Ni-Ce-ZrO2 system as anode material for direct internal reforming biogas solid oxide fuel cells

Escudero, M.J.; Valero, Conrado; Cauqui, M.A.; Goma, Daniel; Yeste, María Pilar

doi:10.1016/j.fuel.2022.124247

Cited by 16 publications

(15 citation statements)

References 52 publications

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“…Three relaxations can be separated at ∼10 3 , 10 2 , and 10 Hz, in agreement with typical results for anode-supported cells. , The largest contribution is at 10 3 Hz, usually attributed to charge transfer phenomena and ionic transport . The relaxations at 10 2 and 10 Hz are related to electrode processes, usually, cathodic adsorption/desorption and transport of ionic species, and anodic mass diffusion occurring at the low frequency end of the diagrams, respectively. − After the durability test (130 h), the DRT under H 2 exhibited no significant changes. Peaks at 10 3 and 10 Hz are slightly shifted to lower frequencies, indicating that the charge transfer process and low frequency mass diffusion process are slightly retarded after the durability test.…”

Section: Resultssupporting

confidence: 82%

“…The largest R p increase is observed for the components at intermediary (∼10 2 Hz), which is reported to be temperature dependent, and low (∼1 to 10 Hz) frequencies. The low frequency contributions are usually temperature independent and associated with gas diffusion in the anode substrate, and it is noticeable that by changing the fuel from H 2 to ethanol, there is a significant shift in the anode gas diffusion contribution to lower frequencies, which is likely associated with the diffusion of the large unreformed ethanol molecules and fuel dilution by other products of the ESR reaction. ,, It is interesting to note that the EIS data in ethanol revealed no significant electrode degradation after the durability test. The relatively small increase in both R s and R p agrees with the rather stable performance of the fuel cell on dry ethanol.…”

Section: Resultsmentioning

confidence: 99%

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Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Machado,

Rodrigues,

Vilela

et al. 2024

ACS Appl. Energy Mater.

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Matching the catalytic activity of nanostructured materials and processing parameters for high-temperature electrochemical devices is a challenge. Controlling the nanoparticle shape has been proposed as an alternative method to stabilize crystalline surfaces to inhibit particle coarsening and sustain catalytic activity after high-temperature treatment. In this study, nickel-based catalysts supported on shape-controlled (nanorods and nanocubes) gadolinium-doped cerium oxide (GDC) were evaluated for the steam reforming reaction of ethanol, aiming at direct ethanol solid oxide fuel cells (SOFC). The morphology of the support was shown to have an important role in the catalytic activity, particularly when heat treatments for fuel cell fabrication are considered. The Ni catalyst supported on the GDC nanorods sustained the highest catalytic activity after heat treatment despite the morphology change of the support at high temperatures. The excellent properties of the shape-controlled materials were demonstrated in SOFC using the Ni-GDC catalytic layer tailored for the operation on anhydrous ethanol at 700 °C. The fuel cell exhibited a stable performance for more than 100 h of continuous operation without any sign of degradation due to carbon deposition. Such a result is an important step toward the stable operation of direct ethanol intermediate temperature solid oxide fuel cells.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Machado,

Rodrigues,

Vilela

et al. 2024

ACS Appl. Energy Mater.

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“…A solid oxide fuel cell (SOFC) can directly convert the chemical energy of hydrocarbon fuels into electrical energy with high efficiency [11][12][13]. SOFCs are all-solid-state fuel cells operated at high temperatures (600 • C-900 • C); they are attracting intensive attention because of their high power generation efficiency, which is greater than 50% [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…SOFCs are all-solid-state fuel cells operated at high temperatures (600 • C-900 • C); they are attracting intensive attention because of their high power generation efficiency, which is greater than 50% [14][15][16][17][18]. High-temperature SOFCs can be fed hydrocarbons directly for power generation [13,19,20].…”

Section: Introductionmentioning

confidence: 99%

Paper‐structured catalyst with a dispersion of ceria‐based oxide support for improving the performance of an SOFC fed with simulated biogas

