ACS Applied Materials & Interfaces
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2014
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IF 5.9
Mingxi Chen,Huan Wang,Lingzhi Li,Zhe Zhang,Cong Wang,Yu Liu,Wei Wang,Jianping Gao
A facile and novel method to prepare SnO2/reduced graphene oxide (rGO) droplet aerogels with complex morphologies had been developed. This method has been named dynamic self-assemble. Aerogels with both “egg-tart” and “mushroom” shapes were obtained by this method. The changes in the graphene oxide (GO) droplet morphologies during the dynamic process of a GO droplet falling into a SnCl2 target solution were monitored using a high speed camera. The formed SnO2/rGO aerogels were then characterized by Raman spectroscopy, thermogravimetric analysis, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The microstructures of the SnO2/rGO aerogels were observed with scanning electron microscopy and transmission electron microscopy. Finally, the SnO2/rGO droplet aerogels were used as the electrode material in a symmetrical two-electrode supercapacitor and the electrochemical performance of the supercapacitor was investigated using cyclic voltammetry and galvanostatic charge/discharge methods. The SnO2/rGO electrodes demonstrated excellent electrochemical performance and stability. At a scan rate of 5 mV/s, their highest gravimetric and volumetric specific capacitances were 310 F/g and 180 F/cm3, respectively, and their energy and power densities were as high as 30 Wh·kg–1 and 8.3 kW·kg–1, respectively.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Tingli Ren,Yuanfeng Liu,Xiaoqiu Lin,Congju Li
Microbial fuel cells (MFCs) demonstrate significant potential as renewable energy devices due to their ability to harvest electrical energy from wastewater. However, sluggish extracellular electron transfer (EET) efficiency and poor biofilm colonization on the anode interface greatly restrict the power generation of MFCs. Anchoring efficient anode electrocatalysts over the anode surface has been proven to be a powerful strategy to enhance the overall performance of MFCs. Herein, anode electrocatalysts comprising carbon nanofibers in situ-doped with Fe/Fe3C nanoparticles and reduced graphene oxide (rGO/NCNFs@Fe/Fe3C) were fabricated through electrospinning, carbonization, and freeze-drying methods, based on the following considerations: (i) the excellent electrocatalytic properties and biocompatibility of Fe3C; (ii) the formation of abundant reactive sites (such as Fe–N) on the surface of carbon nanofibers induced by the doping of N and Fe elements; (iii) the aerogel structure with a huge specific surface area and excellent electrochemical properties. Therefore, an MFC with an rGO/NCNFs@Fe/Fe3C-modified anode achieved a maximum power density of 2318 mW m−2 and a maximum output voltage of approximately 0.64 V, which was significantly superior to that of the pristine carbon cloth anode. This work provides a novel strategy to improve biofilm colonization and EET, thus promoting the power generation of MFCs.
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DIAMOND AND RELATED MATERIALS
·
2024
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IF 4.3
YuXuan Xiong,Dandan Luo,Guowen He,Saiwen Liu,Jin Zhang,Chao Chen
Baicalin is a principal component of traditional Chinese medicine and plays a crucial role in treating conditions such as arthritis, respiratory tract infections, chronic and acute hepatitis, and tumors. Graphene oxide is bonded to silicon dioxide (SiO 2 ) through covalent bonds or hydrogen bonds and then reduced to SiO 2 @rGO through hydrazine hydrate to solve the problem of easy accumulation of SiO 2 and improve the conductivity of the material. Next, β-cyclodextrin (β-CD) self-assembles on SiO 2 @rGO to form a stable inclusion complex. The hydrophobic inner cavity of β-CD can effectively accommodate various guest molecules to form inclusion complexes, enhancing molecular recognition and detection capabilities. Finally, β-CD/SiO 2 @rGO is bridged and surface-loaded between clay-like Ti 3 C 2 T x (MXenes) nanosheets through electrostatic interactions to form a stable three-dimensional composite material. It is precisely because of MXenes, due to their unique layered microstructure, excellent conductivity, and extensive hydrophilic surface area, that they are conducive to self-assembly or embedding nanoparticles in aqueous solution. The composite was characterized via X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. Under optimized conditions, the electrochemical sensor constructed from this composite exhibited a broad detection range (0.008–10 μM) and a low detection limit (0.191 nM) for baicalin. In comparison to existing methods for detecting baicalin, this approach demonstrates strong anti-interference capabilities and stability. It can efficiently, sensitively, and accurately quantify baicalin in Chinese patent medicine samples, including Scutellaria baicalensis root, Shuanghuanglian oral liquid, and Bear Bile Scutellaria baicalensis eye drops, achieving a satisfactory recovery rate. This study introduces a novel approach for the electrochemical detection of baicalin.
