INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Xiaoqiong Du,Chenlu Yang,Xiang Zeng,Tong Wu,Yinghui Zhou,Ping Cai,Gongzhen Cheng,Wei Luo
Transition metal phosphide based amorphous NiP/rGO hybrids have been successfully synthesized through a facile one-pot co-reduction method. The prepared NiP/rGO hybrids are characterized by powder X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM) and energy dispersive X-ray detector (EDX) techniques. Compared with Ni/rGO, the resulted Ni 91 P 9 /rGO hybrid exhibits superior catalytic activity toward hydrogen generation from hydrolysis of ammonia borane (NH 3 BH 3 ), with turnover frequency (TOF) value of 13.3 min −1 . The activation energy (Ea) of Ni 91 P 9 /rGO for this reaction is calculated to be 34.7 kJ mol −1 , which is much lower than those of the other reported catalysts. This superior catalytic performance may be due to the good dispersibility of Ni 91 P 9 nanoparticles and the synergistic electronic interactions between nickel and phosphorus.
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NANOTECHNOLOGY
·
2016
·Vol. 28
·期 2
·025501
·
IF 3.573
Bingrong Wang,Yang Cao,Yong Chen,Xiaoyong Lai,Juan Peng,Jinchun Tu,Xiaotian Li
NiCo2O4 nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu2O/GO and fabricated NiCo2O4/rGO nanocomposites based on a Cu2O/GO template. The structure and morphology of the hierarchical NiCo2O4/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo2O4/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo2O4/rGO could achieve high-sensitivity detections of glucose. The NiCo2O4/rGO composite has a detection range of 0.04 mM to 1.28 mM, a sensitivity of 2082.57 μA mM−1 cm−2, and a detection limit of 0.7 μM. The composite further exhibits obvious stability, superior reproducibility, and excellent selectivity. This study demonstrates that NiCo2O4/rGO is a unique and material with high potential in glucose sensing.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 114
·113298-113306
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IF 3.289
Yan Yuan,Bo Peng,Hang Chi,Cong Li,Ren Liu,Xiaoya Liu
We report the preparation of poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles (NPs) and graphene oxide (GO) ink-based layer-by-layer inkjet printing humidity sensors. Sulfonate polystyrene:PEDOT NPs (SPS:PEDOT NPs) were prepared with hard template SPS NPs and GO was synthesized through a modified Hummers' method. Next, the SPS:PEDOT NP/GO multilayer films were printed layer by layer, with one layer of GO followed by one layer of SPS:PEDOT NP ink on the flexible poly-ethylene terephthalate (PET) substrate by using a home inkjet printer. The morphology and structure of the SPS:PEDOT NPs and GO were characterized through TEM and Raman spectroscopy and those of the film were investigated through optical microscopy. SPS:PEDOT NP-reduced GO (SPS:PEDOT NP/RGO) composite sensors were obtained after thermal annealing. To assess their humidity sensing properties, the sensors were exposed to a wide range of relative humidities (RH 0–98%) at room temperature. The SPS:PEDOT NP/RGO PET-based sensor exhibited superior humidity sensing properties in a wide response range (0.13–68.46%), short response and recovery time (39 and 57 s, respectively), and excellent repeatability and flexibility. The resistance of sensors was almost invariable even after folding 200 times. Overall, the SPS:PEDOT NP/RGO PET-based sensors can be used as humidity sensors.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Jiantao Feng,Yanhui Hou,Yechen Wang,Liangchao Li
Hierarchical structured ZnFe2O4@SiO2@RGO core–shell nanocomposites were prepared via a “coating–coating” route, and its structure, composition and electromagnetic properties were characterized. Compared with the binary composites of ZnFe2O4@SiO2, the hierarchical ZnFe2O4@SiO2@RGO ternary composites exhibited enhanced electromagnetic wave (EMW) absorption properties in terms of the effective bandwidth and minimum reflection loss (RL). Furthermore, EMW absorption properties of the prepared samples can be tuned by changing RGO content and thickness of SiO2 layer to reach the best impedance match. The minimum RL of the sample with a thickness of 2.8 mm can reach −43.9 dB at 13.9 GHz, and its effective bandwidth (RL ≤ −10 dB) was up to 6 GHz. Hence, the obtained products can be a new candidate for lightweight EMW absorbing materials.
