Fuel flexibility in power generation by solid oxide fuel cells

K. Eguchi, H. Kojo, T. Takeguchi, R. Kikuchi, Kazunari Sasaki

Research output: Contribution to journalArticle

199 Citations (Scopus)

Abstract

Power generation characteristics of solid oxide fuel cell (SOFC) with internal steam reforming of hydrocarbons were investigated. Steam reforming reaction over a Ni-YSZ cermet catalyst attained almost the equilibrium conversion and selectivity in the fixed bed reactor at 1000 °C. The conversion of internal reforming of hydrocarbons was incomplete because of the limited contact time with a thick layer of the Ni cermet electrode. Therefore, the fuel cell supplied with pre-reforming gas to the anode always gave rise to a lower terminal voltage because of the insufficient conversion of fuel compared with that supplied with post-reforming gas at a given current density. Methane internal reforming proceeded without deterioration with time, whereas the power generation with ethane and ethylene suffered from carbon deposition even at high steam-to-carbon ratio. Carbon deposition region and equilibrium partial pressure of oxygen in the C-H-O diagram were estimated from the thermodynamic data. The effect of the gas composition in the power generation characteristics, especially, difference in reactivity between H2 and CO, was investigated. The H2-H2O and CO-CO2 fuel systems led to almost the same open circuit voltage at the same H2/H2O and CO/CO2 ratios at 1000 °C, as expected from the thermodynamic equilibrium. The output voltage in a discharge condition was always higher for H2-H2O than for CO-CO2 at every current density.

Original languageEnglish
Pages (from-to)411-416
Number of pages6
JournalSolid State Ionics
Volume152-153
DOIs
Publication statusPublished - Dec 1 2002

Fingerprint

solid oxide fuel cells
Reforming reactions
Solid oxide fuel cells (SOFC)
steam
Power generation
Carbon Monoxide
flexibility
Cermet Cements
carbon
hydrocarbons
fuel systems
Carbon
current density
Gases
Steam reforming
Hydrocarbons
gas composition
electric potential
thermodynamic equilibrium
yttria-stabilized zirconia

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Fuel flexibility in power generation by solid oxide fuel cells. / Eguchi, K.; Kojo, H.; Takeguchi, T.; Kikuchi, R.; Sasaki, Kazunari.

In: Solid State Ionics, Vol. 152-153, 01.12.2002, p. 411-416.

Research output: Contribution to journalArticle

Eguchi, K. ; Kojo, H. ; Takeguchi, T. ; Kikuchi, R. ; Sasaki, Kazunari. / Fuel flexibility in power generation by solid oxide fuel cells. In: Solid State Ionics. 2002 ; Vol. 152-153. pp. 411-416.
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