APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Haijun Wang,Jin-Le Lan,Haocheng Yuan,Shicheng Luo,Yiqian Huang,Yunhua Yu,Qing Cai,Xiaoping Yang
Microstructure design combined with high-level heteroatoms doping has been considered the leading approach for preparing the high-performance carbon anodes for sodium-ion batteries (SIBs). Herein, a hollow porous carbon sphere (NP-HPCS) that exhibits a high N, P co-doping level (6.05 at% for N, 5.19 at% for P) and a large microporous specific area (339 m 2 g −1 ) is reported. The microporous and N, P co-doping synergistic construction of the NP-HPCS was achieved by a high-efficiency chemical grafting of hexachlorocyclotriphosphazene (HCCP) onto polydopamine (PDA) shell, accompanied by the in situ micellar transformation of pore-forming agent F127 in the grafting process. The as-prepared NP-HPCS used as an anode for SIBs delivers a superior rate capacity (~101 mAh g −1 at 20 A g −1 ) and an excellent long cycle performance (~120 mAh g −1 after 5000 cycles at 5 A g −1 ). The kinetics analysis and density functional theory (DFT) calculations were carried out to further analyze the superior sodium storage performance of NP-HPCS. Our work suggests an effective way to develop high-performance carbon anode materials for SIBs.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2011
·
IF 3.074
Ting Wu,Xiang Cai,Shaozao Tan,Hongye Li,Jiesheng Liu,Weidong Yang
In order to explore the potential of graphene (G) in removal of hazardous chemicals in waste water, chemically reduced graphene oxide was employed as the adsorbent and the adsorption characteristics of graphene toward acrylonitrile (AN), p-toluenesulfonic acid (p-TA), 1-naphthalenesulfonic acid (1-NA) and methyl blue (MB) were evaluated under laboratory conditions. The results showed that the organic chemicals with larger molecule size and more benzene rings possessed a higher adsorption speed and a higher maximum adsorption capacity on G. The maximum adsorption capacities of p-TA, 1-NA and MB on G are ∼1.43 g/g G, ∼1.46 g/g G and ∼1.52 g/g G at 30 °C, respectively, which are the highest values of p-TA, 1-NA or MB adsorption on different kinds of today's nanomaterials. Under the maximum adsorption capacity, the absorption quantity of MB on G was dependent on the initial concentration of MB, and higher temperature could facilitate the adsorption process. The G efficiency remains almost constant during the first five cycles of the adsorption–desorption process. In addition, the fluorescence spectra implied that the adsorption of MB on G was a π–π stacking adsorption process. In conclusion, the G could serve as a promising adsorbent for the removal of chemicals containing benzene rings in waste water.
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 4
·e6147
·
IF 4.105
Sujuan Ge,Yuming Zhou,Xiaoli Sheng,Chunfeng Mao,Lina Zhao,Jianxing Xu,Lei Qiu
Piperidinium-based ionic liquids (ILs) were synthesized under mild conditions by coordinating N -alkyl- N -methylpiperidinium bromide ([Pip 1,x ]Br) with anhydrous AlCl 3 . The weak basicity of N -methylpiperidine had little impact on downstream problems from proton impurities and catalyst poisoning. The results of Fourier transform infrared (FT-IR), electrospray ionization mass spectrometry (ESI-MS), and nuclear magnetic resonance ( 27 Al NMR) confirmed that the active components in [Pip 1,x ]Br-2AlCl 3 ( χ = 0.67) were [Al 3 Cl 9 Br] − and [Al 2 Cl 6 Br] − . Besides, the reaction performance of [Pip 1,8 ]Br-2AlCl 3 under different conditions was carried out by single-factor experiment and further confirmed by orthogonal experimental method. Among these reaction conditions, the optimal combination was the reaction temperature of 40°C, ILs/O molar ratio of 0.2:1, px/O molar ratio of 12:1, and the reaction time of 30 min. Furthermore, [Pip 1,8 ]Br-2AlCl 3 had excellent stability and can be recycled 14 times. It was the high-efficiency catalytic activity and prominent recyclability that made continuous industrial production possible.
