JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Meiyu Yuan,Changxin Peng,Junjie Fu,Xuening Liu,Zihan Wang,Shiyu Xu,Sheng Cui
Accurate and convenient detection of nitrogen dioxide (NO 2 ) in the air, which is harmful to human health, is vital. However, it is difficult for many NO 2 detection devices to achieve high sensitivity at room temperature. In this work, we synthesized zeolite-imidazolate-frameworks-8 (ZIF-8) nanoparticles and zinc oxide/reduced graphene oxide (ZnO/rGO) aerogel by low-temperature synthesis and sol-gel method. The aerogel composite materials were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM), Brunaue-Emmette-Teller (BET), and Raman spectroscopy . The gas-sensitive element prepared by the material with the mass ratio ZIF-8 to rGO is 5:1 possesses excellent selectivity and higher sensitivity (3.21) to 100 ppm NO 2 at room temperature. Reduced graphene oxide (rGO) provides more gas transmission and diffusion channels for improving sensitivity because of a three-dimensional porous structure. When NO 2 is exposed, electrons transfer into p-n heterostructure formed by rGO and ZnO composite to achieve the purpose of sense. In this study, the material preparation method is relatively simple and efficient, which is of profound significance to accurately detect the variation of NO 2 concentration in air at room temperature.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Lanlan Tian,Yuanlin Xie,Jing Lu,Tiefeng Liu,Qiang Hu,Yongneng Xiao,Xiaoquan Zhu,Xintai Su
Iron-nitride based materials are considered to be one of the most promising anode materials for Lithium-ion batteries (LIBs) due to their good electrical conductivity and high theoretical capacity. However, iron-based nitrides are easily deteriorated in the long-term lithiation/delithiation process, which reduces the electrochemical stability and limits their large-scale application. Here, we report a Fe 3 N or Fe 2 N reduced graphene oxide nanosheets (rGO) composite prepared through a facile annealing process under different atmosphere (NH 3 /Ar) from Fe 3 O 4 original material. The voids in cubic structure of Fe 3 N or Fe 2 N can be beneficial to buffer volume changes during lithiation/delithiation processes and provide active sites, and the rGO is helpful to improve electrical conductivity of composites. Moreover, the proportion of Fe 3 N in the composite is higher than that of Fe 2 N, indicating that more cubic structure can be released in Fe 3 N/rGO. Therefore, Fe 3 N/rGO showed a higher capacity (513 mA h g −1 after 200 cycles at a current density of 0.5 A g −1 ), better rate performance and more stable cycling performance. This work provides a new direction for the construction of iron-based nitrides with different valence states as anode active materials for LIBs using Fe 3 O 4 as raw material.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Jiayi Wang,Shuhang Hu,Qi Tang,Jian Xu,Nianxi Xu,Shansheng Yu,Xiaoyi Wang,Hongwei Tian
Currently, to solve the problem of electromagnetic radiation, it is imperative to develop a thin, lightweight absorber, with a wide bandwidth and an excellent absorption ability. In this study, SiC and CoFe 2 O 4 were combined on reduced graphene oxide (rGO) with immobilized rGO and SiC nanoparticles and varying amounts of CoFe 2 O 4 nanoparticles . A facile one-pot hydrothermal technique was employed to prepare four rGO/SiC/CoFe 2 O 4 composite samples with varied CoFe 2 O 4 concentrations. The electromagnetic properties of rGO/SiC/CoFe 2 O 4 composites were affected by CoFe 2 O 4 content, and CoFe 2 O 4 content was varied to change the electromagnetic properties of composites. The rGO/SiC/CoFe 2 O 4 composite samples were prepared at a graphene oxide (GO) mass of 0.5 g, SiC mass of 0.25 g, and CoFe 2 O 4 mass of 1.5 g, and this composite sample exhibited the best microwave absorption consumption. At 60 wt% of rGO/SiC/CoFe 2 O 4 composite sample, the RL min at 7.4 GHz with a thickness of 2.43 mm was −62.39 dB, and efficient absorption of broadband (EAB) was 1.4 GHz (6.8–8.2 GHz). The EAB was 3.2 GHz (11.8–15 GHz), and the RL min was −59.77 dB at 13.2 GHz with a thickness of 1.39 mm. The RL min at 17.2 GHz was −65.49 dB, and the EAB was 2.3 GHz (15.7–18 GHz), despite a thickness of only 1.06 mm. The rGO/SiC/CoFe 2 O 4 composite comprised carbon materials, magnetic metals, and semiconductors. High-performance microwave absorption was achieved by the introduction of more than one loss mechanism and coordination and supplementation of multicomponent functions. The proposed carbon/semiconductor/magnetic composite material provides a feasible solution for the preparation of excellent microwave absorbing materials in the future.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 2
