JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Yunyun Ding,Panpan Li,Jiashuang Wang,Xian Li,Yun Liu,Hongcun Bai,Hui Zhang
Si has become the most promising anode materials for lithium-ion batteries (LIBs) due to its high theoretical specific capacity and comparable low discharge potential. However, the practical usage of Si is still hindered by its huge volume expansion. To release volume stress and improve conductance, designed self-supporting binder-free Si electrode endowed with three-dimensional structure has been come up in this research. The pore structure is adjusted by rationally designing the proportion of carbon nanotubes (CNTs) and carbon nanofibers (CNFs) to alleviate volume change. Simultaneously, construct stable conductivity network was fabricated via ice crystal self-assemble freezing technique following compress and carbonization process. The electrochemical specific capacity of rGO@CNTs@CNFs@Si-2 electrode has stably remained at 2250 mAh/g after 100 cycles (100 mA/g) with benign rate capabilities. This simple self-assemble method for self-supporting binder-free Si electrode would open a new route to exploit high energy density Si-based electrode for flexible LIBs.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 10
·5279-5287
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IF 11.9
Yange Yu,Wenzhu Shao,Yue Liu,Yang Li,Jing Zhong,Huijian Ye,Liang Zhen
Superior energy storage performance of PVDF-based nanocomposites such as discharged energy density or efficiency is reported, leading to a lower volume, lightweight system, or high reliability for film capacitors. However, researchers often ignore exploring practical ways to simultaneously enhance the discharged energy density (Ue) and energy storage efficiency (η) as well as the physical mechanism that determines the energy storage performance. Herein, the charge transfer path in the PVDF matrix with core–shell nanoparticles under 150 MV m−1 was first analyzed by finite element simulation. Under the guidance of theoretical simulation, core–shell structured BaTiO3 (BTO)@reduced graphene oxide (rGO) nanoparticles (NPs) were introduced into the PVDF matrix, in which rGO played the trapping role. The introduction of rGO reduces the possibility of local electric field failure of composite materials, optimizing the charge transfer path and improving both Ue and η, which are superior to the data in the literature. An effective strategy for creating high-energy storage polymer nanocomposites is presented in this study.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
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IF 3.806
Jixian Ma,Binxia Zhao,Xiaoxiao Fan,Wenjie Wang,Xingliang Chen,Nan Shao,Peiyang Jiang
An efficient Ag/rGO/Bi 2 WO 6 nanocomposite was synthesized by the precipitation-photoreduction method. The resulting Ag/rGO/Bi 2 WO 6 showed excellent photocatalytic activity for the photodegradation of Rhodamine B (RhB), with 15%Ag/rGO/Bi 2 WO 6 photodegrading 96.97% of RhB in 180 min, which was 1.28, 1.09 and 1.05 times higher than that of Bi 2 WO 6 , Ag/rGO, and rGO/Bi 2 WO 6 , respectively. The effect of noble metal Ag's surface plasmon resonance and Schottky barrier , as well as the superior electron transfer ability of rGO , dramatically improved photo-generated electron-hole pair separation and transfer efficiency. In addition, the effects of pollutant concentration, pH, and catalyst dosage on Ag/rGO/Bi 2 WO 6 photocatalytic performance also were explored. Furthermore, the free-radical trapping tests revealed that the primary active radicals in the catalytic system are hole (h + ), superoxide radical (•O 2 − ), and hydroxy radical (•OH). Additionally, after four recycling, the photocatalytic performance of the Ag/rGO/Bi 2 WO 6 composite did not show a significant decline. As a result of this research, the Ag/rGO/Bi 2 WO 6 catalyst, as developed, has a bright potential for environmental purifying.
