COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
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IF 8.7
Junyu Lu,Haoruo Zhang,Mushan Yuan,Yunfei Gao,Mei Liang,Yang Chen,Huawei Zou
Without a reliable mechanical carrier, it is difficult to apply MA materials in realistic aerospace scenarios. Here, the broadband MA properties of RGO/melamine foam (RGO/MF) composites were prepared and optimized by hydrothermal chemical reduction method. The realization of broadband MA by RGO/MF is mainly achieved through the cooperative enhancement of RGO dispersion by the following two points: (1) three-dimensional (3D) meso -scale dispersion of RGO supplied by MF and (2) 3D microlayer separation of formed RGO provided by hydrothermal chemical reduction. For the first time, we successfully achieve complete filling of the RGO/MF into honeycomb. The RGO/MF honeycomb composites achieved almost 95.25 % EAB in the full frequency ranges from 2 to 18 GHz, where the MA performance of the composites originated from the electric-field loss of the RGO/MFs. Such RGO/MF honeycomb composites shows a promising application prospect and guidance in the field of aerospace stealth.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Wenxing Luo,MinMing Zou,Lixiang Luo,Wenjing Chen,Xiaowu Hu,Yan Ma,Qinglin Li,Xiongxin Jiang
In the field of thermal energy storage, organic phase change materials (PCMs) are widely used as functional materials to boost thermal applications. However, there is often a tradeoff between constructing shape-stable composite PCMs with high enthalpy value and those with low leakage rates. Here, we proposed a promising scheme to address this issue. A novel hydrogel consisting of reduced graphene oxide (rGO) and covalent organic framework (COF) was prepared via hydrothermal methods, and the rGO–COF ultralight aerogel with a hierarchical porous structure was formed after freeze-drying. The rGO–COF aerogel shows excellent absorption ability and affinity for organic solvents. It can sufficiently adsorb the molten organic PCMs, such as polyethylene glycol (PEG), and synthesize shape-stable composite PCMs with excellent leak resistance. The COF grown on the surface of rGO has a superior affinity for PEG, so rGO–COF aerogel shows an outstanding PEG loading rate of up to 96.1 wt %, which is 1.7 wt % higher than that of rGO aerogel. In addition, the COF effectively reduces the subcooling of PEG/rGO–COF with 20.3%, compared to PEG/rGO. Meanwhile, the prepared PEG/rGO–COF exhibits extremely high enthalpy and relative enthalpy efficiency (164.6 J/g, 97.4%). This demonstrates that a promising direction was highlighte for the preparation of high-enthalpy shape-stable composite organic PCMs in this work.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Qing Xu,Linlin Zang,Ziying Li,Fengtong Shen,Yanhong Zhang,Liguo Sun
As a new generation of non-precious metal catalysts , nickel phosphide is regarded as an ideal substitute for precious metal platinum in electrochemical hydrogen evolution . Here, a hydrogen evolution reaction (HER) electrocatalyst is developed by in situ growth of Ni 2 P/Ni 5 P 4 heterostructures on porous N decorated rGO foam (named Ni 2 P/Ni 5 P 4 /N-rGO). The porous rGO foam structure provides a larger surface area and abundant active sites. The Ni 2 P/Ni 5 P 4 nanoparticles with heterostructures are uniformly distributed on the rGO sheet, which enhance the charge transfer ability. The decorating of N element also correspondingly improves the HER performance. The as-prepared Ni 2 P/Ni 5 P 4 /N-rGO exhibits excellent HER performance in alkaline medium . When the current density is 10 mA cm −2 , the overpotential is only 22 mV. No obvious loss of HER activity after 2000 cyclic voltammetry indicates that the composite has excellent stability. This work presents a valuable route for fabricating inexpensive and high-performance catalysts for electrocatalysis .
