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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.


V–I and P–I curves of singlecells.(a) Ni–GDC-nanocube anode(Ni:GDC = 65:35) and (b) NiO-GDC anodeprepared by aerosol process and sintering at1300 °C. The cell-performance tests were performedat 600 °C.
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f2: V–I and P–I curves of singlecells.(a) Ni–GDC-nanocube anode(Ni:GDC = 65:35) and (b) NiO-GDC anodeprepared by aerosol process and sintering at1300 °C. The cell-performance tests were performedat 600 °C.

Mentions: After screen printing of the Ni–GDC-nanocube(Ni:GDC = 65:35) paste, the solid-oxide single fuel cellswere directly examined to investigate the power-generation properties attemperatures between 500 and 700 °C. Thevoltage–current (V–I) andpower–current (P–I) curves are shown in Figure S2. Power generation was detectedeven at 500 °C, which indicates that the anode structure forelectrical-power generation and collection was successfully fabricated without anysintering of the anode material. Furthermore, higher power densities were obtainedat higher operating temperatures. The maximum power densities were 25, 51, 97, 158,and 224 mW·cm–2 at 500, 550, 600,650, and 700 °C, respectively. When the power-generationproperty at 600 °C was compared with that of a NiO-GDC anodethat was prepared by an aerosol process followed by sintering at1300 °C151617, theNi–GDC-nanocube (Ni:GDC = 65:35) anode showed amaximum power density that was 1.8 times higher (Fig 2). Inaddition, the Ni–GDC-nanocube cermet anode had very high performancethat was comparable to that of a NiO–GDC-nanocube compo site anodefabricated by an aerosol process and sintering at1100 °C11.


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)

V–I and P–I curves of singlecells.(a) Ni–GDC-nanocube anode(Ni:GDC = 65:35) and (b) NiO-GDC anodeprepared by aerosol process and sintering at1300 °C. The cell-performance tests were performedat 600 °C.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: V–I and P–I curves of singlecells.(a) Ni–GDC-nanocube anode(Ni:GDC = 65:35) and (b) NiO-GDC anodeprepared by aerosol process and sintering at1300 °C. The cell-performance tests were performedat 600 °C.
Mentions: After screen printing of the Ni–GDC-nanocube(Ni:GDC = 65:35) paste, the solid-oxide single fuel cellswere directly examined to investigate the power-generation properties attemperatures between 500 and 700 °C. Thevoltage–current (V–I) andpower–current (P–I) curves are shown in Figure S2. Power generation was detectedeven at 500 °C, which indicates that the anode structure forelectrical-power generation and collection was successfully fabricated without anysintering of the anode material. Furthermore, higher power densities were obtainedat higher operating temperatures. The maximum power densities were 25, 51, 97, 158,and 224 mW·cm–2 at 500, 550, 600,650, and 700 °C, respectively. When the power-generationproperty at 600 °C was compared with that of a NiO-GDC anodethat was prepared by an aerosol process followed by sintering at1300 °C151617, theNi–GDC-nanocube (Ni:GDC = 65:35) anode showed amaximum power density that was 1.8 times higher (Fig 2). Inaddition, the Ni–GDC-nanocube cermet anode had very high performancethat was comparable to that of a NiO–GDC-nanocube compo site anodefabricated by an aerosol process and sintering at1100 °C11.

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.