Mitigation of carbon deposits formation in intermediate temperature solid oxide fuel cells fed with dry methane by anode doping with barium

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

doi:10.1016/j.jpowsour.2009.01.096

Cited by 66 publications

(36 citation statements)

References 32 publications

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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: 55%

“…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: 55%

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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“…Yang et al have prepared an anode with nanostructured barium oxide/nickel (BaO/Ni) interfaces, which displays strong water absorption and low carbon deposition . Rosa et al have found that Ba‐doped Ni 0.53 Cu 0.47 O x /CGO anode has a higher maximum power density (MPD) than the anode without barium doping for the direct use of dry methane in SOFC . Coating the Ni‐based catalysts with an inert species to form a core‐shell structured catalyst can effectively prevent them from accumulating .…”

Section: Introductionmentioning

confidence: 99%

Improvement of solid oxide fuel cell performance by a core‐shell structured catalyst using low concentration coal bed methane fuel

et al. 2020

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A core-shell structured catalyst Ni-BaO-CeO 2 @SiO 2 (@NBC; 7.87% Ni content) with high catalytic activity and thermal stability is prepared and utilized for partial oxidation of methane. The catalyst is introduced into the Ni-8 mol% Ystabilized ZrO 2 anode of a conventional solid oxide fuel cell (CC) by direct spraying (denoted as P-@NBC//CC) and indirect loading as an independent catalyst layer (denoted as Y-@NBC//CC) to improve the coking resistance and cell stability when low concentration coal bed methane is used. At 800 C, the maximum power density of P-@NBC//CC and Y-@NBC//CC increases bỹ 26.8% and 32.8%, respectively, over that of CC (0.63 W cm −2 ). At a discharge current of 0.16 A at 800 C, the voltage of CC drops to 0 V after 16 hours. In contrast, the voltage of P-@NBC//CC decreases from 0.8 to 0.6 V within 30 hours, and that of Y-@NBC//CC decreases from 0.8 to 0.7 V over 180 hours.The manner of loading of the catalyst layer has a significant effect on the cell stability. The indirect loading mode as an independent catalyst layer has an advantage over the direct spraying method. The postmortem microstructure of the cell reveals that direct spray loading on the anode surface allows the catalyst particles to penetrate into the anode layer and blocks the anode pores, resulting in a lower porosity and higher diffusion resistance. K E Y W O R D Scatalyst layer, coking resistance, methane containing fuels, solid oxide fuel cell

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“…This can help avoiding the formation and deposition of carbon fibers and soot. [8] Furthermore, the additiono fCGO improvest he ionic conduction, oxygen storage, and stabilityo f the electrocatalyst. [9] At heoretical study conducted by An et al has reported the favorable role promoted by as econd transition metal alloyedt oN it owards the adsorption and reaction of sulfur-a nd carbon-based intermediates.…”

Section: Introductionmentioning

confidence: 99%

Nickel–Iron/Gadolinium‐Doped Ceria (CGO) Composite Electrocatalyst as a Protective Layer for a Solid‐Oxide Fuel Cell Anode Fed with Biofuels

et al. 2015

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The performance and reliability of a commercial solid‐oxide fuel cell (SOFC) with the anode coated by a protective catalytic layer is demonstrated. Physico‐chemical and electrochemical characterizations of a Ni–Fe/gadolinium‐doped ceria (CGO) electrocatalyst forming the protective layer are reported. The anode layer was prepared by using a procedure that favors the interaction between Ni and Fe. Power densities approaching 0.3 W cm−2 for the SOFC cell fed with dry organic fuels were obtained. A time test was performed in the presence of a large flow rate of dry organic fuels under operating conditions (0.8 V) showing appropriate fuel flexibility for the device. The resistance to sulfur contamination was verified by feeding increasing amounts of H2S. The cell showed only moderate performance losses until 80 ppm of sulfur contaminant.

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Mitigation of carbon deposits formation in intermediate temperature solid oxide fuel cells fed with dry methane by anode doping with barium

Cited by 66 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

Improvement of solid oxide fuel cell performance by a core‐shell structured catalyst using low concentration coal bed methane fuel

Nickel–Iron/Gadolinium‐Doped Ceria (CGO) Composite Electrocatalyst as a Protective Layer for a Solid‐Oxide Fuel Cell Anode Fed with Biofuels

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