·857-867
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IF 3.591
Ziwen Wang,Baichuan Lu,Xiaokun Zhang,Shixiang Lu,Wenguo Xu
Herein, we have prepared a new nanocomposite Bi2S3/Co3O4/rGO/Ni foam substrate electrode through hydrothermal synthesis and an annealing process. SEM clearly shows that the Bi2S3/rGO/Ni foam substrate and Co3O4/rGO/Ni foam substrate prepared under the experimental conditions are cuboid-shaped and flower-shaped, respectively. However, the shape of Bi2S3/Co3O4/rGO/Ni foam is a perfect combination of the above two. We call this cuboid full of petals a flower-rod-like shape. The BET test found that the specific surface area of this unique morphology is as high as 152.7 cm2 g−1, which is beneficial towards charge transfer and improves the overall electrochemical reaction performance of the electrode. In addition, electrochemical performance tests displayed that the Bi2S3/Co3O4/rGO/Ni foam electrode had a high specific capacitance of 2214.3 F g−1 at 1 A g−1. The highest energy density of the Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitor is 133.4 W h kg−1 (the corresponding power density is 800.1 W kg−1), and the highest power density is 8568.2 W kg−1 (the corresponding energy density is 70.5 W h kg−1). Additionally, under the condition of 10 A g−1 current density, the capacitance retention rate is still extremely high: 99.4% after 10 000 continuous charge and discharge tests. In practical application, two Bi2S3/Co3O4/rGO/Ni foam//activated carbon asymmetric supercapacitors in series can make a 2.5 V bulb maintain a high brightness for 1 minute.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Hewei Zhao,Xiaolong Zeng,Tian Zheng,Shaojia Liu,Jie Yang,Rui Hao,Fengshi Li,Lin Guo
High capacity, ultra-fast charge/discharge rate, and long cycling life are external targets for Lithium-ion batteries (LIBs) to satisfy modern energy storage, but it is still challenging to realize them simultaneously. Here, we report a three-dimensional (3D) porous rGO@SnO 2 nanosheets aerogel (rGO@SnO 2 NSA) based on in-situ growing two-dimensional (2D) SnO 2 nanosheets on graphene oxide (GO@SnO 2 NS), subsequent controllable assembly and reduction. The 2D structure of SnO 2 can shorten the electron-transfer path, and the porous architecture of the 3D aerogel endows the aerogels with external ion-transfer channels and exceptional capacitive contribution. As a result, the LIBs using our 3D aerogels as anodes can endure ultrafast charge/discharge (10 A g −1 ) rate and exhibit ultra-long cycling life with a high energy density (512.1 mAh g −1 after 10,000 cycles). For application exploration, the LiFePO 4 /rGO@SnO 2 NSA cell also possesses excellent energy storage performance (364.5 mAh g −1 after 100 cycles). Our electrode design strategy of combining 2D active materials and 3D porous architecture provides a new path to develop next-generation rechargeable energy storage devices.
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高影响因子
PLASMA SCIENCE & TECHNOLOGY
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2021
·Vol. 23
·期 11
·115503
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IF 1.567
Xinghao LIU,Cheng CHENG,Zimu XU,Shuheng HU,Jie SHEN,Yan LAN,Paul K CHU
Tetracycline (TC) is an antibiotic mainly used in livestock production and respiratory infection. Traditional methods are not effective in removing TC from solution. In this study, TC was degraded by gas–liquid plasma in the presence of rGO-TiO2 in solution. The rGO-TiO2 was prepared by modified hummers and hydrothermal method. The electrical and optical properties of the gas–liquid discharge plasma were studied and the produced long-lived reactive species were analyzed by spectrophotometer. The degradation efficiency of TC was improved by 41.4% after plasma treatment for 12 min in presence of 30 mg l−1 rGO-TiO2 compared to that with plasma alone. The degradation efficiency increased with increasing discharge power, but as the initial concentration was increased from 20 to 80 mg l−1, the degradation efficiency of TC decreased. The initial pH had no significant effect on the degradation of TC. The intermediate products were determined by UV–vis spectrophotometry and ESI (+)–MS, and the degradation mechanism was analyzed. The reactive species, including O3, ·OH, and H2O2, etc., produced in the plasma/catalyst system attracted electron-rich functional groups (amino group, aromatic ring, and double bond). Therefore, the gas–liquid plasma/catalyst system could be an effective and promising method for pharmaceutical wastewater treatment in future.
