Limits...
In situ fabrication of high-performance Ni-GDC-nanocube core-shell anode for low-temperature solid-oxide fuel cells.

Yamamoto K, Qiu N, Ohara S - Sci Rep (2015)

Bottom Line: The cermet anode effectively generated a Ni metal framework even at 500 °C with the growth of the Ni spheres.Furthermore, the macro- and microstructure of the Ni-GDC-nanocube anode were preserved before and after the power-generation test at 700 °C.Especially, the reactive {001} facets were stabled even after generation test, which served to reduce the activation energy for fuel oxidation successfully.

View Article: PubMed Central - PubMed

Affiliation: Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

ABSTRACT
A core-shell anode consisting of nickel-gadolinium-doped-ceria (Ni-GDC) nanocubes was directly fabricated by a chemical process in a solution containing a nickel source and GDC nanocubes covered with highly reactive {001} facets. The cermet anode effectively generated a Ni metal framework even at 500 °C with the growth of the Ni spheres. Anode fabrication at such a low temperature without any sintering could insert a finely nanostructured layer close to the interface between the electrolyte and the anode. The maximum power density of the attractive anode was 97 mW cm(-2), which is higher than that of a conventional NiO-GDC anode prepared by an aerosol process at 55 mW cm(-2) and 600 °C, followed by sintering at 1300 °C. Furthermore, the macro- and microstructure of the Ni-GDC-nanocube anode were preserved before and after the power-generation test at 700 °C. Especially, the reactive {001} facets were stabled even after generation test, which served to reduce the activation energy for fuel oxidation successfully.

No MeSH data available.


Arrhenius plots of the area-specific resistance (Rsp) ofthe Ni–GDC-nanocube (Ni:GDC = 65:35) anodeat 500–700 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4663492&req=5

f4: Arrhenius plots of the area-specific resistance (Rsp) ofthe Ni–GDC-nanocube (Ni:GDC = 65:35) anodeat 500–700 °C.

Mentions: Figure 4 shows Arrhenius plots of the area-specific resistance(ASR or Rsp) of the Ni–GDC-nanocube at500–700 °C (each impedance spectrum is shown inFigure S6). The activation energy(Ea =50.8 kJ mol–1) of theNi–GDC (65:35) nanocube anode is much smaller than those of theNi–GDC anode sintered at 1300 °C11. In this study, the fraction of surface diffusion appeared to be very largecompared with anodes sintered at high temperature owing to the use of 10-nm GDCnanocube particles as an oxygen-ion conductor. Therefore, we assume the apparentlylow activation energy and Rsp contributed to the increase inreactive {001} facets.


In situ fabrication of high-performance Ni-GDC-nanocube core-shell anode for low-temperature solid-oxide fuel cells.

Yamamoto K, Qiu N, Ohara S - Sci Rep (2015)

Arrhenius plots of the area-specific resistance (Rsp) ofthe Ni–GDC-nanocube (Ni:GDC = 65:35) anodeat 500–700 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663492&req=5

f4: Arrhenius plots of the area-specific resistance (Rsp) ofthe Ni–GDC-nanocube (Ni:GDC = 65:35) anodeat 500–700 °C.
Mentions: Figure 4 shows Arrhenius plots of the area-specific resistance(ASR or Rsp) of the Ni–GDC-nanocube at500–700 °C (each impedance spectrum is shown inFigure S6). The activation energy(Ea =50.8 kJ mol–1) of theNi–GDC (65:35) nanocube anode is much smaller than those of theNi–GDC anode sintered at 1300 °C11. In this study, the fraction of surface diffusion appeared to be very largecompared with anodes sintered at high temperature owing to the use of 10-nm GDCnanocube particles as an oxygen-ion conductor. Therefore, we assume the apparentlylow activation energy and Rsp contributed to the increase inreactive {001} facets.

Bottom Line: The cermet anode effectively generated a Ni metal framework even at 500 °C with the growth of the Ni spheres.Furthermore, the macro- and microstructure of the Ni-GDC-nanocube anode were preserved before and after the power-generation test at 700 °C.Especially, the reactive {001} facets were stabled even after generation test, which served to reduce the activation energy for fuel oxidation successfully.

View Article: PubMed Central - PubMed

Affiliation: Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

ABSTRACT
A core-shell anode consisting of nickel-gadolinium-doped-ceria (Ni-GDC) nanocubes was directly fabricated by a chemical process in a solution containing a nickel source and GDC nanocubes covered with highly reactive {001} facets. The cermet anode effectively generated a Ni metal framework even at 500 °C with the growth of the Ni spheres. Anode fabrication at such a low temperature without any sintering could insert a finely nanostructured layer close to the interface between the electrolyte and the anode. The maximum power density of the attractive anode was 97 mW cm(-2), which is higher than that of a conventional NiO-GDC anode prepared by an aerosol process at 55 mW cm(-2) and 600 °C, followed by sintering at 1300 °C. Furthermore, the macro- and microstructure of the Ni-GDC-nanocube anode were preserved before and after the power-generation test at 700 °C. Especially, the reactive {001} facets were stabled even after generation test, which served to reduce the activation energy for fuel oxidation successfully.

No MeSH data available.