ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaona Chen,Linan Feng,Penglu Yu,Chan Liu,Jinle Lan,Yuan-Hua Lin,Xiaoping Yang
Flexible thermoelectric materials and devices have gained wide attention due to their capability to stably and directly convert body heat or industrial waste heat into electric energy. Many research and synthetic methods of flexible high-performance p-type thermoelectric materials have made great progress. However, their counterpart flexible n-type organic thermoelectric materials are seldom studied due to the complex synthesis of conductive polymer and poor stability of n-type materials. In this work, bismuth tellurium (Bi2Te3) nanosheets are in situ grown on single-walled carbon nanotubes (SWCNTs) assisted by poly(vinylpyrrolidone) (PVP). A series of flexible SWCNTs@Bi2Te3 composite films on poly(vinylidene fluoride) (PVDF) membranes are obtained by vacuum-assisted filtration. The high electrical conductivity of 253.9 S/cm, and a corresponding power factor (PF) of 57.8 μW/m·K2 is obtained at 386 K for SWCNTs@Bi2Te3-0.8 film. Moreover, high electrical conductivity retention of 90% can be maintained after a 300-cycle bending test and no obvious attenuation can be detected after being stored in an Ar atmosphere for 9 months, which exhibits good flexibility and excellent stability of the SWCNTs@Bi2Te3 composite films. This work shows a convenient method to fabricate n-type and flexible thermoelectric composite film and further promotes the practical application of n-type flexible thermoelectric materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 6
·3770-3776
·
IF 3.361
Guangtao Qian,Fengna Dai,Haiquan Chen,Mengxia Wang,Mengjie Hu,Chunhai Chen,Youhai Yu
5-Amine-2-(4-amino-benzene)-1-phenyl-benzimidazole (N-PhPABZ) was successfully synthesized and polymerized with 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA) to obtain a novel N-phenyl-poly(benzimidazole imide) (N-Ph-PBII). The successful incorporation of N-phenyl addressed the issue of high H2O-absorption of traditional PBIIs while retained the superheat resistance property. The resulting N-Ph-PBII possessed a high glass-transition temperature (Tg) up to 425 °C and a low affinity for water of 1.4%. Furthermore, the loose molecular packing and noncoplanar structures led to an increase in optical transparency for the modified PBII.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mengge Shang,Jing Zhang,Xiaochan Liu,Yi Liu,Sipeng Guo,Shimo Yu,Serguei Filatov,Xibin Yi
A novel N, S self-doped hollow-sphere porous carbon is directly prepared from abundant biomass puffball spores via a simple carbonization and KOH activation process for the first time. The electrochemical properties and porous structure of these carbons are explored by adjusting the amount of KOH. It is found that the obtained N, S self-doped hollow-sphere porous carbon with a KOH to carbon mass ratio of 4 (NS-HPC-4) exhibits the largest specific surface area (1431 m 2 /g), a well-developed hierarchical porous structure and moderate N/S contents. As a result, the NS-HPC-4 electrode in the supercapacitor delivers a large specific capacitance of 285 F/g at 0.5 A/g in KOH electrolyte. Furthermore, the symmetric supercapacitor based on NS-HPC-4 exhibits an energy density of 10.9 Wh/kg at a power density of 400.4 W/kg in 2 M KOH aqueous electrolyte, and achieves a high energy density of 58.4 Wh/kg at a high power density of 876.0 W/kg in 1 M Et 4 NBF 4 /AN organic electrolyte. These excellent results confirm that puffball spores derived porous carbons are promising candidates to be used in high performance supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yihao Liu,Riyue Ge,Yingying Chen,Mengqiu Huang,Ruijie Zhu,Wenxian Li,Yi Liu,Lingyan Feng,Renchao Che
