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중·저온형 고체산화물 연료전지 공기극의 적용을 위한 Sr이 치환된 이중층 페로브스카이트 기반 복합공기극 물질의 분말 크기 및 열 사이클에 따른 전기화학특성 분석

Electrochemical Investigation in Particle Size and Thermal Cycles of Sr Doped Layered Perovskite Based Composite Cathodes for Intermediate Temperature-operating Solid Oxide Fuel Cell

김정현
한국전기화학회 (The Korean Electrochemical Society)|2011.08|전기화학회지 (Journal of the Korean Electrochemical Society)|제14권 제3호|pp. 176-183

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참고문헌

키워드

CathodeSolid oxide fuel cell (SOFC)Area specific resistance (ASR)Layered perovskiteComposite cathode
주제분류화학

초록

본 연구에서는 Sr이 치환된 이중층 페로브스카이트(SmBa_(0.5)Sr_(0.5)Co_(2)O_(5+δ), SBSCO)와 전해질 물질로 사용되는 Ce_(0.9)Gd_(0.1)O_(2-δ) (CGO91)을 기반으로 한 중·저온형 고체산화물 연료전지 (ITSOFC)복합공기극의 분말 크기와 열 사이클에 대한 전기화학특성을 연구하였다. 복합공기극의모체가 되는 SBSCO에 CGO91물질을 이용하여 면적비저항을 확인 한 결과 약 0.54~9.04 μm의분말 크기를 보이는 SBSCO와 0.4~42 μm의 분말 크기를 보인 CGO91이 각각 50 wt%로 구성된 SBSCO : 50 복합공기극이 600 및 700℃에서 약 0.102 및 0.013 Ωcm^2의 우수한 면적비저항을 가지는 것을 확인 하였으며 상대적으로 분말 크기가 큰 CGO91 분말을 이용한 두 개의공기극의 경우 700℃에서 약 0.260 Ωcm^2 와 0.055 Ωcm^2의 특성을 보여주었다. 10회에 걸친열 사이클실험을 통하여 SBSCO : 50의 면적비저항은 0.0193 Ωcm^2 에서 0.094 Ωcm^2 로 증가하였으며 7회 이후의 면적비저항은 일정하게 유지됨을 확인하였다.

Abstract

The electrochemical characteristics from various particle sizes of Ce_(0.9)Gd_(0.1)O_(2-δ) (CGO91) in composite cathode comprised of the samarium-strontium doped layered perovskite (SmBa_(0.5)Sr_(0.5)Co_(2)O_(5+δ))and CGO91 have been investigated for possible application as a cathode material for an intermediate temperature-operating solid oxide fuel cell (IT-SOFC). The area specific resistances (ASRs)of composite cathodes with CGO91 having smaller particle size (0.4~42 μm) and SBSCO of 1 : 1ratio (50wt% SBSCO and 50 wt% CGO91, SBSCO: 50) give the lowest ASR of 0.10Ωcm^2 at 600℃and 0.013Ωcm^2 at 700℃. However, composite cathodes with having relatively bigger CGO91particle size show the two times higher ASR results than those of SBSCO : 50. From the 10times thermal cycles in SBSCO : 50, the ASRs of SBSCO : 50 increased from 0.0193 Ωcm^2 to 0.094 Ωcm^2 at 700℃, however, the ASR value was maintained after 7 times of thermal cycling.

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