Performance and durability of Ni-coated YSZ anodes for intermediate temperature solid oxide fuel cells

Sun Dong Kim, Hwan Moon, Sang Hoon Hyun, Jooho Moon, Joosun Kim, Hae Weon Lee

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

NiO-coated YSZ composite powders were synthesized through the Pechini process in order to improve the performance and durability of SOFC anodes. Their microstructures and electrical properties have been investigated with thermal and redox cycling tests. The coverage of NiO crystals on the YSZ surface could be modulated by controlling the composition of the reaction mixture and the ratio of NiO and YSZ. Ni-YSZ electrodes were manufactured by sintering the die-pressed NiO-YSZ pellet at 1400 °C for 3 h, followed by reducing it to 800 °C under hydrogen atmosphere. The anode made from NiO/YSZ composite powder, which has a high homogeneity and plenty of contact sites between Ni and YSZ, has an excellent tolerance against thermal and redox cycling. The maximum power density of a single cell made from NiO/YSZ composite powder was 0.56 W cm- 2 at 800 °C in reactive gases of humidified hydrogen and air. It can be concluded that the functional NiO/YSZ composite powder will suppress the degradation of anodes and enhance the long-term and redox stability of the unit cell at elevated temperatures.

Original languageEnglish
Pages (from-to)931-938
Number of pages8
JournalSolid State Ionics
Volume177
Issue number9-10
DOIs
Publication statusPublished - 2006 Mar 31

All Science Journal Classification (ASJC) codes

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

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