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RSC Advances
·
2016
·Vol. 6
·期 113
·112581-112588
·
IF 3.289
Yumeng Liu,Xiao Zhang,Junpeng Wang,Ping Yang
Thin graphitic C3N4 nanosheets (g-C3N4 NS) with bright blue photoluminescence were prepared through an acid and alkali corrosion and ultrasonic-assisted method. g-C3N4 NS/reduced graphene oxide (RGO) sample which was prepared through a hydrothermal synthesis offered high separation and transfer efficiency of photogenerated carriers because of the thin g-C3N4 NS attached closely to the RGO. The introduction of RGO sheets provided prominent advantages for enhanced light absorption and promoted the transfer rate of photogenerated carriers from g-C3N4 NS. A g-C3N4 NS/RGO (3 : 2) composite not only functions as a sensor to detect Pb2+ and Cd2+ in an aqueous solution but also exhibits efficient visible-light photocatalytic performance. The application in a sensor is ascribed to the intercalation impact between thin g-C3N4 NS and heavy metal ions. Owing to the presence of more active functional groups (e.g., carboxyl and amino groups) on the surface of the g-C3N4 NS compared with the bulk form, the ions can be easily adsorbed onto g-C3N4 NS. The g-C3N4 NS/RGO composites are highly sensitive and selective in ion sensing, as well as having superior photocatalytic activity.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Xiaojuan You,Yumei Chen,Jingming Zhou,Hongliang Liu,Yankai Liu,Yanhua Qi,Chao Liang,Peiyang Ding,Xifang Zhu,Aiping Wang,Gaiping Zhang
Concanavalin A (ConA), as a carrier for immobilizing antibodies, was used for the first time in electrochemical immunosensor. In this work, a label-free electrochemical immunosensor based on Ag nanoparticles-reduced graphene oxide (AgNPs-rGO) nanocomposite and ConA was successfully prepared to detect arsanilic acid (ASA). AgNPs-rGO nanocomposite displayed superior conductivity and redox capability. Specially, ConA showed excellent binding ability with monoclonal antibody of ASA through lectin-sugar interactions. Under the optimized conditions, the proposed electrochemical immunosensor showed a linear dependence over ASA concentrations ranging from 0.025 ng/mL to 25 ng/mL with a low detection limit of 0.011 ng/mL. Furthermore, the immunosensor was used to monitor ASA in chicken and egg with good precision and accuracy. In conclusion, the simple and low-cost immunosensor was desirably applied as a useful candidate for detection of ASA in animal derived food.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Mei Lin,Miao Wang,Jianwang Wu,Ming Liu,Zuliang Chen
Since the widespread use of antibiotics, the residues of antibiotics have frequently been detected in various water sources, making antibiotic pollution an urgent environmental issue. In this paper, one-step green synthetic reduced graphene/manganese nanoparticles (rGO/Mn NPs) composites have been utilized as a novel environmentally-friendly catalyst for tetracycline (TC) removal. The results demonstrated that rGO/Mn NPs exhibit excellent adsorption performance for TC, and can efficiently activate sodium persulfate (PDS) to oxidize and degrade TC. Furthermore, the rGO/Mn NPs adsorption-oxidation system (85.2%) was more effective than the adsorption process (70.9%) in removing TC (50 mg L −1 ). Free radical quenching experiments and EPR results elucidated that singlet oxygen ( 1 O 2 ) and superoxide radicals (·O 2 − ) are the primary reactive species responsible for the degradation of TC in the oxidation system. Based on the characterization results, a mechanism of oxidative degradation of TC by rGO/Mn NPs has been proposed. To further elucidate the degradation pathway of TC, the degradation products were identified by high performance liquid chromatography-mass spectrometry (HPLC-MS). This analysis provides a foundation for understanding how the rGO/Mn NPs composites activate PDS to degrade TC. Additionally, the ecological structure-activity relationship analysis revealed that TC is converted into intermediates with lower toxicity.
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SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Xuehu He,Chunyan Chen,Yuheng Liu,Jiancai Le,Guoqing Xiao,Chunlin Chen,Yucheng Wang,Jian Zhou
Cactus-like ZnO@three-dimensional reduced graphene oxide aerogels (3D rGA) were obtained via a hydrothermal method. The 3D rGA had an interconnected large-size network structure, and cactus-like ZnO nanoparticles were uniformly distributed on the 3D rGA. The gas sensors based on cactus-like ZnO@3D rGA showed a high response (81.07) and a fast response/recovery time (15/27 s) to 10,000 ppm hydrogen at room temperature (25 ℃), as well as an excellent stability and selectivity toward hydrogen. The improved hydrogen sensing performance of this 3D structure was mainly related to the high conductivity and porous structure of reduced graphene oxide. Besides, the p-n heterojunction formed between ZnO and reduced graphene oxide was also a significant factor for the performance improvement. The results indicated that the cactus-like ZnO@3D rGA material was promising for the detection of hydrogen at room temperature.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Shakeel Abbas,Tanveer Hussain Bokhari,Mudasir Abbas,Zahid Abbas,Atia Khalid,Saqib Javed,Amina Zafar,Naeem Ahmad,Shafqat Karim,Athar Javed,Ting Zhu,Amjad Nisar,Mashkoor Ahmad
Electrodes material and electrolytes play an important role in defining energy storage performance of supercapacitors. Therefore, the selection of suitable electrode material as well as electrolyte is very crucial. In this work, hematite α-Fe 2 O 3 nanoparticles supported rGO structure is synthesized by a low cost co-precipitation approach. The developed electrode is investigated for supercapacitor in 1.0 M KOH, Na 2 SO 4 and aqueous hybrid electrolyte. It is found that the fabricated (α-Fe 2 O 3 /rGO) electrode delivers an improved specific capacitance of 1272 F g −1 at 1 A g −1 in hybrid electrolyte as compare to 700 F g −1 for KOH and 978 F g −1 for Na 2 SO 4 electrolyte. Moreover, the electrode shows excellent cyclic stability in contrast to the pristine α-Fe2O3 electrode. Interestingly, the assembled prototype asymmetric coin cell supercapacitor (α-Fe 2 O 3 /rGO//AC) device achieved a specific capacitance of 152 F g −1 at 1 A g −1 and energy density of 47.1 Wh kg −1 at a power density of 245.5 W kg −1 . Moreover, the device keeps 94% capacitance retention up to 8,000 cycles at 6 A g −1 . The improved performance is attributing to the increase in conductivity and charge kinetics in hybrid electrolyte. It is suggested that α-Fe 2 O 3 /rGO structure is a useful material for supercapacitors in the presence of hybrid electrolyte.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-15
·
IF 2.8
Suguna A.,Parthibavarman M.,Sridevi C.,Al-Mohaimeed A. M.,Al-onazi W. A.
