Robust nano-architectured composite thin films for a low-temperature solid oxide fuel cell cathode

Seo, Han Gil; Choi, Yoonseok; Koo, Bonjae; Jang, Ahreum; Jung, WooChul

doi:10.1039/c6ta00052e

Cited by 26 publications

(17 citation statements)

References 49 publications

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“…The detailed derivation process of out-diffusion solution from finite source is described in Supplementary Equations 1 – 3 . It should be noted that the obtained diffusion coefficient is ten orders of magnitude faster than that of a similar transition metal reported in ceria bulk lattice (e.g., Fe in Gd 0.1 Ce 0.9 O 1.95 38 ) when extrapolated to the same temperature (700 °C), and thus one can readily see the effectiveness of the grain boundaries for the migration of dopant cations. Lastly, the total amount of particles produced can be freely controlled by changing the supply of the metal source.…”

Section: Resultsmentioning

confidence: 58%

In situ synthesis of supported metal nanocatalysts through heterogeneous doping

et al. 2018

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Supported metal nanoparticles hold great promise for many fields, including catalysis and renewable energy. Here we report a novel methodology for the in situ growth of architecturally tailored, regenerative metal nanocatalysts that is applicable to a wide range of materials. The main idea underlying this strategy is to selectively diffuse catalytically active metals along the grain boundaries of host oxides and then to reduce the diffused metallic species to form nanoclusters. As a case study, we choose ceria and zirconia, the most recognized oxide supports, and spontaneously form various metal particles on their surface with controlled size and distribution. Metal atoms move back and forth between the interior (as cations) and the exterior (as clusters) of the host oxide lattice as the reductive and oxidative atmospheres repeat, even at temperatures below 700 °C. Furthermore, they exhibit excellent sintering/coking resistance and reactivity toward chemical/electrochemical reactions, demonstrating potential to be used in various applications.

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Section: Resultsmentioning

confidence: 58%

In situ synthesis of supported metal nanocatalysts through heterogeneous doping

et al. 2018

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“…The CELD method developed for deposition on Pt electrodes [ 66 ] was further extended by the authors to forming low-temperature Ag-based composite cathodes [ 71 ]. Cathodic electrodeposition of Pr 0.2 Ce 0.8 O 2−δ (PCO) film onto the surface of 400 nm-thick nanoporous Ag electrodes, formed on a single-crystal 8YSZ substrate by magnetron sputtering, was performed using a traditional three-electrode system with a standard calomel electrode for a reference electrode, a carbon rod as a counter electrode and a tailor-made aluminum clip connected with Ag electrode, which served as a working electrode.…”

Section: Electrodeposition Technology For the Fabrication Of Sofc Air Electrodes With Increased Performancementioning

confidence: 99%

“…The PCO film covered the Ag columns with flake-like particles. In the top-view image of the Ag–PCO film, micrometer-scale cracks were observed, as in the case of the Pt–SDC electrode [ 66 ]. It was shown that only 45 s of the CELD process resulted in 33-fold improved activity of the electrode (121.5 and 3.7 Ω cm 2 at 450 °C).…”

Section: Electrodeposition Technology For the Fabrication Of Sofc Air Electrodes With Increased Performancementioning

confidence: 99%

Opportunities, Challenges and Prospects for Electrodeposition of Thin-Film Functional Layers in Solid Oxide Fuel Cell Technology

Калинина

Pikalova

2021

Materials

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Electrolytic deposition (ELD) and electrophoretic deposition (EPD) are relevant methods for creating functional layers of solid oxide fuel cells (SOFCs). This review discusses challenges, new findings and prospects for the implementation of these methods, with the main emphasis placed on the use of the ELD method. Topical issues concerning the formation of highly active SOFC electrodes using ELD, namely, the electrochemical introduction of metal cations into a porous electrode backbone, the formation of composite electrodes, and the electrochemical synthesis of perovskite-like electrode materials are considered. The review presents examples of the ELD formation of the composite electrodes based on porous platinum and silver, which retain high catalytic activity when used in the low-temperature range (400–650 °C). The features of the ELD/EPD co-deposition in the creation of nanostructured electrode layers comprising metal cations, ceramic nanoparticles, and carbon nanotubes, and the use of EPD to create oriented structures are also discussed. A separate subsection is devoted to the electrodeposition of CeO2-based film structures for barrier, protective and catalytic layers using cathodic and anodic ELD, as well as to the main research directions associated with the deposition of the SOFC electrolyte layers using the EPD method.

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“…Rare‐earth‐doped CeO 2 (ceria) has an excellent oxygen storage/supply capacity and sufficient oxygen ion/proton transport capabilities and is therefore widely used as a catalyst and an electrolyte in applications such as three‐way catalysts, hydrocarbon reformers, and solid oxide fuel cells (SOFCs). [ 1–10 ] In such devices, ceria is typically in close contact with other metallic components, including transition metals. Thus, metallic cations can penetrate into and/or react with ceria, especially when operating at high temperatures for long periods of time, eventually affecting the performance of the devices.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Cation Impurities through Ceria Grain Boundaries

Kwak

Lim

Jeong

et al. 2020

Adv Materials Inter

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Cerium oxide (ceria) is widely used in relation to solid electrolytes in multiple high‐temperature devices, allowing metal components in contact to penetrate into the ceria, especially along the grain boundaries. However, few researchers have concentrated on the migration of metal cations at the operating temperatures (e.g., 600–750 °C) of these devices. Here, the diffusion and solubility of transition metals are investigated through acceptor‐doped ceria grain boundaries as a function of the temperature, pO2, dopant type, and doping concentration. The use of thin‐film samples with high grain boundary density levels and time‐of‐flight secondary ion mass spectrometry with ppb‐level chemical resolution enables an accurate analysis of the concentration profiles of metal species present inside the grain boundaries at such low temperatures. Ni, Fe, and Pt migrate unexpectedly rapidly, and the amounts and types of rare‐earth dopants have a considerable effect on the diffusion of the transition metal. Furthermore, transition metals (Mn, Fe, Co, Ni, and, Cu) are present at the grain boundaries at substantial solubility levels of ≈1022 cm−3, i.e., 1–2 orders of magnitude greater than in the bulk lattice. The observed dynamic behaviors of transition metals present a new perspective on the performance and durability of ceria‐containing applications.

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Robust nano-architectured composite thin films for a low-temperature solid oxide fuel cell cathode

Cited by 26 publications

References 49 publications

In situ synthesis of supported metal nanocatalysts through heterogeneous doping

In situ synthesis of supported metal nanocatalysts through heterogeneous doping

Opportunities, Challenges and Prospects for Electrodeposition of Thin-Film Functional Layers in Solid Oxide Fuel Cell Technology

Diffusion of Cation Impurities through Ceria Grain Boundaries

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