APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Chong Wan,Yushu Xiong,Honghong Qin,Zhao Qin,Suhang Chen,Kangzhen Xu
Nanothermites are presenting competitive advantage potential in military and civilian applications, but high electrostatic discharge (ESD) sensitivity severely hinders their preparation, storage and usage. Aiming to improve the safety and combustion properties of energetic materials (EMs), the two-dimensional semiconductor materials graphite carbon nitride (g-C 3 N 4 also abbreviated as CN) was inserted into the Al/CuO mixture via the one-step sol-freeze-drying method. The successful preparation of samples was confirmed by morphological and chemical bond characterization. Then DFT calculation and BET tests prove that more active sites exist in reaction interface, and the adsorption between Al atoms and CuO unit cells are easier due to polyvinylpyrrolidone (PVP) and g-C 3 N 4 functioning, thereby improving the combustion of Al/CuO and ESD safety. The Al/CuO/CN nanocomposite with 2.5 wt% CN has an ESD ignition threshold of 3.2 mJ and realizes maximal reaction energy and constant volume heat of combustion ( Q v ) of 1400.4 J·g −1 and 5896 J·g −1 , respectively. As the CN content grows to 10.0 wt%, the ESD ignition threshold keeps decreasing to 8.45 mJ. Additionally, PVP and CN show superior advantages in regulating the combustion of Al/CuO, and the possible effect mechanism is investigated. This work will provide a fresh strategy for extending applications of nanothermites.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Haohuan Yuan,Wenting Xiao,Xin Zhang,Jiao Bao,Wei Li,Bo Huang,Guannan He
Efficient carrier separation and high electron migration efficiency are essential for sustainable H 2 energy production via photocatalysis . In this work, a Mn 0.5 Cd 0.5 S/Ti 3 C 2 MXene/g-C 3 N 4 all-solid-state Z-scheme photocatalyst is constructed by a series of processes, including low temperature calcination , etching, ultrasonication and solvothermal process. The appropriate energy band structures of g-C 3 N 4 and Mn 0.5 Cd 0.5 S enable the formation of the Z-scheme system, achieving efficient carrier separation. The Ti 3 C 2 MXene flakes assembled between g-C 3 N 4 nanosheets and Mn 0.5 Cd 0.5 S particles can accelerate the charge migration rate in the system. The optimized ternary composite exhibits the highest hydrogen evolution rate (HER) of 13.7 mmol g −1 h −1 , which is much higher than that of the pure g-C 3 N 4 and Mn 0.5 Cd 0.5 S. Meanwhile, the apparent quantum yield (AQY) value of the composite at 420 nm reaches up to 24.07 % and exhibits high stability. Based on the characterization, the photocatalytic mechanism of carrier transfer in the Z-scheme heterojunction is also revealed. The finding of this article provides insights into the high efficiency of carrier transfer and separation in the photocatalytic reactions.
研究领域:
材料科学
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能源化学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Qi Zhang,Zhen Zhang,Wanli Xia,Yaming Zhou,Hongmin Yang
Lauric acid (LA) shows much potential as one organic phase change material (PCM) for thermal energy storage, owing to its suitable melting point, relatively high thermal/chemical stability and latent heat. However, the LA-based thermal storage method invariably suffers from the big challenges of liquid leakage tendency and low thermal conductivity of single lauric acid, limiting immensely its practicality. Herein, one encapsulation and modifying strategy to fabricate high conductive and low liquid leakage composite phase change materials (CPCMs) for photo-thermal storage was proposed by constructing novel graphene doped LA/g-C 3 N 4 CPCM. Firstly, LA is infiltrated into a novel two-dimensional porous matrix – the graphitic phase carbon nitride (g-C 3 N 4 ) to prevent liquid leakage in the solid–liquid phase change process. Then it is further incorporated with a certain amount of graphite nanoplatelets to further enhance thermal conductivity. The encapsulation and modifying strategy enable the graphene doped LA/g-C 3 N 4 to show excellent thermal storage performance for both heat and light energy, low liquid leakage, and high thermal stability. The hybrid LA/g-C 3 N 4 with 5 wt% graphene (CPCM3) modification has a melting temperature of 45.88 °C and enthalpy of 159.19 J/g. The corresponding solidification temperature and enthalpy are 43.36 °C and 144.40 J/g, respectively. Its thermal conductivity at 50 °C is enhanced to 0.9338 W/(m·K) (one time higher than single LA), also superior to the state-of-the-art LA-based CPCMs. After 100 thermal cycles, the composite phase change material only suffers low mass loss and latent heat loss of phase change, which proves the good thermal reliability. Furthermore, TGA and DTG data indicate that CPCM3 can maintain good thermal stability in the normal operating temperature range. In the whole, the joint effect of the porous g-C 3 N 4 matrix and graphene modification improve the thermal storage performance of LA through the improvement of liquid immobilization and thermal conductivity. This work provides a promising strategy for fabricating high conductive and low liquid-leakage CPCM toward enhanced photo-thermal storage.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE FORUM
