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Received March 1, 2011
Accepted March 30, 2011
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직접탄소 연료전지용 전해질 제조 및 직접탄소 연료전지 특성 평가
Fabrication of Electrolyte for Direct Carbon Fuel Cell and Evaluation of Properties of Direct Carbon Fuel Cell
Seuk-Hoon Pi
Min-Je Cho1
Jong-Won Lee1
Seung-Bok Lee1
Tak-Hyoung Lim1†
Seok Joo Park1
Rak-Hyun Song1
Dong-Ryul Shin1
한국과학기술원 신소재공학부, 305-701 대전시 유성구 구성동 373-1 1한국에너지기술연구원 연료전지 연구단, 305-343 대전시 유성구 장동 71-2
Department of Material Science and Engineering, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea 1Fuel Cell Research Center, Korea Institute of Energy Research, 71-2 Jang-Dong, Yuseong-gu, Daejeon 305-343, Korea
ddak@kier.re.kr
Korean Chemical Engineering Research, December 2011, 49(6), 786-789(4), NONE Epub 28 November 2011
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Abstract
본 연구에서는 고체산화물연료전지에서 사용되고 있는 전해질의 직접탄소연료전지로의 적용가능성을 평가하기 위해 YSZ 전해질의 특성을 평가하였다. 전해질 층은 진공 슬러리 코팅 법을 사용하여 연료극 지지체위에 형성하였으며, 코팅 후 1,400℃ 에서 5시간 동안 열처리하여 미세조직, 가스투과도 및 이온 전도도 측정을 통해 직접탄소연료전지로의 적용가능성을 확인하였다. YSZ 전해질은 얇고 치밀한 층을 형성하였으며 낮은 가스 투과도 값을 나타내었다. 이와 같은 결과를 바탕으로 직접탄소 연료전지에 YSZ 전해질을 적용하였으며, 단위전지를 제작하여 800 ℃에서 성능평가를 수행하였다.
In order to estimate the possibility of applying electrolytes generally used in solid oxide fuel cells(SOFCs) to direct carbon fuel cells(DCFCs), properties of YSZ(yttria stabilized zirconia)electrolyte were evaluated. In this study, vacuum slurry coating method was adapted to coat thin layer on anode support substrate. After sintering the electrolyte at 1400℃ for 5hrs, microstructure was analyzed by using SEM image. Also, gas permeability and ionic conductivity were measured to find out the potential possibility of electrolyte for DCFCs. The YSZ electrolyte represented dense coating layer and low gas permeability value. The ionic conductivity of YSZ electrolyte was high over 800℃ . After measurement of the electrolyte properties, direct carbon fuel cell was fabricated and its performance was measured at 800℃ .
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