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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.


Microscope images of GDC samples.GDC samples prepared by the chemical-reduction method (a) without GDCnanocube dispersion and (b) with 2.66 mL of a GDCdispersion (Ni:GDC = 65:35). (c) (Left) TEMand (Right) HR-TEM images of (b).
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f1: Microscope images of GDC samples.GDC samples prepared by the chemical-reduction method (a) without GDCnanocube dispersion and (b) with 2.66 mL of a GDCdispersion (Ni:GDC = 65:35). (c) (Left) TEMand (Right) HR-TEM images of (b).

Mentions: As shown in Fig. 1a, the sample obtained by chemical reductionin a solution without GDC dispersion (metallic Ni sample) had a sphericalmorphology, with particle diameters of 100–200 nm. On theother hand, the Ni–GDC-nanocube composite sample(Ni:GDC = 65:35) also had a spherical morphology withparticle diameters of 200–300 nm, which are slightly largerthan the diameters of the metallic Ni particles (Fig. 1b).Furthermore, the microstructure of the Ni–GDC-nanocube composite samplewas confirmed by detailed observation with transmission electron microscopy (TEM).In Fig. 1c, the spherical composite particles with diametersof 200–300 nm had a very fine nanostructure on the surface,and high-resolution (HR)-TEM observation identified that the nanostructurecorresponded to the characteristic (002) and (111) lattice fringes ofCeO2. These results indicate that the Ni–GDC-nanocubecomposite samples had a core–shell morphology, which consisted of ametallic Ni core covered with GDC-nanocube fine particles measuring10 nm in size. Many researchers have reported synthesis of metallic Niparticles by the chemical-reduction method; the reaction mechanism is summarized asfollows121314:


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)

Microscope images of GDC samples.GDC samples prepared by the chemical-reduction method (a) without GDCnanocube dispersion and (b) with 2.66 mL of a GDCdispersion (Ni:GDC = 65:35). (c) (Left) TEMand (Right) HR-TEM images of (b).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Microscope images of GDC samples.GDC samples prepared by the chemical-reduction method (a) without GDCnanocube dispersion and (b) with 2.66 mL of a GDCdispersion (Ni:GDC = 65:35). (c) (Left) TEMand (Right) HR-TEM images of (b).
Mentions: As shown in Fig. 1a, the sample obtained by chemical reductionin a solution without GDC dispersion (metallic Ni sample) had a sphericalmorphology, with particle diameters of 100–200 nm. On theother hand, the Ni–GDC-nanocube composite sample(Ni:GDC = 65:35) also had a spherical morphology withparticle diameters of 200–300 nm, which are slightly largerthan the diameters of the metallic Ni particles (Fig. 1b).Furthermore, the microstructure of the Ni–GDC-nanocube composite samplewas confirmed by detailed observation with transmission electron microscopy (TEM).In Fig. 1c, the spherical composite particles with diametersof 200–300 nm had a very fine nanostructure on the surface,and high-resolution (HR)-TEM observation identified that the nanostructurecorresponded to the characteristic (002) and (111) lattice fringes ofCeO2. These results indicate that the Ni–GDC-nanocubecomposite samples had a core–shell morphology, which consisted of ametallic Ni core covered with GDC-nanocube fine particles measuring10 nm in size. Many researchers have reported synthesis of metallic Niparticles by the chemical-reduction method; the reaction mechanism is summarized asfollows121314:

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.