혼합 이온 및 전자 전도체-프로톤 전도성 전해질 복합 공기극을 적용한 프로토닉 세라믹 연료전지의 전기화학적 성능 평가

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 35; no. 1; pp. 48 - 55
• Main Authors: 신형식(HYEONGSIK SHIN), 이진우(JINWOO LEE), 최시혁(SIHYUK CHOI)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2024
• Subjects: 기계공학; Electrochemically active site(전기화학적 반응 면적); Peak power density(최대 전류 밀도); Protonic ceramic fuel cell(프로톤 세라믹 연료전지); Composite cathode(복합 공기극)
• ISSN: 1738-7264; 2288-7407
• DOI: 10.7316/JHNE.2024.35.1.48

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 La0.6Sr0.4Co0.2Fe0.8O3-δ(LSCF6428)-BaZr0.4Ce0.4Y0.1Yb0.1O3-δ (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.