Tuning of the Optical, Electronic, and Magnetic Properties of Boron Nitride Nanosheets with Oxygen Doping and Functionalization

Weng, Qunhong; Kvashnin, Dmitry G.; Wang, Xi; Cretu, Ovidiu; Yang, Yijun; Zhou, Min; Zhang, Chao; Tang, Dai‐Ming; Сорокин, Павел Б.; Bandô, Yoshio; Golberg, Dmitri

doi:10.1002/adma.201700695

Cited by 192 publications

(202 citation statements)

References 39 publications

Supporting

Mentioning

188

Contrasting

Order By: Relevance

“…The as-prepared BNNS (Figure 2a) are homogenously and steadily dispersed in isopropanol solvent. [22] The morphologies of BNNS are characterized by atomic force microscopy (AFM, Figure 2c) and the statistical results shows that the lateral size of most BNNS s are in the rage of 0.2-3 µm and thicknesses of ≈15-20 nm (Figure 2d,e), meaning a large aspect ratio of ≈100. [21] This value is the same as intrinsic layered h-BN (hexagonal boron nitride), different from the functionalized ones, indicating the BNNS used inheritate the good insulating properties from the layered precursor after the exfoliation process.…”

Section: Preparation and Characterization Of Gradient-structured Pbpnsmentioning

confidence: 99%

Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density

Jiang

Shen

Cai

et al. 2019

Advanced Energy Materials

138

113

View full text Add to dashboard Cite

Poly(vinylidene fluoride) (PVDF) based polymer nanocomposites with high‐permittivity nanofillers exhibit outstanding dielectric energy storage performance due to their high dielectric permittivities and breakdown strength. However, their discharge efficiency is relatively low (usually lower than 70%), which limits their practical applications. Here, polymer nanocomposites with a novel interpenetrating gradient structure are designed and demonstrated by cofilling a PVDF matrix with barium zirconate titanate nanofibers and hexagonal boron nitride nanosheets via modified nonequilibrium processing. The interpenetrating gradient structure is highly effective in breaking the trade‐off between discharge energy density and efficiency of the corresponding nanocomposite, as indicated by the concomitantly enhanced discharge energy density (U e ≈ 23.4 J cm−3) and discharge efficiency (η ≈ 83%). The superior performance is primarily attributed to the rational distribution of nanofillers in the polymer matrix, which raises the height of the potential barrier for charge injection at the dielectric/electrode interface, suppresses electric conduction and contributes to enhanced apparent breakdown strength. Meanwhile, the gradient configuration allows higher volume fraction of high‐permittivity nanofillers without compromising the breakdown strength, leading to higher electric polarization compared with the random configuration. This work provides new opportunities to PVDF‐based polymer nanocomposites with high energy density and discharge efficiency for capacitive energy storage applications.

show abstract

Section: Preparation and Characterization Of Gradient-structured Pbpnsmentioning

confidence: 99%

Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density

Jiang

Shen

Cai

et al. 2019

Advanced Energy Materials

138

113

View full text Add to dashboard Cite

show abstract

“…In order to tune solid state properties of organic and inorganic compounds, many methods have been developped, such as doping [1][2][3][4] or substitution. [5][6][7][8][9] Among them, co-crystallization, i. e. the crystallization of at least two different compounds together, is studied in both medicinal [10][11][12][13] and materials science.…”

Section: Introductionmentioning

confidence: 99%

Periodic DFT Study of the Effects of Co‐Crystallization on a N‐Salicylideneaniline Molecular Switch

