: 6월 14일(금), 오전 11시] Prof. Hyacinthe Randriamahazaka, Université Paris Cité
Title
Electrochemical Impedance Spectroscopy as Tool for Elucidating Electrocatalytical Reaction Mechanisms for Energy Application
Speaker
Prof. Hyacinthe Randriamahazaka, Distinguished Professor, Université Paris Cité
* Biography
Randriamahazaka Hyacinthe is Distinguished Professor at Université Paris Cité from the national evaluation in September 2022. He is member of the Excellence Network LABEX SEAM (Science and Engineering of Advance Materials) of Université Paris Cité (http://www.labex-seam.fr). Since January 2023, he is Director of Strategic Partnerships and Prospective of PRINTUP Institute which is a new institute of Université Paris Cité dedicated to develop printed electronic for bio-medical devices by using additive manufacturing (https://printupinstitute.fr/en/home-printup-institute/). He is member of the Excellence Network LABEX SEAM (Science and Engineering of Advance Materials) of Université Paris Cité (http://www.labex-seam.fr). His major interest is materials science and electrochemistry for energy storage/conversion (supercapacitor, hydrid batteries, redox flow batteries, and nanogenerators), various electrochemical devices (electrochemical muscle, electrochemical transistors, artificial synapses, and neuromorphic devices), and additive manufacturing. He was involved in many national and international projects (USA, China, Japan, Singapore, Korea) supported by CNRS, the French Agency for Research ANR, and European Union within FP7, H2020, and Horizon Europe programmes. He has published 120 peer-reviewed scientific articles in international journals, 9 book chapters, 4 registered international patents, and more than 100 invited international conferences.
| Date | Friday, June 14th , 2024
| Time | 11:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
The electrode/electrocatalyst/electrolyte interface is extremely complex because the interactions between the phases are both chemical (short-range) and electrostatic (long-range), and the analysis of the properties of this interface remains challenging. Particularly, it is the case of the electrocatalytic processes such oxygen evolution reaction (OER), oxygen reduction reaction (ORR), and hydrogen evolution reaction (HER) which involve many electrochemical and chemical steps. During these steps, there are not only heterogeneous electron transfers but also adsorption of the intermediates and ions transfer. Herein, we analyze the electrochemical impedance spectroscopy (EIS) responses of modified electrode based on nanoparticles during the electrocatalytic water oxidation [1,2], oxygen reduction [3], and hydrogen evolution processes [4]. One observe that the determination of the transfer coefficient plays a crucial rule for analyzing the mechanism. A key challenge in heterogeneous electrocatalysis is to ensure that electrochemical responses truly represent intrinsic activity of the catalyst.
References
1. Pitchai Thangasamy, Saewoong Oh, Sanghee Nam, Hyacinthe Randriamahazaka, Il-Kwon Oh. Small 16, 2001665 (2020).
2. Pitchai Thangasamy, Rong He, Xinqi Chen, Kunpeng Yu, Hyacinthe Randriamahazaka, Zheng Chen, Hongmei Luo, Xiao-Dong Zhou, Meng Zhou. Chem. Eur. J., 29, e2023014, (2023).
3. Pitchai Thangasamy, Saewoong Oh, Sanghee Nam, Hyacinthe Randriamahazaka, Il-Kwon Oh. Applied Catalysis B: Environmental, 316, 121656 (2022).
4. Pitchai Thangasamy, Rong He, Hyacinthe Randriamahazaka, Xinqi Chen, Yizhi Zhang, Hongmei Luo, Haiyan Wang, Meng Zhou. Applied Catalysis B: Environmental, 325, 122367 (2023).
| Host | 남기태 교수(02-880-8305)