Nonprecious Metal Catalysts for Low Temperature Solid Oxide Fuel Cells

Holme, Timothy P.; Prinz, Fritz B.

doi:10.1021/jp2022538

Cited by 7 publications

(5 citation statements)

References 33 publications

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“…The power density of our fuel cells on 250 µm thick YSZ electrolytes falls together with the power densities measured for standard Pt electrodes on 100 µm YSZ [22]. As the overall fuel cell's power density scales linearly with the thickness of a purely ionic conducting electrolyte [25,33,34], it can be concluded that the electrode performance of herein analysed Pt-based nanowire networks is roughly a factor 3 higher than the conventional nanoporous Pt electrodes [22] and non-precious electrodes [23]. As proof that the electrolyte thickness is indeed the limiting factor for the cell-performance, symmetric fuel cells with Pt-Al electrodes and a 5 µm thin ceramic YSZ foil [26,27] as electrolyte were fabricated as well.…”

Section: Electrochemical Activitysupporting

confidence: 61%

“…In Figure 1 : YSZ (100 µm) [23] power tomography and by scanning electron microscopy is shown. The re-assembly of the metal matrix due to the dissolution of Al results in a network structure with more than 1800 nanowires per µm 3 .…”

Section: Resultsmentioning

confidence: 99%

“…2 (lines) at five different temperatures. (c), Measured peak power density ρ as function of the operating temperature compared to data from literature[22,23]. The orange dotted lines with symbols show an extrapolation of the power density (Pt-Y-Al electrodes) for two different electrolyte thicknesses (100µm,5µm).…”

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confidence: 99%

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Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

et al. 2014

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Pt-alloy compound causes the formation of a highly porous nanowire network with a mean branch thickness below 25 nm and a pore intercept length below 35 nm. The oxygen reduction capability of the resulting electrodes was analysed in a micro-solid oxide fuel cell setup at elevated temperatures (598 − 873K). Here, we demonstrate that these nanoporous thin films excel "state-of-the-art" fuel cell electrodes in terms of catalytic activity and thermal stability. The nanoporous Pt electrodes exhibit exchange current densities that are up to 13 times higher than conventional Pt electrodes, measured at 648 K. It is shown that the enhanced catalytic activity of these Pt electrodes is achieved through the engineering of the materials d-bands due to the addition of yttrium as ternary constituent.

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Section: Electrochemical Activitysupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

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Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

et al. 2014

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“…Considerably higher power densities are expected in case more stable electrodes are used that do not show agglomeration as well as the instability is prevented [20,44,45]. Also, different electrode materials than pure Pt are promising, whereby most of them are based on metals [12,21,25,45,46] and metal-ceramic composites [17,25,27,[47][48][49]. Pure ceramic electrodes [25,[50][51][52][53][54][55] show also encouraging results.…”

Section: Electrochemical Analysismentioning

confidence: 99%

A thermally self-sustained micro-power plant with integrated micro-solid oxide fuel cells, micro-reformer and functional micro-fluidic carrier

Scherrer

Evans

Santis-Alvarez

et al. 2014

Journal of Power Sources

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Low temperature micro-solid oxide fuel cell (micro-SOFC) systems are an attractive alternative power source for small-size portable electronic devices due to their high energy efficiency and density. Here, we report on a thermally self-sustainable reformer -micro-SOFC assembly. The device consists of a micro-reformer bonded to a silicon chip containing 30 micro-SOFC membranes and a functional glass carrier with gas channels and screenprinted heaters for start-up. Thermal independence of the device from the externally powered heater is achieved by exothermic reforming reactions above 470 °C. The reforming reaction and the fuel gas flow rate of the n-butane/air gas mixture controls the operation temperature and gas composition on the micro-SOFC membrane. In the temperature range between 505 °C and 570 °C, the gas composition after the micro-reformer consists of 12 vol.% to 28 vol.% H 2 .An open-circuit voltage of 1.0 V and maximum power density of 47 mW cm -2 at 565 °C is achieved with the on-chip produced hydrogen at the micro-SOFC membranes.

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“…However, it is difficult to control the position or size of nanoparticles in the anode obtained by this method . Alternatively, in situ exsolution technology reported by Yang et al has been considered as an effective method for the fabrication of nanocatalyst-modified anodes. , In fabricated anode materials, exsolved single nano metals, such as Ni, Fe, Co, Mn, Ag, and Ru, are conductive and can improve the electrical conductivity of the anodes and provide more active sites for the reaction of fuels (e.g., H 2 , hydrocarbon, or ammonia) with oxygen ions. ,− Besides, a series of perovskite oxides with evenly dispersed CoFe, FeNi, FeRu, or NiCo alloy nanoparticles has been synthesized in recent years. ,− This is because these metal-oxide heterogeneously structured anodes exhibit a high catalytic property as well as a good agglomeration and coking resistance, which also makes them an active and stable anode, demonstrating a good application prospect in SOFCs. Especially, the perovskite oxide anode with in situ exsolved CoFe nano alloys has attracted increasing research interest. ,,− …”

Section: Introductionmentioning

confidence: 99%

In Situ Exsolved CoFe Alloy Nanoparticles on Gd₂SrCo_0.8Fe_1.2O_7−δ for Direct Hydrocarbon Fuel Solid Oxide Fuel Cells

Li,

Tan,

Yang

et al. 2024

Energy Fuels

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A Ni-free solid oxide fuel cell (SOFC) ceramic anode composed of CoFe alloy (CFA) nanoparticles evenly dispersed in porous Ruddlesden−Popper-type layered oxide Gd 2 SrCo 0.8 Fe 1.2 O 7−δ (RP-GSCF) has been fabricated by an in situ reduction method. The RP-GSCF-CFA anode demonstrates good catalytic activity toward H 2 and hydrocarbon fuels. The La 0.8 Sr 0.2 Ga 0.83 Mg 0.17 O 3−δ (LSGM) electrolyte-supported single cell with RP-GSCF-CFA as the anode and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3−δ (LSCF) as the cathode deliver a maximum power density of 0.45 and 0.34 W cm −2 in humidified H 2 and CH 4 at 800 °C, respectively. Moreover, the RP-GSCF-CFA anode demonstrates good stability in wet CH 4 for over 72 h, indicating good coking resistance.

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Nonprecious Metal Catalysts for Low Temperature Solid Oxide Fuel Cells

Cited by 7 publications

References 33 publications

Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

A thermally self-sustained micro-power plant with integrated micro-solid oxide fuel cells, micro-reformer and functional micro-fluidic carrier

In Situ Exsolved CoFe Alloy Nanoparticles on Gd₂SrCo_0.8Fe_1.2O_7−δ for Direct Hydrocarbon Fuel Solid Oxide Fuel Cells

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Nonprecious Metal Catalysts for Low Temperature Solid Oxide Fuel Cells

Cited by 7 publications

References 33 publications

Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

Platinum-Based Nanowire Networks with Enhanced Oxygen-Reduction Activity

A thermally self-sustained micro-power plant with integrated micro-solid oxide fuel cells, micro-reformer and functional micro-fluidic carrier

In Situ Exsolved CoFe Alloy Nanoparticles on Gd2SrCo0.8Fe1.2O7−δ for Direct Hydrocarbon Fuel Solid Oxide Fuel Cells

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In Situ Exsolved CoFe Alloy Nanoparticles on Gd₂SrCo_0.8Fe_1.2O_7−δ for Direct Hydrocarbon Fuel Solid Oxide Fuel Cells