Local Structural Distortion Induced Uniaxial Negative Thermal Expansion in Nanosized Semimetal Bismuth

Li, Qiang; Zhu, He; Zheng, Lirong; Fan, Longlong; Ren, Yang; Deng, Jinxia; Xing, Xianran

doi:10.1002/advs.201600108

Cited by 28 publications

(33 citation statements)

References 42 publications

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“…Fort he pure MoS 2 or MoSe 2 monolayers,t he coordination numbers of Mo-S or Mo-Se reduced slightly, while their disorder degrees increased remarkably compared with bulk counterparts,w hich implied the presence of an oticeable structure distortion that in turn helped to their structural stability. [14] More importantly,T able 1also revealed that the coordination numbers of Mo-S and Mo-Se in the MoSeS alloy monolayers were 2.4 and 2.6, which indicated that the ratio of Sa nd Se was roughly 1:1, fairly consisting with the corresponding ICP,X RF and EDX analysis in Figure S6-7 and Table S1. Furthermore,t he MoSeS alloy monolayers exhibited shortened Mo À Sb ond length and lengthened Mo-Se bond length relative to the MoS 2 and MoSe 2 monolayers,w hich indicated af urther distorted structure,fairly agreeing with the optimized crystal structure by DFT calculations.…”

Section: Angewandte Chemiementioning

confidence: 69%

Carbon Dioxide Electroreduction into Syngas Boosted by a Partially Delocalized Charge in Molybdenum Sulfide Selenide Alloy Monolayers

Xu,

Li,

Liu

et al. 2017

Angew Chem Int Ed

218

143

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Structural parameters of ternary transition-metal dichalcogenide (TMD) alloy usually obey Vegard law well, while interestingly it often exhibits boosted electrocatalytic performances relative to its two pristine binary TMDs. To unveil the underlying reasons, we propose an ideal model of ternary TMDs alloy monolayer. As a prototype, MoSeS alloy monolayers are successfully synthesized, in which X-ray absorption fine structure spectroscopy manifests their shortened Mo-S and lengthened Mo-Se bonds, helping to tailor the d-band electronic structure of Mo atoms. Density functional theory calculations illustrate an increased density of states near their conduction band edge, which ensures faster electron transfer confirmed by their lower work function and smaller charge-transfer resistance. Energy calculations show the off-center charge around Mo atoms not only benefits for stabilizing COOH* intermediate confirmed by its most negative formation energy, but also facilitates the rate-limiting CO desorption step verified by CO temperature programmed desorption and electro-stripping tests. As a result, MoSeS alloy monolayers attain the highest 45.2 % Faradaic efficiency for CO production, much larger than that of MoS monolayers (16.6 %) and MoSe monolayers (30.5 %) at -1.15 V vs. RHE. This work discloses how the partially delocalized charge in ternary TMDs alloys accelerates electrocatalytic performances at atomic level, opening new horizons for manipulating CO electroreduction properties.

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Section: Angewandte Chemiementioning

confidence: 69%

Carbon Dioxide Electroreduction into Syngas Boosted by a Partially Delocalized Charge in Molybdenum Sulfide Selenide Alloy Monolayers

Xu,

Li,

Liu

et al. 2017

Angew Chem Int Ed

218

143

View full text Add to dashboard Cite

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“…Moreover, In 2020, Yu et al [29] reported that PEGylated Bi nanoparticles loaded with the model drug DOX, forming DOX@Bi-PEG nanoparticles, exhibit high photothermal conversion efficiency, strong NIR absorption, high DOX-loading efficiency as well as low cytotoxicity, having potential in chemo-photothermal therapy of cancer cells. Bi nanoparticles with an average diameter of 40 nm synthesized by chemical reduction method [300,301] were mixed with the amphiphilic PEGylated phospholipid (DSPE-PEG) in chloroform under continuous stirring overnight for the complete evaporation of chloroform solvent. The as-prepared Bi-PEG nanoparticles can be well dispersed in deionized water and can remain black, and Bi core is surrounded by a DSPE-PEG layer with the thickness of ≈8 nm.…”

Section: (26 Of 34)mentioning

confidence: 99%

Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Huang

Zhu

Wang

et al. 2020

Adv Funct Materials

139

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Bismuth (Bi), as a nontoxic and inexpensive diamagnetic heavy metal, has recently been utilized for the preparation of a variety of nanomaterials, such as nanoparticles, nanowires, nanotubes, nanosheets, etc., with a tunable bandgap, unique structure, excellent physicochemical properties, and compositional features for versatile properties, such as near‐infrared absorbance, high X‐ray attenuation coefficient, excellent photothermal conversion efficiency, and a long circulation half‐life. These features have endowed mono‐elemental Bi nanomaterials with desirable performances for electronics/optoelectronics, energy storage and conversion, catalysis, nonlinear photonics, sensors, biomedical applications, etc. This review summarizes the controlled synthesis of mono‐elemental Bi nanomaterials with different shapes and sizes, highlights the state‐of‐the‐art progress of the desired applications of mono‐elemental Bi nanomaterials, and presents some personal insights on the challenges and future opportunities in this research area. It is hoped that the controllable manipulation techniques of Bi nanomaterials, along with their unique properties, can shed light on the next‐generation devices based on Bi nanostructures and Bi‐related nanomaterials.

