JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 12
·6696-6708
·
IF 3.784
Huaiyang Chen,Xiaoping Shen,Keqiang Xu,Yao Chen,Aihua Yuan,Zhenyuan Ji,Zhitao Wang,Guoxing Zhu
Binary transition-metal oxides with spinel structure have great potential as advanced anode materials for lithium-ion batteries (LIBs). Herein, NiFe-NiFe 2 O 4 / reduced graphene oxide (rGO) composites are obtained via a facile cyanometallic framework precursor strategy to improve the lithium storage performance of NiFe 2 O 4 . In the composites, NiFe-NiFe 2 O 4 nanoparticles with adjustable mass ratios of NiFe 2 O 4 to NiFe alloy are homogeneously deposited on rGO sheets. As anode material for LIBs, the optimized NiFe-NiFe 2 O 4 /rGO composite displays remarkably enhanced lithium storage performance with an initial specific capacity as high as 1362 mAh g −1 at 0.1 A g −1 and a decent capacity retention of ca . 80% after 130 cycles. Besides, the composite delivers a reversible capacity of 550 mAh g −1 at 1 A g −1 after 300 cycles. During the charge–discharge cycles, the aggregation of the NiFe-NiFe 2 O 4 nanoparticles and the structural collapse of the electrode can be well alleviated by rGO sheets. Moreover, the conductivity of the electrode can be significantly improved by the well-conductive NiFe alloy and rGO sheets. All these contribute to the improved lithium storage performance of NiFe-NiFe 2 O 4 /rGO composites.
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ChemCatChem
·
2020
·Vol. 12
·期 14
·3769-3775
·
IF 4.853
Guihua Zeng,Liqiong Hou,Jialing Zhang,Jiaqian Zhu,Xiang Yu,Xionghui Fu,Yi Zhu,Yuanming Zhang
Graphical PEC water splitting : A novel FeOOH/rGO/BiVO 4 photoanode was prepared for the first time with excellent PEC performance in which rGO as a hole-transporting layer significantly enhanced carrier separation efficiencies and FeOOH greatly accelerated the water oxidation kinetics. Bismuth vanadate (BiVO 4 ) is regarded as a potential material in photoelectrochemical (PEC) water splitting, but the photocurrent of BiVO 4 photoanode is much lower than its theoretical value for the high recombination of photo-induced charges and slow water oxidation kinetics. Here, we constructed a FeOOH/rGO/BiVO 4 photoanode, in which rGO could enhance the photogenerated electron-hole separation efficiency by transporting holes and the FeOOH could greatly accelerate the water oxidation kinetics. This novel photoanode displayed excellent PEC performance with the photocurrent density of 3.25 mA cm −2 at 1.23 V vs. RHE, 3.28 times higher than BiVO 4 photoanode (0.99 mA cm −2 ), and long-term stability with the Faraday efficiency of ∼98 % for 3 hours, demonstrating its great potential for PEC water splitting. The photoanode also provided a novel insight into the role of rGO to transport holes rather than electrons in improving the carrier separation efficiency.
