INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Yuehui Liu,Xiaobo Shi,Xuguang Liu,Xia Li
Nanocomposites of C–Ta 4+ co-doped NaTaO 3 and reduced graphene oxide (C-NTO/rGO) with highly efficient photocatalytic activity were fabricated by a one-step solvothermal reaction. The optimum composites C-NTO/3rGO (with 3 wt% rGO) exhibited superior photocatalytic activity for the degradation of RhB over a mono-component counterpart under visible light irradiation . The photocatalytic efficiency was found to be as high as 97% for 90 min. Both XRD and XPS characterizations indicated that the doping of carbon into the NaTaO 3 lattice leads to the reduction of Ta 5+ to Ta 4+ . Furthermore, the co-doping significantly narrows the band gap (about 2.8 eV). Photo-luminescence (PL), time resolved transient PL decay spectra and photo-current results confirmed that photo-induced hole-electron pairs can be effectively separated resulting from the introduction of rGO. The synergistic effect of a decreased band gap and highly effective separation of photo-generated electrons and holes may be responsible for the enhanced photocatalytic activity of the fabricated nanocomposites. Both h + and •OH active radicals were found to be the key factors for the photo-decomposition process of RhB over the nanocomposites, while •O 2 − was also involved to a smaller extent. A possible photo-degradation mechanism for C-NTO/rGO was proposed on the basis of the experiments results.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Moumita Maiti,Manas Sarkar,Soumen Maiti,Donghong Liu
This work explores noble metal coupled carbon-based nanohybrid materials specifically for their antibacterial and photo-disinfection capabilities from a broader perspective of health to clean. Using gold (Au) nanoparticles (NPs) on the surface of two different shaped zinc oxide-graphene (ZnO-rGO) nanohybrids such as flake and spherical, this experiment aims to manage a pathogen-free environment while filtering and recycling carcinogenic dye-containing wastewater. The shape-tailored ZnO-rGO-Au hybrid generate a substantial amount of reactive oxygen species ; ROSs: hydroxyl radical (•OH), superoxide (•O 2 - ), singlet oxygen, and ( 1 O 2 ) and focal electrostatic interactions on (gram-negative Escherichia coli and gram-positive Staphylococcus aureus ) bacterial cell membranes . Redox cycling and strong potential binding tendency rapture the structural organization of cells that is clearly reflected in growth kinetics, (3(4, 5-dimethylthiazol-2-yl)−2), 5-diphenyl tetrazolium bromide (MTT), inner permeable/ protein/ malondialdehyde assay, and microscopical images after the morphology dependent physical as well as the chemical effects of nanocomposites . The minimum bactericidal concentration (MBC) or minimum inhibitory concentration (MIC) studies show the Au/rGO-ZnO system to be the very potent antibacterial agent , and that only 0.18 mg/ml represents significant bactericidal activity while their toxicity towards mammalian cells is very low (>2 mg/ml). Furthermore, Au NPs alter the bandgap energy of Au/rGO-ZnO hybrids, causing the formation of ROSs at different pH levels or dosages of the catalyst, which results in excellent photocatalytic activity (96% degradation of Rhodamine B when using 0.75 mg catalyst). Based on a Pseudo-first-order kinetic model , a likely mechanistic pathway towards exceptional dye decomposition has also been identified.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Miao Gu,Haolin Xiao,Shanshan Wei,Zhencheng Chen,Liangli Cao
Dopamine (DA) is an important neurotransmitter and one of the biomarkers of psychiatric diseases such as Parkinson's disease and schizophrenia. Therefore, it is urgent to explore an effective method to realize rapid and sensitive detection of DA. In this paper, porous zinc oxide microspheres-functional reduced graphene oxide composites (ZnO-rGO) were successfully prepared by a simple solution method, then gold nanoparticles (AuNPs) were combined by electrodeposition. Zinc oxide porous microspheres-reduced graphene oxide-gold nanoparticles nanocomposites were used to modify the screen-printed electrode (ZnO-rGO-AuNPs@SPE) to fabricate a fast and efficient non-enzymatic electrochemical sensing platform for detecting DA in biological samples. The sensor obtained a good linear range of 0.5 μM to 100 μM and a low detection limit of 0.294 μM at S/N = 3. Additionally, a sensor was applied to the determination of DA in human biological samples, and it showed good stability and reproducibility, making it an excellent candidate material in the field of biosensors.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Samuel Guemou,Liuting Zhang,Shuai Li,Yiqun Jiang,Tao Zhong,Zichuan Lu,Ren Zhou,Fuying Wu,Qian Li
