Oxidation and steam reforming of CH{sub 4} on Ni and Fe anodes under low humidity conditions in solid oxide fuel cells
- National Inst. of Materials and Chemical Research, Tsukuba, Ibaraki (Japan)
Oxidation and steam reforming of CH{sub 4} on Ni/YSZ and Fe/YSZ cermet anodes were examined, primarily under the condition of 0 {le} H{sub 2}O/CH{sub 4} {le} 1. In the CH{sub 4} + H{sub 2}O fuel system, steam reforming occurs on anodes, generating CO and H{sub 2}. The steam reforming activity of CH{sub 4} on Ni/YSZ was much higher than on Fe/YSZ at open circuit. The anodic polarization curves of an Ni/YSZ cermet electrode, both in dry CH{sub 4} and CH{sub 4} + H{sub 2}O fuel systems, could be divided into two parts; one due to direct oxidation of C in the low overvoltage region, the other due to oxidation of H{sub 2} and/or CO at higher overvoltages. On the other hand, the anodic polarization curves of an Fe/YSZ cermet electrode in CH{sub 4} fuel showed behavior different from that for Ni/YSZ in the dry CH{sub 4} or the CH{sub 4}-H{sub 2}O fuel systems. The polarization curve in the dry CH{sub 4} fuel system showed multiple reaction slopes, while that in the CH{sub 4}-H{sub 2}O fuel system showed only one slope. A thermochemical calculation was made to estimate the anode surface state and the equilibrium oxygen partial pressure between the anode/YSZ interface and the gas phase.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 251048
- Journal Information:
- Journal of the Electrochemical Society, Vol. 143, Issue 4; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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