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프로토닉 세라믹 연료전지를 위한 적층형 구조의 삼중 이온 및 전자 전도체 YBa0.5Sr0.5Co1.5Fe0.5O5+δ 양극의 전기화학적 성능 평가
조인혁(Inhyeok Cho),최시혁(Sihyuk Choi) 한국세라믹학회 2021 세라미스트 Vol.24 No.4
Protonic ceramic fuel cells (PCFCs) have receiving huge attention as a promising energy conversion device because of their high conversion efficiency, lack of fuel dilution, and high ionic conductivity at intermediate temperature regime (400 ∼ 600 oC). Although this fuel cell system can effectively solve the main obstacle for the commercialization of conventional solid oxide fuel cells, electrochemical performance is currently limited by the cathodic polarization due to insufficient catalytic activity. To overcome this issue, layered perovskite materials, PrBa0.5Sr0.5Co1.5Fe0.5O5+δ, have been discovered as triple ionic and electronic conductor, which enables to simultaneously conduct H+/O2-/e-. Despite great advantages, there is large gap in the thermal expansion coefficient (TEC) between the cathode and electrolyte. Herein, we developed a new triple conducting cathode material, YBa0.5Sr0.5Co1.5Fe0.5O5+δ (YBSCF) to minimize TEC while maintaining the high electro-catalytic activity with excellent hydration properties. Structural analysis, hydration properties, and electrochemical performances of YBSCF cathode were investigated. In particular, the peak power density of YBSCF cathode based on BaZr0.4Ce0.4Y0.1Yb0.1O3-δ (BZCYYb4411) electrolyte attained 0.702 W cm-2 at 600 oC. Moreover, power output is fairly stable for 300 h without observable degradation by applying a constant voltage of 0.7 V at 600 oC.
혼합 이온 및 전자 전도체-프로톤 전도성 전해질 복합 공기극을 적용한 프로토닉 세라믹 연료전지의 전기화학적 성능 평가
신형식(HYEONGSIK SHIN),이진우(JINWOO LEE),최시혁(SIHYUK CHOI) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.1
The electrochemically active site of mixed ionic and electronic conductor (MIEC) as a cathode material is restricted to the triple phase boundary in protonic ceramic fuel cells (PCFCs) due to the insufficient of proton-conducting properties of MIEC. This study primarily focused on expanding the electrochemically active site by 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> (LSCF6428)-BaZr<SUB>0.4</SUB>Ce<SUB>0.4</SUB>Y<SUB>0.1</SUB>Yb<SUB>0.1</SUB>O<SUB>3-δ</SUB> (BZCYYb4411) composite cathode. The electrochemical properties of the composite cathode were evaluated using anode-supported PCFC single cells. In comparison to the LSCF6428 cathode, the peak power density of the LSCF6428-BZCYYb4411 composite cathode is much enhanced by the reduction in both ohmic and non-ohmic resistance, possibly due to the increased electrochemically active site.
A rechargeable Aqueous Zn-CO₂ Battery for Energy Storage and Highly Efficient CO₂ Fization
Yejin Yang(양예진),Arim Seong(성아림),Sewon Pyo(표세원),Hyojea Hwang(황효제),Sangwook Joo(주상욱),Jinkyung Oh(오진경),Hyoi Jo(조효이),Donghwi Jeong(정동휘),Hyunmin Kim(김현민),Minseo Kim(김민서),Nayeon Ko(고나연),Sihyuk Choi(최시혁),Gun 한국에너지기후변화학회 2020 한국에너지기후변화학회 학술대회 Vol.2020 No.11