신소재공학과

Seminar

Extra Form
Date 20180725

■ Title             : Dynamic Control and in-situ Measurements of Oxygen Nonstoichiometry and Phase of Layered Cuprate-based Thin Films by Electrochemical Pumping

 

■ Speaker         :  Dr. Chang Sub Kim 


■ Date and Time
 :  7/25 (Wed) 1:30 PM 

 

■ Venue           :  Applied Engineering Buliding (W1-1) Seminar Room #2

 

■ H o s t           :  Prof. Woo Chul Jung

 

■ Abstract :    

Three major criteria are essential for a good solid oxide fuel cell (SOFC) electrode: 1) mixed ionic and electronic conductivity, 2) electrocatalytic activity towards oxygen surface exchange reaction, and 3) chemical and chemo-mechanical stability. Conventional method of assessing these electro-chemo-mechanical properties requires doping different concentrations of aliovalent cations and/or controlling atmosphere. These, however, are constrained by solubility limits of dopants, the range of oxygen partial pressures readily experimentally achievable, and require knowledge of the applicable defect chemical model. In this study, we control and measure oxygen defect types, concentrations, and phases in promising rare earth cuprate (RE2CuO4: RE = rare earth) SOFC cathode materials by electrochemical pumping of oxygen through an yttria-stabilized zirconia supporting electrolyte. These layered perovskites can incorporate both oxygen interstitials and vacancies, as well as two different crystal structures – T and T’ – depending on the Cu-O coordination, thereby broadening the range of investigations. Oxygen nonstoichiometry values and crystal structures are determined by in-situ measurement of chemical capacitance and x-ray diffraction, respectively, and are correlated with surface kinetics, in-plane conductivities, ionic diffusivities, and chemo-mechanical properties.


List of Articles
No. Category Subject Author Date Views
Notice Regular 6/4 (Tue) Prof. SangBum Kim (Dept. of MSE, SNU) ADMINI 2019.05.31 206
Notice Regular 5/28 (Tue) Prof. Seok Su Sohn (Dept. of MSE, Korea Univ.) ADMINI 2019.05.24 229
Notice Regular 5/21 (Tue) Emeritus Prof. Joong Keun Park (Dept. of MSE, KAIST) ADMINI 2019.05.17 241
Notice Regular 5/17 (Tue) Prof. Su-Hyun Gong (Dept. of Physics, Korea Univ.) ADMINI 2019.05.10 443
Notice Special 5/7 (Tue) Prof. Dr. -ing. Dierk Raabe (MPIE) ADMINI 2019.04.30 397
Notice Regular 4/30 (Tue) Prof. Min Hyuk Park (School of MSE, Pusan National Univ.) ADMINI 2019.04.25 461
Notice Regular 4/23 (Tue) Prof. Seungwu Han (Dept. of MSE, SNU) ADMINI 2019.04.19 227
278 Regular 11/6 (Tue) Prof. Dongchan Jang (KAIST NQE) ADMINI 2018.11.02 531
277 Special 11/2 (Fri) Dr. Sungbong Park (Intel Corporation) ADMINI 2018.10.30 739
276 Regular 10/30 (Tue) Dr. Myung-Il Park (Korea Technology Finance Corporation) ADMINI 2018.10.26 369
275 Regular 10/23 (Tue) Dr. Sang-Soo Han (H&P International Patent & Law Office) ADMINI 2018.10.19 367
274 Regular 10/2 (Tue) Prof. Dohwan Kim (Hanyang Univ.) ADMINI 2018.10.01 525
273 Regular 9/18 (Tue) Prof. Seong Jun Kang (Kyung Hee Univ.) ADMINI 2018.09.17 618
272 Regular 9/11 (Tue) Dr. Byeongdu Lee (Argonne National Laboratory) ADMINI 2018.09.07 725
271 Regular 9/4 (Tue) Prof. Kibum Kang (Department of MSE, KAIST) ADMINI 2018.09.03 1231
270 Regular 8/28 (Tue) Prof. Kyung-Min Kim (Department of MSE, KAIST) ADMINI 2018.08.24 1042
269 Special 8/24 (Fri) Prof. Joel W. Ager III (UC Berkeley, Lawrence Berkeley National Laboratory) file ADMINI 2018.08.20 588
268 Special 8/23 (Thu) Prof. Jeehwan Kim (MIT, USA) file ADMINI 2018.08.20 1164
267 Special 8/23 (Thu) Prof. YANGUANG LI (Soochow University) file ADMINI 2018.08.20 387
» Special 7/25 (Wed) Dr. Chang Sub Kim (Department of MSE, MIT) ADMINI 2018.07.24 650
265 Special 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz, Austria) file ADMINI 2018.07.09 586
264 Regular 6/5 (Tue) Prof. Sunghwan Lee (Baylor University) ADMINI 2018.06.05 633
263 Regular 5/29 (Tue) Prof. Sang Ho Oh (Yonsei Univ. College of Medicine) ADMINI 2018.05.29 607
262 Regular 5/15 (Tue) Prof. Myung Gil Kim (Dept. of Chemistry, Chung-Ang Univ.) ADMINI 2018.05.15 843
261 Regular 5/8 (Tue) Prof. Ju-Young Kim (UNIST MSE) ADMINI 2018.05.09 737
260 Regular 5/1 (Tue) Prof. Duk-Yong Yoon (KAIST MSE) ADMINI 2018.04.30 1272
259 Regular 4/24 (Tue) Kyeong Ho Chang (CEO, Innox Advanced Materials) ADMINI 2018.04.23 757
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