Ni1-x-yMgxAlyO-ScSZ anodes for solid oxide fuel cells

Y. Shiratori, Y. Teraoka, K. Sasaki

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

Three types of cermets based on NiO-ScSZ (A), Ni0.9Mg0.1O-ScSZ (AMg) and Ni0.9Mg0.095Al0.005O-ScSZ (AMgAl) were applied as SOFC anodes. Humidified H2 and simulated biogas (CH4:CO2 = 6:4) were directly supplied to the anode side of SOFC single cell. Catalytic activities for the reforming and the electrochemical reactions were tested in a typical electrochemical measurement setup. When hydrogen (3% H2O) was supplied as a fuel, the three anodes showed almost the same voltage losses (anodic overvoltages) of ca. 40 mV at 400 mA cm- 2 at 1000 °C. However, supplying the simulated biogas, AMg and AMgAl showed smaller losses of 25 and 29 mV, respectively, than those in supplying hydrogen, whereas A showed the loss of more than 40 mV. Through this study, it was revealed that when the biogas is selected as a fuel, the electrochemical efficiency of the internal reforming SOFC is enhanced by using AMg or AMgAl as anode materials instead of A. Although the higher performances of AMg and AMgAl mainly result from the stability of small Ni particles against sintering, in addition to this effect, basic (Ni,Mg)O solid solution or MgO existing in the electrocatalysts contributes to further activity enhancement.

Original languageEnglish
Pages (from-to)1371-1380
Number of pages10
JournalSolid State Ionics
Volume177
Issue number15-16
DOIs
Publication statusPublished - Jun 15 2006

All Science Journal Classification (ASJC) codes

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

Fingerprint

Dive into the research topics of 'Ni<sub>1-x-y</sub>Mg<sub>x</sub>Al<sub>y</sub>O-ScSZ anodes for solid oxide fuel cells'. Together they form a unique fingerprint.

Cite this