The electrocatalytic water splitting into oxygen (O 2 ) and hydrogen (H 2 ) is one of promising technique for addressing the problem of energy shortage. Owing to the sluggish reaction kinetics for oxygen evolution reaction (OER), it is urgent to explore efficient and inexpensive OER electrocatalytic materials. Herein, a highly efficient three-dimensional (3D) hybrid of anions (Cl − and CO 3 2− ) doped cobalt hydroxide catalyst coupled with nitrogen-doped carbon dots (Co(OH) 2 @NCDs) is reported via a simple in situ hydrothermal method. Interestingly, the additional mass ratio of NCDs in Co(OH) 2 hybrid has strong influence on the morphology of as-prepared composites. The well-defined urchin-like Co(OH) 2 @NCDs composite exhibits superior OER performance, achieving the low overpotential ( η ) of 296 mV at 10 mA cm −2 and high durability in 1 M KOH solution. The urchin-like Co(OH) 2 @NCDs catalyst could achieve 29-fold electrochemical active surface area than that of the pure Co(OH) 2 . Additionally, after coupling with NCDs, analysis result shows new Co-N charge transfer channel is generated in hybrid and an optimized electronic environment is originated from the strong electronic interaction among Co atom and NCDs, which can provide efficient charge channels for the rapid electron transfer and further improve the intrinsic activity and promote the OER kinetics. The work may endow a new strategy for the construction of excellent transition metal-based hydroxide water oxidation electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2021
·
IF 2.775
Junwei Cui,Jiangtao Wu,Shengshan Bi
Systems in connection with hydrocarbons with dissolved carbon dioxide (CO 2 ) are widespread in various chemical and engineering applications such as Fischer–Tropsch (FT) synthesizes, carbon capture and storage (CCS) and enhanced oil recovery (EOR). The thermophysical properties are necessary for understanding and designing those relevant processes. In this work, the liquid viscosity, interfacial tension, thermal diffusivity and mutual diffusivity of n -tetradecane with dissolved CO 2 were investigated under macroscopic equilibrium from 323 to 473 K and over a pressure range up to 5.6 MPa. With a careful evaluation of the uncertainty, the average expanded uncertainty of liquid viscosity, surface tension, thermal diffusivity and mutual diffusivity was 2.9%, 2.4%, 11.4% and 4.4%, respectively. The liquid viscosity and interfacial tension decline when the pressure of the system or the mole fraction of CO 2 in the liquid phase increases. Empirical correlations were used to represent the liquid viscosity and interfacial tension with an absolute average deviation (AAD) of 2.8% and 0.2 mN · m − 1 . A comparison of available liquid viscosity and interfacial tension from the literature were performed. In the overlapped temperature and pressure region, good agreement can be found. In terms of the thermal diffusivity, there is no obvious dependency on pressure. The mutual diffusivity decreases with pressure at 323 K, while the decline behavior cannot be observed above 323 K when taking the combined uncertainty into consideration. This work was expected to provide reliable and accurate fundamental thermophysical properties of liquid with dissolved gas systems in engineering and chemical processes.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yinghui Sun,Guojie Zhang,Haizhu Cheng,Jun Liu,Guoqiang Li
The mechanism and kinetic features of dry reforming with methane (DRM) over Ca promoted 1Co–1Ce/AC-N catalyst was investigated. The mechanistic pathway studies have conducted by FTIR and XPS analysis, structure-activity correlations demonstrated the CH 4 and CO 2 could adsorb on catalyst active sites and generate intermediate CH x , OH and CH x O, continue to generate CO and H 2 and then desorbed from active sites. Moreover, CH 4 could also oxidized by Ce 4+ and CO 2 reduced by Ce 3+ , the same content of Ce 4+ and Ce 3+ on promoted catalyst greatly improved the reaction rate. The kinetic of dry reforming with methane was examined for temperature between 650 and 850 at 800 °C. The research was carried out by changing the CH 4 /CO 2 ratios between 0.3 and 3.0. The obtained experiment data were fitted by three typical kinetic models (Power Law, Eley-Rideal and Langmuir-Hinshelwood), the fitting results demonstrated that the best prediction of reforming rates can provided by Langmuir-Hinshelwood model for the reaction temperatures between 650 and 800 °C. Moreover, activation energies of methane and carbon dioxide consumption were −117 and −47 kJ/mol, indicating that much higher energy barrier is needed for methane activation compared to carbon dioxide.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Xue Zhao,Gang Wu,Wenpeng Zhang,Mengqiu Dong,Yu Xia
