Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Acosta, Matias; Baiutti, Federico; Tarancón, Albert; MacManus‐Driscoll, Judith L.

doi:10.1002/admi.201900462

Cited by 43 publications

(27 citation statements)

References 124 publications

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“…As a result, the search for new ion- and electron-conducting metal-oxide materials, as well as innovative concepts and designs for energy conversion and storage devices has accelerated. 1 Notably, considerable attention was given to thin-film deposition techniques, such as pulsed laser deposition (PLD), as many exciting properties including conductivity and ion exchange/diffusion kinetics have been shown to be tuned by the defect structure. Defect features such as lattice strain, structural defects, space charge at the interface and local chemical composition are all proposed to affect mass transport significantly.…”

Section: Introductionmentioning

confidence: 99%

Surface Restructuring of Thin-Film Electrodes Based on Thermal History and Its Significance for the Catalytic Activity and Stability at the Gas/Solid and Solid/Solid Interfaces

Çelikbilek

Cavallaro

Kerherve

et al. 2020

ACS Appl. Mater. Interfaces

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Electrodes in solid-state energy devices are subjected to a variety of thermal treatments, from film processing to device operation at high temperatures. All these treatments influence the chemical activity and stability of the films, as the thermally induced chemical restructuring shapes the microstructure and the morphology. Here, we investigate the correlation between the oxygen reduction reaction (ORR) activity and thermal history in complex transition metal oxides, in particular, La 0.6 Sr 0.4 CoO 3−δ (LSC64) thin films deposited by pulsed laser deposition. To this end, three ∼200 nm thick LSC64 films with different processing and thermal histories were studied. A variety of surface-sensitive elemental characterization techniques ( i.e ., low-energy ion scattering, X-ray photoelectron spectroscopy, and secondary ion mass spectrometry) were employed to thoroughly investigate the cationic distribution from the outermost surface to the film/substrate interface. Moreover, electrochemical impedance spectroscopy was used to study the activity and the stability of the films. Our investigations revealed that, despite the initial comparable ORR activity at 600 °C, the degradation rates of the films differed by twofold in the long-term stability tests at 500 °C. Here, we emphasize the importance of processing and thermal history in the elemental surface distribution, especially for the stability of LSC64 electrodes and propose that they should be considered as among the main pillars in the design of active surfaces.

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Section: Introductionmentioning

confidence: 99%

Surface Restructuring of Thin-Film Electrodes Based on Thermal History and Its Significance for the Catalytic Activity and Stability at the Gas/Solid and Solid/Solid Interfaces

Çelikbilek

Cavallaro

Kerherve

et al. 2020

ACS Appl. Mater. Interfaces

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“…[ 6–12 ] Among all the two‐phase nanocomposite designs, vertically aligned nanocomposites (VANs) offer high‐density vertically aligned interfaces, strain coupling, and strong anisotropic physical properties and have thus attracted great attention. [ 3,13–20 ]…”

Section: Figurementioning

confidence: 99%

Role of Interlayer in 3D Vertically Aligned Nanocomposite Frameworks with Tunable Magnetotransport Properties