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2013
·Vol. 299
·期 3
·361-367
·
IF 2.338
Weining Sun,Xiaofeng Lu,Yanpeng Xue,Yan Tong,Ce Wang
In this report, CoFe 2 O 4 /Polypyrrole (PPy)/Pd ternary composite nanofibers are fabricated through a one-step redox reaction between pyrrole and Na 2 PdCl 4 in the presence of electrospun CoFe 2 O 4 nanofibers in ethylene glycol (EG). The generation of Pd nanoparticles is accompanied by the formation of PPy on the surface of electrospun CoFe 2 O 4 nanofibers during the redox reaction. The as-prepared CoFe 2 O 4 /PPy/Pd composite nanofibers may be used as efficient catalysts for the p -nitrophenol hydrogenation with an apparent rate constant ( k app ) of about 13.2 × 10 −3 s −1 . The CoFe 2 O 4 /PPy/Pd composite nanofibers show good magnetic properties, which can be readily recycled under an external magnetic field.
✓ 已验证
DOI
高影响因子
2D Materials
·
2017
·Vol. 4
·期 2
·025097
·
IF 6.937
Yan Wang,Wu-Xing Zhou,Le Huang,Congxin Xia,Li-Ming Tang,Hui-Xiong Deng,Yongtao Li,Ke-Qiu Chen,Jingbo Li,Zhongming Wei
P–n junctions based on vertically stacked van der Waals (vdW) materials have attracted extensive attentions and may offer novel physical performances for the design of next-generation electronics. Here, vertically stacked p-WSe2/n-SnS2 heterostructures have been fabricated by a polymethyl methacrylate (PMMA)-assisted transfer method. The unique electronical properties and self-driven photoelectric characteristics of the heterostructures are measured. The transfer current of the heterostructures show gate-tunable 'anti-ambipolar' behavior under dark condition with the maximum of the on/off ratio exceeding 105, while under light illumination it triggers double 'on' state anti-ambipolar behavior. The 'anti-ambipolar' behavior under dark condition and the 'on' state I under light illumination is originating from the in series of p-channel in WSe2 and n-channel in SnS2, while the 'on' state II can be attributed to the gate-controlled Schottky barrier modulation between the heterostructure and the Au electrodes. The heterostructure also shows self-driven photoswitching performance under 532 nm laser, which can be attributed to the type-II band alignment and the build-in potential of p–n heterostructure.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Yan Li,Xue Li,Xiao-Tian Wang,Li-Juan Jian,Nihad Ibrahim Mohammed Abdallah,Xiao-Fei Dong,Cheng-Wei Wang
Constructing high efficient nanostructured photocatalysts is meaningful for dyeing wastewater treatment . Herein, a new p-n heterostructured photocatalyst of NiS/BiVO 4 (NiS/BVO) was well designed, synthesized and applied to photodegrade anion organic dye. Coupling p-type NiS nanoparticles on n-type decahedral nanostructured BVO cannot obviously increase the specific surface area , but can effectively increase the light harvesting, enhance the photocurrent response, and promote the separation and transfer of the photo-generated electron-holes. As a result, 0.7 molar ratio of NiS/BVO exhibited the best photocatalytic capability of 95.6 % within 90 min irradiation, possessing the highest degradation rate of 1.7970 h −1 , which is almost 16 and 33 times higher than pure BVO (15.8 %, 0.1134 h −1 ) and NiS (7.9 %, 0.0543 h −1 ). Meanwhile, NiS/BVO has well photocatalytic stability in at least five cycling tests.
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Zongqiu Li,Shengzhe Jia,Ye Gao,Mengwei Wang,Wei Hong,Zhenguo Gao,Junbo Gong
The molecular structure properties of p -aminobenzoic acid (PABA) were investigated both in the solid and liquid phases. The Hirshfeld surface analysis method was used to estimate the percentage contribution of various intermolecular contacts in the solid-state structure. In addition, the solubility of PABA was tested in twelve different solvents by the gravimetric method at temperatures ranging from 283.15 K to 323.15 K. The concentration calibration model established by ATR-FTIR was used to calculate the solubility in ethanol. The results agreed well with the experimental results with a deviation of less than 5%. Furthermore, four thermodynamic models were used to check and correlate the solubility results. The relative standard deviation ( ARD ) values were less than 10%, indicating a good agreement with the experimental results. The thermodynamic properties of mixing ( Δ mix G, Δ mix H, and Δ mix S ) were calculated using the NRTL equation. Besides, the physicochemical properties of different solvents were investigated to determine the solvent effects . The results indicated that solvent properties such as polarity, viscosity, and cohesive energy density , exhibited synergistic effects on the solubility in different solvent systems. Finally, molecular dynamic simulations , including solvation free energy and radial distribution function analysis, were used to successfully determine the solubility behavior.