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CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Mohammed Karama Alsebaeai,Abdul Latif Ahmad,Boon Seng Ooi
In this research, the construction of a highly wetting-resistance membrane surface was achieved through an integrated dip-coating phase inversion process to accelerate water mass transfer of membrane distillation (MD). The synergistic effect of incorporating reduced graphene oxide (rGO) embedded Poly (vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) on the surface of a PVDF hollow fiber support membrane using a dilute coating solution was studied. Various loadings of rGO nanosheets were incorporated into the dilute PVDF-HFP coating to systematically investigate its physicochemical characteristics, including surface morphology, hydrophobicity and wetting resistance which could be analyzed using scanning electron microscopy (SEM), atomic force microscopes (AFM), water contact angle (WCA), porosity measurement, pore size, x-ray diffraction (XRD), and liquid entry pressure (LEP) tests. The membrane separation performance for desalination was evaluated using direct contact membrane distillation (DCMD) process. Compared to the PVDF hollow fiber support membrane, the rGO-embedded PVDF-HFP coating layer demonstrates outstanding enhancements. The membrane surface exhibits enhanced hydrophobicity, as evidenced by an increased WCA from 105.37° (for the PVDF support membrane) to 148.37° (for the rGO/PVDF-HFP composite membrane). Additionally, the water permeability significantly improved, achieving a water flux of 25.9 kg m -2 h -1 (compared to 11.55 kg m -2 h -1 for the PVDF support membrane). These enhancements occur without compromising NaCl rejection, which remains consistently above 99.99 % (3.5 wt% NaCl aqueous solution at a feed temperature of 70 °C and a permeate temperature of 18 °C). These findings underscore the potential of rGO/PVDF-HFP in enhancing MD performance. The composite HF membrane demonstrates remarkable stability during continuous MD operation over a 48 h period. Pore wetting is effectively avoided, indicating that the composite membrane has superior resistance to wetting and excellent stability.
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MATERIALS RESEARCH BULLETIN
·
2024
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IF 5.3
Siyuan Zhang,Zisen Li,Jinlei Tao,Jian Jiao
Optimizing the composition and structure of polymers and carbon nanomaterials to obtain composite films with excellent mechanical and electromagnetic wave (EMW) properties is an excellent solution for exploring EMW absorbing materials. In this work, a flexible composite film with a regular three-dimensional network structure was designed and prepared. The modified rGO@MWCNTs/Fe 3 O 4 -PVA composite nanofilm with optimized composition and structure has a multi-component heterogeneous interface, three-dimensional network structure. The composite film has high EMW absorption performance, excellent flexibility, mechanical strength and stability, and can be used in a wide range of application scenarios. At a thickness of 2.8 mm, the effective absorption bandwidth ( f E ) reaches 3.72 GHz, the minimum reflection loss (RL min ) is -48.99 dB, and the tensile stress reaches 32 MPa. This work realizes the regulation of the mechanical properties and EMW absorbing properties of the composite film, and provides an efficient and stable flexible composite EMW absorbing material.
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RSC Advances
·
2025
·Vol. 15
·期 42
·35068-35076
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IF 4.6
Xu Han,Haozhen Li,Ling Niu
This study introduces a novel electrochemical aptasensor designed for the sensitive detection of lactate in athlete sweat. The sensor is based on a PEI-rGO-modified SPCE coupled with AuPt NPs, and utilizes Na+-assisted DNAzyme for signal amplification. The PEI-rGO modification enhances the aptasensor's conductivity, while the AuPt NPs efficiently load MB and LDNA, generating stable electrochemical signals. Furthermore, the Na+-dependent DNAzyme leverages the Na+ naturally present in sweat to activate the cleavage process, amplifying the detection signal. The sensor exhibits a strong linear relationship between current response and lactate concentration in the range of 5 × 10−3 to 10 mM, with a limit of detection (LOD) of 2.974 μM. It demonstrates excellent specificity, stability, and repeatability. The optimized aptasensor offers significant potential for real-time, non-invasive lactate monitoring, particularly in athletic performance and health assessment. This work provides a promising approach for the development of reliable, portable biosensors for tracking lactate metabolism, with implications for sports science and health management.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
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IF 7.963
Ze Lin,Xiulan Weng,Nasreen Islam Khan,Gary Owens,Zuliang Chen
The annual influx of antimony (Sb) into the environment due to the widespread use of Sb compounds in industry and agriculture has become of global concern. Herein, a functional nanomaterial composite based on loading bimetallic iron/nickel nanoparticles on reduced graphene oxide (rGO-Fe/Ni) was initially prepared in a one-step phytogenic synthesis using a green tea extract. Subsequently, when applied for Sb(III) removal, the removal efficiency of rGO-Fe/Ni reached 69.7% within 3 h at an initial Sb concentration of 1.0 mg·L −1 . Advanced materials characterization via scanning electron microscopy-energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy revealed that Sb(III) was initially adsorbed onto the surface of rGO and then oxidized to Sb(V). This result was also supported by adsorption isotherm, kinetics, and thermodynamic analysis. These studies revealed that the adsorption was spontaneous and endothermic, following a Langmuir adsorption model with pseudo-second-order kinetics and allowed a Sb(III) removal mechanism based on adsorption and catalytic oxidation to be proposed. Furthermore, when rGO-Fe/Ni was practically used to remove Sb(III) in groundwater a 95.7% removal efficiency was obtained at 1 mg·L −1 Sb(III), thus successfully demonstrating that rGO-Fe/Ni has significant potential for the practical remediation of Sb contaminated groundwater.
