ACS Omega
·
2021
·
IF 3.512
Hangchun Deng,Jie Huang,Zhiyong Hu,Xiangfei Chen,Dejuan Huang,Tianxiang Jin
A three-dimensionally interconnected molybdenum trioxide (MoO3)/polypyrrole (PPy)/reduced graphene oxide (rGO) composite was synthesized via an eco-friendly three-step method. The as-obtained electrode shows a high specific capacity of 412.3 F g–1 at a current density of 0.5 A g–1 and a good cycling stability (85.1% of the initial specific capacitance after 6000 cycles at 2 A g–1 is retained), and these excellent electrochemical performances can be attributed to the unique structure, remarkable electrical conductivity, and the synergetic effects between MoO3, PPy, and rGO. Furthermore, a symmetric supercapacitor based on a MoO3/PPy/rGO electrode was assembled to investigate the practical application performance of this material. The results demonstrate a high energy density of 19.8 W h kg–1 at a power density of 301 W kg–1. These findings shine a light on the rational design of electrode materials with multicomponents for high-performance supercapacitors.
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PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·141
·
IF 4.034
Guangzhen Cui,Yanli Lu,Wei Zhou,Xuliang Lv,Jiangnan Hu,Guoyu Zhang,Guangxin Gu
Magnetic nanoparticles, such as Fe3O4and Co3O4, play a vital role in the research on advanced microwave absorbing materials, even if problems such as high density and narrow band impedance matching are still unsolved. Herein, the study of lightweight hollow Fe3O4@reduced graphite oxide (RGO) nanocomposites synthesized via the solvothermal method is presented. The microstructure and crystal morphology of the materials were characterized by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses. Single crystalline hollow Fe3O4spheres were grown onto RGO flakes, leading to the formation of heterojunction, which further influenced the microwave absorption properties. The latter were evaluated by standard microwave characterization in the frequency range of 2–18 GHz. It was found that, for a specific Fe3O4@0.125 g RGO composite, the minimum reflection loss can reach −41.89 dB at 6.7 GHz, while the reflection loss was less than −10 dB from 3.4 GHz to 13.6 GHz for a nanocomposite sample thickness in the range of 1–4 mm. The combination of these two materials thus proved to give remarkable microwave absorption properties, owing to enhanced magnetic losses and favorable impedance matching conditions.Keywords:microwave absorption;solvothermal;heterojunction;hollow Fe3O4
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高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 1
·1-11
·
IF 6.048
Wang Xiaoying,Zhang Haiguang,Wang Xu,Chen Shuo,Yu Hongtao,Quan Xie
Reduced graphene oxide (RGO) membranes are theoretically more conducive to the rapid transport of water molecules in their channels compared with graphene oxide (GO) membranes, as they have fewer oxygen-containing functional groups and more non-oxidized regions. However, the weak hydrophilicity of RGO membranes inhibits water entry into their channels, resulting in their low water permeability. In this work, we constructed wettable RGO-MXene channels by intercalating hydrophilic MXene nanosheets into the RGO membrane for improving the water permeance. The RGO-MXene composite membrane exhibits high pure water permeance of 62.1 L/(m 2 ·h·bar), approximately 16.8 times that of the RGO membrane (3.7 L/(m 2 ·h·bar)). Wettability test results and molecular dynamics simulations suggest that the improved water permeance results from the enhanced wettability of RGO-MXene membrane and increased rate of water molecules entering the RGO-MXene channels. Benefiting from good conductivity, the RGO-MXene membrane with electro-assistance exhibits significantly increased rejection rates for negatively charged dyes (from 56.0% at 0 V to 91.4% at 2.0 V for Orange G) without decreasing the permeate flux, which could be attributed to enhanced electrostatic repulsion under electro-assistance.