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JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 37
·期 1
·294-303
·
IF 3.089
Chang Chao,Liu Min,Li Lanxin,Chen Guowei,Pei Lilin,Wang Zongyu,Ji Yulong
Abstract Solar-driven interfacial desalination has been emerged as a promising water treatment technology to generate drinkable water out of seawater. The accumulated salt crystals generated from seawater, however, have adverse effects on solar-driven interfacial evaporation. In this work, we prepared a salt-rejecting reduced graphene oxide (rGO) foam by depositing rGO particles on a hydrophilic melamine foam for solar desalination. Benefitting from the intrinsic porous microstructure and hydrophilicity, the rGO-coated melamine foam has sufficient wettability to draw water to the evaporation region, leading to rapid replenishment of water and simultaneously avoiding salt precipitation. Based on the rGO-coated melamine foam, the interfacial evaporation system can achieve a steady-state evaporation efficiency of 89.6% under a solar flux of 1 kW m −2 and has good durability under one sun over 12 h. With the high solar-to-thermal conversion efficiency and excellent long-term stability, this interfacial evaporation system exhibits the potential of commercial seawater desalination. Graphic abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Pulin Hao,Mingzhu Hu,Rong Xing,Wenjun Zhou
Methylparaben (MeP), as emerging contaminants widely used in pharmaceuticals and personal care products , have potential endocrine disrupting effect. In this study, the copper ferrite (CuFe 2 O 4 ) nanoparticles were uniformly distributed on graphene oxide (GO), and the performance and mechanism of CuFe 2 O 4 -rGO composites in activating persulfate (PS) for MeP degradation were comprehensively investigated. Results showed that the CuFe 2 O 4 -rGO composites exhibited much better efficiency for MeP degradation than CuFe 2 O 4 , and the synergistic effect between CuFe 2 O 4 and GO in CuFe 2 O 4 -rGO composite was also observed. The best catalytic performance of CuFe 2 O 4 -rGO composites was obtained at the mass ratio of 4:1 for CuFe 2 O 4 to GO and at neutral pH. X-ray photoelectron spectroscopy (XPS) results suggested that graphene in the composites mainly served as an electron shuttle to mediate electron transfer reactions. Electron paramagnetic resonance (EPR) and the quenching experiments further revealed that both hydroxyl and sulfate radicals were the major reactive species, and non-radical process also occurred during the reaction. Meanwhile, the degradation pathways of MeP involving hydroxylation, decarbonylation and ring opening were rationally proposed based on computational method and intermediates identification. All these results could provide insight into persulfate activation by CuFe 2 O 4 -rGO nanocomposites in environmental control applications.
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Polymers
·
2019
·Vol. 11
·期 3
·532
·
IF 3.164
Fubin Luo,Pinping Yan,Qingrong Qian,Hongzhou Li,Baoquan Huang,Qinghua Chen
In this paper, high thermal conductive polyethylene oxide (PEO)/reduced graphene oxide (rGO) composite is prepared via large-scale green reduction. Flexible layered PEO/GO composites are pre-prepared in aqueous solution. It is demonstrated that PEO chains can form hydrogen bonds with GO. Being driven by hydrogen bonds, GO/PEO composites show homogeneous and lateral highly oriented structures, resulting in excellent mechanical properties. The pre-prepared composite films are large scale soaked into ascorbic acid solution. GO nanosheets in the matrix of the composites can be reduced by ascorbic acid. The results indicate that PEO chains can repair the damage of the films caused by the reduction process. Therefore, the films can maintain their original configuration and still keep excellent flexibility. By comparison, pristine GO films are totally destroyed when the same reduction is experienced. Due to the presence of PEO, the lateral highly oriented structure of the composite will not be damaged. After reduction, the thermal conductivity of the composite reaches to 12.03 W m−1K−1along the rGO nanosheet oriented direction.Keywords:thermal conductivity;graphene;polyethylene oxide
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guanshu Zhao,Jing Ding,Fanyang Zhou,Qingliang Zhao,Kun Wang,Xueqi Chen,Qingwei Gao
A novel W doped BiVO 4 with rich oxygen vacancies (OVs) oriented on reduced graphene oxide (rGO) photocatalyst (W-BiVO 4-x /rGO) was developed by a simple one-step microwave hydrothermal method for efficient removal of ciprofloxacin (CIP) and chlortetracycline (CTC) under visible light. The synergistic effect of W doping, BiVO 4 with OVs, and rGO on the enhancement of photocatalytic activity was clarified from experimental and Density Functional Theory (DFT) calculations results. W doping significantly improved the density of photo-generated charge carriers. The introduction of rGO enlarged the specific surface area, expanded the light absorption range, and promoted the charge transfer of BiVO 4 . OVs both narrowed the band gap and enhanced the generation of O 2 − . W doping and OVs both enhanced the interactions between BiVO 4 and rGO. The CIP degradation rate constant of W-BiVO 4-x /rGO photocatalyst was 1.73, 5.32, 6.43, and 10.70 times higher than those of W-BiVO 4 /rGO, BiVO 4 /rGO, W-BiVO 4 , and BiVO 4 , respectively. Besides, W-BiVO 4-x /rGO photocatalyst prepared by microwave hydrothermal method exhibited higher photocatalytic activity and better combination between materials. This study offers a new strategy to address the problem of antibiotic residues in wastewater.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yuefeng Gu,Zhenghao Zhang,Feifan Fan,Lisi Wei,Tiancheng Wu,Dakai Wang,Qiuhong Li
Flexible, breathable, and stable sensors were important in developing human–computer interaction systems and novel wearable devices. However, major challenges were still faced in two aspects, 1) high-performance strain sensors with a large sensing range, and 2) an interaction mode that is both convenient and efficient. Herein, we developed a thermoplastic polyurethane large-skeleton foam (TPU-LS foam) through a steam-induced method. The strain sensor comprised three layers of breathable foam, with CNTs/rGO TPU-LS foam as the inner layer and pure foam as the protective layer. PDMS/TiO 2 was sprayed to create a UV-resistant and self-repairing coating, achieving a 66% melanin inhibition rate and a 91% repair rate. The sensor presented a wide work range over 100%, a high gauge factor of 637.8, and long-term durability. We trained machine learning frameworks to recognize different gestures and designed two types of human–computer interaction applications, allowing users to operate apps with gestures.
