“Stretching” the energy landscape of oxides—Effects on electrocatalysis and diffusion

Yildiz, Bilge

doi:10.1557/mrs.2014.8

Cited by 209 publications

(253 citation statements)

References 100 publications

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“…In this scheme, slip and catch bonds derive from a variety of potential energy landscapes, promoting strain engineering of individual bonds. 26 This could be an early report to suggest the existence of catch bonds outside the context of biophysics; tying up with previously predicted nanomechanical interlocking in polymer/CNT ensembles upon straining. 27 Remarkably, a quantitative account of aging can be derived by examining the dynamics of NEXAFS spectra upon thermal excitation.…”

Section: -532xsupporting

confidence: 58%

“…The proposed model offers an indication to potential energy landscapes, similar to those involved in catch bond dynamics, 22 and strain-induced reactivity. 26 It is worth highlighting the impact of these findings, placing emphasis on the importance of processing towards the formation and evolution of π -π interactions. Further studies aim at correlating thermodynamics associated with processing conditions and resulting molecular interplay, since those will determine the durability of nanocomposites towards microsystem technology adoption.…”

Section: -532xmentioning

confidence: 99%

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Prestrain relaxation in non-covalently modified ethylene-vinyl acetate | PyChol | multiwall carbon nanotube nanocomposites

et al. 2014

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Effects of aging on chemical structure and molecular dynamic behaviour of strained thermally active ethylene-vinyl acetate | multiwall carbon nanotube (EVA|MWCNT) composites were investigated by spectroscopy and microscopy techniques. Aged composites showed spatial inhomogeneity due to system relaxation. Inhomogeneity is attributed to segregation of non-covalently linked cholestryl 1-pyrenecarboxylate, acting as MWCNT dispersant and polymer compatibilizer. Analysis of molecular interplay between filler and matrix upon in situ temperature variation showed a lack of synchronicity, which had been observed in fresh composites. Reduced synchronous interplay allowed quantification of degraded π-π interactions, promoting PyChol unlatching as a result of both sonication and strained-derived π-π degradation.

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Section: -532xsupporting

confidence: 58%

Section: -532xmentioning

confidence: 99%

Prestrain relaxation in non-covalently modified ethylene-vinyl acetate | PyChol | multiwall carbon nanotube nanocomposites

et al. 2014

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“…It is worth stressing that by applying only a 2% tensile strain, one can reduce the activation energy barrier by ~30%. Such declines immediately suggest benefits towards ionic conduction for SOFCs and oxygen sensor applications [2][3][4] . Concurrent with the strain-induced changes in E a , as shown in Fig.…”

Section: Strain Control Of Oxygen Activation Energy and Formation Entmentioning

confidence: 99%

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Petrie

Mitra

Jeen

et al. 2016

Adv Funct Materials

209

160

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The ability to manipulate oxygen anion defects rather than metal cations in complex oxides is facilitating new functionalities critical for emerging energy and device technologies.However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of an important defect, oxygen vacancies. Here, strontium cobaltite (SrCoO x ) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 °C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ~30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.2

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“…S train engineering offers a new route to tune the reaction and transport kinetics in oxide materials 1 by altering the inherent energy landscape of reactions, as demonstrated also for metals 2,3 and for polymers 4,5 . Strain can be induced in a material by lattice mismatch at the interface of a thin film with a substrate or with neighbouring layers (such as in multilayer composites).…”

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confidence: 99%

Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects

2015

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Strained oxide thin films are of interest for accelerating oxide ion conduction in electrochemical devices. Although the effect of elastic strain has been uncovered theoretically, the effect of dislocations on the diffusion kinetics in such strained oxides is yet unclear. Here we investigate a 1/2o1104{100} edge dislocation by performing atomistic simulations in 4-12% doped CeO 2 as a model fast ion conductor. At equilibrium, depending on the size of the dopant, trivalent cations and oxygen vacancies are found to simultaneously enrich or deplete either in the compressive or in the tensile strain fields around the dislocation. The associative interactions among the point defects in the enrichment zone and the lack of oxygen vacancies in the depletion zone slow down oxide ion transport. This finding is contrary to the fast diffusion of atoms along the dislocations in metals and should be considered when assessing the effects of strain on oxide ion conductivity.

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“Stretching” the energy landscape of oxides—Effects on electrocatalysis and diffusion

Abstract: Abstract

Cited by 209 publications

References 100 publications

Prestrain relaxation in non-covalently modified ethylene-vinyl acetate | PyChol | multiwall carbon nanotube nanocomposites

Prestrain relaxation in non-covalently modified ethylene-vinyl acetate | PyChol | multiwall carbon nanotube nanocomposites

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Edge dislocation slows down oxide ion diffusion in doped CeO2 by segregation of charged defects

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