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 23
·4138
·
IF 5.719
Weihua Qin,Yueming Ma,Ting He,Jingbin Hu,Pan Gao,Shaoxia Yang
A heterogeneous Fenton-like catalyst with single redox site has a rate-limiting step in oxidant activation, which limited its application in wastewater purification. To overcome this, a bimetallic doping strategy was designed to prepare a heterogeneous Fenton-like catalyst (Fe-Mo/rGO) with a double-reaction center. Combined with electrochemical impedance spectroscopy and density functional theory calculation, it was confirmed that the formation of an electron-rich Mo center and an electron-deficient Fe center through the constructed Fe-O-Mo and Mo-S-C bonding bridges induced a higher electron transfer capability in the Fe-Mo/rGO catalyst. The designed Fe-Mo/rGO catalyst exhibited excellent sulfamethazine (SMT) degradation efficiency in a broad pH range (4.8–8.4). The catalytic performance was hardly affected by inorganic anions (Cl−, SO42−and HCO3−) in the complicated and variable water environment. Compared to Fe/rGO and Mo/rGO catalysts, the SMT degradation efficiency increased by about 14.6 and 1.6 times in heterogeneous Fenton-like reaction over Fe-Mo/rGO catalyst. The electron spin resonance and radical scavenger experiments proved that ·O2−/HO2· and1O2dominate the SMT removal in the Fe-Mo/rGO/H2O2system. Fe and Mo, as active centers co-supported on rGO, significantly enhanced the electron transfer between catalyst, oxidant, and pollutants, which accelerated the reactive oxygen species generation and effectively improved the SMT degradation. Our findings offer a novel perspective to enhance the performance of heterogeneous Fenton-like catalysts by accelerating the electron transfer rate in the degradation of organic pollutants.Keywords:heterogeneous Fenton-like reaction;Fe-Mo dual-reaction-center catalyst;reactive oxygen species;sulfamethazine
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高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 11
·1067-1073
·
IF 0
Wu Wenwen,Wang Sui
In this work, we reported a luminol electrochemiluminescence (ECL) sensor using a composite material compounded by ZnO nanoparticles and reduced graphene oxide (ZnO/RGO) as electrode membrane and in situ generated hydrogen peroxide as coreactant. The composite material was characterized
by fourier transform infrared spectroscopy analysis (FTIR) and X-Ray powder diffraction (XRD). Then this ZnO/RGO modified electrode was used to determine tetracaine hydrochloride (TA· HCl). Results show that the inhibition of ECL intensity increased with logarithm of TA · HCl
concentration within a linear range from 10–4
μg/mL to 10–2
μg/mL and the detection limit (S/N) was 3.3 × 10–5
μg/mL. In addition, the recoveries of real samples were 85.0%–104.0% (urine),
95.0%–127.4% (serum) and 87.0%–104.6% (raw material drug) respectively, demonstrating an acceptable reproducibility of this method.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Qiao Zhang,Chaoyang Shi,Enze Zhu,Weiping Liu,Kun Liu,Yuhui Li,Wei Li,Xikun Yang,Juan Yu,Mingli Xu
A novel and high-efficiency Pd/TM x O y -rGO/CFP (TM x O y = Co 3 O 4 , Mn 3 O 4 , Ni(OH) 2 ) electrocatalyst for directly integrated membrane electrode was synthesized by controllable cyclic voltammetry electrodeposition combined with hydrothermal process. The results showed excellent performance towards methanol oxidation reduction. The Pd/Co 3 O 4 -rGO/CFP as-prepared catalyst has the best electrocatalytic activity , and mass activity is 5181 mA·mg −1 Pd , which is about 40 times and 4.3 times that of the commercial Pd/C and Pt/C catalyst (JM). It can be attributed that the small size of Pd nanoparticle , uniformity of distribution, and the synergistic interaction between transition metal oxide on the support surface and Pd nanoparticles. The prepared Pd/TM x O y -rGO/CFP composite electrode is a promising catalyst for integrated membrane electrode assembly of proton exchange membrane fuel cells in the future.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Xiaoqian Dong,Xiaochen Yu,Xu Zhang,Zhehan Zhang,Xiao He,Ruru Wei,Youru Bai,Jibin Fan
Tb-ZnO/reduced graphene oxide (Tb-ZnO/RGO) nanocomposites were prepared by a simple one-step solvothermal method. The samples were characterized by XRD , SEM, XPS, BET, FT-IR, and Raman spectroscopy , and their photocatalytic activities toward different pollutants (RhB, MO, PR, and MB) degradation were evaluated. Tb-ZnO/RGO nanocomposite shows enhanced photocatalytic activity with high kinetic constants (0.04 min −1 ) and good stability. Enhanced charge separation and migration have been analyzed using UV–Vis absorption spectra , PL spectra, and EIS analysis. Improved photocatalytic activity can be ascribed to the smaller band gap, larger specific surface area (28.3478 m 2 /g) and more effective separation and transport of photogenerated carriers by Tb 3+ and RGO. All the results show that the nanocomposite catalyst has a good application prospect in the degradation of pollutants.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yu Rao,Kongjun Zhu,Guoliang Zhang,Feng Dang,Jiatao Chen,Penghua Liang,Zhihan Kong,Jun Guo,Hongjuan Zheng,Jie Zhang,Kang Yan,Jinsong Liu,Jing Wang
Molybdenum sulfide has been widely investigated as a prospective anode material for Li+/Na+ storage because of its unique layered structure and high theoretical capacity. However, the enormous volume variation and poor conductivity limit the development of molybdenum sulfide. The rational design of a heterogeneous interface is of great importance to improve the structure stability and electrical conductivity of electrode materials. Herein, a high-temperature mixing method is implemented in the hydrothermal process to synthesize the hybrid structure of MoS2/V2O3@carbon-graphene (MoS2/V2O3@C-rGO). The MoS2/V2O3@C-rGO composites exhibit superior Li+/Na+ storage performance due to the construction of the interface between the MoS2 and V2O3 components and the introduction of carbon materials, delivering a prominent reversible capacity of 564 mAh g–1 at 1 A g–1 after 600 cycles for lithium-ion batteries and 376.3 mAh g–1 at 1 A g–1 after 450 cycles for sodium-ion batteries. Theoretical calculations confirm that the construction of the interface between the MoS2 and V2O3 components can accelerate the reaction kinetics and enhance the charge-ionic transport of molybdenum sulfide. The results illustrate that interfacial engineering may be an effective guide to obtain high-performance electrode materials for Li+/Na+ storage.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Xin-Yang Lu,Sheng-Feng Zhang,Fen-Ying Kong,Zhong-Xia Wang,Heng-Ye Li,Hai-Lin Fang,Wei Wang
In this paper, a glassy carbon electrode (GCE) modified with TiO 2 -ZnO-reduced graphene oxide (TiO 2 -ZnO-rGO) nanocomposites was designed for the selective and simultaneous quantification of hydroquinone (HQ) and catechol (CA). The TiO 2 -ZnO-rGO nanocomposites were prepared by a simple ultraviolet irradiation method for the first time. In the process of ultraviolet radiation, the photogenerated electrons in TiO 2 and ZnO were transfered into GO which was then reduced to form rGO. Benefiting from functional properties of different components and synergistic effect, the TiO 2 -ZnO-rGO nanocomposites exhibited excellent sensing performance for the selective and simultaneous determination of HQ and CA. Under the optimized conditions, the linear ranges for selective assay of HQ or CA in the existence of 40 µM of the respective isomer are 5–500 µM. The linear ranges for simultaneous assay of HQ and CA are obtained from 0.1 to 100 µM with the detection limits of 0.03 µM (HQ) and 0.05 µM (CA), respectively. The TiO 2 -ZnO-rGO/GCE also displayed excellent stability and satisfactory recovery when applied for real water samples analysis.