Sphingomyelins (SMs) are an essential class of lipids widely existing in different organisms. The sphingoid base and N-acyl chain are two building blocks which can undergo different types of modifications during lipogenesis, including desaturation, hydroxylation, and methyl branching. Current lipidomic analysis methods cannot provide detailed information on these structural motifs. Herein, we developed a tandem mass spectrometric method by harnessing radical-directed dissociation (RDD) from collision-induced dissociation (CID) of the bicarbonate anion adduct of SM ([M + HCO3]−). A major RDD channel produced a high-abundance fragment carrying the intact N-acyl chain, termed as “N-acyl fragment”, allowing the assignment of the sphingoid base/N-acyl composition and relative quantitation of compositional isomers of SM at high sensitivity. RDD also produced intrachain fragments in lower abundances, which helped localization of methyl branching and hydroxylation in SM. The acetone Paternò–Büchi (PB) reaction was found to be capable of derivatizing the Δ4 carbon–carbon double bond (C═C) in sphingosine (SPH) base and producing C═C diagnostic ions upon CID, albeit at much lower efficiencies than those of the isolated C═C in alkyl chains. A liquid chromatography–mass spectrometry workflow was developed by incorporating MS2 CID of SM via [M + HCO3]− and PB-MS2 CID. The capability of profiling SM with detailed structural information was demonstrated by analyzing complex lipid extracts from porcine brain and Caenorhabditis elegans. These results provided visualization of the sphingoid base/N-acyl compositional isomers of SM lipids and revealed large structural diversity from each sample. These included identification of the sphingadiene base [d18:1(Δ4,14)], C═C location isomers in N-acyls, C-2 hydroxylation of N-acyls, and iso-methyl branched SPH base.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Zhi Xu,Le Li,Xiaoxia Chen,Guyu Xiao
The fabrication of high-performance metal-free carbon catalysts for the oxygen reduction reaction (ORR) is of practical importance for the energy sector. A novel fabrication strategy was used to prepare high-performance N,S-codoped mesoporous carbons (NSMPCs) as ORR catalysts, involving the preparation of poly(3-aminothiophenol)-based assemblies followed by subsequent pyrolysis. The N and S heteroatoms of the poly(3-aminothiophenol) are incorporated into the NSMPCs by pyrolysis, forming abundant catalytic active sites. The mesopores of NSMPCs locate on their surface, which are derived from the degradation of the micelle templates. These shallow mesopores greatly enhance the specific surface area and promote the mass transfer for the ORR. Moreover, the embedded graphene (or carbon nanotube) in the NSMPCs facilitates electron transport during the ORR. These factors are synergistically modulated to boost the catalytic performances of NSMPCs. As a result, NSMPCs exhibit superb catalytic performances, close to or better than those of the best performing metal-free carbon ORR catalysts reported to date and commercial Pt/C in alkaline electrolyte. This synergistic strategy provides a facile pathway for the fabrication of advanced metal-free carbon ORR catalysts.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 56
·33635-33641
·
IF 3.119
Meihua Lin,Xin Ma,Shijun Lin,Xiaojin Zhang,Yu Dai,Fan Xia
Carbon dots (CDs) as fluorescent probes have been widely exploited to detect biomarkers, however, tedious surface modification of CDs is generally required to achieve a relatively good detection ability. Here, we synthesized N-doped carbon dots (N-CDs) from triethylenetetramine (TETA) and m-phenylenediamine (m-PD) using a one-step hydrothermal method. When the pH increases from 3 to 11, the fluorescence intensity of the N-CDs gradually decreases. Furthermore, it displays a linear response to the physiological pH range of 5–8. Au3+ is reduced by amino groups on the surface of N-CDs to generate gold nanoparticles (AuNPs), causing fluorescence quenching of the N-CDs. If glutathione (GSH) is then added, the fluorescence of the N-CDs is recovered. The fluorescence intensity of the N-CDs is linearly correlated with the GSH concentration in the range of 50–400 μM with a limit of detection (LOD) of 7.83 μM. The fluorescence probe was used to distinguish cancer cells from normal cells using pH and to evaluate intracellular GSH. This work expands the application of CDs in multicomponent detection and provides a facile fluorescent probe for the detection of intracellular pH and GSH.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Particuology