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高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ling Yang,Lei Sheng,Xingxu Gao,Xin Xie,Yaozong Bai,Gaojun Liu,Haoyu Dong,Tao Wang,Xianli Huang,Jianping He
Lithium metal batteries (LMBs) with ultra-high theoretical energy density are a prospective candidate to replace current lithium-ion batteries (LIBs). However, there are still two non-negligible problems of lithium dendrites and the volume expansion effect of LMBs. In this study, reduced graphene oxide (rGO)/Li-Al-LDH composite nanosheets were firstly prepared via a hydrothermal method and then vacuum filtered onto commercial polypropylene (PP) separator. This kind of rGO/Li-Al-LDH nanosheets layer is expected to improve the wettability of liquid electrolytes and thermal stability. Furthermore, rich- Li-Al LDH can promote more ionic carriers and channels, which exhibits higher-efficiency lithium-ion transport properties. Meanwhile, rGO with a graphitic-like structure is able to disperse the concentration of electrons at the sharp point when lithium dendrites arise. As a result, the discharge capacity of the Li||LiFePO 4 cells based on the rGO/Li-Al-LDH@PP separator is still 1.852 mAh after 250 cycles and the capacity decay rate is just 4.24%. It is demonstrated that a feasible and effective strategy for the modified separator can enhance the electrochemical performance of LMBs.
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高影响因子
CARBON
·
2022
·
IF 11.307
Fanbin Meng,Yao Chen,Weihua Liu,Likui Zhang,Wenting Deng,Zichao Zhao
It is of vital importance to eliminate the electromagnetic interference of various electronic devices in military and civil fields. However, many researches focus on electromagnetic shielding while ignoring the practical environmental suitability of materials. In this work, the Dimethyl octadecyl (3- trimethoxylsilyl propyl) ammonium chloride (DMAOP) chains were introduced into reduced oxide graphene sheets to achieve the composite films (RGOFs) with “brick-slurry” structure by simple room temperature chemical reaction combined with vacuum filtration technology. Ultimately, the RGOFs exhibited multifunctional features, including great electromagnetic shielding (EMI) performance (above 6.6 × 10 4 dBꞏcm −1 ), high strength and toughness properties (∼240 MPa, 6.28%), and excellent environmental adaptability. The formed dense “brick-slurry” structure is conductive to the construction of conductive path , contributing to the high EMI. Further, molecular dynamics simulation, in situ scanning and in situ Raman illustrated that the DMAOP molecular chain could strengthen the orientation, stress transfer, and delay the crack propagation by connecting graphene sheets , resulting high strength and toughness. Besides, the obtained films also exhibited excellent antibacterial properties , and acid, alkali environment adaptability due to their special components and interface design scheme. This work can provide ideas for developing effective preparation approaches of graphene-based membranes with excellent properties in the context of the requirements of a new generation of high-performance materials.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lanxin Hu,Aiyang Wang,Tian Tian,Chun Liu,Wenchao Guo,Qianglong He,Hao Wang,Jingjing Xie,Weimin Wang,Zhengyi Fu
In this study, B 4 C–SiC–rGO composites with different SiC contents were prepared by spark plasma sintering at 1800 °C for 5 min under a uniaxial pressure of 50 MPa. The effects of SiC on the microstructures and mechanical properties of the B 4 C–SiC–rGO composites were investigated. The optimal values for flexural strength (545.25 ± 23 MPa) and fracture toughness (5.72 ± 0.13 MPa·m 1/2 ) were obtained simultaneously when 15 wt.% SiC was added to 5 wt.%–GO reinforced B 4 C composites (BS15G5). It was found that SiC and rGO inhibited the grain growth of B 4 C and improved the mechanical properties of the B 4 C–SiC–rGO composites. The clear and narrow grain boundaries of rGO–B 4 C and rGO–SiC, as well as the semi-coherent B 4 C–SiC interface, indicated strong interface compatibility. The twin structures of SiC and B 4 C observed in the composites improved their fracture toughness. Crack deflection and crack bridging caused by the SiC grains as well as rGO bridging and rGO pull-out were observed on the crack propagation path.
