APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 10
·e5814
·
IF 3.14
Yongcen Lin,Xue Dong,Lang Zhao
N-ZIF-(1:0)@NiCo-LDH, N-ZIF-(1:3.5)@NiCo-LDH and N-ZIF-(0:1)@NiCo-LDH were prepared by mixing solvents in various volume ratios ( V methanol : V water = 1:0, 1:3.5 and 0:1) when synthesizing precursors. These composite materials were characterized using scanning and transmission electron microscopies, X-ray diffraction, X-ray photoelectron spectroscopy and nitrogen adsorption–desorption measurements, and investigated as catalysts for reduction of 4-nitrophenol, methyl orange and methylene blue. The NaBH 4 concentration as an important factor that may affect catalytic activity for reduction of 4-nitrophenol was examined. Under optimal experimental conditions, the excellent catalytic activity of the N-ZIF-(0:1)@NiCo-LDH composite, compared to that of N-ZIF-(1:0)@NiCo-LDH and N-ZIF-(1:3.5)@NiCo-LDH composites, could be attributed to the presence of graphitic nitrogen. In addition, compared with previously reported catalysts, all catalysts prepared show excellent catalytic activity owing to the unique structure exposing more active sites.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jinghui Zhu,Ya Liu,Liubiao Zhong,Jianyong Wang,Huanhui Chen,Sanfei Zhao,Yejun Qiu
Herein, a novel composite nanofiber , which consists of TiO-TiO 2 heterostructure nanoparticles and boron, nitrogen co-doped carbon nanofibers (BNCNF), has been successfully prepared through a facile electrospinning method. Remarkably, as interlayer for Li S batteries, the TiO-TiO 2 heterostructure not only enhances the adsorbability of the interlayer to lithium polysulfides (LiPSs) via the Lewis acid-base interactions, but also accelerates the redox reaction kinetics of the Li S batteries dramatically. Moreover, the BNCNF as a flexible framework can remit the volumetric change of the sulfur cathode, physically retard the migration of LiPSs and chemically adsorb to the LiPSs. Attributing to the synergistic effect of TiO-TiO 2 nanoparticle and BNCNF membrane, the Li S batteries with the novel composite interlayer (named as TiO-TiO 2 /BNCNF) exhibit outstanding cycling stability and high discharge capacity, especially at high current density. With the sulfur loading of 2.5 mg cm −2 , the cell with the TiO-TiO 2 /BNCNF interlayer delivers a high initial discharge capacity of 1014.7 mA h g −1 with a decay rate of 0.092% over 400 cycles at 0.5C, and also possesses excellent initial discharge capacity of 650.0 mA h g −1 with a decay rate of 0.068% over 120 cycles even at 2.0C.
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Advanced Science
·
2024
·Vol. 11
·期 28
·2401730
·
IF 14.3
Qian Yao,Cheng Zheng,Kejun Liu,Mingyue Wang,Jinmei Song,Lifeng Cui,Di Huang,Nana Wang,Shi Xue Dou,Zhongchao Bai,Jian Yang
Sodium ion batteries (SIBs) are considered as the ideal candidates for the next generation of electrochemical energy storage devices. The major challenges of anode lie in poor cycling stability and the sluggish kinetics attributed to the inherent large Na + size. In this work, Bi nanosphere encapsulated in N-doped carbon nanowires (Bi@N-C) is assembled by facile electrospinning and carbonization. N-doped carbon mitigates the structure stress/strain during alloying/dealloying, optimizes the ionic/electronic diffusion, and provides fast electron transfer and structural stability. Due to the excellent structure, Bi@N-C shows excellent Na storage performance in SIBs in terms of good cycling stability and rate capacity in half cells and full cells. The fundamental mechanism of the outstanding electrochemical performance of Bi@N-C has been demonstrated through synchrotron in-situ XRD, atomic force microscopy, ex-situ scanning electron microscopy (SEM) and density functional theory (DFT) calculation. Importantly, a deeper understanding of the underlying reasons of the performance improvement is elucidated, which is vital for providing the theoretical basis for application of SIBs.
