High performance La2NiO4+δ-infiltrated (La0.6Sr0.4)0.995Co0.2Fe0.8O3–δ cathode for solid oxide fuel cells

Zhang, Xinxin; Zhang, Hui; Liu, Xingbo

doi:10.1016/j.jpowsour.2014.06.132

High performance La₂NiO_4+δ-infiltrated (La_0.6Sr_0.4)_0.995Co_0.2Fe_0.8O_3–δ cathode for solid oxide fuel cells

Journal Article · Thu Jul 10 04:00:00 EDT 2014 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2014.06.132· OSTI ID:1267274

Zhang, Xinxin ^[1]; Zhang, Hui ^[2]; ^[2]

West Virginia Univ., Morgantown, WV (United States); West Virginia University
West Virginia Univ., Morgantown, WV (United States)

In this paper, we reported our effort on improving electrochemical performance of (La_0.6Sr_0.4)_0.995Co_0.2Fe_0.8O_3–δ (LSCF) cathode in solid oxide fuel cell (SOFC) by infiltration of La₂NiO_4+δ(LNO). It is found that a porous LSCF backbone coated with LNO nanoparticles is an attractive way to acquire a noticeable decrease in the polarization resistance and activation energy of LSCF cathode, thereby showing high surface activity and enhanced oxygen transport capability. The key contributions of the LNO nanoparticles also lead to a 67% increase in peak power density and operation stability at a constant current density of 250 mA cm^–2 with a low degradation rate of 0.39% for about 500 h at 750 °C. Although extended durability of LNO-infiltrated LSCF might be concerned, based on coarsening of the LNO nanoparticles, a greatly increased power density and voltage output after a cell operation of 500 h engenders substantial confidence in the beneficial effect of LNO-infiltrated LSCF materials on cell properties. In conclusion, the enhancement of ORR kinetics could be ascribed to the increase of active surface area and active reaction regions from the heterostructured LSCF/LNO interface architecture, and/or favorable cation diffusion from LSCF to LNO.

Research Organization:: West Virginia Univ., Morgantown, WV (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: FE0009675

OSTI ID:: 1267274

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 269; ISSN 0378-7753

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
LNO
LSCF cathode
ORR kinetics
inﬁltration
solid oxide fuel cell

High performance La2NiO4+δ-infiltrated (La0.6Sr0.4)0.995Co0.2Fe0.8O3–δ cathode for solid oxide fuel cells

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High performance La₂NiO_4+δ-infiltrated (La_0.6Sr_0.4)_0.995Co_0.2Fe_0.8O_3–δ cathode for solid oxide fuel cells