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高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Chao Xue,Wanling Cai,Xiulan Weng,Gary Owens,Zuliang Chen
The use of biomass for the synthesis of value-added products, such as functional nanomaterial for the removal of contaminants, is a challenge. In this study, hybrid bimetallic Fe/Ni nanoparticles and reduced graphene supported bimetallic Fe/Ni nanoparticles (Fe/Ni-rGO) were prepared via a one-step green synthesis using green tea extract, and thereafter evaluated for the simultaneous removal of rifampicin (RIF) and Pb(II) from aqueous solution. The efficiencies of Pb(II) and RIF removal by Fe/Ni-rGO were 87.5 and 96.8%, respectively. The removal performance of the hybrid Fe/Ni-rGO was better than either n Fe/Ni, rGO, or Fe-rGO. Detailed characterization and analyses of Fe/Ni-rGO indicated that both Fe and Ni nanoparticles were evenly distributed over the surface of rGO and that aggregation of Fe, Ni nanoparticles, and stacking of rGO in the hybrid were decreased. Furthermore, while LC-TOF-MS analysis showed that RIF was degraded into small-molecule fragments, XPS showed that Pb(II) was not reduced to Pb 0 . The major conditions impacting removal efficiency, adsorption kinetics, and fit to adsorption isotherm models were examined to better understand the removal mechanism. While the adsorption of both contaminants fit well a pseudo-second-order kinetic model, the adsorption of RIF fit the Freundlich isotherm model best, while the adsorption of Pb(II) fit the Langmuir isotherm model best. Thus, the removal mechanism of both contaminants firstly being chemical adsorbed onto the surface, while n Fe/Ni continues to participate in the catalytic reduction of RIF. Moreover, Fe/Ni-rGO could be reused and performed well for wastewater treatment , thus suitable as a practical resource recycling technology .
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 7
·4439-4453
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IF 5.044
Zhang Shichen,Xu Jiangtao,Sun Yue
Pressure sensors were fabricated based on porous polymer films coated onto cotton fabric modified with reduced graphene oxide (rGO). The cotton fabric was modified with a silane coupling agent to improve the adhesion between the cotton fabric and rGO. The porous structure was constructed to enlarge the surface area of the coating polymer. The fabrication process was characterized with Fourier Transform Infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and Raman spectrometry. Owing to the materials and constructed porous structure, the prepared devices (1 × 2 cm 2 ) showed an excellent electric output with a voltage of 132 V and an outstanding linear relationship of applied forces and frequencies with values of adjusted R 2 over 0.97. In practical detection of human motion, the prepared pressure sensor gave clear signals for each step during the walking, jumping and running. Graphic abstract
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 11
·3170-3188
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IF 3.186
Zhang Qian,Zhou Yu-lian,Wang Bao-zong,Hong Jun-ming
The performance of electrocatalytic-oxidation process depends on the anode characteristics, so the preparation of active anode materials is an attractive method to enhance the efficiency of this process. However, the high catalytic properties of graphene and its derivatives have been well confirmed, an efficient method of controlling catalytic activity and stability remains to be established. In this research, the relationship between the precursor and catalytic performance was clarified by regulating the oxygen-containing groups in the precursor. Results indicated that the surface O groups on the precursor were sensitive to controlling the catalytic activity and stability of tri-doped reduced graphene oxide (RGO). With more O groups in the precursor (catalysts from graphene oxide), the doped heteroatom species is vulnerable involved into reaction, leading to the flaking of active sites, and ultimately decreasing the activity and stability performance. By contrast, the fewer O groups in the precursor (catalysts from RGO) created stable and active defects for oxidation activity. The interactions of O groups in the C precursor with those in the heteroatom precursor were further confirmed by DFT calculations. The findings of this research presented a new strategy for controlling the stability and performance of the resulting catalysts. Graphic Abstract DEME-TFSI-coated GO and GN are first formed via covalent bonds through functional groups (O groups) on the graphene surface, non-covalent ionic bonds, and π–π stacking interactions. In this step, N, S, and F groups are weakly bonded with graphene. Stable pyridine and pyrrole structures could then be generated via dehydration and decarbonylation under a controlled temperature and pressure in the hydrothermal process. Finally, cyclization rearrangement is carried out to form graphite with a tri-doped structure.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Shanshan Wei,Haolin Xiao,Miao Gu,Zhencheng Chen,Liangli Cao
In this study, a sensitive and quantitative label-free electrochemical immunosensor based on bimetallic [email protected] nanoparticles , Prussian blue (PB), and reduced graphene oxide-tetraethylene pentamine nanocomposite (rGO-TEPA) was constructed to achieve sensitive detection of HBsAg. A one-pot green method was used to synthesize interlocked rGO-TEPA/PB hybrid composites as high-performance materials with good conductivity . PB was the electron transfer mediator used to provide electrochemical signals. By utilizing rGO-TEPA as supporting material , the stability and intensity of PB were greatly improved. The incorporation of highly conductive [email protected] nanoparticles could further amplify the electrochemical signal, and the high adsorption capacity could provide an efficient substrate for hepatitis B surface antibody (HBsAb) immobilization. Under optimal conditions, the immunoassay had a wide linear range from 0.25 pg mL −1 to 400 ng mL −1 and a low detection limit of 0.08 pg mL −1 (S/N = 3). This method was also applied to the analysis of human serum samples, and the obtained results were on par with those of electrochemiluminescence immunoassay (ECLIA), suggesting significant potential for this new method in clinical research.
