<i>A</i>-site deficient chromite with <i>in situ</i> Ni exsolution as a fuel electrode for solid oxide cells (SOCs)

Amaya-Dueñas, Diana-María; Chen, Guoxing; Weidenkaff, Anke; Sata, Noriko; Feng, Han; Biswas, Indro; Costa, Rémi; Friedrich, K. Andreas

doi:10.1039/d0ta07090d

Cited by 29 publications

(40 citation statements)

References 59 publications

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“…The peak at a binding energy of 838.2 eV is the satellite peak of 3d 5/2 , while the peak at 855.1 eV is the satellite peak of 3d 3/2 and Ni 2p 3/2 due to the complex structures of two components. 49 Raman spectra of T-HEOP and S-HEOP are shown comparatively in Figure 2h. Both T-HEOP and S-HEOP present a characteristic peak of B 2g (643 cm −1 ), stretching of the Fe/Co/Ni/Cr/MnO 6 octahedron, and an A g mode near ∼640 and ∼500 cm −1 corresponding to the symmetric and asymmetric stretching of octahedral oxygen.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Metal–Tannin Coordination Assembly Route to Nanostructured High-Entropy Oxide Perovskites with Abundant Defects

Chen

Nie

et al. 2022

Chem. Mater.

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High-entropy oxide perovskites (HEOPs), the incorporation of five or more elements into ABO 3 , possess great flexibility in the composition and electron structure and thus merit untold scientific and technological potential. However, the conventional synthetic methods at high temperatures tend to obtain the bulk with a low surface area, limited exposed active sites, and result in poor catalytic activity. Herein, we report a metal−tannin coordination assembly strategy to synthesize HEOP nanoparticles (NPs) with a size of 10−30 nm and abundant oxygen vacancies. Interestingly, up to 10 immiscible metal elements could be confined into the single HEOP NPs. Meanwhile, the as-synthesized La(FeCoNiCrMn) 3 NPs exhibit better CO oxidation activity than single-metal−oxide perovskites and the conventionally solidstate prepared HEOP catalysts. Moreover, the entropy-stabilized NPs function well in moistureor SO 2 -containing reaction conditions. This work opens up new opportunities to design nanostructured high-entropy materials for heterogeneous catalysis.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…For the La 3d spectra, as shown in Figure g, a couple of spin-orbital peaks of La 3d 5/2 at 834.4 eV and La 3d 3/2 at 851.2 eV are observed. The peak at a binding energy of 838.2 eV is the satellite peak of 3d 5/2 , while the peak at 855.1 eV is the satellite peak of 3d 3/2 and Ni 2p 3/2 due to the complex structures of two components …”

Section: Resultsmentioning

confidence: 99%

Metal–Tannin Coordination Assembly Route to Nanostructured High-Entropy Oxide Perovskites with Abundant Defects

Chen

Nie

et al. 2022

Chem. Mater.

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“…[145,446] Nonetheless, for electrolysis application, performance reports with perovskite electrode though very promising with respect of the performance of traditional cermet, are limited to samples size below 20 cm 2 . [447] Figure 23. Co-electrolysis process with SOC regardless of the cell architecture for the production of syngas.…”

Section: Fuel Electrodementioning

confidence: 99%

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Chen

Feldhoff

Weidenkaff

et al. 2021

Adv Funct Materials

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Mixed ionic-electronic conducting (MIEC) membranes have gained growing interest recently for various promising environmental and energy applications, such as H 2 and O 2 production, CO 2 reduction, O 2 and H 2 separation, CO 2 separation, membrane reactors for production of chemicals, cathode development for solid oxide fuel cells, solar-driven evaporation and energy-saving regeneration as well as electrolyzer cells for powerto-X technologies. The purpose of this roadmap, written by international specialists in their fields, is to present a snapshot of the state-of-the-art, and provide opinions on the future challenges and opportunities in this complex multidisciplinary research field. As the fundamentals of using MIEC membranes for various applications become increasingly challenging tasks, particularly in view of the growing interdisciplinary nature of this field, a better understanding of the underlying physical and chemical processes is also crucial to enable the career advancement of the next generation of researchers. As an integrated and combined article, it is hoped that this roadmap, covering all these aspects, will be informative to support further progress in academics as well as in the industry-oriented research toward commercialization of MIEC membranes for different applications.

