Enhanced SOFC cathode performance by infiltrating Ba0.5Sr0.5Co0.8Fe0.2O3−δ nanoparticles for intermediate temperature solid oxide fuel cells

Ding, Xifeng; Zhu, Wenliang; Xiao-jia, Gao; Hua, Guixiang; Li, Jianfei

doi:10.1016/j.fuproc.2014.09.030

Cited by 20 publications

(7 citation statements)

References 39 publications

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“…However, one of the most effective methods of controlling electrode degradation is to modify their surface chemistry using a wet chemical infiltration process, which also leads to an improvement F3115 of the cathodic electrocatalytic activity. [36][37][38] Liu's group studied the effect of LSM infiltrated on LSCF porous electrodes in depth, obtaining improved stability and performances in all cases; 39,40 Zhu et al embedded BSCF cathodes with a dense LSM layer, improving performances and stability, although they limited the investigation to a very short time (18 h). 41 It is worth noting that BSCF has both a high A/B-site cation size mismatch in the ABO 3 perovskite structure and a very low oxygen vacancy formation energy/vacancy migration enthalpy.…”

mentioning

confidence: 99%

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Giuliano

Carpanese

Clematis

et al. 2017

J. Electrochem. Soc.

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The two half-cell systems were compared to evaluate the influence of infiltration, overpotential and ageing on their performance and stability. Structure, microstructure and chemical composition were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) coupled with Energy Dispersive X-ray spectroscopy (EDX), whereas redox behavior was evaluated through temperature programmed reduction (TPR) and thermal gravimetric analysis (TGA) in combination with electrochemical impedance spectroscopy (EIS), which was also used to test the electrochemical performance. A decrease of polarization resistance for both infiltrated electrodes, compared to the reference ones, was highlighted at open circuit voltage (OCV), although the BSCF-based cathode was more benefitted more from infiltration than the LSCF-based one. Moreover, the application of cathodic overpotentials (−0.1 to −0.3 V) resulted in opposite effects on the LSCF-and BSCF-based cathodes, highlighting a different response of the oxygen vacancies to the applied voltage for the two perovskite compositions. The positive effect of the LSM layer was further confirmed by the observed improvement in long-term stability of both infiltrated perovskite-type systems. 1 They exhibit mixed ionic and electronic conductivity, with excellent charge and mass transfer properties 2 and high oxygen exchange surface coefficients. 3 Their excellent activity for oxygen reduction has been proved widely. [4][5][6][7][8][9][10] Although the structure and electrochemical processes of LSCF and BSCF are quite different, both of them have long-term stability and redox behavior issues to be clarified, in order to be used as cathode materials in commercial devices. Indeed, when used as cathodes in intermediate-temperatures solid oxide fuel cells (IT-SOFCs), they suffer from chemical and structural instability, which causes degradation during operation time. Moreover, the correlation between their redox behavior under electrochemical operating conditions is still unclear. Many studies have been devoted to investigating LSCF degradation and several causes have been reported, among them: i) mutual cations diffusion between interfaces with consequent atoms depletion and phase separation, [11][12][13][14][15][16] ii) LSCF grain coarsening, 17 iii) reactivity with YSZ-based electrolytes, even with ceria-based barrier layer, 18 iv) impurity contamination, namely Cr from metal interconnects and B from sealing when the cell is inside a stack.19-21 Some recent work performed on an LSCF/CGO (Ce 0.9 Gd 0.1 O 2-δ ) composite cathode on a YSZ electrolyte with a CGO barrier layer 11 affirms that Sr depletion, phase separation and cations inter-diffusion occur mainly during the fabrication process, with negligible contributions during long-term * Electrochemical Society Member.e Present Address: R&D Manufacturing Support Dept., Ansaldo Energia, Via Nicola Lorenzi 8, I-16152 Genoa. z E-mail: carpanese@unige.it operation (973 K). On the other hand, some previous works conversely found that LS...

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confidence: 99%

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Giuliano

Carpanese

Clematis

et al. 2017

J. Electrochem. Soc.

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“…5) when Ag loading increased from 0 wt.% to 5 wt.%. This phenomenon has been briefly outlined by Ding et al [9], in which Ag metal may lead to the formation of Ag agglomerates. Therefore, selection of an appropriate Ag loading is important because high Ag loading may form agglomerates that block the pores, causing gas transport restriction that is detrimental for the TPB length and electrochemical performance.…”

Section: Sample Characterisationmentioning

confidence: 94%

“…These noble metals are usually expensive for cell commercialization. Alternatively, silver (Ag) is an inexpensive candidate with high electrocatalytic activity, high oxygen reduction rate, low electrical and contact resistance, good mechanical properties and stable in both oxidising and reduction atmospheres [8,9]. The addition of Ag into cathode components has been studied extensively for intermediate-temperature solid oxide fuel cells, resulting in promising cell performance by a significant reduction in cathode polarisation resistance as compared to Ag-free cathodes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Silver Addition on the Morphological and Thermal Characteristics of Nickel Oxide-Samarium Doped Ceria Carbonate (NiO-SDCC) Composite Anode

