Raman scattering from monoalkali (Na-Sb and K-Sb), bialkali (Na-K-Sb) and multialkali (Na-K-Sb-Cs) photocathodes

Tzolov, Marian; Iliev, M. N.

doi:10.1016/0040-6090(92)90481-p

Cited by 19 publications

(6 citation statements)

References 7 publications

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“…An obvious peak centered at ≈139 cm −1 was observed in original electrode, corresponding to the A 1g mode of Sb. In cathodic scanning, with the potential decreasing, a blue-shifting of A 1g (Sb) peak gradually occurred, up to ≈152 cm −1 at 0.16 V, because the BiSb host accepted more electrons to balance the insertion of K ions (Figure 5a), [44] and a new peak located at ≈202 cm −1 simultaneously sprouted out (marked with the red dotted rectangle), which could be ascribed to BiSb-K alloy, [45,46] robustly suggesting the alloying of K and BiSb. Subsequently, with the deposition proceeding, an obvious red-shifting of A 1g (Sb) signals was detected to return to ≈141 cm −1 at 2.0 V, and the peak of BiSb-K intermediate gradually failed to be observed and finally disappeared into noise, implying the recovery of BiSb-K alloy into BiSb (Figure 5b).…”

Section: Resultsmentioning

confidence: 99%

Alloyed BiSb Nanoparticles Confined in Tremella‐Like Carbon Microspheres for Ultralong‐Life Potassium Ion Batteries

Huang

et al. 2021

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Bismuth-antimony alloy is considered as a promising potassium ion battery anode because of its combination of the high theoretical capacity of antimony and the excellent rate capacity of bismuth. However, the large volume change and sluggish reaction kinetic upon cycling have triggered severe capacity fading and poor rate performance. Herein, a nanoconfined BiSb in tremellalike carbon microspheres (BiSb@TCS) are delicately designed to address these issues. As-prepared BiSb@TCS renders an outstanding potassiumstorage performance with a reversible capacity of 181 mAh g −1 after ultralong 5700 cycles at a current density of 2 A g −1 , and an excellent rate capacity of 119.3 mAh g −1 at 6 A g −1 . Such a superior performance can be ascribed to the delicate microstructure. The self-assembled carbon microspheres can strengthen integral structure and effectively accommodate the volume expansion of BiSb nanoparticles, and 2D carbon nanowalls in carbon microspheres can provide fast ion/electron diffusion dynamic. Theoretical calculation also suggests a thermodynamic feasibility of alloyed BiSb nanoparticles for storing potassium ion. Such a work shows that BiSb@TCS possesses a great potential to be a high-performance anode of potassium ion batteries. The rational designing of multiscaled structure would be instructive to the exploitation of other energy-storage materials.

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Section: Resultsmentioning

confidence: 99%

Alloyed BiSb Nanoparticles Confined in Tremella‐Like Carbon Microspheres for Ultralong‐Life Potassium Ion Batteries

Huang

et al. 2021

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“…The characteristics such as the photon absorption and feasible work function make these compounds suitable candidates for electron emission devices [3][4][5]. On the experimental side, high attention to alkali antimonides has been paid for exploration of the important electrical and optical properties for their use in technological applications [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Structural, elastic, electronic and optical properties of bi-alkali antimonides

Murtaza

Ullah

et al. 2016

Bull Mater Sci

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The structural parameters, elastic constants, electronic and optical properties of the bi-alkali antimonides (Na 2 KSb, Na 2 RbSb, Na 2 CsSb, K 2 RbSb, K 2 CsSb and Rb 2 CsSb) were calculated using state-of-the-art density functional theory. Different exchange-correlation potentials were adopted to predict the physical properties of these compounds. The calculated structural parameters are found in good agreement with the available experimental and theoretical results. All the compounds are mechanically stable. The compounds Na 2 KSb, K 2 RbSb, K 2 CsSb and Rb 2 CsSb have direct bandgaps, in which chemical bonding among the cations and anions is mainly ionic. Furthermore, the optical properties of these compounds are described in detail in terms of the dielectric function, refractive index, reflectivity, optical conductivity and absorption coefficient.

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“…Since the earlier investigation [1][2][3][4][5][6][7][8], alkali antimonide compounds have attracted much attention and extensive experimental studies on their properties have been carried out [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%