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Nano Research
·
2021
·Vol. 14
·期 12
·4696-4703
·
IF 8.897
Sun Xiuping,Wang Lu,Li Chuanchuan,Wang Debao,Sikandar Iqbal,Man Ruxia,Tian Fang,Qian Yitai,Xu Liqiang
Sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) have been considered as attractive alternatives for next-generation battery systems, which have promising application potential due to their earth abundance of potassium and sodium, high capacity and suitable working potential, however, the design and application of bi-functional high-performance anode still remain a great challenge up to date. Bismuth sulfide is suitable as anode owing to its unique laminar structure with relatively large interlayer distance to accommodate larger radius ions, high theoretical capacity and high volumetric capacity etc. In this study, dandelion-like Bi 2 S 3 /rGO hierarchical microspheres as anode material for PIBs displayed reversible capacity, and 206.91 mAh·g −1 could be remained after 1,200 cycles at a current density of 100 mA·g −1 . When applied as anode materials for SIBs, 300 mAh·g −1 could be retained after 300 cycles at 2 A·g −1 and its initial Coulombic efficiency is as high as 97.43%. Even at high current density of 10 A·g −1 , 120.3 mAh·g −1 could be preserved after 3,400 cycles. The Na 3 V 2 (PO 4 ) 3 @rGO//Bi 2 S 3 /rGO sodium ion full cells were successfully assembled which displays stable performance after 60 cycles at 100 mA·g −1 . The above results demonstrate that Bi 2 S 3 /rGO has application potential as high performance bi-functional anode for PIBs and SIBs.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhongji Qu,Yu Wang,Wei Wang,Dan Yu
The fabrication of flexible microwave absorbers with high-performance has become an arduous challenge for applications of anti-electromagnetic pollution and radar stealth technology. Herein, a series of FeCoNiOx-PDA-rGO absorbers were prepared and coated on the surface of pretreated polyimide (PI) fabric with PDA-rGO, and finally by screen printing FeCoNiOx-PDA-rGO/WPU for acquiring robust microwave absorption performance, in which the first layer of treated PI fabric was used as the microwave-reflection layer, the medium microwave absorbing powder and water-based polyurethane (WPU) hybrid coating served as the microwave-absorbing layer, and the outside hydrophobic polydimethylsiloxane (PDMS) layer was utilized as the microwave-transmission layer. The well-designed microwave absorption fabric exhibits excellent performance in the X-band (8.2–12.4 GHz). The minimum reflection loss (RL min ) value of the designed fabric can reach −74.70 dB with a thickness of 3.97 mm. Meantime, almost in the entire X-band, the sample can absorb more than 99% (RL < -20 dB) of incident electromagnetic waves. Besides, the performance can be adjusted by changing the load rate of each microwave absorbing layer to obtain lighter and thinner samples in practical applications. We believe this work will bring new inspiration to the design of flexible and wearable microwave absorbers.
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高影响因子
危险品化学品经营许可证（带存储）