Polarization-driven catalysis via ferroelectric oxide surfaces

Kakekhani, Arvin; Ismail‐Beigi, Sohrab

doi:10.1039/c6cp03170f

Cited by 73 publications

(45 citation statements)

References 289 publications

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“…At higher temperatures, dissociative adsorption of 18 O2 and CO helps to fill the vacant sites (ii) and leave adsorbed O* and C* (iii), permitting CO2 formation via adsorbate reaction (iv) or through direct combination of incoming O2 with C* or incoming CO with O* (v) (the Eley-Rideal mechanism) [143]. Although BaTiO3 did not demonstrate high activity in this study, recent calculations have predicted better results for other ferroelectric materials and reactions when following particular polarization/catalytic cycles [144,145]…”

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confidence: 72%

Surface-screening mechanisms in ferroelectric thin films and their effect on polarization dynamics and domain structures

et al. 2018

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For over 70 years, ferroelectric materials have been one of the central research topics for condensed matter physics and material science, an interest driven both by fundamental science and applications. However, ferroelectric surfaces, the key component of ferroelectric films and nanostructures, still present a significant theoretical and even conceptual challenge. Indeed, stability of ferroelectric phase per se necessitates screening of polarization charge. At surfaces, this can lead to coupling between ferroelectric and semiconducting properties of material, or with surface (electro) chemistry, going well beyond classical models applicable for ferroelectric interfaces. In this review, we summarize recent studies of surface-screening phenomena in ferroelectrics. We provide a brief overview of the historical understanding of the physics of ferroelectric surfaces, and existing theoretical models that both introduce screening mechanisms and explore the relationship between screening and relevant aspects of ferroelectric functionalities starting from phase stability itself. Given that the majority of ferroelectrics exist in multiple-domain states, we focus on local studies of screening phenomena using scanning probe microscopy techniques. We discuss recent studies of static and dynamic phenomena on ferroelectric surfaces, as well as phenomena observed under lateral transport, light, chemical, and pressure stimuli. We also note that the need for ionic screening renders polarization switching a coupled physical-electrochemical process and discuss the non-trivial phenomena such as chaotic behavior during domain switching that stem from this.

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confidence: 72%

Surface-screening mechanisms in ferroelectric thin films and their effect on polarization dynamics and domain structures

et al. 2018

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“…Detailed and systematic analyses are required on nanoribbons [157], nanoscrolls, clusters, or quantum dots [158] of MXenes. Finally, it is of great interest to synthesize the multifunctional group III based MXenes (e.g., Sc 2 CO 2 ), which, due to their surface polarization, might be good candidates for polarization-driven catalysis [159].…”

Section: Discussionmentioning

confidence: 99%

Recent advances in MXenes: From fundamentals to applications

Khazaei

Mishra

Venkataramanan

et al. 2019

Current Opinion in Solid State and Materials Science

307

147

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The family of MAX phases and their derivative MXenes are continuously growing in terms of both crystalline and composition varieties. In the last couple of years, several breakthroughs have been achieved that boosted the synthesis of novel MAX phases with ordered double transition metals and, consequently, the synthesis of novel MXenes with a higher chemical diversity and structural complexity, rarely seen in other families of two-dimensional (2D) materials. Considering the various elemental composition possibilities, surface functional tunability, various magnetic orders, and large spin−orbit coupling, MXenes can truly be considered as multifunctional materials that can be used to realize highly correlated phenomena. In addition, owing to their large surface area, hydrophilicity, adsorption ability, and high surface reactivity, MXenes have attracted attention for many applications, e.g., catalysts, ion batteries, gas storage media, and sensors. Given the fast progress of MXene-based science and technology, it is timely to update our current knowledge on various properties and possible applications. Since many theoretical predictions remain to be experimentally proven, here we mainly emphasize the physics and chemistry that can be observed in MXenes and discuss how these properties can be tuned or used for different applications.

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“…[1][2][3][4][5] In this respect, adsorbed water from the environment has long been recognized as playing a crucial role in electrostatic screening under atmospheric conditions due to its polar nature and ionic conductivity, and the associated screening dynamics have been studied as a function of humidity 6,7 and temperature, [8][9][10] leading to the development of a full thermodynamic theory of the screening mechanisms. 11 However, few studies and ab initio modeling have considered the capacity of water molecules to dissociate and participate in redox chemical reactions at ferroelectric surfaces, [12][13][14][15][16] which would be expected to provide a large additional screening contribution, 17,18 in particular on highly reactive perovskite oxides. 19,20 Moreover, surface chemistry is not only important for the stabilization of ferroelectric surfaces, 21 but in fact polarization switching kinetics are intrinsically coupled to surface electrochemical phenomena.…”

Section: Introductionmentioning

confidence: 99%