The design of an excellent active catalyst to improve the sluggish kinetic and thermodynamic properties of magnesium hydride (MgH 2 ) remains a great challenge to achieve its practical application. In this study, a novel Ni-Nb/rGO nanocomposite catalyst was successfully prepared by one-spot hydrothermal and subsequent calcination methods. The novel Ni-Nb/rGO nanocomposite exhibits an exceptional catalytic effect on improving MgH 2 sorption properties. Specifically, the onset desorption temperature of MgH 2 + 10 wt% Ni-Nb/rGO composite is reduced to 198 °C, much lower than that of undoped MgH 2 (330 °C). Interestingly, the composite can release 5.0, 5.9, and 6.0 wt% H 2 within 10 min at 245, 260, and 275 °C, respectively. Furthermore, the dehydrogenated MgH 2 + 10 wt% Ni-Nb/rGO composite starts to absorb hydrogen even at room temperature with approximate 2.75 wt% H 2 uptake at 75 °C under 3 MPa H 2 pressure within 30 min and exhibits excellent stability by maintaining 6.0 wt% hydrogen content after 20 cycles at 300 °C. Chou's model suggests that the de/hydrogenation kinetics of Ni-Nb/rGO-modified MgH 2 switches from surface penetration model to diffusion model at lower temperatures. Additionally, the activation energies ( E a ) for the de/hydrogenation of MgH 2 + 10 wt% Ni-Nb/rGO are reduced to 57.8 kJ/mol and 33.9 kJ/mol, which are significantly lower than those of undoped MgH 2 . The work demonstrates that the addition of a novel ternary Ni-Nb/rGO catalyst is an effective strategy to not only boost the sorption kinetics of MgH 2 but also maintain its cycling property.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jingwen Wei,Ting Liang,Shiming Zhang,Jinhang Yang,Zhihong Li,Zuji Li,Songyu Fan,Zebin Yu,Yanping Hou
In this work, the Z-scheme layered double hydroxide (LDH)/reduced graphene oxide (RGO)/indium vanadate (InVO 4 ) heterojunction was synthesized by a simple hydrothermal synthesis. RGO , with excellent electron mobility, endowed rapid charge migration and separation between the CoAl-LDH and InVO 4 . Various characterizations and tests showed that the LDH/RGO/InVO 4 heterojunction exhibited superior optical properties, and its carriers’ transfer pathway conformed to Z-scheme mechanism. Under visible light illumination, CO was observed to be the main product during photocatalytic CO 2 reduction, and the LDH/RGO/InVO 4 -15 exhibited the highest CO yield of 204.86 μmol g −1 within 2 h, approximately 2.62 times of pristine CoAl-LDH (78.2 μmol g −1 ). In addition, LDH/RGO/InVO 4 -15 showed favorable structure stability and performance stability. In situ fourier infrared spectroscopy (ISFT-IR) analysis demonstrated that the predominant intermediates of CO 2 reduction process were carboxylate (COOH*) and bicarbonate (HCO 3 *). Accordingly, possible pathways of CO 2 reduction to CO were deduced. This work can advance the development of efficient Z-scheme heterojunction photocatalysts for CO 2 reduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Jian Wu,Jinlei Meng,Zhanhong Yang,Hongzhe Chen,Yao Rong,Lie Deng,Zhimin Fu
Aqueous zinc-ion batteries (AZIBs) are expected to be used for large-scale energy storage, due to their environmentally friendly, low cost, abundant global stockpile, high capacity. However, the development of high-performance cathodic materials still faces huge challenges. Herein, cuprous oxide (Cu 2 O) and Cu 2 O/reduced graphene oxide (rGO) are first reported as a cathode for AZIBs respectively. Simultaneously, the Zn//Cu 2 O/rGO battery exhibits significantly enhanced electrochemical performance with a high rate performance and an excellent cycle lifespan (139 mAh g −1 after 500 cycles at 1 A g −1 with 95.9% capacity retention), which is extremely excellent in copper-based zinc-ion battery cathode materials . Moreover, ex-situ XRD and XPS results have revealed a hybrid mechanism involving conversion reactions and classical insertion/extraction reaction. when the Zn//Cu 2 O/rGO battery discharged from the initial state to 0.2 V, part of Cu 2 O will be reduced to Cu 0 with the insertion of zinc ions ; when the Zn//Cu 2 O/rGO battery charged to 1.1 V, Cu 0 is completely oxidized to Cu 2 O with the deintercalation of zinc ions, and only Cu + is existing at this time. The results reveal the energy storage mechanism of the Cu 2 O/rGO electrode, which will provide significant help for the research on copper based cathodic materials and expect to be further explored in other ion-batteries.