研究领域:
材料科学
·
电子工程
·
人工智能
·
生物医学工程
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Wu Dan,Liu Yixin,Wang Yaoguang,Hu Lihua,Ma Hongmin,Wang Guoqin,Wei Qin
Prostate-specific antigen (PSA) was used as the model, an ultrasensitive label-free electrochemiluminescent immunosensor was developed based on graphene quantum dots. Au/Ag-rGO was sythsized and used as electrode material to load a great deal of graphene quantum dots due to the large surface area and excellent electron conductivity. After aminated graphene quantum dots and acarboxyl graphene quantum dots were modified onto the electrode, the ECL intensity was much high using K 2 S 2 O 8 as coreactant. Then, antibody of PSA was immobilized on the surface of modified electrode surface through the adsorption of Au/Ag toward proteins, leading to the decrease of the ECL intensity. As proven by ECL spectra test and electrochemical impedance spectroscopy (EIS) analysis, the fabrication process of the immunosensor is successful. Under the optimal conditions, the ECL intensity decreased linearly with the logarithm of PSA concentration in the range of 1 pg/mL ~ 10 ng/mL. The detection limit achieved is 0.29 pg/mL. The immunosensor results were validated through the detection of PSA in serum samples with satisfactory results. Due to excellent stability, high sensitivity, acceptable repeatability and selectivity, the immunosensor has promising applications in disease and drug analysis.
研究领域:
生物医学工程
·
分析化学
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Desalination and Water Treatment
·
2024
·
IF 1
Shuohua Zhou,Weiming Xiang,Qiang Zhong,Shaogui Yang,Gancheng Zuo,Zhe Xu,Qiuyi Ji,Jijie Kong,Chenmin Xu,Bing Yang,Dunyu Sun,Yinhao Dai,Yazi Liu,Huan He,Shiyin Li
Sulphate radical (SO 4 · - ) -based advanced oxidation process (SR-AOP) is a promising sewage treatment technology. Reduced graphene oxide (rGO) supported Co 3 O 4 composites were synthesized by a hydrothermal method for the degradation of iohexol (IOH) in the rGO/Co 3 O 4 /peroxymonosulfate (PMS) system. Experimental results show that rGO/Co 3 O 4 possessed much better PMS activated ability than pure GO or Co 3 O 4 , which is ascribed to the summation of rGO and Co 3 O 4 . The efficiency of rGO/Co 3 O 4 composite, single GO and Co 3 O 4 nanocrystals for the degradation of IOH were 98.7%, 15.8% and 79.8% at 15 min, and their corresponding reaction rate constants ( k app ) were 0.21 min −1 , 0.0077 min −1 and 0.080 min −1 , respectively. The results of active species capture experiment and electron paramagnetic resonance (EPR) experiment, showed that singlet oxygen is the main active species, which is non-radical degradation. rGO is conducive to the electron conduction of Co 3 O 4 , thus improving the efficiency of PMS activation. The system is simple and efficient, which is an effective technology to remove IOH.