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Xun Fan,Qiang Gao,Yu Zhang,Jianbin Qin,Yongsheng Zhao,Xuetao Shi,Guangcheng Zhang
Carbon aerogel shows great potential in electromagnetic interference shielding (EMI) application and is generally strengthened by epoxy impregnation for harsh working environment. However, it is still challenging to simultaneously achieve high mechanical robustness and EMI performance, especially taking low-cost and light-weight feature into account. In this work, a “gelation-press drying-impregnation & micro-foaming” method was systematically reported to target microcellular epoxy foam containing hybrid reduced graphene oxide (rGO)/short-carbon-fiber (SCF) aerogel . Herein, aerogel morphology was transformed from isotropic honey-comb structure into anisotropic corrugated structure by controllable press air-drying. A further supercritical carbon dioxide (scCO 2 ) foaming process was implemented for density reduction. Moreover, the anisotropic microcellular epoxy(m-EP)/rGO-SCF foam (D = ∼0.48 μm, N f = 5.02 × 10 12 cell/cm 3 ) shows low density (1.14 g/cm 3 ), high electrical conductivity (2365.0 S/m), enhanced compressibility (σ b = 243.0 MPa, ε b = ∼45%) and outstanding EMI shielding effectiveness (95.5 dB) with a low thickness (2.0 mm) within X band (8.2–12.4 GHz). Therefore, our work provides a universal step-by-step and industrial-friendly approach to fabricate light-weight carbon-aerogel-based foams with anisotropic carbon structure and outstanding EMI performance.
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PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Kaiming Yang,Junshan Yuan,Yuanbo Zhang,Rui Liu,Weixu Feng,Gaofeng Shang,Hongxia Yan
The weak adhesion and tribological properties of polyimide (PI) restrict its practical application as bonded solid lubricating coatings in high-tech fields. Herein, a novel PI bonded solid lubricating coating was prepared using hyperbranched polysiloxane containing Si-O-C chain segments (HBPSi) and MoS 2 /reduced graphene oxide (rGO) heterostructured particles. Surprisingly, the adhesion, average coefficient of friction, wear life and load carrying capacity of the PI bonded solid lubricating coating can achieve level 1, 0.03, 550 s and 3400 N, respectively. In particular, the average coefficient of friction in the stabilization stage is reduced by 91.4 % compared to the pure PI coating, which is superior to that of most reported polyimide coatings. This is attributed to the synergistic enhancement effect of “soft-hard” particles between HBPSi and MoS 2 /rGO heterostructured particles. Furthermore, this work provides an important direction for the design and preparation of high-performance bonded solid lubricating coatings.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Chenyuan Zhao,Yuxiang Zhou,Tianyu Shi,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Although lithium sulfur batteries (LSBs) have high theoretical capacity and energy density , low conductivity of sulfur and the discharge species (Li 2 S 2 , Li 2 S), the polysulfide shuttle and the large volume change hinder the commercialization of LSBs. To tackle the problem, we hydrothermally prepared a special cocklebur-like ZnSe-VO 2 @rGO nanostructure , in which graphene oxide (GO) is active in inducing thorn-like VO 2 nanorods grown on carambola-like VO 2 nanostructures. In this structure, the polar VO 2 and ZnSe quantum dots (QDs) have strong chemical adsorption that can catalyze the polysulfide conversion and alleviate the shuttle effect; besides, the thorn-like VO 2 nanorods act like numerous tentacles that capture polysulfides by increasing the contact area, and the reduced graphene oxide (rGO) nanosheets not only buffer the volume change, but also enhance the conductivity of the framework and improve the ion and electron transfer . Boosted by the synergetic effects of VO 2 , rGO and ZnSe QDs, the ZnSe-VO 2 @rGO/S cathode achieves a high specific capacity of 1026.1 mA h g −1 at 0.2 C and 712.3 mA h g −1 at 2 C. Good cyclic stability was obtained as well, with a high reversible capacity of 820 mA h g −1 and high retention of 89.1 % after cycling at 0.5 C for 150 cycles. Such outstanding performance indicated its good potential for use in advanced LSBs.
