Hierarchically porous boron nitride foams for multifunctional bulk adsorbents

Cao, Chaochao; Yang, Jingwen; Fu, Kun; Zhai, Qinghong; Zhou, Zheng; Ji, Jiawei; Ma, Yuanhui; Zhou, Min; Tang, Chengchun

doi:10.1016/j.cej.2021.129896

Cited by 26 publications

(16 citation statements)

References 69 publications

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“…The N 2 adsorption−desorption isotherm was further used to confirm the hierarchically porous property of BNNSs/CHFs (Figure 1f). The isotherm without an obvious hysteresis loop was ascribed to the classical type I, 32 while the sharply increased adsorption capacity under low P/P 0 (ranging from 0 to 0.01) indicated the existence of massive micropores. Furthermore, the pore size distribution was mainly concentrated at 0.79, 1.18, 1.41, and 2.77 nm, with a total pore volume of 0.42 cm 3 g −1 and a specific surface area of 551.6 m 2 g −1 .…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Enhanced Performance of Li–S Batteries due to Synergistic Adsorption and Catalysis Activity within a Separation Coating Made of Hybridized BNNSs/N-Doping Porous Carbon Fibers

Yang

Qiao

et al. 2022

ACS Appl. Mater. Interfaces

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Lithium–sulfur (Li–S) batteries with high theoretical energy density are considered as the most promising devices for rechargeable energy-storage systems. However, their actual applications are rather limited by the shuttle effect of lithium polysulfides (LiPSs) and the sluggish redox kinetics. Here, the boron nitride nanosheets are homodispersedly embedded into N-doping porous carbon fibers (BNNSs/CHFs) by an electrospinning technique and a subsequent in situ pyrolysis process. The hybridized BNNSs/CHFs can be smartly designed as a multifunctional separation coating onto the commercial PP membrane to enhance the electrochemical performance of Li–S batteries. As a result, the Li–S batteries with extra BNNSs/CHF modification deliver a highly reversible discharge capacity of 830.4 mA h g–1 at a current density of 1 C. Even under 4 C, the discharge specific capacity can reach up to 609.9 mA h g–1 and maintain at 553.9 mA h g–1 after 500 cycles, showing a low capacity decay of 0.01836% per cycle. It is considered that the excellent performance is attributed to the synergistic effect of adsorption and catalysis of the BNNSs/CHF coating used. First, this coating can efficiently reduce the charge transfer resistance and enhance Li-ion diffusion, due to increased catalytic activity from strong electronic interactions between BNNSs and N-doping CHFs. Second, the combination of polar BNNSs and abundant pore structures within the hybridized BNNSs/CHF networks can highly facilitate an adsorption for LiPSs. Here, we believed that this work would provide a promising strategy to increase the Li–S batteries’ performance by introducing hybridized BNNSs/N-doping carbon networks, which could efficiently suppress the LiPSs’ shuttle effect and improve the electrochemical kinetics of Li–S batteries.

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Section: ■ Results and Discussionmentioning

confidence: 95%

Enhanced Performance of Li–S Batteries due to Synergistic Adsorption and Catalysis Activity within a Separation Coating Made of Hybridized BNNSs/N-Doping Porous Carbon Fibers

Yang

Qiao

et al. 2022

ACS Appl. Mater. Interfaces

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“…Besides this, the evolution of samples’ chemical bonding was characterized by FTIR analyses. Their FTIR spectra show two obvious characteristic vibrations at ∼1378.39 and ∼812.86 cm –1 (Figure c), which arise from the in-plane B-N stretching and out-of-plane B-N-B bending vibrations, , respectively. Notably, the two broad vibrations in 3697–3052 and 1200–900 cm –1 ranges gradually fade up with the etching and ball-milling processes.…”

Section: Resultsmentioning

confidence: 99%

Chemo-Mechanically Exfoliated Boron Nitride Nanosheet/Poly(Vinyl Alcohol) Composites as Efficient Heat Dissipation Components

Yang

Cao

Qiao

et al. 2022

ACS Appl. Nano Mater.