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JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 4
·1-11
·
IF 1.53
Yang Zhouxiaoshuang,Wang Feng,Liu Hui
With the spiropyran-containing compound as the initiator, dual responsive spiropyran-ended poly(N-vinyl caprolactam) (SP-PNVCL) was synthesized by atom transfer radical polymerization. The structure of the resulting polymer was characterized by 1 H NMR and gel permeation chromatography, and the polymer had both reversible light-responsive and thermo-sensitive behaviors. Metal ions could be bound between merocyanine formed by photoisomerization of spiropyran and the amino group of N-vinyl caprolactam unit through synergetic coordination. The complexation of SP-PNVCL with several metal ions was investigated by UV-Vis absorption spectroscopy, and it was found that SP-PNVCL might be used as a potential recognition probe for Fe 2+ , accompanied by obvious color change from colorless to brown by naked eye. The detection limit and photo-reversible recyclable behaviors of SP-PNVCL for Fe 2+ were also investigated in details. The kind of spiropyran-ended poly(N-vinyl caprolactam) had great application potential in environment protection and biological area.
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高影响因子
HEAT AND MASS TRANSFER
·
2021
·Vol. 58
·期 3
·407-417
·
IF 2.464
Zhang Dongxue,Wang Xin,Dong Yantao,Lu Nan,Lan Xiaozheng
Normal alkane tetracosane (C 24 ) as a representative compound containing alkyl chains was loaded into various porous materials to obtain form-stable phase change materials (PCMs). In the pores of controlled porous glasses (CPGs), silica gels (SGs), SBA-15 and KIT-6, C 24 acquired tunable phase transition temperatures. By changing the pore sizes, C 24 displayed regulated temperature windows of around 6 K (via melting) and 10 K (via solid phase transition) in the CPGs, 9 K in the SG pores (via melting) and about 13 K in SBA-15 (via melting). Phase transition temperatures, degree of supercooling and enthalpies of phase transitions exhibited linear dependence on the reverse pore diameter. The transition temperature and enthalpy change also had relevance to pore geometries. The phase sequences and solid structures of C 24 in the pores changed largely. The study provides an insight into thermal properties of nano-sized PCMs.
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高影响因子
Small
·
2022
·Vol. 18
·期 34
·2201556
·
IF 15.153
Yuxin Liu,Cailing Chen,Yiqiang He,Zhe Zhang,Mingbian Li,Chunguang Li,Xiao-Bo Chen,Yu Han,Zhan Shi
Design and development of highly efficient photocatalytic materials are key to employ photocatalytic technology as a sound solution to energy and environment related challenges. This work aims to significantly boost photocatalytic activity through rich indium vacancies (V In ) In 2 S 3 with atomic p–n homojunction through a one-pot preparation strategy. Positron annihilation spectroscopy and electron paramagnetic resonance reveal existence of V In in the prepared photocatalysts. Mott–Schottky plots and surface photovoltage spectra prove rich V In In 2 S 3 can form atomic p–n homojunction. It is validated that p–n homojunction can effectively separate carriers combined with photoelectrochemical tests. V In decreases carrier transport activation energy (CTAE) from 0.64 eV of V In -poor In 2 S 3 to 0.44 eV of V In -rich In 2 S 3 . The special structure endows defective In 2 S 3 with multifunctional photocatalysis properties, i.e., hydrogen production (872.7 µmol g −1 h −1 ), degradation of methyl orange (20 min, 97%), and reduction in heavy metal ions Cr(VI) (30 min, 98%) under simulated sunlight, which outperforms a variety of existing In 2 S 3 composite catalysts. Therefore, such a compositional strategy and mechanistic study are expected to offer new insights for designing highly efficient photocatalysts through defect engineering.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 19
·
IF 1.86
Xiaohai Bu,Zewu Zhang,Zusheng Hang,Ying Huang,Yuming Zhou
