Preparation of porous Ni–YSZ cermet anodes for solid oxide fuel cells by high frequency induction heated sintering

Yoo, Jong‐Shin; Cho, Chun-Kang; Shon, In-Jin; Lee, Kitae

doi:10.1016/j.matlet.2011.04.032

Cited by 14 publications

(5 citation statements)

References 18 publications

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“…It appears that the particle growth for Ni or NiO is inevitable at high temperatures. Recently, J. Y. Yoo et al 18 proposed a novel method to avoid Ni sintering. The Ni/YSZ cermets anodes were prepared by high frequency induction heated sintering, producing a uniformly porous microstructure without abnormal grain growth found.…”

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confidence: 99%

Effects of Initial Reduction Temperature on the Microstructures and Performances of Ni/YSZ Anodes for Solid Oxide Fuel Cells

Zhu

Guan

Lü

et al. 2013

J. Electrochem. Soc.

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This work focuses on the effects of the reducing and sintering behavior for NiO→Ni on the microstructures and performances of conventional Ni/YSZ (YSZ: yttria-stabilized zirconia) anodes for anode-supported solid oxide fuel cells (SOFCs). A strong dependence of reducing and sintering behavior on the initial reduction temperature for NiO→Ni was demonstrated. Some identical NiO/YSZ anodes were heated from room temperature (RT) to 850°C with a heating rate of 10°C/min. and the reducing gas H2 was provided at different temperatures, such as, RT, 600, 650 or 700°C. As a result of initial reduction temperature, the reducing process was found to obviously affect the specific surface areas (BET test), microstructures (SEM test), conductivities (conductivity test) and electrochemical performances (power output and polarization resistance) of reduced Ni/YSZ anode. A model was finally proposed to simulate the reducing and sintering mechanism and combined effects for NiO/YSZ→Ni/YSZ anodes at different initial reduction temperatures.

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mentioning

confidence: 99%

Effects of Initial Reduction Temperature on the Microstructures and Performances of Ni/YSZ Anodes for Solid Oxide Fuel Cells

Zhu

Guan

Lü

et al. 2013

J. Electrochem. Soc.

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“…To improve the oxidation reaction and the resultant cell performance, the anode should have sufficient porosity to supply the fuel and remove the reaction products. Many ways [5,[17][18][19][20] have been used to fabricate anodes, and the anodes have suitable porosity for the fuel moving in and the reaction products moving out. The most useful and popular way to fabricate a porous microstructure is adding pore-forming agents into the NiO-YSZ composite powders [6].…”

Section: Instructionmentioning

confidence: 99%

Effects of Pore-Forming Agent on Characterization of NiO/YSZ Porous Anode for SOFC

Ding

Zhang

Liu

et al. 2016

MSF

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A comparative study has been carried out on the effects of pore-forming agents on the microstructural characteristics and properties including porosity, microstructures, linear sintering shrinkage and mechanical strength of NiO/yttria stabilized zirconia (YSZ). Different pore-forming agents (soluble starch, graphite and activated carbon) were incorporated into NiO/YSZ at various mass mixing ratios (5%, 10% and 15%). The experimental results show that under the condition of same content, sintered samples using activated carbon as pore-forming agent had a higher porosity than that with identical content of the other two kinds of pore-forming agents. Sintered samples with 10.0 wt% activated carbon had a porosity of 35%. Section morphologies show that pores distributed uniformly and connected very well in the anode with activated carbon as pore-forming agent. The mechanical strength of these sintered samples with carbon as pore-forming agent was also higher. With the activated carbon particle size decreasing (from 100 mesh to 320 mesh), the open porosity of porous NiO/YSZ was reduced (from 31.7% to 30.9%). It may be concluded that The activated carbon is the better choice as pore-forming agent for NiO/YSZ anode.

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“…In this cermet, nickel provides the electrical conduction path for the released electrons and also acts as a catalyst for oxidation of hydrogen. YSZ is not only the electrolyte for oxygen ion conduction but also forms a porous matrix which provides the required mechanical properties for cell operation at high temperatures, suppresses nickel sintering and reduces the mismatch of the thermal expansion coefficient between the anode and electrolyte [3,4]. Nickel, YSZ and pores together form the triple phase boundaries (TPBs) where they meet in the vicinity of the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

The effect of pore-former morphology on the electrochemical performance of solid oxide fuel cells under combined fuel cell and electrolysis modes

Laguna‐Bercero

Hanifi

Menand³

et al. 2018

Electrochimica Acta

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The effect of the pore-former used in the Ni-YSZ fuel electrode on the electrochemical performance of solid oxide cells is studied. Three cells with the configuration of Ni-YSZ/YSZ/Nd 2 NiO 4+δ-YSZ were fabricated with different pore-formers, such as graphite, PMMA (polymethyl methacrylate) or an equal mixture of both, which were added to the Ni-YSZ support during the fabrication process. The results show that the Ni-YSZ support containing graphite leads to a more porous support and formation of coarser pores in the vicinity of the electrolyte.

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Preparation of porous Ni–YSZ cermet anodes for solid oxide fuel cells by high frequency induction heated sintering

Cited by 14 publications

References 18 publications

Effects of Initial Reduction Temperature on the Microstructures and Performances of Ni/YSZ Anodes for Solid Oxide Fuel Cells

Effects of Initial Reduction Temperature on the Microstructures and Performances of Ni/YSZ Anodes for Solid Oxide Fuel Cells

Effects of Pore-Forming Agent on Characterization of NiO/YSZ Porous Anode for SOFC

The effect of pore-former morphology on the electrochemical performance of solid oxide fuel cells under combined fuel cell and electrolysis modes

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