Sun

Kalaswad

et al. 2020

Adv Materials Inter

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Very recently, a 3D framework design integrating complex VAN structures has drawn great research interest. [2,6,21,22] The 3D framework is generated by integrating the multilayer and VAN designs together-numerous vertical nanopillars connect with the lateral interlayers to form a 3D interconnected frame embedded in the matrix. This 3D framework design combines the lateral and vertical strain engineering within the film, exhibits both advantages of the multilayer and VAN designs, and achieves an unprecedented degree of control of the film strain and properties. [6,22] The 3D framework thin films were first demonstrated in La 0.7 Sr 0.3 MnO 3 (LSMO)-CeO 2 systems by inserting one to three layers of CeO 2 (or LSMO) interlayers into the LSMO-CeO 2 VAN counterparts and forming 3D CeO 2 (or LSMO) frameworks. [6] Later, the feasibility of this 3D framework concept was demonstrated in LSMO-ZnO system along with a study on the effect of the ZnO interlayer thickness, which was controlled from 0 to ≈10 nm and effectively tuned the magnetotransport performance of the 3D framework films. [22] The overall framework (i.e., the secondary interlayers) embedded in all the reported 3D thin films is homogeneous, such as CeO 2 , LSMO, and ZnO. [6,21,22] Studies on heterogeneous interlayers are still rare. Moreover, the interlayer and its interplay with the matrix material are crucial for the 3D frameworks, since the 3D frames consist of vertical nanopillars and lateral interlayers.To achieve a precise control on the 3D framework structures, understanding the role of the interlayer within the 3D framework is significant and necessary.In this work, a set of 3D framework thin films have been processed by inserting different lateral interlayers (M). These interlayers present different in-plane matching distances from LSMO as illustrated in Figure 1a. The interlayer M candidates are yttria-stabilized zirconia (YSZ, 8 mol% Y 2 O 3 + 92 mol% ZrO 2 ), CeO 2 , SrTiO 3 (STO), BaTiO 3 (BTO), and MgO. In the resulting 3D structures, all ZnO nanopillars connect with the lateral interlayer M and create a 3D heterogeneous frame embedded in the LSMO matrix. The role of the lateral interlayer in determining the 3D heterogeneous framework microstructure and magnetotransport properties is systematically studied. The aforementioned interlayer materials are selected for the following reasons: 1) the in-plane lattice matching To investigate the role of interlayers on the growth, microstructure, and physical properties of 3D nanocomposite frameworks, a set of novel 3D vertically aligned nanocomposite (VAN) frameworks are assembled by a relatively thin interlayer (M) sandwiched by two consecutively grown La 0.7 Sr 0.3 MnO 3 (LSMO)-ZnO VANs layers. ZnO nanopillars from the two VAN layers and the interlayer (M) create a heterogeneous 3D frame embedded in the LSMO matrix. The interlayer (M) includes yttria-stabilized zirconia (YSZ), CeO 2 , SrTiO 3 , BaTiO 3 , and MgO with in-plane matching distances increasing from ≈3.63 to ≈4.21 Å, and expected in-plane stra...

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“…7 Most importantly, when MIECs are employed in the form of thin films, the dense microstructure determines excellent in-plane percolation, while the possibility of nanostructuring via cutting-edge thin film techniques opens up the path towards the exploitation of nanoscale effects such as local fast oxygen reduction kinetics and transport. 8,9 Although the implementation of MIEC-based thin films for the fabrication of SOC functional layers is of great potential e.g. for avoiding the occurrence of areas with high electronic current density or high oxygen chemical potential which may potentially lead to device failure, 10 intrinsic limitations still occur especially in relation to a poor thermal stability owing to dopant segregation towards the surface.…”

Section: Introductionmentioning

confidence: 99%

A Heavily Substituted Manganite in an Ordered Nanocomposite for Long-Term Energy Applications

Baiutti

Chiabrera²,

Acosta³

et al. 2021

Preprint

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<div>The implementation of nano-engineered composite oxides opens up the way towards the development of</div><div>a novel class of superior energy materials. Vertically aligned nanocomposites are characterized by a</div><div>coherent, dense array of vertical interfaces, which allows for the extension of local effects to the whole</div><div>volume of the material. Here, we use such a unique architecture to fabricate highly electrochemically</div><div>active nanocomposites of lanthanum strontium manganite and doped ceria with unprecedented stability</div><div>and straight applicability as functional layers in solid state energy devices. Direct evidence of synergistic</div><div>local effects for enhancing the electrochemical performance, stemming from the highly ordered phase</div><div>alternation, is given here for the first time using atom-probe tomography combined with oxygen isotopic</div><div>exchange. Interface-induced cationic substitution, enabling lattice stabilization, is presented as the origin</div><div>of the observed long-term stability. These findings reveal a novel route for materials nano-engineering</div><div>based on the coexistence between local disorder and long-range arrangement.</div>

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Nanostructured Materials and Interfaces for Advanced Ionic Electronic Conducting Oxides

Cited by 43 publications

References 124 publications

Surface Restructuring of Thin-Film Electrodes Based on Thermal History and Its Significance for the Catalytic Activity and Stability at the Gas/Solid and Solid/Solid Interfaces

Surface Restructuring of Thin-Film Electrodes Based on Thermal History and Its Significance for the Catalytic Activity and Stability at the Gas/Solid and Solid/Solid Interfaces

Role of Interlayer in 3D Vertically Aligned Nanocomposite Frameworks with Tunable Magnetotransport Properties

A Heavily Substituted Manganite in an Ordered Nanocomposite for Long-Term Energy Applications

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