| 학회 |
한국재료학회 |
| 학술대회 |
2014년 봄 (05/15 ~ 05/16, 창원컨벤션센터) |
| 권호 |
20권 1호 |
| 발표분야 |
C. 에너지/환경 재료(Energy and Environmental Materials) |
| 제목 |
MEASUREMENT OF HYDROGEN CHEMICAL POTENTIAL IN YTTRIA DOPED BARIUM CERATE (BCY) ELECTROLYTE OF ANODE-SUPPORTED PROTONIC CERAMIC FUEL CELLS |
| 초록 |
Yttria doped barium cerate (BCY) electrolyte, Ni + BCY anode supported protonic ceramic fuel cells were fabricated with Pt reference electrodes embedded in a thin (~ 40 microns) electrolyte layer. The embedded electrodes function as selective probes exchanging only electrons with the BCY so that the voltage measurements ( ΔV ) using the embedded probes through the electrolyte correspond to a change in the reduced negative electrochemical potential of electrons ( Δφ ). Using this method, the corresponding change in hydrogen chemical potential ( ΔμH2 ) or partial pressure of hydrogen ( ΔpH2 ) was determined on the basis of the local equilibrium assumption, allowing us to investigate ionic and electronic transport properties through the BCY electrolyte. The results indicate that the change mainly occurs across the middle electrolyte region while the electrolyte regions close to the anode and the cathode showed very small variation. The present work revealed that the BCY electrolyte consists of three major parts with different transport properties; 1) mixed ionic-electronic conduction in the electrolyte close to the anode side (reducing atmosphere), 2) predominantly ionic conduction in the middle region, 3) mixed ionic-hole conduction in the electrolyte close to the cathode side (oxidizing atmosphere). |
| 저자 |
Myung Geun Jung, Hyung-Tae Lim
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| 소속 |
Changwon National Univ. |
| 키워드 |
Protonic ceramics fuel cells; Chemical potential; Reference electrodes; Yttria doped barium cerate
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| E-Mail |
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