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2024
·
IF 0
Jiao Yang Lu,Zhen Qi Bu,Donghua Wang,Binsheng He,Wei Tao Huang
Nanocomposites have gained significant attention for various applications, such as sensing, catalysis, and energy. While graphene–silver and other similar combinations have been extensively explored, the synthesis of nanocomposites based on antimony and noble metals (such as silver and gold) remains unexplored. In this study, we introduced an approach for preparing silver nanoparticle (AgNP)-decorated antimony trioxide nanocomposites (Sb2O3–Ag) with exceptional catalytic properties. These nanocomposites, synthesized rapidly using antimonene (AM) and Ag+ precursors under microwave-assisted heating, exhibited promising catalytic performance. Characterization techniques, including transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FTIR), confirmed the formation of Sb2O3–Ag nanocomposites, showcasing AgNPs dispersed on the surface of large irregular Sb2O3 particles. Evaluation of catalytic activity using p-nitrophenol (PNP) degradation revealed a rapid elimination rate of approximately 91.6% within 2 s. Several experimental parameters, such as the ratios of AM and Ag+ concentrations and the catalyst amount, were optimized to establish the best reaction conditions for PNP degradation. Furthermore, the sustained catalytic activity of Sb2O3–Ag nanocomposites over 1 month underscores their potential for long-term applications. Analysis through electron paramagnetic resonance spectroscopy suggests the generation of hydroxyl radicals responsible for PNP decomposition, supported by a proposed degradation pathway using electrospray ionization mass spectrometry. This study not only introduces a bimetallic nanomaterial based on Sb and Ag but also provides a sustainable solution for organic pollutant degradation.
✓ 已验证
DOI
RSC Advances
·
2021
·Vol. 11
·期 53
·33373-33379
·
IF 3.361
Lejie Zhu,Jianmin Luo,Guohui Dong,Yun Lu,Yinlong Lai,Jun Liu,Guanmei Chen,Yi Zhang
As a kind of metal-free organic semiconductor photocatalyst, g-C3N4 has been widely explored for use in photocatalysis. However, the low quantum yield, small absorption range, and poor conductivity limit its large-scale application. Introducing another kind of semiconductor, particularly an oxide semiconductor, can result in some unexpected properties, such as an improved change transfer, enhanced light absorption, and better conductivity. In this work, CuO/g-C3N4 is successfully prepared through an impregnation and post-calcination method. A series of measurements support the formation of an organic-inorganic hybrid p–n heterojunction at the CuO (p-type) and g-C3N4 (n-type) interface. Furthermore, the photoactivity of the composite is evaluated via photocatalytic NO removal and the visible degradation of rhodamine B (RhB). Results show that the photocatalytic properties of CuO/g-C3N4 are almost twice as high as those of g-C3N4. In comparative tests, the photocatalytic degradation performance of Mix-CuO/g-C3N4 (the mixture of CuO and g-C3N4 nanosheets prepared by mechanically mixing) is even lower than that of pure g-C3N4. The degradation of RhB is only 19.7% under visible light after 30 min of irradiation. The improvement in the photoactivity of CuO/g-C3N4 results from the built-in electric field close to the formed p–n heterojunction, which switches the electron transfer mechanism from a double-charge transfer mechanism to a Z-scheme mechanism. In addition, the formed p–n heterojunction favors charge transfer, and thus the photocatalytic performance is significantly improved.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bao Ren,Mingkang Xu,Jiaqiang Zhu,Zichang Xia,Chunfu Liu,Fanfei Min
