Comparison of the electrochemical properties of intermediate temperature solid oxide fuel cells based on protonic and anionic electrolytes

Rosa, Daniela La; Faro, Massimiliano Lo; Monforte, Giuseppe; Aricò, A.S.

doi:10.1007/s10800-008-9668-2

Cited by 15 publications

(9 citation statements)

References 32 publications

(30 reference statements)

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“…A significant lower H 2 yield was recorded for the Ni/CGO compared to the alloyed compounds. This clearly indicates the catalytic promotion effect of the second transition element in the alloy towards ethanol conversion in accordance with the results reported in previous studies dealing with other low molecular weight hydrocarbons molecules [19][20][21][22][23] where Ni-Cu/CGO was essentially used as bulk anode.…”

Section: Resultssupporting

confidence: 91%

“…The physico-chemical behaviour and electrochemical performance of the Ni-based alloy/CGO systems for the direct utilization of ethanol are compared to the electrochemical performances of a bare. Previous studies have shown lower tolerance to carbon deposition of bulk Ni/CGO with respect to Ni-Cu/CGO during the direct utilization of dry hydrocarbons [19][20][21][22][23][24]. This confirms the need to avoid a large ensemble of pure Ni atoms as first catalytic layer in the presence of dry organic fuel feed.…”

Section: Introductionsupporting

confidence: 52%

“…In this communication, we report the utilization of Ce 0.9 Gd 0.1 O 2 (CGO) that is a well known material for SOFC anodes due to its excellent catalytic activity towards hydrocarbon oxidation, in combination with nickel-based alloys. The alloy is necessary to modify the Ni-Ni network by introducing a different metal that does not catalyze carbon deposition [19,20]. In fact, the presence of Ni-clusters having a repeated sequence of Ni-Ni bond has been demonstrated to be responsible for the cracking mechanism occurring in the direct utilization of organic fuels [21].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

et al. 2015

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Ni-based alloys were prepared by using the oxalate method and subsequent in-situ reduction. The crystallographic phase and microstructure of the catalysts were investigated. These bimetallic alloys were mixed with gadolinium-doped ceria in order to obtain a composite material with mixed electronic-ionic conductivity. Catalytic and electrocatalytic properties of the composite materials for the conversion of ethanol were investigated. Electrochemical tests were carried out by utilizing the Nibased alloy/CGO cermet as a barrier layer in a conventional anode-supported solid oxide fuel cell (SOFC). A comparative study between the modified cells and a conventional anode-supported SOFC without the protective layer was made. The aim was to efficiently convert the fuel directly into electricity or syngas (H 2 and CO) just before the conventional anode support. In accordance with the exsitu catalytic tests, the SOFC anode modified with Ni-Co/ CGO showed superior performance towards the direct utilization of dry ethanol than the bare anode and that modified with Ni-Cu/CGO. A peak power of 550 mW cm -2 was achieved with the dry ethanol-fed Ni-Co/CGO pre-layer modified-cell at 800°C. A total low frequency resistance of \0.5 X cm 2 at 0.8 V of cell voltage was recorded in the presence of ethanol directly fed to the SOFC.

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Section: Resultssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

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Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

et al. 2015

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“…However, practical operation requires a pre-treatment of organic fuels to convert hydrocarbon and remove sulfur traces [ 4 ]. In parallel, the discovery of new materials and novel cell designs has allowed reducing the operating temperature to 600–800 °C [ 5 , 6 ]. Several studies have been concerned with the development of novel materials [ 7 , 8 ] and in particular novel anodes for advanced SOFCs operating in fuel-flexible mode [ 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

2020

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Exsolved perovskites can be obtained from lanthanum ferrites, such as La0.6Sr0.4Fe0.8Co0.2O3, as result of Ni doping and thermal treatments. Ni can be simply added to the perovskite by an incipient wetness method. Thermal treatments that favor the exsolution process include calcination in air (e.g., 500 °C) and subsequent reduction in diluted H2 at 800 °C. These processes allow producing a two-phase material consisting of a Ruddlesden–Popper-type structure and a solid oxide solution e.g., α-Fe100-y-zCoyNizOx oxide. The formed electrocatalyst shows sufficient electronic conductivity under reducing environment at the Solid Oxide Fuel Cell (SOFC) anode. Outstanding catalytic properties are observed for the direct oxidation of dry fuels in SOFCs, including H2, methane, syngas, methanol, glycerol, and propane. This anode electrocatalyst can be combined with a full density electrolyte based on Gadolinia-doped ceria or with La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) or BaCe0.9Y0.1O3-δ (BYCO) to form a complete perovskite structure-based cell. Moreover, the exsolved perovskite can be used as a coating layer or catalytic pre-layer of a conventional Ni-YSZ anode. Beside the excellent catalytic activity, this material also shows proper durability and tolerance to sulfur poisoning. Research challenges and future directions are discussed. A new approach combining an exsolved perovskite and an NiCu alloy to further enhance the fuel flexibility of the composite catalyst is also considered. In this review, the preparation methods, physicochemical characteristics, and surface properties of exsoluted fine nanoparticles encapsulated on the metal-depleted perovskite, electrochemical properties for the direct oxidation of dry fuels, and related electrooxidation mechanisms are examined and discussed.

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“…14) The activation energy of the proton conduction is typically in the range of 0.30.65 eV 58) and is lower than that of oxide ion conduction in solid oxides used for conventional SOFCs. Thus PCFC can work within intermediate temperature region (400600°C) which is lower than those of the conventional SOFCs based on a doped zirconia oxideion-conducting electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nano-Structured La0.6Sr0.4Co0.2Fe0.8O3−δ Cathode for Protonic Ceramic Fuel Cell by Bead-Milling Method

et al. 2014

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Nano-structured La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3¹¤ (LSCF6428) cathode for protonic ceramic fuel cell (PCFC) prepared from planetary bead-milled nanoparticles was investigated. The cathode made by the bead-milled particles showed a porous structure consisting of homogeneous size particles and pores in the range 100 nm. The PCFC comprised of this cathode, Ni anode and BaCe 0.6 Zr 0.2 Y 0.2 O 3¹¤ (BCZY622) electrolyte increased the cell performances about 6 times that of the cell using the cathode without milling. The cathode preparation using bead-milling is effective in improving the cell performance with an expanded contact area of the cathode/electrolyte interface due to decreasing particle size and good adhesion of the particles to the electrolyte.

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Comparison of the electrochemical properties of intermediate temperature solid oxide fuel cells based on protonic and anionic electrolytes

Cited by 15 publications

References 32 publications

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

Preparation of Nano-Structured La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−δ</sub> Cathode for Protonic Ceramic Fuel Cell by Bead-Milling Method

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Comparison of the electrochemical properties of intermediate temperature solid oxide fuel cells based on protonic and anionic electrolytes

Cited by 15 publications

References 32 publications

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

Investigation of Ni-based alloy/CGO electro-catalysts as protective layer for a solid oxide fuel cell anode fed with ethanol

Lanthanum Ferrites-Based Exsolved Perovskites as Fuel-Flexible Anode for Solid Oxide Fuel Cells

Preparation of Nano-Structured La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3&minus;&delta;</sub> Cathode for Protonic Ceramic Fuel Cell by Bead-Milling Method

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Preparation of Nano-Structured La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−δ</sub> Cathode for Protonic Ceramic Fuel Cell by Bead-Milling Method