Novel optically active and racemic poly( N -propargylamides) bearing tyrosine pendants (LPT, DPT, and RPT) were synthesized and characterized. The polymers possessed moderate molecular weights and were thoroughly soluble in common organic solvents. The secondary structure of these three polymers in chloroform was studied and the results indicated that LPT and DPT could adopt helical structures with predominantly one-handed screw sense according to their intense Cotton effect and large specific rotation values, while RPT adopted random coiled polymer chain. The amide groups could form amide-amide hydrogen bonds to engender the twist of dihedral angle and the strong steric repulsion of phenol groups might have the opposite effect on the helix. The helical structure of the optically active polymers were conclusively constructed and stabilized by the optimization of intra- and intermolecular hydrogen bonding and steric repulsion of the side chains. Moreover, the infrared emissivity values of LPT and DPT at 30 °C were 0.682 and 0.671, which were much lower than RPT. LPT and DPT also showed superior heat resistance due to their unique helical conformation. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44824.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2013
·
IF 1.304
Ming Jin,Dan Zhao,Guozhen He,Yao Tong,Shiqing Han
An efficient method has been developed for the N -arylation of a variety of water-soluble amino alcohols (1.2 mmol) with aryl iodides (1.0 mmol) in water under CuI-catalyzed conditions. The reaction was conducted via substrate-promoted action and did not require an additional ligand or phase-transfer catalyst, and afforded the desired N -aryl amines in acceptable to excellent yields (64%–93%) under mild reaction conditions with a small excess of the amino alcohol.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Meinan Wan,Mo Xiong,Neng Li,Baoshun Liu,Shuo Wang,Wai-Yim Ching,Xiujian Zhao
Research on monoclinic (M1) phase of VO 2 has attracted a great of interest for smart coating applications due to its exceptional thermochromic property. Herein, we report the results using a novel approach to synthesize N-doped VO 2 (M1) thin films with high purity by heat treatment in NH 3 atmosphere. The N dopant in the film can be regulated by varying NH 3 concentration during the annealing process. We find that the N atoms are located at the interstitial sites or substitute oxygen atoms, and the V-N bonds in the VO 2 thin films increase with NH 3 concentration. The metal to insulator transition (MIT) temperature ( τ c,h ) of the VO 2 thin film is effectively reduced from 80.0 to 62.9 °C, while the solar modulation efficiency (Δ T sol ) and the modulation efficiency at 2000 nm (Δ T 2000nm ) are 7.36% and 55.6% respectively. The band gap of N-doped VO 2 thin films related to MIT ( E g 1 ) is estimated to be as low as 0.18–0.25 eV whereas the band gap associated with the visible transparency ( E g 2 ) is about 1.50–1.58 eV. Based on the highly accurate first-principles calculations, the E g 1 of VO 2 (M1) is reduced after substituted or interstitial N-doping, while the E g 2 alters with the mode of N-doping, which is excellent agreement with experimental measurement.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiangyang Tian,Haoxin Huang,Huiping Zhang,Ying Yan
Four different types of structured nitrogen-doped carbon nanotube membranes (C50, NC25, NC50, N25C25) were used as metal-free catalysts for phenol degradation. Firstly, nitrogen-doped carbon nanotubes were prepared on paper-like sintered stainless steel fibers (PSSF) by chemical vapor deposition using melamine and acetylene as dual precursors, then the nitric acid was used to remove amorphous carbon and catalyst particles in the tubes. Subsequently, TEM, XPS, N 2 adsorption and desorption and other characterization techniques were used to investigate the structure and morphology of the catalysts. Characterization results showed that the use of dual precursor could well adjust the nitrogen content in carbon nanotubes, and nitrogen doping could change the hollow structure of carbon nanotubes into rough bamboo-like and