New ternary nanocomposites for photocatalysis, composed of ZnFe 2 O 4 @ZnO@rGO, were synthesised in this work using a straightforward hydrothermal method. After characterising the samples' structures, morphologies, and photoelectric outcomes, researchers found that 25–30 nm ZnFe 2 O 4 @ZnO nanoparticles were securely attached to the surface of the rGO sheets' fibres. The photocatalytic activity in the deterioration of rhodamine B (RhB) was much enhanced by the ZnFe 2 O 4 @ZnO@rGO composite photocatalysts when compared to ZnO, ZnFe 2 O 4 , and ZnFe 2 O 4 @ZnO. With a degradation efficiency of 99.9% for RhB and 88.7% for MB after 60 min of ultraviolet (UV) radiation, the ZnFe 2 O 4 @ZnO@rGO composite photocatalyst stood out as the most active photocatalyst. In addition, this nanocomposite exhibited excellent adaptability for use in water treatment, since it could be magnetised apart and maintained a dye removal percentage of about 100% after eight cycles. Analysis of the photodynamic response and TRPL spectra further verified that the manufactured ternary composite had improved charge transfer efficiency. The synergy of multicomponent ternary nanocomposites may have contributed to the enhanced performance by increasing absorption capacities automatically, discouraging the reconsolidation of electron–hole couples, and inducing the photodeveloped separation of proteins.
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DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Xinjia Yang,Xueyue Lyu,Guangdong Zhao,Dongyu Zhao
Nitrogen-doped carbon electrode materials with porous structures loaded with metal nanoparticles are considered promising candidates for supercapacitor applications, as they enhance electron transfer and shorten ion diffusion pathways. In the synthesis of polystyrene microspheres, graphene oxide combined with Ni 2+ and Ag + is introduced and carbonized under the protection of argon gas at 900 °C. A highly defective 3D porous framework is formed, achieving reduction of graphene oxide (rGO/Ni-Ag/CP) and the formation of Ni Ag nanoparticles on the graphene oxide sheets, which act as an effective electrochemical active site. Thus, the charge storage of supercapacitors is improved to achieve high-performance capacitance characteristics. The core-shell structure with polyaniline as the shell layer was prepared via in-situ polymerization. After the second carbonization, the material (rGO/Ni-Ag/CP@CPANI) was obtained. Electrochemical analysis reveals that the material demonstrates a specific capacitance of 383.6 F g −1 at 0.5 A g −1 , with an impressive capacitance retention of 93.9 % after 10,000 cycles. The assembled symmetric supercapacitor exhibits an energy density of 15 Wh kg −1 and a power density of 6000 W kg −1 , showing its excellent performance for energy storage applications.
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Journal of Analysis and Testing
·
2025
·
IF 7
Chen Lu,Shao Rong,Bao Chengqi,Deng Lei,Yang Minghui,Li Xiaoqing
The preparation of a sensitive electrochemical biosensor for lactate determination, devoid of lactate enzyme, is achieved through the integration of cobalt nitride and reduced graphene oxide nanosheets. The sensing platform comprises porous cobalt nitride with lactate oxidase mimic activity for efficient lactate oxidation. The incorporation of reduced graphene oxide nanosheets with a large surface area and high electron-transfer rate enhances the response current. The electrochemical biosensor exhibits good sensing performance for lactate in a neutral solution, which has a linear detection range of 1–80 mM with a detection limit of 0.51 mM via differential pulse voltammetry (DPV) measurement. Notably, the sensing platform also shows good stability and selectivity and was successfully applied to determine lactate in human serum samples.
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