KAIST · Materials Science
Kang Taek Lee 교수의 연구실은 고온 전기화학 장치, 특히 고체 산화물 연료전지(SOFC) 및 고체 산화물 전기분해기(SOEC)의 핵심 소재인 전극 및 전해질 재료의 개발에 중점을 두고 있습니다. 나노구조 제어, 복합 전극 설계, 그리고 마이크로파 소결과 같은 혁신적 공정 기술을 접목하여 높은 전기화학적 활성도와 내구성을 동시에 확보한 신소재를 지속적으로 개발하고 있습니다. 특히, 비니켈 기반 전극, 산화물-탄소 복합소재, 그리고 산화물-탄소 나노구조의 설계를 통해 에너지 변환 및 저장 장치의 성능을 극대화하는 데 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Protonic ceramic electrochemical cells (PCECs) have attracted considerable attention owing to their ability to reversibly convert chemical fuels into electricity at low temperatures below 600 °C. However, extreme sintering conditions during conventional convection-based heating induce critical problems for PCECs such as nonstoichiometric electrolytes and microstructural coarsening of the electrodes, leading to performance deterioration. Therefore, we fabricated PCECs via a microwave-assisted sin
Layered perovskite SrGdNixMn1–xO4±δ phases were evaluated as new ceramic anode materials for use in solid oxide fuel cells (SOFCs). Hydrogen temperature-programmed reduction (H2-TPR) analysis of the SrGdNixMn1–xO4±δ (x = 0.2, 0.5, and 0.8) materials revealed that significant exsolution of Ni nanoparticles occurred in SrGdNi0.2Mn0.8O4±δ (SGNM28) in H2 at over 650 °C. Consistently, the SGNM28 on the LSGM electrolyte showed low electrode polarization resistance (1.79 Ω cm2) in H2 at 800 °C. Moreove
Abstract Robust oxide electrodes with high activity and durability have attracted significant attention as alternatives for Ni‐based cathodes in high‐temperature solid oxide electrolysis cells (SOECs). Noncoking La(Sr)Cr(Mn)O 3 (LSCM)‐based oxide cathodes have shown promise as durable ceramic cathodes; however, they suffer from low electrocatalytic activities in electrochemical CO 2 reduction. In this study, a dual‐phase composite electrode consisting of LSCM and Ce(Mn, Fe)O 2 (CMF) is developed
A novel in situ co-assembled nanocomposite LSM-Bi1.6 Er0.4 O3 (ESB) (icn-LSMESB) was obtained by conjugated wet-chemical synthesis. It showed an enhancement of the cathode polarization at 600 °C by >140 times relative to conventional LSM-Y0.08 Zr0.84 O1.92 (YSZ) cathodes and exceptional solid oxide fuel cell (SOFC) performance of >2 W cm(-2) below 750 °C. This demonstrates that this novel cost-effective and broadly applicable process provides new opportunities for performance enhancement of ener
The rational design and exploration of the metal oxide-carbon composite are greatly desired for enhanced supercapacitor application. Herein, we develop a novel Bi2MoO6 and carbon sphere hybrid material as a supercapacitor electrode via a simple solvothermal process. The microstructural analysis of the carbon sphere@Bi2MoO6 reveals that the 10 nm thick Bi2MoO6 nanopetals are consistently anchored on the carbon spheres surface, forming a 3-dimensional nanoarchitecture. The carbon sphere@Bi2MoO6 el
Highly conductive Dy and Y co-doped bismuth oxides combined with La<sub>0.8</sub>Sr<sub>0.2</sub>MnO<sub>3−δ</sub>significantly enhanced the ORR and OER as oxygen electrodes for reversible SOCs.
Solid oxide cells (SOCs) are mutually convertible energy devices capable of generating electricity from chemical fuels including hydrogen in the fuel cell mode and producing green hydrogen using electricity from renewable but intermittent solar and wind resources in the electrolysis cell mode. An effective approach to enhance the performance of SOCs at reduced temperatures is by developing highly active oxygen electrodes for both oxygen reduction and oxygen evolution reactions. Herein, highly co
The Sr segregation at the surface of a perovskite La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3-δ</sub> (LSCF) oxygen electrode is detrimental to the electrochemical performance and durability of energy conversion devices such as solid oxide fuel cells. However, a quantitative correlation of degradation of the oxygen surface exchange kinetics with Sr precipitation formation at the LSCF surface is not clearly understood yet. Herein, the correlation of the time-dependent