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
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IF 4.098
Huixue Wang,Jinya Liu,Wei Chen,Jintong Na,Yong Huang,Guiyin Li
Glypican-3 (GPC3), a heparin sulfate proteoglycan, is a potential diagnostic and therapeutic target for hepatocellular carcinoma. In this paper, a novel fluorescent aptasensor for GPC3 detection is constructed via [email protected] quantum dots–labeled GPC3 aptamer ( [email protected] Apt ) as a fluorescence probe. First, [email protected] is screened out with higher fluorescence intensity, which emits bright blue fluorescence under ultraviolet light. Then, the fluorescence-labeled [email protected] Apt probe is formed by the combination of amination GPC3 Apt and [email protected] using EDC/NHS coupled reaction. Under hydrogen bond and π-π interaction/stacking, the fluorescence of [email protected] Apt could be quenched by reductive graphene oxide (RGO) with the help of the photoinduced electron transfer and the fluorescence resonance energy transfer mechanism. In the presence of GPC3, the [email protected] Apt specifically recognizes and binds to GPC3, giving rise to the change of secondary structure of GPC3 Apt to form the GPC3/GPC3 Apt [email protected] complex, which would lead to the disintegration of the [email protected] Apt -RGO compound. Therefore, the energy transfer process is blocked and the fluorescence intensity is restored, enabling a highly sensitive response to GPC3. When the concentration of GPC3 is from 5.0 ng/mL to 150.0 ng/mL, the fluorescence recovery rate is well linearly related to GPC3 concentration with the limit of detection of 2.395 ng/mL (S/N = 3). This strategy shows recoveries from 98.31% to 101.89% in human serum samples and provides simple, fast and cheap analysis of GPC3, which suggests that it has great potential applications in clinical diagnosis for hepatocellular carcinoma.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Niandu Wu,Wenhua Zhao,Boye Zhou,Yizhang Wu,Wentao Hou,Wei Xu,Jun Du,Wei Zhong
Ti 3 C 2 T x (MXene) has intriguing application potential for supercapacitors. However, it usually suffers from self-accumulate and restack, resulting in the decrease of electrochemical active sites and low capacitance. Here, we demonstrated a 3D nitrogen-doped Ti 3 C 2 T x /rGO (NTG) foam which was synthesized through the multistep of gelation assisted with urea, freeze-drying, and thermal treatment processes. The decomposition of urea can not only change the morphology, bringing out more open marco- and microporous structures, but also improve the conductivity due to the nitrogen doping in the matrix. The 3D porous architecture can expose more electrochemical active sites, and thus accelerate the transport/diffusion of electrolyte ions. Consequently, the NTG foam possesses a high specific capacitance of 463 F g −1 , good rate performance, and outstanding cycling stability (90.8% retention after 10 000 cycles) in H 2 SO 4 electrolyte, showing enhanced performance of supercapacitors in comparison with pure Ti 3 C 2 T x and Ti 3 C 2 T x /rGO electrode.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 47
·26999-27009
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IF 12.732
Kexia Jin,Jianxiong Xing,Xinge Liu,Zehui Jiang,Shumin Yang,Xuan Yang,Jianfeng Ma
To achieve high mechanical strength electromagnetic interference (EMI) shielding materials for practical application, cellulose nanocrystals (CNC), as a reinforcing and dispersing agent, are intercalated into reduced graphene oxide (RGO) layers, forming an ultrathin, robust, flexible, and hydrophobic CNC/RGO film with a highly ordered nacre-like layered structure via a self-assembly process. The layered structure significantly shortens the reduction time and improves the mechanical strength and shielding effectiveness (SE) of the resultant CNC/RGO composite film. The controlled preparation of CNC with different aspect ratios is realized by using separated bamboo fiber and parenchyma. The CNC of the fiber with a higher aspect ratio and lower diameter results in a lower porosity, denser structure, and more uniform distribution in the composites, and therefore a higher electrical conductivity and SE. The highest SE (39.1 dB) and specific SE (11 367 dB cm2 g−1) with a high tensile strength (179 MPa) and water contact angle (106°) of the CNC/RGO film are obtained at 10 wt% CNC loading with a film thickness of 12 μm. The maximum tensile strength of the composite film reaches 227 MPa with 30–50% CNC. The ultrathin high-performance CNC/RGO film shows significant potential as an EMI shielding material in the aerospace and flexible electronics fields.
