Instability and growth of nanoscale Ce0.8Gd0.2O1.9/NiO infiltrate in Sr0.94Ti0.9Nb0.1O3–Zr0.84Y0.16O1.92 anodes for solid oxide fuel cells

Zhang, Wei; Kuhn, Luise Theil; Jørgensen, Peter Stanley; Sudireddy, Bhaskar Reddy; Bentzen, Janet Jonna; Bernuy-López, Carlos; Veltzé, Sune; Ramos, Tânia

doi:10.1016/j.jpowsour.2014.02.051

Cited by 16 publications

(11 citation statements)

References 30 publications

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“…Table 1 summarizes for M/CGO infiltrated cells the determined area specific resistances, ASR, and power densities, P, at 650 mV, in 50% H 2 O/H 2 at the start and end of the IP. This initial IP degradation is likely related to the initial growth and morphological changes of both Ni and CGO phases, similar to those described for STN/8YSZ infiltrated symmetric cells [8,9]. Ru/CGO consistently gave higher P for equivalent conditions,~0.7 W cm ±2 at 850 C in 4% H 2 O/H 2 , whereas 0.3 W cm ±2 is obtained for Ni/CGO at the start of IP.…”

Section: Cell Testingsupporting

confidence: 73%

“…Infiltrates start with a particle diameter of 5±10 nm. Ni and CGO particles/clusters after 157 h of a similar LT test were at least twice as large as the Ru/CGO clusters [8], and already at an average of 50 nm in diameter after a short-term initial characterization [9]. After the long-term test at OCV, 50% H 2 O/H 2 , 850 C (see Figure 4b) two distinct morphologies appear: CGO on STN in large facetted islands, up to hundreds of nm, and clusters of Ru-CGO (10±20 nm in diameter) in the concave regions of the electrode.…”

Section: Resultsmentioning

confidence: 89%

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Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

et al. 2014

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Electrolyte supported cells (ESC), with Sc2O3‐stabilized ZrO2 (ScSZ) electrolytes, Gd‐doped ceria (CGO) or M/CGO (M = Ni, Ru) infiltrated Sr0.94Ti0.9Nb0.1O3 (STN94) anodes and LSM/YSZ cathodes, were evaluated for their initial performance and long‐term stability. Power density for the Ru/CGO infiltrated cell reached ∼0.7 W cm–2 at 850 °C, 4% H2O/H2, whereas the Ni/CGO infiltrated cell reached ∼0.3 W cm–2, with the current morphologies and loadings. Operation at 0.125 A cm–2, 850 °C, feeding 50% H2O/H2 to the anode and air to the cathode, for a period >300 h, showed superior stability for the Ru/CGO infiltrated cell, with ∼0.04 mV h–1 degradation rate, when compared to the Ni/CGO infiltrated cell (∼0.5 mV h–1). For the Ni/CGO case, the observed degradation has been tentatively linked to initial changes in the electrochemical active area and long‐term detrimental interactions between components.

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Section: Cell Testingsupporting

confidence: 73%

Section: Resultsmentioning

confidence: 89%

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

et al. 2014

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“…[132] The NiO/CGO nanoparticles exist as fluorite structure in the Adv. [132] The NiO/CGO nanoparticles exist as fluorite structure in the Adv.…”

Section: Perovskite Lst Based Scaffoldmentioning

confidence: 99%

Tailoring SOFC Electrode Microstructures for Improved Performance

Connor

Yue

Savaniu

et al. 2018

Advanced Energy Materials

175

106

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The key technical challenges that fuel cell developers need to address are performance, durability, and cost. All three need to be achieved in parallel; however, there are often competitive tensions, e.g., performance is achieved at the expense of durability. Stability and resistance to degradation under prolonged operation are key parameters. There is considerable interest in developing new cathodes that are better able to function at lower temperature to facilitate low cost manufacture. For anodes, the ability of the solid oxide fuel cell (SOFC) to better utilize commonly available fuels at high efficiency, avoid coking and sulfur poisoning or resistance to oxidation at high utilization are all key. Optimizing a new electrode material requires considerable process development. The use of solution techniques to impregnate an already optimized electrode skeleton, offers a fast and efficient way to evaluate new electrode materials. It can also offer low cost routes to manufacture novel structures and to fine tune already known structures. Here impregnation methodologies are discussed, spectral and surface characterization are considered, and the recent efforts to optimize both cathode and anode functionalities are reviewed. Finally recent exemplifications are reviewed and future challenges and opportunities for the impregnation approach in SOFCs are explored.

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“…It was found that for the TiO 2 ‐supported group VIII noble metals, a dramatic reduction occurred for the chemisorption of the catalysts provided with a CO or H 2 reduction at high temperature. Currently, the great importance has been attached to the SMSI in catalysis, particularly for the metal nanoparticles supported by an oxide (Li et al ., ; Zhang et al ., ; Wang et al ., ). Besides maintaining metal particle sizes as small as possible by blocking particle migration or encountering Ostwald ripening, one of the most typical SMSI characteristics is the occurrence of an oxide thin layer onto the metal nanoparticles in a metal/oxide catalyst subjected to a reduction condition (Fu & Wagner, ), correlated with electron transferring between the metal and oxide (Bruix et al ., ; Campbell, ; Liu et al ., ), as shown in Figure .…”

Section: Introductionmentioning

confidence: 97%

Real‐space observation of strong metal‐support interaction: state‐of‐the‐art and what's the next

Shi

Zhang

et al. 2015

Journal of Microscopy

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The real-space resolving of the encapsulated overlayer in the well-known model and industry catalysts, ascribed to the advent of dedicated transmission electron microscopy, enables us to probe novel nano/micro architecture chemistry for better application, revisiting our understanding of this key issue in heterogeneous catalysis. In this review, we summarize the latest progress of real-space observation of SMSI in several well-known systems mainly covered from the metal catalysts (mostly Pt) supported by the TiO2 , CeO2 and Fe3 O4 . As a comparison with the model catalyst Pt/Fe3 O4 , the industrial catalyst Cu/ZnO is also listed, followed with the suggested ongoing directions in the field.

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Instability and growth of nanoscale Ce0.8Gd0.2O1.9/NiO infiltrate in Sr0.94Ti0.9Nb0.1O3–Zr0.84Y0.16O1.92 anodes for solid oxide fuel cells

Cited by 16 publications

References 30 publications

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

Effect of Ru/CGO versus Ni/CGO Co‐Infiltration on the Performance and Stability of STN‐Based SOFCs

Tailoring SOFC Electrode Microstructures for Improved Performance

Real‐space observation of strong metal‐support interaction: state‐of‐the‐art and what's the next

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