Carbon doped MO-SDC material as an SOFC anode
2007 (English)In: Journal of Power Sources, ISSN 0378-7753, Vol. 165, no 1, 82-86 p.Article in journal (Refereed) Published
Oxide mixtures MO-SDC, M=Cu, Ni, Co, SDC=Ce0.9Sm0.1O1.95 were synthesized by employing a citrate/nitrate combustion technique. Two kinds of Carbon materials, activated carbon (AC) and vapor grown carbon fiber (VGCF) were homogeneously dispersed into the MO-SDC. The materials can be used as anodes to fabricate single cells using a uniaxial die-press method. The sintering temperature was studied to optimize cell performance. Experimental results showed that cells sintered at 700 degrees C had better performance. When the temperature was above 750 degrees C, the cells were severely distorted, and cannot be tested. Compared with the basic MO-SDC anode, AC and VGCF improve the solid oxide fuel cell (SOFC) anode properties, due to a change of the microstructures of the anode materials which enhance their electron conductivity. Single cell performances were evaluated by I-V measurements, and when 1.25 wt.%VGCF was introduced into the MO-SDC by ball-milling, termed: 1.25 wt.%VGCF-MO-SDC, the 1.25 wt.%VGCF-MO-SDC anode material could achieve the highest power density of up to 0.326 W cm(-2) with H-2 as fuel. The calcination temperature of the MO-SDC dry gel also strongly influenced the electrochemical performance of the 1.25 wt.%VGCF-MO-SDC material. XRD spectra for each calcined temperature and the I-V measurement both suggest that calcinations at 550 degrees C for 1 h are suitable. 1.0 wt.%AC-MO-SDC and 1.25 wt.%VGCF-MO-SDC have similar performance when the cell was fed in methanol/3%H2O, and the corresponding power density was up to 0.253 W cm(-2). Traces of carbon were found in the off-gases.
Place, publisher, year, edition, pages
2007. Vol. 165, no 1, 82-86 p.
citrate/nitrate combustion technique, carbon, anode catalyst, methanol, oxide fuel-cells, ceria, oxidation
IdentifiersURN: urn:nbn:se:kth:diva-16471DOI: 10.1016/j.jpowsour.2006.11.079ISI: 000245093800011ScopusID: 2-s2.0-33846829884OAI: oai:DiVA.org:kth-16471DiVA: diva2:334513
QC 201005252010-08-052010-08-05Bibliographically approved