et al. 2019

View full text Add to dashboard Cite

This work aims at better understanding the complex effects of co‐crystallization on a single salicylideneaniline molecular switch, (E)‐2‐methoxy‐6‐(pyridine‐3‐yliminomethyl)phenol (PYV3), which can tautomerize between an enol and a keto form. A combination of periodic boundary conditions DFT and molecular wavefunction calculations has been adopted for examining a selection of PYV3 co‐crystals, presenting hydrogen bonds (H‐bonds) or halogen bonds (X‐bonds), for which X‐ray diffraction data are available. Three aspects are targeted: i) the energy (H‐bond strength, enol to keto relative energy, and geometry relaxation energies), ii) the geometrical structure (PYV3 to co‐crystal and enol to keto geometrical variations), and iii) the electron distribution (PYV3 to co‐crystal and enol to keto Mulliken charge variations). These allow i) explaining the preference for forming H‐bonds with the nitrogen of the pyridine of PYV3 with respect to the oxygens and the importance of the crystal field, ii) distinguishing the peculiar behavior of the SulfonylDiPhenol (SDP) coformer, which stabilizes the keto form of PYV3, iii) describing the relative stabilization of the enol form upon co‐crystallization (with the exception of SDP) and therefore iv) substantiating the co‐crystallization‐induced reduction of thermochromism observed for several PYV3 co‐crystals.

show abstract

“…In situ TEM has been widely applied to reveal the underlying mechanisms of rechargeable batteries, including LIBs, Li–O 2 batteries, Li–S batteries, lithium metal batteries, sodium‐ion batteries, sodium–O 2 batteries, and Li–Se batteries …”

Section: Energy Storagementioning

confidence: 99%

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

et al. 2019

Self Cite

View full text Add to dashboard Cite

replacing gasoline, diesel, or other types of fuels with electricity, it is expected that our world will become more environmentally friendly by storing energy directly from sustainable sources, such as solar, wind, geothermal, bioenergy, and the ocean. Even Australia, as a country with abundant energy resources, has identified energy as one of the key scientific research priorities. It is clear that the efficiency of energy harvesting and consumption must be improved, emissions must be reduced, and the integration of various energy sources into the electricity grid and chemical storage must be implemented. A desirable outlook is one with a variety of energy sources and mechanisms that significantly reduces carbon emissions and is economical for consumers and society. Recent fast-growing research should boost the development of reliable, highly efficient, low-cost, and sustainable energy materials that are effective for new technologies and that satisfy the growing demand for energy storage and climate change solutions.The progress in energy materials is indeed significant, however, as the expectations of energy materials research are always quite high, it is not sufficient. Particularly, the material performances are always theoretically predicted but are limited by the underlying mechanisms in real applications. As a wellknown example, silicon is expected to deliver a high theoretical capacity of 4200 mAh g −1 in the form of Li 4.4 Si, and is thought to replace the currently commercial graphite with a capacity of 372 mAh g −1 . However, in real applications, it is found that Si exhibits more than 360% of volume expansion during lithiation, which leads to battery anode failure. In the last few years, TEM, especially in situ TEM, has provided exceptional advantages in investigating the lithiation process of silicon anodes: direct imaging, full crystallography information, and real-time recording have all become possible. By directly observing the charge/discharge processes of Si anodes, the dynamics of expansion have been well understood. The research has then been focused on structural designs of composites containing Si to overcome the expansion. The Si composites (for instance, carbon-wrapped Si nanoparticles with different sizes) were directly analyzed by in situ TEM to determine the best structural design. [12] From 2012, in situ TEM became an essential tool to review and evaluate structural designs for high-capacity anodes with significant volume expansions. The same scenarios apply to similar research topics. In situ transmission electron microscopy (TEM) is one of the most powerfulapproaches for revealing physical and chemical process dynamics at atomic resolutions. The most recent developments for in situ TEM techniques are summarized; in particular, how they enable visualization of various events, measure properties, and solve problems in the field of energy by revealing detailed mechanisms at the nanoscale. Related applications include rechargeable batteries such as Li-ion, Na-ion, Li-O 2 , Na-O 2 , Li...

show abstract

Tuning of the Optical, Electronic, and Magnetic Properties of Boron Nitride Nanosheets with Oxygen Doping and Functionalization

Cited by 192 publications

References 39 publications

Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density

Polymer Nanocomposites with Interpenetrating Gradient Structure Exhibiting Ultrahigh Discharge Efficiency and Energy Density

Periodic DFT Study of the Effects of Co‐Crystallization on a N‐Salicylideneaniline Molecular Switch

Recent Progress of In Situ Transmission Electron Microscopy for Energy Materials

Contact Info

Product

Resources

About