corrugated structure. Meanwhile, acid treatment significantly increased the specific surface area, among which the value of HN25C25 reached 38.15 m 2 /g. Pristine and acid-treated catalysts were then used to activate peroxymonosulfonate (PMS) in a structured fixed bed reactor. NC25 and N25C25 were able to mineralize 46% and 17.5% of phenol at 1 h, but the TOC conversion rate only maintained at about 10% in the subsequent reaction time. After acid treatment, HNC25 and HN25C25 were able to mineralize up to 76% and 84% of phenol, and the TOC conversion rate maintained at about 70% within 7 h. the high leaching of Fe in the acid-treated catalysts could be attributed to the formation of small carboxylic acids and the destruction of the PSSF support during the reaction. At last, radical inhibition experiments and ESR spectra showed that sulfate radicals and hydroxyl radicals were the main active species in the reaction. The increase in the proportion of active nitrogen species and the improvement in contact efficiency could explain the higher mineralization efficiency of phenol catalyst after acid treatment.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 4
·655
·
IF 5.719
Wenjing Yu,Bo Liu,Xiaojiao Zhao
To develop high-performance microwave absorption materials with the features of lightweight, thin thickness, broad bandwidth, and strong absorption, an ultralight Ni3S2@N, S-codoped graphene aerogel with a density of 13.5 mg/cm3has been fabricated by the use of metal-organic frameworks (MOFs) to directly initiate the gelation of graphene oxide strategy. In such a strategy, dual-functional 1D Ni-MOF nanorods not only act as the gelation agent but also afford the doping elements (N and S) originated from the organic species and the precursor for metal sulfide. Due to the synergistic effects of good impedance matching and multiple losses, the optimal reflection loss (RL) of as-prepared Ni3S2@N, S-codoped graphene aerogel reaches −46.9 dB at 17.1 GHz with only 2.0 mm and ultralow filling content (1.75 wt%). The maximum effective absorption bandwidth (EAB) reaches 6.3 GHz (11.7–18.0 GHz) at 2.38 mm, covering the whole Ku band. Moreover, the value of EAB with the RL less than −30 dB can be tuned to 12.2 GHz (5.8–18 GHz) at the absorber thickness ranging from 1.9 to 5.0 mm. This work provides insight for rational design and fabrication of multicomponent-containing graphene aerogels, showing the potential application in lightweight and high-performance microwave absorption.
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高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-12
·
IF 3.998
Bo Caiying,Shi Zhongyu,Hu Lihong,Pan Zheng,Hu Yun,Yang Xiaohui,Jia Puyou,Ren Xiaoli,Zhang Meng,Zhou Yonghong
A novel eco-friendly halogen-free cardanol-based flame retardant with P, Si, and N on the chain backbone (PSNCFR) was synthesized and incorporated into phenolic foams (PFs). PSNCFR was comprehensively investigated via Fourier transform infrared spectroscopy and nuclear magnetic resonance. PSNCFR endowed PFs with flame retardancy, contributed to generating a composite char defense against flames, and efficiently prevented smoking from PFs. PSNCFR introduction improved the flexural strength of the PFs to approximately 155% of that of pristine PF. PSNCFR-modified PFs displayed a high limiting oxygen index value of 41.9%. The results of cone calorimeter show that the mean heat release rate, mean effective heat of combustion, and total heat release of the PSNCFR-modified PFs reduced by 26.92%, 35.71%, and 31.25%, respectively. In particular, the total smoke production of the PSNCFR-modified PFs decreased by 64.55%, indicating excellent smoke inhibition. As for the mechanism, the condensation and gas phases during pyrolysis were responsible for the synergistic flame retardancy in the modified PFs. The findings demonstrate that PSNCFR can be used in PF preparation to overcome their drawbacks of internal brittleness and flammability.
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高影响因子
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