The hydration characteristics of fine particles significantly influence the settling and dewatering of tailings. However, the current limited understanding of the micro-mechanisms governing the interactions between hydrophobic flocculants and fine particles hinders the optimization of tailings treatment technical. Through a combination of MD simulations, flocculation settling, and adsorption capacity analysis, the hydrophobic adsorption mechanism of P(AM-MAPTAC-TEMAc6) at the kaolinite/water interface was elucidated. Results suggested that hydrogen bonding and non-bond interactions synergistically drive the adsorption of P(AM-MAPTAC-TEMAc6) onto the kaolinite surface. As the mass concentration of P(AM-MAPTAC-TEMAc6) increased, the hydrophobic and associative interactions between the molecular chains enhanced the adsorption amount on kaolinite particles, leading to a notable decrease in the solution residual amount and the supernatant turbidity. P(AM-MAPTAC-TEMAc6) improved the dewatering performance of concentrated tailings by reducing the hydration film density on kaolinite surfaces, thus decreasing the compression layer thickness. The fluorocarbon side chains of P(AM-MAPTAC-TEMAc6) enhance the hydrophobic adsorption capacity of cationic side chains in the surface water region. Simultaneously, the associative interactions of the molecular chains in the bulk water region promote enhanced diffusion and migration, thereby strengthening the bridging mechanism between P(AM-MAPTAC-TEMAc6) and kaolinite particles, ultimately improving the settling and dewatering efficiency of the suspensions.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhe Xu,Xiao-Lei Shi,Yibo Zhang,Jisheng Liang,Meng Li,Chengyan Liu,Lei Miao,Siqi Liu,Shihao Wang,Qi Zhou,Jie Gao,Zhongwei Zhang,Wei-Di Liu,Ying Peng,Jun-Liang Chen,Zhi-Gang Chen
Owing to the non-toxicity and low cost, Mg 3 Sb 2 -based Zintls are promising candidates for mid-temperature thermoelectric applications. However, the thermoelectric performance of p-type Mg 3 Sb 2 is significantly lower than that of n-type ones. Here, we achieve simultaneous optimization of the band structure and enhanced phonon scattering through the combined doping of Na at the cation site and Bi at the anion site, leading to a competitive figure of merit, ZT of 0.73 at 773 K and a maximum theoretical energy conversion efficiency of 6.5 % at a temperature difference of 450 K. First-principles calculations indicate that Na and Bi co-doping effectively narrows the band gap and shifts the Fermi level into the valence band, thereby increasing the hole carrier concentration. This ensures a relatively high Seebeck coefficient and improved electrical conductivity, resulting in an excellent power factor of 7.5 µW cm −1 K −2 . Additionally, by adjusting the amount of Bi nanoprecipitates in the matrix, the heterogeneous interfaces significantly enhance phonon scattering and markedly reduce the lattice thermal conductivity (0.52 W m −1 K −1 ), collectively leading to the high thermoelectric performance. Furthermore, by pairing n-type Mg 3.18 Y 0.02 Sb 1.5 Bi 0.49 Se 0.01 , a double-leg thermoelectric device achieves an energy conversion efficiency of 4.1 % with a temperature difference of 390 K.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Jiajia Ye,Xuting Li,Guang Xia,Guanghao Gong,Zhiqiang Zheng,Chuanzhong Chen,Cheng Hu
We report for the first time a Na-ion battery anode material composed of P-doped CoSe 2 nanoparticles (P-CoSe 2 ) with the size of 5–20 nm that are uniformly embed in a 3D porous honeycomb-like carbon network. High rate capability and cycling stability are achieved simultaneously. The honeycomb-like carbon network is rationally designed to support high electrical conductivity, rapid Na-ion diffusion as well as the accommodation of the volume expansion from the active P-CoSe 2 nanoparticles. In particular, heteroatom P-doping within CoSe 2 introduces stronger P-Co bonds and additional P-Se bonds that significantly improve the structure stability of P-CoSe 2 for highly stable sodiation/desodiation over long-term cycling. P-doping also improves the electrical conductivity of the CoSe 2 nanoparticles, leading to highly elevated electrochemical kinetics to deliver high specific capacities at high current densities. Benefiting from the unique nanostructure and atomic-level P-doping, the P-CoSe 2 (2:1)/C anode delivers an excellent cycle stability with a specific capacity of 206.9 mA h g −1 achieved at 2000 mA g −1 after 1000 cycles. In addition, this material can be synthesized using a facile pyrolysis and selenization/phosphorization approach. This study provides new opportunities of heteroatom doping as an effective method to improve the cycling stability of Na-ion anode materials.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）