·
2020
·
IF 2.787
Zhou Lan,Yangcheng Lu
In this work, we used the inert substances silicone oil and n -hexane to modulate the solvent environment, and in so doing tailor the preparation of magnesium ethoxide (Mg(OEt) 2 ) particles. We found the following: (1) nonpolar n -hexane mainly modulates the polarity of the solvent to control the precipitation rate and size of the Mg(OEt) 2 seeds, thereby triggering accelerated nucleation to form small primary particles; and (2) silicone oil (relatively high polarity and viscosity) facilitates the growth and agglomeration stage, to improve inter-particle dispersion and obtain relatively uniform Mg(OEt) 2 particles. We summarized these findings in a common mechanism for preparing Mg(OEt) 2 particles with uniform morphology, small size, and high bulk density as per the synergistic effect of n -hexane and silicone oil. The ratios of silicone oil and n -hexane are flexible, and afford various regular and well-dispersed Mg(OEt) 2 particles that are 5–30 μm in size and 0.2–0.7 g/cm 3 in bulk density. The nanoparticles thus have the potential to serve in diverse applications such as catalysis.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Run Huang,Yanfei Li,Wenbin Liu,Yonghai Song,Li Wang
N-doped honeycomb-like carbon networks (N–HCN) loaded with ultra-fine Fe 2 O 3 nanoparticles (Fe 2 O 3 /N–HCN) are proposed as anode materials for lithium-ion batteries (LIBs). The Fe 2 O 3 /N–HCN nanocomposites are prepared by freeze-drying of glucose-Fe(NO 3 ) 3 solution, following by grinding it with urea, and finally annealing treatment. The N–HCN with dozen micrometer-sized macropores is composed of carbon nanosheets with a thickness of about 33 nm. A large number of 2–7 nm-sized ultra-fine Fe 2 O 3 nanoparticles with an average size of 4.4 nm are uniformly arrayed on the wall of N–HCN. The Fe 2 O 3 /N–HCN nanocomposites exhibit good performances as anode materials for LIBs. After 500 cycles under a large current density of 5 A g −1 , the Fe 2 O 3 /N–HCN nanocomposites still show a reversible capacity of 408 mAh g −1 . The good performance can be ascribed to the uniformly dispersed ultra-fine Fe 2 O 3 nanoparticles and unique honeycomb-like structure of N–HCN which provides a continuous conductive network to greatly promote the rapid transfer of ions and electrons, and effectively alleviate the volume fluctuation effect of Fe 2 O 3 during charging and discharging. More importantly, the cheap and environmentally friendly glucose as raw materials provides possibility for green energy applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·4083-4090
·
IF 11.301
Jin Liu,Xingcai Zhang,Qian Zhong,Jun Li,Hongzhang Wu,Bo Zhang,Lin Jin,Hua Bing Tao,Bin Liu
Semiconductor p–n junction engineering plays an indispensable role in developing highly efficient photocatalysts for energy conversion and environmental remediation. Herein, a novel AgI/Bi2Ga4O9 p–n junction photocatalyst is successfully constructed by an electrostatic self-assembly approach. Photoelectrochemical characterization together with density functional theory calculations shows that the formation of a p–n junction at the AgI/Bi2Ga4O9 interface favors separation and transfer of photogenerated charge carriers. The ˙O2− generated by 25%-AgI/Bi2Ga4O9 reaches a concentration of 18.8 μmol L−1 after 60 min of irradiation, which is 3.3 and 12.5 times higher than that generated by AgI and Bi2Ga4O9, providing 25%-AgI/Bi2Ga4O9 with greatly enhanced photocatalytic activity toward Acid Red 1 and metronidazole degradation. Our work provides a novel strategy for designing highly efficient photocatalysts for a wide range of energy and environmental applications.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）