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2020
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IF 0
Yu Quan Ren,Shi Yong Sun,Edward Opong Acheampong,Fa Qin Dong,Biao Biao Ma,Ke Wang,Xiao Yu Fan
A one-step synthesis of visible light responsive diatomite/g-C3N4 composite material was prepared by impregnation-calcination method. The products were characterized by Scanning electron microscope, X-ray diffractometer, Ultraviolet diffuse reflectance spectroscopy, Fourier transform infrared spectrometer, and Photoluminescence spectrometer. The SEM results showed that g-C3N4 was successfully attached onto the surface of the diatomite. Also the composite materials were more light-responsive compared with the single phase material. The composite materials had a maximum degradation efficiency up to nearly 91.79%. The significant improvement in photocatalytic performance was due to the porous structure of diatomite, increase of contact area of carbon nitride.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
ANALYTICAL CHEMISTRY
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2014
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IF 5.825
Chenchen Ge,Quan Luo,Dou Wang,Shiming Zhao,Xiaoling Liang,Luxin Yu,Xuerong Xing,Lingwen Zeng
G-quadruplex-forming sequence can be formed through a copper(I) ion (Cu+)-catalyzed click chemistry between azide- and alkyne-modified short G-rich sequences in aqueous solution, eliminating immobilization and washing steps of conventional assays. The source for Cu+ was generated from the reduction of Cu2+ with the reductant of sodium ascorbate. In the presence of hemin and K+, the self-assembly of hemin/G-quadruplex structure has the activity of horseradish peroxidase (HRP), which can catalyze its colorless substrate tetrazmethyl benzidine (TMB) into a colored product. Hence, the concentration of Cu2+ can be evaluated visually for qualitative analysis according to the color change of the solution, and the optical density (OD) value of the resulting solution at 450 nm was also recorded using a microplate reader for quantitative analysis.
研究领域:
生物化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 9
·e202304054
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IF 1.9
Caihong Xue,Xianlan Wang,Guijun Yang,Hao Yang,Hui Nan,Guocai Ma,Shiai Xu
Graphical A larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) are successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and ionic conductivity of separator can be improved through the carboxylated HCN. The LFP || Li half-cell of the separator has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) is a standard electrolyte membrane and binder material for lithium-ion batteries (LIBs) because of the benefits of membrane formation and strong mechanical properties. Still, its use is limited due to unavoidable defects such as high crystallinity and poor electrochemical performance. In this paper, a larger specific surface area and three-dimensional (3D) permeable lamellae carboxylated g-C 3 N 4 (HCN) were successfully prepared by HNO 3 and introduced into the PVDF-HFP to obtain a high-performance composite separator. The wettability and electrolyte absorption of PVDF-HFP separator can be improved through the carboxylated HCN. More crucially, because PVDF-HFP has several active sites and low crystallinity, adding HCN can greatly increase the ionic conductivity of separators. The ionic conductivity of PH-HCN at 25 °C is 0.52 S cm −1 , 4.7 times higher than the initial PVDF-HFP membrane, and the oxidation potential can reach 4.8 V. The assembled lithium-ion batteries half-cell has a capacity of 71 % at a 5 C rate and 94 % after 400 cycles at a 2 C rate. Therefore, the improved separator has the potential to be applied to high-performance LIBs.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
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2021
·
IF 5.467
Chaoning Huang,Shizheng Zhang,Mengfan Wang,Hongliang Xu,Mingliang Li,Bo Song,Gang Shao,Hailong Wang,Hongxia Lu,Rui Zhang