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Chunyan Zhang,Shuan Zhang,Yilei Jia,Yueyun Li,Ping Wang,Qing Liu,Zhen Xu,Xinjin Li,Yunhui Dong
An ultrasensitive sandwich-type electrochemical immunosensor was designed by using gold nanoparticles (Au NPs) as the substrate material and microporous carbon spheres (CS) loading silver nanoparticles (Ag NPs) spaced Hemin/reduced graphene oxide (Hemin/rGO) porous composite materials (Ag NPs@CS-Hemin/rGO) as the detection antibodies (Ab 2 ) label for detecting carcinoembryonic antigen (CEA). The Au NPs with good electrical conductivity and biocompatibility could accelerate the electron transfer on the electrode interface and enhance the load capacity of capture antibodies (Ab 1 ). Hemin is peroxidase-like substance which has excellent catalytic ability for H 2 O 2 reduction but easy to molecular aggregation and oxidative self-destruction. Reduced graphene oxide (rGO) is a good supporting material for Hemin to mitigate this disadvantage. CS loading Ag NPs (Ag NPs@CS) as the spacer inserts into Hemin/rGO sheet can overcome the irreversible stacking of rGO, and form complex porous structure which exposes more active sites of Hemin. Moreover, Ag NPs loaded on CS also has catalytic ability for H 2 O 2 reduction. Thus the Ag NPs@CS-Hemin/rGO used as the Ab 2 label has a large working surface area and high utilization rate, which heightens the catalytic ability for H 2 O 2 reduction to amplify the current signal effectually. The current signal and the logarithm of CEA concentration presented a wide linear response range of 20 fg/mL to 200 ng/mL, and the detection limit of CEA was 6.7 fg/mL. Furthermore, the designed immunosensor exhibited a good reproducibility, selectivity and stability, which confirms a broad development prospect when applying it in early clinical detection.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 9
·3472-3484
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IF 4.569
Lei Xu,Zhipeng Gong,Yinglin Qiu,Wenbo Wu,Zunxian Yang,Bingqing Ye,Yuliang Ye,Zhiming Cheng,Songwei Ye,Zihong Shen,Yuanqing Zhou,Qiaocan Huang,Zeqian Hong,Zongyi Meng,Zhiwei Zeng,Hongyi Hong,Qianting Lan,Tailiang Guo,Sheng Xu
Metal sulfides, one kind of electrode material with very high theoretical capacity, have been widely studied for use in lithium and sodium ion batteries. However, there are some problems hindering their applications in electrodes, such as low conductivity and volume expansion. The MOF introduces metals with different coordination strengths into an existing MOF structure, which improves the performance of the electrode to a certain extent. In this paper, Fe/Zn bimetallic MOF rod-like superstructure was prepared based on Ostwald theory. Accompanied by sulfuration, the MOF was effectively combined with MoS2 and GO, and the objective materials Fe7S8-C/ZnS-C@MoS2/rGO composites were successfully prepared. The MOF material provides a good frame and an efficient electron transport path, while the robust rGO wall effectively inhibits the pulverization of materials during the lithium/sodium intercalation/escalation courses. This particular material exhibited excellent cycling and rate capability performance when used in Li/Na-ion batteries. When used in Li-batteries, the electrode material delivered a specific capacity of 1598.3 mA h g−1 at 0.1 A g−1 and remained at 1196.7 mA h g−1 even after about 100 cycles and further exhibited a specific capacity of 368.68 mA h g−1 at the current rate of 5 A g−1 even after 1000 cycles, respectively. As for sodium batteries, these electrode materials exhibited an initial reversible capacity of 1053.6 mA h g−1 at 0.1 A g−1 and the reversible capacity was still as high as 592.2 mA h g−1 after 200 cycles. It is perhaps that this composite material with its particular architecture and composition is greatly beneficial for electron transfer and Li/Na ion diffusion. In the repeated physicochemical/nutrifying process, the appropriate distance between adjacent MOFs is of great help in preventing volume changes and thus improving the electrochemical performance.