研究领域:
环境科学
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化学工程
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 7
·072501
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IF 3.1
Hui-Ting Hu,Jiang-Tao Xu,Bing-Lun Li,Guo-Cheng Han,Xiao-Zhen Feng,Heinz-Bernhard Kraatz
Naringenin (NRG), a flavanone compound present in citrus fruits, has a variety of beneficial physiological active functions such as antioxidant, anti-inflammatory, and hypoglycaemic. In this study, an sensor was constructed by electrodeposition and used for the electrochemical study of NRG. Reduced graphene oxide (rGO) and glutathione (GSH) showed the ability to synergistically amplify NRG signals and possessed good linearity in the concentration range of 10.00–1200.00 μmol l−1. The linear equation is Ip = 0.0776logc + 0.9353 (R2 = 0.9901), and the limit of detection is 3.33 μmol l−1. The sensor performed well in terms of reproducibility, stability, and selectivity, which in turn enabled the detection of NRG in tomatoes. The average recovery of the sensor is 95.68% to 111.92%, with RSD less than 11.89%. The results were also verified by Ultraviolet–visible spectroscopy(UV-vis). Furthermore, density-functional theory was employed to analyse the front track of the NRG, speculating that the NRG underwent a transfer of two electrons and two protons.
研究领域:
生物化学
·
分析化学
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高影响因子
CARBON
·
2024
·
IF 10.5
Le Li,Yawen Zhang,Chengyi Si,Cong Cai,Hongyu Liu,Xiaoqiang Fan,Minhao Zhu
Two-dimensional materials, such as Ti 3 C 2 T x and graphene oxide (GO), are considered candidates for a new generation of lubricating materials due to their unique physical and chemical properties. However, the dispersion stability of Ti 3 C 2 T x and GO in non-polar oils is insufficient, hindering their potential as lubricating additives. Herein, 1,12-Dodecanediamine (DDM) was used as a bridge to connect Ti3C2Tx and GO, and to reduce graphene oxide (rGO) for forming the stacked two-dimensional multilayer Ti3C2Tx/rGO heterostructures . The multilayer Ti 3 C 2 T x /rGO heterostructure exhibits excellent dispersion stability in PAO 20, ensuring its continuous integration into the tribo-interfaces throughout the friction process. The addition of 0.06 wt% multilayer Ti 3 C 2 T x /rGO to the base oil reduced the average friction coefficient and wear volume by 35.3% and 41.6%. The enhanced lubrication performance is mainly due to the unique multilayer heterostructure of Ti 3 C 2 T x /rGO. During friction, the disintegration of Ti 3 C 2 T x into small fragments effectively safeguards the structural integrity of rGO, thereby facilitating the formation of a robust and smooth multilayer lubrication film. Additionally, Ti3C2Tx is adhered to the wear surface in smaller sizes or evolved into the form of Ti oxides. The emergence of this new composite material is not only expected to solve the problem of insufficient performance of traditional lubricating materials under extreme conditions, but also laid the foundation for expanding the application of two-dimensional materials in the field of lubrication.
研究领域:
材料科学
·
摩擦学
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高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 20
·3699
·
IF 5.719
Congyi Qian,Xiaohui Liang,Mei Wu,Xingxin Zhang
A lightweight microwave-absorbing material with a strong electromagnetic-absorption capability of practical significance in the field of electromagnetic compatibility was obtained by adjusting the ratio of Fe3O4and rGO. A nanoparticle material with a chain-typed structure consisting of a combination of Fe3O4and rGO was produced by a hydrothermal method under an applied magnetic field. The electromagnetic loss property of the Fe3O4@rGO composites is studied in the frequency range from 2 to 18 GHz. In addition, the reflection loss and the mechanism of microwave absorption are explored. By changing the amounts of rGO, the electromagnetic loss of the Fe3O4@rGO composites can be effectively regulated, which obtain better reflection loss. The minimum reflection loss of the Fe3O4@rGO composites is −49.4 dB at 16.2 GHz only with a thickness of 1.75 mm. Thus, the Fe3O4@rGO composites have an extremely thin thickness and a strong electromagnetic wave absorption capacity, which is a candidate for the development of lightweight magnetic absorbing materials.Keywords:magnetic composites;microwave absorption;electromagnetic loss;lightweight
研究领域:
材料科学
·
电磁学
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高影响因子
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