Tu,

Sakamoto,

Dinh

et al. 2024

Fuel Cells

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Solid oxide fuel cells (SOFCs) can accept a direct feed of biogas for power generation; however, carbon deposition is a major obstacle to their practical application. When a paper‐structured catalyst (PSC) with a dispersion of Ni‐loaded flowerlike Ce0.5Zr0.5O2 (Ni/CZ(F)) was applied to the anode of an electrolyte‐supported cell (ESC), the open‐circuit voltage of the cell directly fed simulated biogas was increased from 0.87 to 0.98 V at 750°C. The rates of cell‐voltage degradation and coke formation of the ESC with the Ni/CZ(F)‐PSC during 100 h of operation were 4.3% kh−1 and 0.43 mg‐C g‐PSC−1 h−1, respectively, which were lower than those of an ESC with a Ni‐loaded PSC without the CZ(F) dispersion (10.4% kh−1 and 8.1 mg‐C g‐PSC−1 h−1, respectively). This performance improvement is attributed to the unique porous morphology and high oxygen storage capacity of CZ(F), which can contribute to the prevention of Ni agglomeration and the removal of coke from the catalyst surface, respectively. Thus, the Ni/CZ(F)‐PSC can function as a practically applicable reforming domain for an internal‐reforming biogas‐fueled SOFC.

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“…In some cases, the oxide is not involved in the electrocatalytic activity promotion of Pd, the oxide matrix ensures the development of a high surface area electrocatalyst. A variety of oxide matrices have been reported as CeO 2 , [7] ZrO 2 , [8,9] TiO 2 , [10,11] WO 3, [12,13] and CuO, [14,15] to aid the improvement of the electrooxidation of activity and to enhance the poisoning resistance. Therefore, including the MO promotes the Pd d-character, which is essential in forming chemisorption bonds, improving electrocatalytic performances, and promoting the scission of CÀ C bonds.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

Matthews,

Chabalala,

Mbokazi

et al. 2023

ChemCatChem

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A series of Pd nanoparticles supported on V2O5 immobilized on functionalized carbon, %Pd (1, 3, and 5) and %V2O5 (10, 20, and 30), were prepared by sodium borohydride‐assisted microwave polyol synthesis for glycerol oxidation reaction (GlyOR) in an alkaline medium. Electrocatalysts loading, temperature, V2O5 immobilization, and their synergistic effect on the electrocatalytic performance are systematically studied. The electrocatalysts' morphology and electronic properties were investigated using X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, Transmission electron microscopy, and X‐ray photoelectron spectroscopy. A significantly improved GlyOR is observed with increased V2O5 content and Pd percentage. The 5%Pd/30%V2O5–fAC showed the highest mass activity of 2157.3 mA.mg‐1Pd, a more negative onset potential of 0.62 VRHE, versus the commercial equivalent, and possessed high stability and durability. The increase in electrocatalytic activity is attributed to the effective immobilization of V2O5 on fAC efficient synergism between Pd and V2O5, strong metal support interaction (SMSI), and great exposure of the electroactive sites. The results herein contribute significantly to the understanding of the physicochemical and electrochemical effects of metal oxide immobilization, microwave irradiation, %Pd/%Metal oxide optimization, and SMSI on metal oxide‐carbon hybrid electrocatalysts for GlyOR, opening new avenues for fabricating high‐performance direct alkaline glycerol fuel cells.

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Ni-Ce-ZrO2 system as anode material for direct internal reforming biogas solid oxide fuel cells

Cited by 16 publications

References 52 publications

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Paper‐structured catalyst with a dispersion of ceria‐based oxide support for improving the performance of an SOFC fed with simulated biogas

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation

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Ni-Ce-ZrO2 system as anode material for direct internal reforming biogas solid oxide fuel cells

Cited by 16 publications

References 52 publications

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Shape Control of Ceria Catalytic Supports for Enhanced Ethanol Reforming in Solid Oxide Fuel Cells

Paper‐structured catalyst with a dispersion of ceria‐based oxide support for improving the performance of an SOFC fed with simulated biogas

Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V2O5‐fAC towards Glycerol Electrooxidation

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Resources

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Unveiling the Collaborative Strategy and Synergistic Effects of Pd/V₂O₅‐fAC towards Glycerol Electrooxidation