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FOOD CONTROL
·
2025
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IF 6.3
Xishun Peng,Zhongchen Bai,Caizhen Zu,Yuxue He,Qi Zhao
The presence of thiram residues on fruit peels posed a significant risk to human health. Here, we prepared an electrochemical surface-enhanced Raman spectroscopy (EC-SERS) sensor of SPE/RGO/Au@Ag flexible film to detect thiram residues on fruit peel. The surface of this film was evenly covered with Au@Ag nanoparticles, which allowed it to specifically identify thiram residues through the formation of Ag-S bond. In addition, an electrochemical method was used to modulate the energy level matching between the SERS film and the thiram molecules to improve the chemical enhancement effect of the SERS. The results indicated that the charge transfer degree between the SERS film and the thiram molecules was up to 0.875. The SPE/RGO/Au@Ag film achieved a limit of detection (LOD) of 2.1 pM at -1.3 V. Owing to its excellent SERS performance, the SPE/RGO/Au@Ag film could successfully recognize the thiram residues on apple and orange peels, with recoveries of 91% to 107% and from 89% to 102%, respectively. The flexible EC-SERS sensor offers considerable promise for sensitively recognizing thiram residues on fruit peels.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Wenjin Zhu,Jiaoyang Mi,Yuqin Fu,Donghui Cui,Changli Lü
A novel photocatalyst was developed by combining TiO 2 (P25), reduced graphene oxide (rGO), and multi-core@shell clustered carbon dots (CDs) by one-step hydrothermal method for the high efficiency visible-light degradation of organic dyes and antibacterial application. The as-synthesized CDs were used as photosensitizers of P25 to effectively broaden its visible absorption region from 410 to 800 nm. Meanwhile, the effects of different contents of CDs and rGO on the photocatalytic performance were systematically studied, in which 2% CDs/0.5% rGO/P25 composite displayed the most efficient photocatalytic degradation for organic dyes and photocatalytic antibacterial performance under visible light irradiation. The corresponding degradation rate constant of 2% CDs/0.5% rGO/P25 for RhB was 29, 2.8 and 1.3 times more than those of P25, rGO/P25, and CDs/P25 composite, respectively. This unique multi-core@shell clustered CDs played a vital role in improving the photocatalytic activity of the CDs/rGO/P25 composite, increasing visible light absorption, and promoting electron-hole pairs separation.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Wenjun Liu,Zhaohui Li
Metallic Au nanoparticles (NPs) are active catalysts in many chemical reactions. However, small-size Au NPs are difficult to obtain since they tend to agglomerate due to their high surface energies. Herein, we reported a facile and green hydrothermal process, using graphene oxide (GO) as the RGO precursor, HAuCl 4 as Au precursor and L-cysteine (L-cys) as both cross-linker and reducing agent, to fabricate an Au/RGO composite aerogel. During the hydrothermal process, the reduction of GO/HAuCl 4 , the oxidation of L-cys to produce disulfide linkage, and the self-assembly of RGO aerogel occurs simultaneously, leading to the resultant RGO aerogels uniformly and intimately embedded with disulfide protected ultrasmall Au NPs with an average size of 1.3 nm. The as-obtained Au/RGO composite aerogel exhibited superior catalytic performance for reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), with a total transformation of 4-NP achieved in 4 min. The much higher activity over Au/RGO aerogel as compared with unsupported thiol-capped Au NPs can be attributed to the synergistic effect of metallic Au and RGO. Moreover, Au/RGO composite aerogel also showed high stability and can be easily separated from the reaction systems for recycling. No obvious decrease of catalytic reduction activity was observed over the Au/RGO aerogel after five cycles. Considering the high price of metallic Au, the embedding of Au NPs in three-dimensional RGO aerogels to facilitate its recycling is extremely appealing for its practical applications.
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