Hoa¹,

Rahman²,

Somalu³

2018

IJIE

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Addition of silver (Ag) as an electro-catalyst has been widely investigated to enhance the cathode performance for intermediate-to-low temperature solid oxide fuel cells. Ag is seldom incorporated into composite anode materials, especially for low temperature application. Therefore, this study aimed to investigate the effects of a small amount of Ag on the microstructure and thermal behaviour of nickel oxidesamarium-doped ceria carbonate (NiOSDCC) composite pellets. A high-speed ball milling technique was employed to prepare the NiOSDCC composite anode powder. Subsequently, a small amount of Ag (1, 3, and 5 wt.%) was added into NiOSDCC composite powder via ball milling. The pellets were manually pressed and sintered at 600 °C. Characterisation of the composite anodes included X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), energy-dispersive spectroscopy, scanning electron microscopy, dilatometry and porosity measurement. NiOSDCC maintained good chemical compatibility regardless of Ag loading. FTIR analysis also verified the presence of carbonates, suggesting that Ag did not influence the carbonate bonding in all NiOSDCC. The porosity of all composite anodes was maintained within the satisfactory level for good anode performance (20%40%). The thermal expansion of the composite samples matched well with the SDCC electrolyte. This finding indicated that the addition of small Ag loading into NiOSDCC was within the acceptable range, demonstrating promising potential as low-temperature solid oxide fuel cell composite anode.

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“…Precursor infiltration, which is a method of penetrating the precursor solution into the porous electrode, is the most common approach for forming nanocatalysts in the field of LT-SOFCs. − After the subsequent calcination step of the infiltrates, nanocatalysts in the form of discrete nanoparticles or continuous thin film are formed on the electrode backbone. , Compared to other vacuum-based infiltration techniques, this solution-based process is a highly economical and effective method that can simply achieve the three-dimensional surface coverage of a variety of nanocatalysts on a porous electrode backbone. Typically, high ionic conductors [e.g., Ce 1– x Gd x O 2−δ (CGO) and Y 2 O 3 -stabilized ZrO 2 (YSZ)] , and conventional cathode materials [e.g., La 1– x Sr x MnO 3−δ (LSM) and La 1– x Sr x Co 1– y Fe y O 3−δ (LSCF)] , are chosen as backbone electrodes, while highly active mixed conducting materials [e.g., Sm 1– x Sr x CoO 3−δ (SSC) and Ba 1– x Sr x Co 1– y Fe y O 3−δ (BSCF)] , are used as infiltrating ORR catalysts. However, this common droplet infiltration method employing capillary and gravity force lacks precise control of the fluidity, uniform dispersion, catalyst loading of the precursors over various substrate conditions (composition, microstructure, shape, size, and so on). , These limits make it difficult to achieve process compatibility and scalability over a large area for commercializing LT-SOFCs.…”

mentioning

confidence: 99%

“…21,22 Compared to other vacuum-based infiltration techniques, this solution-based process is a highly economical and effective method that can simply achieve the three-dimensional surface coverage of a variety of nanocatalysts on a porous electrode backbone. Typically, high ionic conductors [e.g., Ce 26,27 are used as infiltrating ORR catalysts. However, this common droplet infiltration method employing capillary and gravity force lacks precise control of the fluidity, uniform dispersion, catalyst loading of the precursors over various substrate conditions (composition, microstructure, shape, size, and so on).…”

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confidence: 99%

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites

et al. 2021

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Electrode architecturing for fast electrochemical reaction is essential for achieving high-performance of low-temperature solid oxide fuel cells (LT-SOFCs). However, the conventional droplet infiltration technique still has limitations in terms of the applicability and scalability of nanocatalyst implementation. Here, we develop a novel two-step precursor infiltration process and fabricate high-performance LT-SOFCs with homogeneous and robust nanocatalysts. This novel infiltration process is designed based on the principle of a reversible sol–gel transition where the gelated precursor dendrites are uniformly deposited onto the electrode via controlled nanoscale electrospraying process then resolubilized and infiltrated into the porous electrode structure through subsequent humidity control. Our infiltration technique reduces the cathodic polarization resistance by 18% compared to conventional processes, thereby achieving an enhanced peak power density of 0.976 W cm–2 at 650 °C. These results, which provide various degrees of freedom for forming nanocatalysts, exhibit an advancement in LT-SOFC technology.

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Enhanced SOFC cathode performance by infiltrating Ba0.5Sr0.5Co0.8Fe0.2O3−δ nanoparticles for intermediate temperature solid oxide fuel cells

Cited by 20 publications

References 39 publications

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Influence of Silver Addition on the Morphological and Thermal Characteristics of Nickel Oxide-Samarium Doped Ceria Carbonate (NiO-SDCC) Composite Anode

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites

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Enhanced SOFC cathode performance by infiltrating Ba0.5Sr0.5Co0.8Fe0.2O3−δ nanoparticles for intermediate temperature solid oxide fuel cells

Cited by 20 publications

References 39 publications

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La0.6Sr0.4Co0.2Fe0.8O3-δversus Ba0.5Sr0.5Co0.8Fe0.2O3-δ

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La0.6Sr0.4Co0.2Fe0.8O3-δversus Ba0.5Sr0.5Co0.8Fe0.2O3-δ

Influence of Silver Addition on the Morphological and Thermal Characteristics of Nickel Oxide-Samarium Doped Ceria Carbonate (NiO-SDCC) Composite Anode

Vapor-Mediated Infiltration of Nanocatalysts for Low-Temperature Solid Oxide Fuel Cells Using Electrosprayed Dendrites

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Product

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Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ

Infiltration, Overpotential and Ageing Effects on Cathodes for Solid Oxide Fuel Cells: La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δversus Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