| 학회 |
한국재료학회 |
| 학술대회 |
2011년 봄 (05/26 ~ 05/27, 제주 휘닉스 아일랜드) |
| 권호 |
17권 1호 |
| 발표분야 |
C. Energy and the Environment Technology(에너지 및 환경재료) |
| 제목 |
Duo-functional hydrogen electrodes of solid oxide electrolysis cell for coelectrolysis of steam and carbon dioxide application |
| 초록 |
A novel duo-functional hydrogen electrode is created by impregnating a conventional hydrogen electrode which is nickel-yttria stabilised zirconia (Ni-YSZ) with a composite of noble metal and gadolinium doped ceria (GDC). Ceria in the impregnating composition is aimed to suppress the Ni-oxidation problem in steam electrolysis mode while noble metal is aimed to facilitate reverse water gas shift reaction (RWGS) to form carbon monoxide by reacting produced hydrogen with steam to complete coelectrolysis application for syngas production. The electrochemical performance of the hydrogen electrode is measured at 800oC in H2O/H2 ratio of 70/30, using reference electrode and it is found that the noble metal-GDC impregnating significantly improves the performance of Ni-YSZ electrode. The performance of noble metal-GDC impregnated Ni-YSZ electrode is compared when rhodium (Rh) and platinum (Pt) are the noble metal. The performance between solid oxide electrolysis cell (SOEC) and solid oxide fuel cell (SOFC) mode was also closer to symmetrical behaviour which is ideal for reversible operation. The performance order is as followed: composite Ni-GDC ＞ 0.5%Rh-GDC impregnated Ni-YSZ ＞ 0.5%Pt-GDC impregnated Ni-YSZ ＞ GDC impregnated Ni-YSZ ＞ composited Ni-YSZ. The test of the catalytic activity of Rh-GDC shows that noble metal-GDC is capable for RWGS at 800oC, corresponding to the calculated equilibrium gas compositions. |
| 저자 |
P.Kim-Lohsoontorn, Joongmyeon Bae
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| 소속 |
KAIST |
| 키워드 |
hydrogen electrode; solid oxide electrolysis cell; coelectrolysis
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| E-Mail |
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