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ENERGY CONVERSION AND MANAGEMENT
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2021
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IF 9.709
Shengnan Yan,Zhenggui Li,Xiaobing Liu,Fang Chen,Wangxu Li,Jie Cheng
Magnetically driven photothermal conversion and energy storage techniques can enhance the energy storage performance of phase change materials (PCMs) and thus have immense potential in energy applications. Paraffin is a common PCM that melts slowly and has poor rate of heat storage capacity. In this study, the effect of a controllable magnetic field on the photothermal and heat storage properties of paraffin was investigated. First, a reduced-graphene-oxide/nickel foam (rGO@Ni foam) composite film with good photothermal ability, corrosion resistance, and oxidation resistance was prepared, and photothermal conversion and energy storage processes under different magnetic fields were experimentally studied. The movement of the composite film could be adjusted by the action of magnetic force, especially to enhance the phase interface movement, accelerate paraffin melting, and improve the photothermal capacity and heat storage characteristics of the material. The composite film and phase interface could be dynamically tuned by regulating the magnetic field, thus enhancing the photothermal conversion effect. In particular, with increasing magnetic field strength, the thermal energy storage efficiency and speed of phase interface movement increased by 29% and 50%, respectively. The proposed magnetic force-driven method will enhance solar energy conversion and promote direct solar energy applications.
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SURFACE & COATINGS TECHNOLOGY
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2021
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IF 4.158
Dandan Li,Han Peng,Zaiwen Lin,Jiahui Zhu,Jing Yu,Jingyuan Liu,Rongrong Chen,Qi Liu,Jun Wang
Taking advantage of the excellent barrier properties of reduced graphene oxide (rGO) sheets and the loading capacity of mesoporous silica (SiO 2 ), silane-functionalized rGO/SiO 2 nanocontainers are synthesized and, after loaded with benzotriazole (BTA), composite corrosion protection coatings are prepared. The XRD , FTIR, XPS , SEM , and TEM are used to confirm the successful preparation of silane-functionalized rGO/SiO 2 nanocontainers, and BET and UV–visible measurements are used to estimate the loading and release behavior of BTA. Dispersion stability of the nanocontainers is observed, the surface morphology , wettability , and water absorption of coatings are characterized by SEM, water contact angle, and weight method, respectively. The corrosion behavior of pristine and scratched composite coatings is characterized by EIS , the effect of released BTA is further confirmed. The results show that silane-functionalized rGO/SiO 2 nanocontainers possess excellent dispersibility and load capacity, reduce defects and micropores in composite coatings, and provide improved permeability resistance, corrosion resistance , and self-repairing performance.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Huayu Wu,Rongguan Lv,Rui Wang,Zhiyuan Zhao,Yuzhen Sun,Yu Liu,Yingna Chang,Jindi Wang,Kefan Song,Ming Chen,Rong Xing
3D Porous MnO x /rGO hydrogel (3DP MnO x /rGO hydrogel) as cathode material for aqueous zinc ion batteries (AZIBs) is synthesized by polyvinyl alcohol (PVA), nanowires of MnO x (NW MnO x ) and reduced graphene oxide (rGO) via repeated freeze-thaw method, which has a high flexibility and puncture resistance. The 3D self-supporting hydrogel presented complex 3D cross-linking system and excellent flexibility through hydrogen bonding and reinforcement of inorganic nano wires. The electrochemical and mechanical properties of the 3DP MnO x /rGO hydrogel are optimized by adjusting the respective percentages of NW MnO x (30%), rGO (5%), PVA (25%), and H 2 O (40%) in the total mass. The flexible hydrogel cathode exhibits a high capacity of 297.6 mA h g −1 and good cyclic stability after 500 cycles at 1 A g −1 . Finite element method confirms that the hydrogel material can alleviate the stress distribution caused by zincification process. The soft-packaged AZIBs, which utilize 3DP MnO x /rGO hydrogel as the cathode and Zn foil as the anode, exhibit excellent cycling performance (152.2 mA h g −1 at 1 A g −1 after 500 cycles under an angle of 180°) and provide a stable power supply across different bending angles.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Honglu Wu,Zenghui Qiu