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“…For O3‐type oxides, the introduction of Li + is thought to be favorable for enhancing the electrochemical performance as Li + ions assist in the formation of an O3 phase, which eases the O3–P3 phase transformations . For instance, Na[Li 0.05 (Ni 0.25 Fe 0.25 Mn 0.5 ) 0.95 ]O 2 layered cathode materials demonstrated a very high capacity of 180.1 mA h g −1 at a 0.1C rate and excellent capacity retentions (0.5C rate: 92.1%) and good rate capabilities at various C‐rates, which are much higher than those of the lithium‐free cathode .…”

Section: Monoanion Compoundsmentioning

confidence: 99%

“…[90] For O3-type oxides, the introduction of Li + is thought to be favorable for enhancing the electrochemical performance as Li + ions assist in the formation of an O3 phase, which eases the O3-P3 phase transformations. [91] For instance, Na [Li 0.05 ) and good rate capabilities at various C-rates, which are much higher than those of the lithium-free cathode. [92] In addition to the above elemental strategies, nanoscale interface engineering is an effective tool to enhance the cathode performance.…”

Section: Mixed-cation Oxidesmentioning

confidence: 99%

Advanced Cathode Materials for Sodium‐Ion Batteries: What Determines Our Choices?

et al. 2017

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lithium with cheaper alternatives might make future batteries less susceptible to price fluctuations when the market expands. [5] This concern has in turn spawned a flurry of research activity to look beyond LIB technology. In view of the various rechargeable batteries, sodiumion batteries (SIBs) that consist of a main element of seawater made their presence felt in the battery industry due to their chemical similarity (e.g., only 0.3 V more positive than lithium) but higher abundance compared to lithium, [6] as illustrated in Table 1. SIBs work in the same way as LIBs in that they involve the reversible migration of cations/anions across a separator toward the electrodes to realize voltage-driven electrochemical reactions. [7] The upward trend for sodium-ion battery research is driven by the concern over the scarcity and price rise of lithium. Hence, these major merits, as well as the suitable redox potential (E = 0.3 V vs Li) make the SIB an appropriate choice as a rechargeable battery system.In fact, SIBs started almost in parallel with LIBs in the 1980s but the development of LIBs eventually eclipsed SIBs due to the electrochemical performances of SIBs. [8,9] A major obstacle is that it is difficult to get a sodium host material with comparable operating voltage and capacity as the LIB analogs. Firstly, the larger Na + radius (0.98 Å) than that of Li + (0.69 Å) leads to the kinetically sluggish Na + insertion/extraction and transport cross the host-material framework, which will always make the specific capacity and rate capacity largely degraded. [10] Secondly, the larger volume expansion caused by Na + insertion will also bring a change in the phase and lattice of the host materials, making it difficult to achieve a favorable electrochemical stability compared with the LIB counterparts. [11] In addition, they also suffer from a lower specific energy than LIBs, due to the lower potential and larger atomic weight of sodium. It is still a challenge to build an affordable Na-host materials endowed with a high specific energy (e.g., 500 W h kg −1 in LIBs). [12] Recently, the topic of SIBs was revisited in the hope of exploring possible ways to overcome the concerns about the low energy density and poor cycling life of SIBs.In spite of the above distinct drawbacks, SIBs can actually behave slightly differently in some chemical aspects. For instance, sodium does not react with aluminum, which is contrary to the alloying tendency of lithium. In the commercial market, manufacturers could appreciate this "inertness" to reduce the production cost of batteries by substituting the Among the various energy solutions, lithium-ion batteries (LIBs) play an important role in the process of the transition from fossil fuels to renewables. However, the necessity to replace lithium with cheaper alternatives due to its scarcity has recently attracted great interest to developing sodium-ion batteries (SIBs). Hence, the discovery and development of suitable cathode materials that exhibit high specific capacity, good cycling stabil...

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Local Structural Distortion Induced Uniaxial Negative Thermal Expansion in Nanosized Semimetal Bismuth

Cited by 28 publications

References 42 publications

Carbon Dioxide Electroreduction into Syngas Boosted by a Partially Delocalized Charge in Molybdenum Sulfide Selenide Alloy Monolayers

Carbon Dioxide Electroreduction into Syngas Boosted by a Partially Delocalized Charge in Molybdenum Sulfide Selenide Alloy Monolayers

Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Advanced Cathode Materials for Sodium‐Ion Batteries: What Determines Our Choices?

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