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“…State of the art SOC fuel electrode materials are porous nickel-based cermets due to their high electrical conductivity. Their notable catalytic activity of both the metallic nickel phase (toward H 2 dissociation) and the ceramic ceria-based phase (toward H 2 O splitting and recombination) enables a reversible operation. , In cathode-supported cells (CSCs), nickel is traditionally mixed with yttria-stabilized zirconia (YSZ) into Ni-YSZ composite fuel electrodes, while it is more commonly found in combination with gadolinium-doped ceria (CGO), in the form of Ni-CGO cermets in electrolyte-supported cells (ESCs). However, when they are operated in electrolysis, nickel cermet electrodes are prone to irreversible degradation processes.…”

Section: Introductionmentioning

confidence: 99%

“…Particularly promising performance in steam electrolysis at 800 °C (−0.9 A cm –2 at 1.3 V) has been shown with strontium titanate fuel electrodes with precipitation of metallic nanoparticles of Ni and Fe on the perovskite surface . Such precipitation of catalytically active metals, which are embedded in the perovskite lattice under oxidizing conditions and then are exsolved as metallic nanoparticles on the perovskite surface under cathodic polarization and/or chemical reduction, is often denoted as exsolution. ,− …”

Section: Introductionmentioning

confidence: 99%

Operational Aspects of a Perovskite Chromite-Based Fuel Electrode in Solid Oxide Electrolysis Cells (SOEC)

Amaya-Dueñas

Riegraf

Nenning

et al. 2022

ACS Appl. Energy Mater.

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The lanthanum strontium chromite perovskite La 0.65 Sr 0.3 Cr 0.85 Ni 0.15 O 3-δ (L65SCrN) was implemented as fuel electrode in electrolyte-supported cells (ESC). The electrochemical cell performance in steam electrolysis operation with a fuel gas mixture of 80% H 2 O−20% H 2 was demonstrated to be comparable to that of Ni-CGO-based state of the art cells at 860 °C. At 830, 800, and 770 °C, the perovskite fuel electrode exhibited a gain in performance. Lower apparent activation energy barrier values were calculated for the L65SCrN in symmetrical and full cell configurations, in contrast to Ni-CGO fuel electrodes. A reaction model is proposed, where the water-splitting reaction mainly occurs on the oxygen vacancy sites on the L65SCrN surface and where the exsolved metallic Ni nanoparticles assist the catalytic activity of the electrode with hydrogen spillover and H 2 desorption. We observed a voltage degradation of ∼48 mV/kh during 1000 h of operation under steam electrolysis conditions at 860 °C close to the thermoneutral voltage. van der Pauw conductivity measurements corroborated this degradation with a decrease of the perovskite's p-type conductivity, which appeared to be a diffusion-limited phenomenon. Nevertheless, the lower activation energy of the perovskite-based fuel electrode for solid oxide cells (SOCs) is promising for green hydrogen production via steam electrolysis at a reduced temperature (below 860 °C) and without the need of a hydrogen sweep.

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A-site deficient chromite with in situ Ni exsolution as a fuel electrode for solid oxide cells (SOCs)

Abstract: A-site deficient lanthanum strontium chromite perovskite La0.65Sr0.3Cr0.85Ni0.15O3-δ (L65SCrN) decorated by in situ exsolution of Ni nanoparticles was synthesized and implemented as fuel electrode on a 5 cm x 5 cm...

Cited by 29 publications

References 59 publications

Metal–Tannin Coordination Assembly Route to Nanostructured High-Entropy Oxide Perovskites with Abundant Defects

Metal–Tannin Coordination Assembly Route to Nanostructured High-Entropy Oxide Perovskites with Abundant Defects

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

Operational Aspects of a Perovskite Chromite-Based Fuel Electrode in Solid Oxide Electrolysis Cells (SOEC)

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