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高影响因子
Sustainable Materials and Technologies
·
2021
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IF 7.053
Zhifan Zhao,Xiaojing Teng,Qinqin Xiong,Hongzhong Chi,Yongjun Yuan,Haiying Qin,Zhenguo Ji
FeSe 2 @reduced graphene oxide (rGO) composite was prepared by a facile one-step hydrothermal technique with FeSe 2 nanoparticles uniformly achored on rGO nanosheets . The nano-sized FeSe 2 particles effectively reduce the transfer length of Li ion and increase the sufficient contact area between the electrolyte and active material. Moreover, rGO can not only improve the electrical conductivity , but also prevent the agglomeration of nano-sized FeSe 2 , as well as accommodate the volume expansion and strain generated from the charge/discharge process. As an anode material applied in Li-ion storage, FeSe 2 /rGO composite delivers superior specific capacity of 1167.6 mAh/g, good cycling stability (908.2 mAh g −1 after 120 cycles at the current density of 500 mA g −1 ) and high-power characteristics (728.0 mAh g −1 at 1000 mA g −1 ), due to coexistent Li-ion storage mechanisms of surface capacitive behavior and diffusion-controlled process.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Ying Chen,Hongmei Liu,Xiuting Li,Shiwei Tang,Chenjie Gu,Guodong Wei,Tao Jiang,Xingfei Zhou
Molybdenum disulfide (MoS 2 ) with promising photocatalytic activity has attracted great attention in constructing recyclable SERS substrate. Reduced graphene oxide (RGO) was chose here to in-situ grow MoS 2 nanoflowers and effectively adjust the active area of the substrate. After the decoration of Ag nanoparticles by photo-reduction, a sophisticated RGO@MoS 2 @Ag ternary nanocomposite with a maximizing SERS enhancement factor (EF) of 8.6 × 10 6 and a prominent solar photocatalytic efficiency was demonstrated. Such superior features of the nanocomposite were revealed to be endowed by the synergistic effect of the three components including the active sites of MoS 2 , the “Schottky barrier” and “hot spots” between MoS 2 and Ag, together with the molecular enrichment surface and chemical enhancement ability of RGO . An ultra-sensitive SERS-based detection and a reliable photocatalytic degradation of mixed trace molecules were finally achieved by the developed optimal ternary nanocomposite, which can meet manifold requirements for the routine supervision of biochemical molecules.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lizhu Chen,Xueting Xie,Xianliang Song,Shucan Luo,Shengying Ye,Wenbei Situ
To maintain the quality of harvested fruits and vegetables in a closed refrigerated environment, a novel nanocomposite photocatalyst MIL101(Fe)-TiO 2 -rGO (MTR) for ethylene degradation was synthesized. The characterization of MTR was analyzed by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS) and High-resolution transmission electron microscope (HRTEM). Moreover, with the good conductivity of rGO, MTR had the smallest band gaps according to ultraviolet–visible solid diffuse reflection (UV–Vis DRS) analysis; this small band gap size improved the utilization of light. According to the results of the photoluminescence spectra and electrochemical impedance spectra, the charge transfer resistance and transient photocurrent of MTR were improved. The redox process of Ti 4+ /Ti 3+ from TiO 2 and Fe 3+ /Fe 2+ from MIL101(Fe) efficiently prevented the recombination of e - -h + pairs. In this cycle, oxidative active substances ( • O 2 − ) were provided, which played a key role in the ethylene degradation of MTR. Additionally, MTR has excellent gas adsorption capacity, and the photocatalytic degradation rate of C 2 H 4 by MTR was 2.07 × 10 -4 min −1 , which is better than that of other photocatalysts. Furthermore, the photocatalytic activity of MTR was still stable after 4 times of recycling, indicating the potential to maintain the quality of horticultural products after harvesting.
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高影响因子
危险品化学品经营许可证（带存储）