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Journal of Industrial Textiles
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2022
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IF 2.926
Xinghua Hong,Wei Sun,Tao Peng,Junnan Qian,Zhaofa Zhang,Chengyan Zhu,Guangmin Cai
Herein, a MnFe2O4/RGO knitted fabric derived from manganese waste was constructed by a simple in-situ assembled coating method, involving the incorporation of Graphene Oxide (GO) and manganese ferrite nanoparticles on polyester fabric, followed reducing by hydrazine hydrate. The reuse of manganese waste from the preparation of GO can reduce chemical waste emissions and endow the absorption performance. The coated particles possess certain magnetism can be attracted and securely collected in seconds, which is convenient for recycling. This fabric gives well microwave absorption with the maximum reflection loss (RL) of −58.6 dB at 9.1 GHz by a thickness of 1.9 mm. In addition, this fabric presents high stable strain sensing under 1000 stretching and bending cycles. Meanwhile, the resistance-deformation-velocity relationship is provided based on the structure, for the analysis of electromechanical behaviors. Moreover, the fabric has the capability for temperature sensing (TCR=−0.738%/°C), and fire alarm. As such, this fabric can be promising alternatives for a wide application on motion and temperature sensing, microwave blocking.
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Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Song Cheng,Yutao Liu,Chen Shen,Bicun Jiang,Fuqiang Liu,Aimin Li
As a promising advanced oxidation process , electro-Fenton (EF) technology could in-situ generate H 2 O 2 through 2e - oxygen reduction reaction (ORR), and then activate H 2 O 2 into reactive oxygen species to degrade the organic pollutants in wastewater. However, its practical application is limited by the sluggish ORR kinetics and acidic condition (pH < 3), which requires external addition of acids, ferrous salts (Fe II ) or even H 2 O 2 . To improve the efficiency of wastewater treatment , targeted development on EF technology based on specific application scenario is also critical. In this contribution, a flow through EF system was developed to remove the antibiotic pollutants in the meat processing wastewater, where the EF process was significantly enhanced by the reduced graphene oxides (rGO) aerogel cathode and the presence of polyphosphates (PPs). The interconnected 3D porous configuration of rGO aerogel with abundant oxygen functional groups greatly facilitated the mass and electron transfer during the flow-through EF process. Meanwhile, the formation of PPs film on the surface of sacrificial iron anode ensured continuous releasing of Fe II under near-neutral condition without rusting, and the generation of Fe II -PPs complexes effectively compensated the production of H 2 O 2 via the pathway of molecular oxygen activation. Moreover, 99.9% of phosphorus can be recycled and reused in the flow-through EF system by coupling the nanofiltration technology, enabling efficient removal of antibiotics and utilization of PPs in the wastewater.
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Biosensors-Basel
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2022
·Vol. 12
·期 10
·904
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IF 5.743
Rongfang Chen,Xia Peng,Yonghai Song,Yan Du
Herein, a paper-based electrochemical sensor based on PtNP/COFTFPB−DHzDS@rGO was developed for the sensitive detection of furazolidone. A cluster-like covalent organic framework (COFTFPB−DHzDS) was successfully grown on the surface of amino-functional reduced graphene oxide (rGO-NH2) to avoid serious self-aggregation, which was further loaded with platinum nanoparticles (PtNPs) with high catalytic activity as nanozyme to obtain PtNP/COFTFPB−DHzDS@rGO nanocomposites. The morphology of PtNP/COFTFPB−DHzDS@rGO nanocomposites was characterized, and the results showed that the smooth rGO surface became extremely rough after the modification of COFTFPB−DHzDS. Meanwhile, ultra-small PtNPs with sizes of around 1 nm were precisely anchored on COFTFPB−DHzDSto maintain their excellent catalytic activity. The conventional electrodes were used to detect furazolidone and showed a detection limit as low as 5 nM and a linear range from 15 nM to 110 μM. In contrast, the detection limit for the paper-based electrode was 0.23 μM, and the linear range was 0.69–110 μM. The results showed that the paper-based electrode can be used to detect furazolidone. This sensor is a potential candidate for the detection of furazolidone residue in human serum and fish samples.Keywords:paper-based electrode;reduced graphene oxide;covalent organic framework;furazolidone;electrochemical sensor