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Advanced heat dissipation materials are necessary for powerful and miniaturized electronics. Hexagonal boron nitride (h-BN) is an ideal material for thermal management due to its electrical insulation but thermal conductivity. However, its utilization is seriously restricted by the pulverulence, and multilayer and chemical inertness. Herein, highly functionalized BN nanosheets (BNNSs) are exfoliated by a boric acid-assisted chemo-mechanical method and show stable dispersion in various solvents. An ingenious chemical etch-and mechanical forceinduced exfoliation and functionalization mechanism is proposed. Due to the existence of strong interfacial interaction between BNNSs and poly(vinyl alcohol) (PVA), a series of composite films with excellent thermal stability, low dielectric constant (2−4), negligible dissipation factor (<0.2), good machinability, and flexible bending and folding performances are prepared. The BNNSs' filling content can reach ∼90 wt %, and the BNNSs/PVA films' maximum tensile strength and modulus can be as high as ∼85.5 MPa and ∼7.6 GPa, respectively. Importantly, their in-plane thermal conductivity increases monotonously with the elevated BNNS content and temperature. The maximum thermal conductivity can reach up to 27.3 and 39.3 W•m −1 •K −1 at 25 and 100 °C, respectively. Noteworthily, the BNNSs/ PVA films show rapid thermal diffusion and can be readily designed as efficient heat dissipation components for integrated and intelligent electronic devices.

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“…M·2B was synthesized based on preciously reported works. − Briefly, C 3 N 6 H 6 and H 3 BO 3 with a molar ratio of 1:2 was dissolved in DI water; then, the above mixture was heated to 85 °C under stirring conditions. After ∼30 min, a transparent solution can be obtained.…”

Section: Methodsmentioning

confidence: 99%

Biomimetic, Mechanically Strong Supramolecular Nanosystem Enabling Solvent Resistance, Reliable Fire Protection and Ultralong Fire Warning

et al. 2022

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A graphene oxide (GO)-based smart fire alarm sensor (FAS) has gained rapidly increasing research interest in fire safety fields recently. However, it still remains a huge challenge to obtain desirable GO-based FAS materials with integrated performances of mechanical flexibility/robustness, harsh environment-tolerance, high-temperature resistance, and reliable fire warning and protection. In this work, based on bionic design, the supermolecule melamine diborate (M·2B) was combined with GO nanosheets to form supramolecular cross-linking nanosystems, and the corresponding GO-M·2B (GO/MB) hybrid papers with a nacre-like micro/nano structure were successfully fabricated via a gel-dry method. The optimized GO/MB paper exhibits enhanced mechanical properties, e.g., tensile strength and toughness up to ∼122 MPa and ∼1.72 MJ/m3, respectively, which is ∼3.5 and ∼6.6 times higher than those of the GO paper. Besides, it also shows excellent structural stability even under acid/alkaline solution immersion and water bath ultrasonication conditions. Furthermore, due to the presence of promoting reduction effect and atom doping reactions in GO network, the resulting GO/MB network displays exceptional high-temperature resistance, sensitive fire alarm response (∼0.72 s), and ultralong alarming time (>1200 s), showing promising fire safety and protection application prospects as desirable FAS and fire shielding material with excellent comprehensive performances. Therefore, this work provides inspiration for the design and fabrication of high-performance GO-based smart materials that combine fire shielding and alarm functions.

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Hierarchically porous boron nitride foams for multifunctional bulk adsorbents

Cited by 26 publications

References 69 publications

Enhanced Performance of Li–S Batteries due to Synergistic Adsorption and Catalysis Activity within a Separation Coating Made of Hybridized BNNSs/N-Doping Porous Carbon Fibers

Enhanced Performance of Li–S Batteries due to Synergistic Adsorption and Catalysis Activity within a Separation Coating Made of Hybridized BNNSs/N-Doping Porous Carbon Fibers

Chemo-Mechanically Exfoliated Boron Nitride Nanosheet/Poly(Vinyl Alcohol) Composites as Efficient Heat Dissipation Components

Biomimetic, Mechanically Strong Supramolecular Nanosystem Enabling Solvent Resistance, Reliable Fire Protection and Ultralong Fire Warning

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