The Complex Rayleigh Waves in a Functionally Graded Piezoelectric Half-Space: An Improvement of the Laguerre Polynomial Approach

Ke, Li; Jing, Shuangxi; Yu, Jiangong; Zhang, Xiaoming; Zhang, Bo

doi:10.3390/ma13102320

Cited by 17 publications

(10 citation statements)

References 35 publications

(36 reference statements)

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“…On the other hand, ex situ Fourier transform infrared (FTIR) spectra further verify the hydrogen bond formation during the ammoniation/ de‐ammoniation cycles (Figure 4i,j). The FTIR peaks ≈3300—3500 cm −1 is ascribed to the –OH bands from the OH group in our MnAl‐LDH structure, [ 50 ] which gradually disappear during the first charge process from A to G state, corresponding to the aforementioned amorphous transformation and layered structure collapse accompanied with the dissolution of Mn species in LDH. Meanwhile, a strong stretching vibration peak ascribed to SO band at 1000 cm −1 emerges at the F state, [ 51 ] which could be originated from SO 4 2– groups due to the formation of Mn x (OH) y SO 4 ·5H 2 O.…”

Section: Resultsmentioning

confidence: 99%

MnAl Layered Double Hydroxides: A Robust Host for Aqueous Ammonium‐Ion Storage with Stable Plateau and High Capacity

Liu

Guan

et al. 2022

Advanced Energy Materials

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Rechargeable aqueous batteries based on ammonium‐ions shows great potential in low‐cost energy storage systems owing to their prominent superior characteristics, including ultrafast kinetics, long‐term lifespan, and environmental friendliness. Nevertheless, their development is severely challenged by the fact that the as‐reported cathode materials generally fail to satisfy the requirements on high capacity and stable working voltage simultaneously. Herein, the first NH4+ storage behavior in a MnAl layered double hydroxide (LDH) series is reported. Intriguingly, stable working voltage at 0.2 V is observed in the optimized Mn3Al1‐LDH sample with a high discharge capacity of 183.7 mAh g−1 at 0.1 A g−1. When assembling the rocking‐chair battery using a 3,4,9,10‐perylenetetracarboxylic diimide anode, the full battery delivers a high energy density of 45.8 Wh kg−1, surpassing most of its recently reported counterparts. A rapid amorphization conversion of the LDH cathode during the first charge process is revealed, which should be beneficial to NH4+ isotropic transport accompanied by a highly reversible building/breaking process of hydrogen bonds. The results realize a novel layered inorganic cathode material with superior performance for aqueous ammonium‐ion batteries, and the amorphization conversion to facilitate ion storage provides new insight into electrode design for aqueous batteries.

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Section: Resultsmentioning

confidence: 99%

MnAl Layered Double Hydroxides: A Robust Host for Aqueous Ammonium‐Ion Storage with Stable Plateau and High Capacity

Liu

Guan

et al. 2022

Advanced Energy Materials

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“…[ 18 ] The electron‐deficient Co sites and electron‐rich Pt site can be considered FLP‐acid site and FLP‐base site, respectively. The M–S effect, meanwhile, performs a similar role to steric hindrance in the classical FLP catalyst, [ 19 ] which prevents the cancellation of positive and negative charges. [ 20 ] At the meantime, the highly ordered arrangement of atoms on the surface of IMA provides high‐density metal pairs.…”

Section: Resultsmentioning

confidence: 99%

High‐Density Frustrated Lewis Pair for High‐Performance Hydrogen Evolution

Zhang

Qin

et al. 2022

Advanced Energy Materials

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It is significant to develop catalysts with high‐density and adjacent frustrated Lewis pair (FLP) sites. Herein, a method is designed to construct FLPs on an intermetallic alloy (IMA) with regulable acidity and basicity by using the Mott–Schottky effect. By dint of the high‐density FLP site and suitable acidity and basicity on IMA, the fct‐PtCo@NC displays excellent hydrogen evolution reaction performance. The catalyst fct‐PtCo@NC, with high‐density FLP sites, exhibits a fast water adsorption and decomposition rate, which is derived from the synergistic effect of FLP‐acid sites and FLP‐base sites significantly reducing the energy barrier between the two processes. Due to the FLP‐base Pt site, fct‐PtCo@NC has the best binding energy of hydrogen intermediates, the H3O+ generated during the reaction can accumulate on it and form an acid‐like environment, and thus speed up the kinetics of the reaction. In comparison, the catalyst without FLP shows lower binding energy and the formation of H3O+ is not observed. This work opens a new horizon for the design of new‐style heterogeneous FLP catalysts and the catalysts with high‐density and adjacent FLP sites are expected to be used in a variety of multistep catalytic reactions.

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“…Cao et al [5] studied the dispersive behavior of RW in a half-space by using the perturbation technique. Li et al [6] investigated RW propagation in a Functionally Graded Piezoelectric Material (FGPM) half-space by means of a method based on the Laguerre polynomials. Zhang et al [7] used an exact approach to investigate RW in an initially stressed Magneto-Electro-Elastic half-space.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the dispersion of acoustic Rayleigh waves in a Functionally Graded Piezoelectric half-Space

Khaldi

Sanbi

2022

MATEC Web Conf.

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Considerable attention has been given to the study of the propagation of surface waves in order to improve the efficiency and lifetime of the surface acoustic wave devices such as transducers. In this paper, an investigation of the Rayleigh waves in functionally graded piezoelectric material is presented. The Rayleigh surface wave propagation is assumed to take place in a transversely isotropic graded piezoelectric half-space with material properties varying continuously along the thickness direction. The obtained results have shown that dispersive Rayleigh waves can propagate on the surface of the FGPM half-space with characteristics that depend on the graded variation of the material parameters. Based on the dispersion relations, the phase velocity for both the electrically open and shorted cases at the free surface is deduced. The displacement magnitudes and the corresponding decay variations are plotted and discussed.

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The Complex Rayleigh Waves in a Functionally Graded Piezoelectric Half-Space: An Improvement of the Laguerre Polynomial Approach

Cited by 17 publications

References 35 publications

MnAl Layered Double Hydroxides: A Robust Host for Aqueous Ammonium‐Ion Storage with Stable Plateau and High Capacity

MnAl Layered Double Hydroxides: A Robust Host for Aqueous Ammonium‐Ion Storage with Stable Plateau and High Capacity

High‐Density Frustrated Lewis Pair for High‐Performance Hydrogen Evolution

Numerical analysis of the dispersion of acoustic Rayleigh waves in a Functionally Graded Piezoelectric half-Space

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