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高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Jiangle Yi,Zhen Liu,Jianhui Liu,Hanbiao Liu,Fangquan Xia,Dong Tian,Changli Zhou
A novel label-free electrochemical aptasensor was fabricated based on a three-dimensional porous electrode (3D-CS/rGO/GCE) for the detection of acetamiprid residues. The sensing signal was generated by the DNA itself. The porous electrode was prepared by electrodeposition in situ and characterized by scanning electron microscope (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). These results indicated that the porous electrode has a uniform nanoporous structure, high active area, and excellent conductivity , leading to improve the transmission efficiency of current signals. The 3D-CS/rGO/GCE was used to increase a load of acetamiprid aptamer on the electrode. Meanwhile, DNA self-assembly strategy was used to further increase the DNA amounts. Thus the electrochemical current was amplified significantly due to increased phosphate group amounts by the above synergistic effect . The determination of acetamiprid residues using square wave voltammetry (SWV) showed good sensitivity, with the linear range from 0.1 pM to 0.1 μM and the detection limit was 71.2 fM. The label-free electrochemical aptasensor was also used to detect acetamiprid residues in tea samples with satisfactory results.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Min Zhang,Dongmei Fu
A gas-liquid interface approach was developed for the synthesis of ternary Pd-Au-P composites, which were supported on poly(diallyldimethylammonium chloride)-functionalized reduced graphene oxide (PDDA/RGO). The as-synthesized composites were characterized by transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Pd-Au-P-PDDA/RGO composites as an electrochemical dopamine (DA) sensor showed superior electrocatalytic activity and stability toward DA oxidation as compared with Pd- Au-PDDA/RGO and Pd-Au-P/RGO. The enhanced electrochemical performance could be attributed to the effect of electronic structure and long-range disorder and short-range structure due to the doping of P element. By studying the kinetics of DA oxidation, electrochemical DA oxidation was proven to be irreversible and follow Laviron Equation. Using differential pulse voltammetry (DPV), the Pd-Au- P/PDDA/RGO sensor had low detection limit of 0.7 ^M, wide linear range of 3.5-125 ^M and relatively high sensitivity (0.2858 μA/μM), which was suitable for the detection of biological and environmental samples.
研究领域:
生物医学工程
·
材料科学
·
分析化学
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Haili Gao,Yaqiong Ma,Yunpeng Li,Yang Cao,Zhigang Yin,Hewei Luo,Ji Yan,Yong Zhang
During recent years, increasing demand of new, clean, and renewable energy resources has stimulated wide study on exploitation of non-platinum-group cathode catalysts for oxygen reduction reaction (ORR). Here, a series of nitrogen-doped carbon coated Co nanoparticle supported on reduced graphene oxide (Co@NC/RGO) were prepared by growth of ZIF-67 on GO with subsequent carbonation. The influence of incorporating dose of GO on the catalyst structure and activity was studied. The phase structure, morphology, element distribution, element composition, specific surface area, and pore-size distribution were characterized by various characterization techniques. The highest catalytic performance is achieved when the adding proportion of GO is 2.6% with the onset potential of 0.96 V and half-wave potential of 0.82 V. The introduction of RGO not only improves the electronic conductivity but also accelerates charge transfer. The special porous structure makes it have high specific surface area (313.7 m 2 g −1 ) and large pore size (12.6 nm). The contents of pyridinic-N (53.4%) and graphitic-N (19.3%) in Co@NC/RGO-2.6 are higher than those in Co@NC (50.2% and 10.3%). Co@NC/RGO-2.6 exhibits much higher durability than commercial Pt/C. The ORR mechanism on the home-made catalyst is similar to that on Pt/C.
研究领域:
材料科学
·
能源化学
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高影响因子
危险品化学品经营许可证（带存储）