Melem/g-C 3 N 4 /vermiculite hybrid photocatalyst (CNV-X) with a sandwich structure for degrading tetracycline was constructed by hydrothermally treating the pre-synthesized g-C 3 N 4 /vermiculite composite (CNV). With the enhancement of hydrothermal temperature, part of g-C 3 N 4 was gradually transformed into thorn-ball-like melem, the specific surface area of the samples increased step by step from 9.88 m 2 /g for CNV to 33.93 m 2 /g for the sample hydrothermally treated at 180 °C (CNV-180). Then, the specific surface area of CNV-X dramatically decreased to 6.36 m 2 /g when hydrothermally treated at 200 °C. The variation trend of photocatalytic performance of CNV-X samples with the hydrothermal temperature was similar to that of specific surface area. CNV-180 exhibited the optimum photocatalytic performance, it (0.05 g) degraded 81.82% of tetracycline molecules (100 ml, 20 mg/L) after photocatalysis for 120 min, and the reaction rate constant (0.0137 min −1 ) was 2.74× that of pure g-C 3 N 4 . CNV-180 exhibited excellent stability and reusability which degraded 77.68% of tetracycline molecules after five 120-min cycles. The degradation rate of the melem/g-C 3 N 4 /vermiculite composite with respect to tetracycline was 77.68% after five 120-min cycles. The significant improved photocatalytic activity was due to the enhanced specific surface area, the enhanced optical absorption property , prohibited recombination, and accelerated separation and transfer efficiency of photo-generated electron-hole pairs, which can be ascribed to the sandwich structure, the heterojunction of g-C 3 N 4 /melem, and the electrostatic repulsion between photo-generated electrons and the permanent negative charges of the vermiculite layers. Moreover, the band structure, the main active substance (·O 2 − ), and a photocatalytic mechanism were proposed. Thus, this study provided a promising approach to photo-degradation of tetracycline and potential applications to vermiculite-based photocatalytic materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2018
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IF 2.829
Shiyu Zuo,Haiming Xu,Wei Liao,Xiangjuan Yuan,Lei Sun,Qiang Li,Jie Zan,Dongya Li,Dongsheng Xia
A novel heterojunction composite photocatalyst, g-C 3 N 4 -Cu 2 O, was fabricated via a high-temperature solid-phase molten salt method, hydrothermal method, and high-temperature calcination method. The structures and properties of as-synthesized samples were characterized using a range of techniques, such as X-ray photoelectron spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectra and the Brunauer Emmet Teller (BET) theory. Their photocatalytic activity was evaluated based on the degradation of methyl orange (MO) under visible light irradiation. Based on the results obtained via TEM, XPS, EPR, and the other techniques, we verified that a heterojunction had formed. The g-C 3 N 4 -Cu 2 O heterojunction had the largest specific surface area, which provided plentiful activated sites for photocatalytic reaction. Moreover, g-C 3 N 4 -Cu 2 O showed the highest photocurrent effect and the minimum charge-transfer resistance. Furthermore, the g-C 3 N 4 -Cu 2 O heterojunction exhibited the highest MO photodegradation rate. After a series of radical trapping experiments and EPR analysis, we demonstrated that the holes and O 2 − radicals could be the main active species involved in MO photodegradation. The molten-salt process can improve the BET surface area to form abundant heterojunction interfaces, which serve as channels for photogenerated carrier separation and thereby enhance its light utilization and quantum efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yanhong Li,Qifeng Zhang,Yi Lu,Zhiting Song,Changjiang Wang,Dongshuo Li,Xiao Tang,Xianju Zhou
The photocatalytic degradation of tetracycline in aqueous solution is a typical heterogeneous reaction, and thus the design of efficient photocatalysts for tetracycline degradation should revolve the process features of heterogeneous reaction closely. In the present work, TiO 2 -P/ g -C 3 N 4 composites with abundant surface hydroxyls were prepared by coupled g -C 3 N 4 nanosheets with plasma treated TiO 2 (TiO 2 -P) nanoparticles . The resultant TiO 2 -P/ g -C 3 N 4 as photocatalysts showed higher activity for the degradation of tetracycline in aqueous solution than g -C 3 N 4 , TiO 2 , TiO 2 -P and TiO 2 / g -C 3 N 4 under visible light irradiation. The better activity of TiO 2 -P/ g -C 3 N 4 photocatalysts for tetracycline degradation could be ascribed to the good synergy between TiO 2 -P and g -C 3 N 4 . Specifically, due to the presence of surface hydroxyls on TiO 2 -P, the tetracycline adsorption activity, electrons-holes separation property as well as H 2 O 2 activating activity of TiO 2 -P/ g -C 3 N 4 during tetracycline degradation were improved. By integrating the property of g-C 3 N 4 photocatalyst in H 2 O 2 production, as well as the property of TiO 2 -P in activating H 2 O 2 into •OH and •O 2 - , efficient photo-Fenton degradation of tetracycline was achieved in the TiO 2 -P/ g -C 3 N 4 photocatalytic system. Our study on TiO 2 / g -C 3 N 4 composite photocatalyst provides helpful inspiration to design photocatalysts with high-activity for the photo-Fenton degradation of organic pollutants .
