Improve electrical conductivity of reduced La2Ni0.9Fe0.1O4+δ as the anode of a solid oxide fuel cell by carbon deposition

Li, Ping; Zhao, Yicheng; Yu, Biao; Jiang, Li; Li, Yongdan

doi:10.1016/j.ijhydene.2015.06.026

Cited by 32 publications

(18 citation statements)

References 52 publications

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“…Unfortunately, biochar deposition on the anode can be a major problem when using conventional designs with a Ni‐based anode where Ni is known to catalyze formation of graphite from hydrocarbons . However, it was recently demonstrated , that formation of carbon improved the anode electrical conductivity by linking Ni particles together with carbon and decreased consequently the ohmic resistance. This phenomenon is dependent on the anode morphology, triple phase boundary distribution and Ni particles connectivity .…”

Section: Resultsmentioning

confidence: 99%

Exploration of Complex Electrochemical and Chemo‐mechanical Behavior of Solid Oxide Fuel Cell Fueled with Pyrolysis Bio‐oil

Elleuch

Halouani

2018

Fuel Cells

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Direct utilization of olive mill wastewater sludge (OMWS) bio‐oil prepared via fast pyrolysis in a Direct‐Biofuel Solid Oxide Fuel Cell (DB‐SOFC) was investigated. A viable power densities (>1,000 W m−2 at 650 °C) and 6 h operation under open circuit conditions were obtained despite crude bio‐oil complex chemistry. When heated, bio‐oil decomposes yielding gases, volatiles and solid residues (biochar). At 650 °C, polarization curve and impedance spectra of SOFC fed by bio‐oil showed peculiar shapes related to complex kinetics and charge transfer mechanism within the anode. The carbon accumulation at 650 °C is managed through oxidations with oxide ions and chemical reaction with CO2 and H2O gases. Above 700 °C, performance degradation was noted related to biochar accumulation at the anode though the promotion of Boudouard reaction, the increase in O2− transfer and possible carbon electrochemical oxidations. The anode chemo‐mechanical instability was observed explaining the rise in cell ohmic resistance and performance degradation after 6 operating hours. Globally, this work demonstrates that direct fed SOFCs with OMWS bio‐oil is achievable using Ni‐SDC anode but enhancement in fuel quality and in anode catalytic activity and stability are required to improve significantly the cell performance.

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Section: Resultsmentioning

confidence: 99%

Exploration of Complex Electrochemical and Chemo‐mechanical Behavior of Solid Oxide Fuel Cell Fueled with Pyrolysis Bio‐oil

Elleuch

Halouani

2018

Fuel Cells

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“…Another way to enhance the electrical conductivity is the addition of metal elements to anode. A simple and cheap method for improving the conductivity is deposition of carbon on the anode . Many anode materials having their conductivity measured under oxidizing and reducing conditions are given below.…”

Section: Classification Of Sofc Anodesmentioning

confidence: 99%

“…Electrodes having high value of ionic electronic conductivity are considered to be the potential electrodes for SOFCs. 115 The value of ionic conductivity is often chosen to be 100 S/cm, but actually, it depends on design of cell and current path length, instead, can have a lowest value of 1 S/cm for a good current collection. However, if material is porous and has a thickness of 0.5 mm, then conductivity would be greater than 1 S/cm to avoid the losses lesser than 0.1 Ω cm 2 .…”

Section: Conductivity-based Sofc Anodesmentioning

confidence: 99%

“…A simple and cheap method for improving the conductivity is deposition of carbon on the anode. 115 Many anode materials having their conductivity measured under oxidizing and reducing conditions are given below. The conductivity is improved gradually up to 64 S cm −1 for Sr 0.88 Y 0.08 TiO 3 (YST) at a temperature of 800°C, and other materials along with their conductivity and temperature are given in the Table 5.…”

Section: Conductivity-based Sofc Anodesmentioning

confidence: 99%

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Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

et al. 2018

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Summary The energy crisis has reached to an alarming situation due to increase in population. To overcome the shortfall of energy, solid oxide fuel cell (SOFC) being cheap, clean, and efficient renewable energy source is getting attention for electricity generation. Out of the three main components as anode, electrolyte, and cathode; anode/fuel electrode is an important component of SOFC because it allows the flow of electrons via external circuit to cathode generating the electric current and hence requires high electrical conductivity. In this review, anode materials synthesized until now are reviewed and by careful analysis categorized on the basis of operating temperature, conductivity, electrode polarization resistance, and structure. This comparison and categorization will provide selection criteria for state‐of‐the‐art and highly efficient anode materials for SOFC. In addition, the synthesis methods have been reviewed on the basis of their pros and cons, which will further facilitate the researchers to select the best synthesis method so as to get optimized properties of materials.

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“…By now, little attention was paid to the electrical resistance of the porous electrode in MFC. Although studies can be found about the electrical resistance in other kinds of fuel cells such as proton exchange membrane fuel cells, [24][25][26] microbial fuel cells, 23,27 and solid oxide fuel cells, 28,29 the conclusions derived from these studies cannot be directly applied to MFC due to the different working mechanisms of the mass and charge transport in different fuel cells.…”

Section: Introductionmentioning

confidence: 99%

Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

Bei

Xü

et al. 2017

Int J Energy Res

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Summary Significant electrical resistance is observed in porous electrodes of microfluidic fuel cell due to the size limitation of this energy system. In this work, role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells is studied with a three‐dimensional numerical model. Parametric simulations are performed to find proper ways to reduce the electrical resistance, including increasing the electrical conductivity of the electrode, changing the electrode geometry, and optimizing the current collector design. The results indicate that the cell cannot fully get rid of the negative influences of the electrical resistance by increasing the electrical conductivity due to the material restriction. Decreasing the electrode length or increasing the electrode width is also not feasible due to the trade‐off between current and current density. Optimization of the aspect ratio of the electrode active region is proved effective in realizing the enhancement of both current and current density. Extending the current collector area from the exposed end to the active region of the porous electrode is also promising as it can decrease the electrical resistance and boost the cell performance simultaneously. The present findings are generally applicable to various miniaturized fuel cell types using porous electrodes.

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Improve electrical conductivity of reduced La2Ni0.9Fe0.1O4+δ as the anode of a solid oxide fuel cell by carbon deposition

Cited by 32 publications

References 52 publications

Exploration of Complex Electrochemical and Chemo‐mechanical Behavior of Solid Oxide Fuel Cell Fueled with Pyrolysis Bio‐oil

Exploration of Complex Electrochemical and Chemo‐mechanical Behavior of Solid Oxide Fuel Cell Fueled with Pyrolysis Bio‐oil

Material and method selection for efficient solid oxide fuel cell anode: Recent advancements and reviews

Role of electrical resistance and geometry of porous electrodes in the performance of microfluidic fuel cells

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