16 research outputs found

Infiltrated La0.4Sr0.4Fe0.03Ni0.03Ti0.94O3 based anodes for all ceramic and metal supported solid oxide fuel cells

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Financial support by the EU project METSAPP (FP7-278257) and Energinet.dk under the project ForskEL 2012-1-10806 is gratefully acknowledged.For improved robustness, durability and to avoid severe processing challenges alternatives to the Ni:YSZ composite electrode is highly desirable. The Ni:YSZ composite electrode is conventionally used for solid oxide fuel cell and solid oxide electrolysis cell. In the present study we report on high performing nanostructured Ni:CGO electrocatalyst coated A site deficient Lanthanum doped Strontium Titanate (La0.4Sr0.4Fe0.03Ni0.03Ti0.94O3) based anodes. The anodes were incorporated into the co-sintered DTU metal supported solid oxide fuel cell design and large sized 12 cm Ă— 12 cm cells were fabricated. The titanate material showed good processing characteristics and surface wetting properties towards the Ni:CGO electrocatalyst coating. The cell performances were evaluated on single cell level (active area 16 cm2) and a power density at 0.7 V and 700 Â°C of 0.650 Wcm−2 with a fuel utilization of 31% was achieved. Taking the temperature into account the performances of the studied anodes are among the best reported for redox stable and corrosion resistant alternatives to the conventional Ni:YSZ composite solid oxide cell electrode.Publisher PDFPeer reviewe

Konflikter i skolan : En kvalitativ studie om hur pedagoger uttalar sig om konflikthanteringsarbete i skolan

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VÄrt syfte med detta arbete Àr att synliggöra vilka konflikthanteringsmetoder sex pedagoger pÄ skolor i en mellanstor kommun i sydöstra Sverige sÀger sig arbeta med. Pedagogerna Àr verksamma inom Ärskurs 1-3 samt fritidshemmet. Syftet Àr ocksÄ att redogöra för pedagogernas erfarenheter och Äsikter om den konflikthanteringsmetod som möjligtvis anvÀnds. Vi vill Àven synliggöra vilka faktorer som kan bidra till konflikter i skolan. De forskningsfrÄgor vi arbetar utefter Àr: Vilka konflikthanteringsmetoder anvÀnds? Upplever pedagogerna att arbetet ger resultat? Vilka slags konflikter upplever pedagogerna finns mellan elev/elev och elev/pedagog i skolan? Arbetet ger en översikt av hur konflikthantering kan se ut i skolan, vilka faktorer som kan pÄverka konflikter och dess uppkomst samt hur man som pedagog arbetar med konflikthantering i skolan. Genom intervjuer med verksamma pedagoger har vi sökt svar pÄ ovanstÄende frÄgor. Sammanfattningsvis pekar resultaten av vÄr undersökning pÄ att de skolor som deltagit i undersökningen arbetar medvetet med konflikthantering genom olika metoder. LikasÄ ser orsaker till konflikter likvÀrdiga ut pÄ samtliga skolor trots att de anvÀnder olika metoder för att förebygga konflikter. DÀremot finns det skillnader i resultatet som konflikthanteringsarbetet ger, dÄ endast en av pedagogerna som medverkat i undersökningen anser sig kunna se resultat av den konflikthanteringsmetod som anvÀnds av denna person

Performance Factors and Sulfur Tolerance of Metal Supported Solid Oxide Fuel Cells with Nanostructured Ni:GDC Infiltrated Anodes

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Two metal supported solid oxide fuel cells (active area 16 cm2) with nanostructured Ni:GDC infiltrated anodes, but different anode and support microstructures were studied in respect to sulfur tolerance at the aimed operating temperature of 650ÂșC. The studied MS-SOFCs are based on ferretic stainless steel (FeCr) and showed excellent performance characteristics at 650ÂșC with area specific resistances (ASR) of 0.35 Ωcm2 and 0.7 Ωcm2 respectively. The sulfur tolerance testing was performed by addition/removal of 2, 5, and 10 ppm H2S in hydrogen based fuel under galvanostatic operation at a current load of 0.25Acm-2. The results were compared with literature on the sulfur tolerance of the conventional SOFC Ni/YSZ cermet anode. The comparison in terms of absolute cell resistance increase and relative anode polarization resistance increase indicate, that the nanostructured Ni:GDC MS-SOFC based anode is significantly more sulfur tolerant than the conventional Ni/YSZ cermet anode.</jats:p
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