研究领域:
环境催化
·
材料化学
·
环境污染治理
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光化学
·
纳米材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2014
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IF 2.538
Si-Zhan Wu,Kui Li,Wei-De Zhang
Heterostructured photocatalysts Ag 3 VO 4 /g-C 3 N 4 were prepared by deposition-precipitation method in order to anchor Ag 3 VO 4 on the surface of N-vacancy g-C 3 N 4 (g-C 3 N 4 -VN). The photocatalytic activity of the samples was evaluated by degrading rhodamine B (RhB) in aqueous solution. Compared with the pure Ag 3 VO 4 and g-C 3 N 4 -VN, the heterojuncted photocatalyst 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN exhibits the best activity under visible light irradiation. The photodegradation rate constant of 65 wt% Ag 3 VO 4 /g-C 3 N 4 -VN is 0.0556 min −1 , which is 23.4, 5.8 and 6.4 times of that of pure Ag 3 VO 4 , pure g-C 3 N 4 -VN and P25, respectively. The excellent photocatalytic performance of the Ag 3 VO 4 /g-C 3 N 4 -VN catalysts can be ascribed to the matched band structures of Ag 3 VO 4 and g-C 3 N 4 , which strengthened the formation of the heterojuncted photocatalyst. The unique heterostructured photocatalyst is favorable for retarding the recombination of photogenerated electrons and holes, thus the photocatalytic activity is significantly increased. Further experiment also reveals that the •O 2 − and h + are the major active species in the degradation of RhB.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xin Jiang,Han Jiang,Yimin Tang,Rui Wang,Wenxue Wang,Libin Yang,Bing Zhao
Semiconductor heterojunction with functional integration can be used as an excellent matrix for the ultrasensitive detection of bisphenol A (BPA) with low molecular affinity. Here, a simple, low-cost and sensitive surface-enhanced Raman scattering (SERS) strategy using g-C 3 N 4 /TiO 2 heterojunction as substrate was presented for detection of BPA residues in foods. The g-C 3 N 4 /TiO 2 achieved specific chemisorption for target analyte by the formation of intermolecular H-bond between g-C 3 N 4 and BPA. And, a high-efficiency carrier separation in TiO 2 induced by heterostructure could be achieved for charge transfer between the substrate and molecule by a “donor-bridge-acceptor” charge-transfer mode. Due to the synergistic/collaborative contributions of two monomers in heterojunction, the SERS enhancement factor was as high as 3.77 × 10 7 . The detection limit of BPA residues in foods (milk, juice and drinking water) was as low as 10 −9 mol·L −1 , far below the EU standard. The developed substrate also exhibited excellent stability and anti-interference capability.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2024
·
IF 9.6
Wang Wei-Wei,Huang Rui,Tao Yu,He Peng,Tuo Su-Xing,Bian Yu-Jian,Hu Rui-Ting,Yan Jun,Liang Yan-Jie,Zhang Wen-Chao
The electrochemical utilization of Zn anodes in aqueous batteries is hampered by the intricate and interconnected issues of Zn dendrite growth, H 2 evolution and Zn corrosion reactions. In this study, a multifunctional protective layer comprising MXene and graphitic carbon nitride (g-C 3 N 4 ) was constructed using a self-assembly strategy. The MXene/g-C 3 N 4 protective layer exhibited robust zincophilic characteristics, which facilitated a uniform distribution of the electric field and ensured a sufficient influx of Zn 2+ . This reduces the Zn 2+ nucleation barrier and prevents dendrite growth. In addition, the hydrophobic nature of the protective layer, coupled with its negative charge, can repel SO 4 2− and select water molecules from the electrolyte, which aids in mitigating corrosion and H 2 evolution. The symmetric Zn cell coated with the MXene/g-C 3 N 4 protective layer showed remarkable stability, achieving over 2000 h of reversible cycling at 1 mA·cm −2 . Furthermore, the MXene/g-C 3 N 4 -coated Zn anode paired with a sodium-doped V 2 O 5 cathode (NVO) exhibited enhanced cycling capability over 1500 cycles. Graphical Abstract
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）