Fe 3 O 4 particles are designed to originate reversible faradaic process and carbon material with a rice-like shape and meso-pore dominated structure is designed to encapsulate the Fe 3 O 4 particles. Synthesized carbon nano rice wrapped Fe 3 O 4 are uniformly anchored on the surface of reduced graphene oxide (rGO) nano sheets in a one-pot facile hydrothermal procedure. A significant amount (13.28 at%) of N is also doped into the carbon nano rice in the hydrothermal process, simultaneously. The synthesized Fe 3 O 4 @N-Carbon nano rice/rGO (Fe 3 O 4 @N-PCNR/rGO) delivers a high capacity of 495 Cg -1 at a current density of 1 Ag -1 and high long-term stability of 70% after 1000 charge-discharge cycles at 10 Ag -1 . The Fe 3 O 4 @N-Carbon/rGO is utilized as a positive electrode, and synthesized 3D rGO aerogel is employed as a negative electrode to fabricate a supercapattery, which exhibits a wide operating potential window of 1.5 V, a high energy density of 46 W h kg -1 at 750 W kg -1 , and even 10 W h kg -1 at an elevated power density of 7500 W kg -1 . The supercapattery also performs well in terms of long-life stability with 80% of capacitance retention after 10,000 charge-discharge cycles at 10 Ag -1 .
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高影响因子
APPLIED CLAY SCIENCE
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2021
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IF 5.467
Yuchuan Liu,Zongxue Yu,Qiuxiang Wang,Ximei Zhu,Runxuan Long,Xuyang Li
Layered double hydroxides (LDHs) is a typical type of anionic clay minerals. In this study, an SDS-LDH with sodium dodecyl sulfate (SDS) intercalation was prepared by the ion exchange method, and the modified SDS-LDH was successfully combined with graphene oxide (GO). In the presence of dopamine, partial reduction of GO to reduced graphene oxide (RGO). RGO/PDA/SDS-LDH (RPS) composite material was prepared successfully and used in the field of membrane separation . The RPS-2 composite membrane combines the advantages of GO and SDS-LDH, which can increase GO flux while maintaining a high rejection rate. The flux was increased from 10.21 L·m −2 h −1 bar −1 of GO to 79.24 L·m −2 h −1 bar −1 of RPS-2, and the rejection rate of various dyes was above 97%. The rejection rate of methylene blue (MB) 97.34% was maintained after 10 cycles, and its flux loss rate is only 45.32%. The composite membrane had good stability under different pH conditions , which provides a basis for the practical application of the membrane.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Lingjie Li,Zhonghao Ning,Wenyan Huang,Liang Liao,Yinong Zheng,Kun Zhuang,Siqi Lan,Yinggan Zhang,Rongqian Yao
An ingenious strategy to prepare in-situ formed SiC(Al, rGO) bulk polymer-derived ceramics (PDCs) from re-pyrolyzing SiC(Al, rGO) p /polyaluminocarbosilane-vinyltriethoxysilane-graphene oxide (PACS-VTES-GO, PAVG) blends is highlighted. Flexible PAVG modified by Al with highly cross-linked structure effectively improves molecular weight and formability of precursors. Rigid SiC(Al, rGO) p fillers provide high mechanical properties owing to their unique microstructure which is consistent with SiC(Al, rGO) bulk PDCs. β-SiC nanocrystals are well dispersed in amorphous SiO x C y /C free , and rGO exhibits good compatibility with SiO x C y /C free . Besides, possible Al 2 O 3 is beneficial to relaxing thermal stress at β-SiC nanocrystalline boundaries. Interestingly, introduction of Al could avoid coarsening of β-SiC grains to enhance elevated temperature resistance. Furthermore, effect of re-pyrolysis temperature on the formation and microstructure of SiC(Al, rGO) bulk PDCs was also investigated. Particularly, lightweight samples re-pyrolyzed at 1300 °C display optimal fracture toughness (3.32 MPa m 1/2 ), compressive strength (177.16 MPa) and flexural strength (51.25 MPa), high ceramic yield (94.46%) and low linear shrinkage (4.38%), by far superior to those of most PDCs. As treated via precursor infiltration and pyrolysis (PIP) route and heated by butane gun flame in air, such products possess stable structures under elevated temperatures and have potential emerging uses in aerospace components.
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高影响因子
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