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Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Jingzhen Wang,Linlin Zang,Libin Wang,Yutong Tian,Zhiyu Yang,Yumei Yue,Liguo Sun
Photocatalytic degradation is an effective technique for removing antibiotics from contaminated water . The kernel of photocatalytic degradation lies in the design and preparation of high-performance and recyclable catalysts. Herein, magnetic porous cobalt ferrite/reduced graphene oxide (CF/rGO) balls were prepared by calcination of spherical composites obtained via modified microfluidic method for effective photocatalytic degradation of oxytetracycline (OTC). The strong interfacial interaction between rGO and cobalt ferrite nanoparticles in porous balls enhanced electron transfer , charge separation and light absorption . Porous spherical structure was favorable for light harvesting. The catalyst could rapidly and efficiently absorb OTC. These characteristics were beneficial to the enhancement of photocatalytic efficiency. The optimized sample (CF/rGO-0.2) exhibited an excellent apparent rate constant (0.0410 min −1 ) for OTC degradation under visible light irradiation, which was 3.73 times that of CF/rGO-0 (0.0110 min −1 ). CF/rGO-0.2 had excellent stability in cycle experiments and could be quickly recovered by magnets. The trapping experiments showed that hole (h + ) and superoxide radicals (·O 2 - ) acted an extremely important role in degradation of OTC, thus suggesting a possible photocatalytic reaction mechanism. This work provides a potential photocatalyst for antibiotic removal from water.
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MICROCHEMICAL JOURNAL
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2022
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IF 5.304
Li Feng,Miaomiao Zou,Xinrong Lv,Xiaoqin Min,Xiaoyun Lin,Yongnian Ni
A novel non-enzymatic electrochemical sensing platform for nitrite, composed of Co-based porous metal organic frameworks (ZIF-67), reduced graphene oxide (RGO), and nickel nanoparticles (NiNPs), was developed. The prepared ZIF-67, RGO and ZIF-67C@RGO were characterized using scanning electron microscopy (SEM) and powder X-ray diffraction (XRD). The fabricated nitrite sensor, ZIF-67C@RGO/NiNPs/GCE, exhibits a higher catalytic current intensity than that of NiNPs/GCE, ZIF-67C/GCE, ZIF-67C/NiNPs/GCE, and ZIF-67C@RGO/GCE. The catalytic current change of the amperometric i - t curve of nitrite demonstrated a linear relationship with the concentration in the linear range of 0.2–123 μM (R 2 = 0.9936) and 123–473 μM (R 2 = 0.998), and the limit of detection (LOD) reached 0.086 μM. Furthermore, the ZIF-67C@RGO/NiNPs/GCE showed good stability, reproducibility, and anti-interference ability. This developed sensor was successfully applied to the detection of nitrite in ham sausage.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Qingyu Luo,Wei Xu,Shaolong Tang
Exploring excellent catalysts for oxygen reduction reaction (ORR) with a facile and cost-effective method is desirable but remains challenging. Herein, ultra-small PtCu 3 nanoparticles ( ca. 2.7 nm), immobilized on reduced graphene oxide (rGO), were synthesized via a novel and general strategy. Traceless protectant, NH 4 OH, was used to resist the aggregation of graphene oxide (GO), and the spray-freeze-drying method ensures excellent dispersion of the Pt and Cu precursors, which could not be achieved by other reported drying methods. After annealing, the nanoparticles with the highest mass loading, 52%, among reported ordered Pt-based catalysts were obtained. The PtCu 3 /rGO shows a remarkable electrocatalytic performance. Density functional theory calculations elucidate that PtCu 3 possess a lowered energy barrier of the rate-determining step, contributing to significantly improved ORR kinetics. This strategy was extended to the synthesis of other binary- and quaternary-metallic Pt-based nanoparticles, which proved its generality and applicability towards the potential commercialization of fuel cell technologies.
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