CARBON
·
2021
·
IF 9.594
Qingqing Chen,Daxin Li,Zhihua Yang,Dechang Jia,Yu Zhou,Ralf Riedel,Tao Zhang,Chenguang Gao
SiBCN-reduced graphene oxide (SiBCN-rGO) ceramic composites with different rGO content derived from a single-source precursor were successful synthesized by polymer derived ceramics routes to tune their dielectric properties and electromagnetic wave absorption capacity . SiBCN-rGO ceramic composites with 6 wt% GO annealed at 1300 °C possessed the best microwave absorption performance obtaining the minimum reflection coefficient (RC min ) of −62.71 dB at 10.72 GHz, and the thin thickness of 2.17 mm. Adjusting its thickness to 1.58 mm could obtain the maximum effective absorption bandwidth (RC < −10 dB) of 4.32 GHz. The microwave absorption mechanisms of the as-prepared SiBCN-rGO ceramic composites were mainly attributed to the conductive loss and polarization loss induced by the synergistic effects of amorphous SiBCN matrix, rGO and SiC nanocrystals .
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Hongtao Zou,Shiliang Zhang,Xiaoling Hong,Qilu Yao,Yan Luo,Zhang-Hui Lu
As an ideal hydrogen supplier in liquid phase, hydrous hydrazine has gained a lot of attention for safe and efficient storage as well as transportation of hydrogen. Herein, a low Pt-containing Ni–Pt bimetallic catalyst immobilized on novel MIL-101/rGO composite has been prepared by a facile impregnation-reduction approach. Unexpectedly, the resultant Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst exhibits optimal catalytic performance and 100% H 2 selectivity for hydrogen evolution from hydrous hydrazine under alkaline conditions at 323 K, giving a turnover frequency (TOF) value of 960.0 h −1 , which is a relatively higher value ever reported heterogeneous catalysts. Even at room temperature, Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst shows excellent catalytic activity for dehydrogenation of hydrazine as well as hydrazine borane. In addition, the Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst also exhibits excellent durability. Even after eight recycles, the catalytic activity is no significant decrease, and the H 2 selectivity still remains 100%.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 39
·395710
·
IF 3.551
Yan Wang,Xiaochuang Di,Xiang Gao,Xinming Wu
Carbon-based composites have triggered tremendous attention in the development of high-efficiency microwave absorbers, due to their compatibility, light weight, and high microwave absorption. However, fabricating carbon-based absorbers with a strong absorption ability in a broad frequency range is challenging. Hence, a facile strategy was used to produce Co@C derived from a zeolitic imidazolate framework (ZIF)@ graphene. The Co@C@RGO composite was obtained by annealing the ZIF67/GO nanocomposite precursor at 650 °C in a nitrogen atmosphere. Due to the magnetic loss induced by the Co particles, the dielectric loss generated by the carbon skeletons and graphene, and the interfacial polarization between the components, the hierarchical composite exhibits superior electromagnetic (EM) wave absorption properties. The optimal reflection loss (RL) of the Co@C@ RGO composite can be up to −67.5 dB at 2.6 mm, and the effective bandwidth (≥−10 dB) is 5.4 GHz (10–15.4 GHz) with a thickness of 2 mm at 20 wt% loading. The dipolar polarization caused by graphene, as well as enhanced impedance matching, synergistic effect and interfacial effect among the components, increase the microwave absorption performance of the composite. This work may open a new path to use the Co@C@RGO composite with its high-efficiency EM wave properties as an absorber.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 10
·B821
·
IF 3.12
Pengfei Li,Zhenping Liu,Zhibin Yan,Xin Wang,Eser Metin Akinoglu,Mingliang Jin,Guofu Zhou,Lingling Shui
Insufficient or excessive consumption of Vitamin B2 (Vit B2) and Vitamin B6 (Vit B6) can cause harmful effects on human health conditions, it is therefore very important to control their content in supplements and food products. In this work, we report on a simple, sensitive and selective electrochemical sensor based on gold nanoparticles (AuNPs) on glassy carbon electrode (GCE) modified by a hybrid of polydopamine and reduced graphene (PDA-RGO), for determination of Vit B2 and Vit B6. The hybrid nanomaterial comprising PDA-RGO supported AuNPs is constructed through a one-step GCE modification process for electrochemical quantification of Vit B2 and Vit B6 in pharmaceutical formulations. Cyclic voltammetry result reveals that the effective response to Vit B2 and Vit B6 is according to the high electrical conductivity of AuNPs and the large surface area of PDA-RGO. Meanwhile, the sensor modified with a composite film shows a synergistic effect for catalyzing the analytes. Under optimized experimental conditions, these sensors show wide linear ranges of 0.02−60.0 μM and 0.03−600.0 μM, with the detection limits (LODs) of 0.0096 μM and 0.025 μM for Vit B2 and Vit B6, respectively. Additionally, the constructed sensors have been applied for quantifying Vit B2 and Vit B6 in pharmaceutical formulations. Such an effective electrochemical platform could be potentially applied for analyzing various components for therapeutic drug monitoring.
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高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 20
·6285-6293
·
IF 6.177
Jie Lian,Qiang Bai,Jinyu Zhao,Xiaomin Wang
It is a grand challenge to develop non-noble metal-based oxygen reduction (ORR) catalysts with relatively high activity and stability for proton exchange membrane fuel cells (PEMFCs). Herein, zeolitic imidazolate framework (ZIF) precursors were grown in situ on graphene oxide (GO), and Co-N-RGO catalysts with good stability were successfully prepared. Density functional theory (DFT) calculation results show that Zn and Co are mixed and alternated to form a Zn-Co-ZIF structure instead of forming ZIF-8 or ZIF-67, separately. Such a combination promoted the uniform distribution of Co atoms in the N-doped carbon frameworks during subsequent heat treatment. By means of accurate adjustment of the molar ratio of Co/Zn species in the Zn-Co-ZIF precursors, the hierarchical porous structure connected with uniformly dispersed Co–Nx sites was established after thermal activation, and the utilization rate of active sites was improved. The RGO in catalysts, connecting each derivative carbon particle, formed a connected network and reduced the ohmic impedance of the catalyst layer. This strategy avoided the traditional tedious steps of additional acid-leaching and second heat treatments. What's more, the ORR performance of the Co-N-RGO samples was evaluated. The catalyst exhibited a positive half-wave potential (0.75 V vs. RHE), high limiting diffusion current density, and positive stability at 0.5 M H2SO4. Meanwhile, the H2/O2 fuel cell test result displayed a relatively high ORR activity with a peak power density of 334 mW cm−2.
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高影响因子
Nano Energy
·
2018
·
IF 13.12
Minghui Cao,Minqiang Wang,Le Li,Hengwei Qiu,Muhammad Amin Padhiar,Zhi Yang
Wearable sensors with high sensitivity, fast response and recovery are highly desirable for many new application fields. Herein, we synthesized the cotton fiber which coated with reduced graphene oxide doped with silver nanowire (rGO-Ag NW@cotton fiber) via a simple and environmentally friendly hydrothermal method . The flexible and wearable rGO-Ag NW@cotton fiber based piezoresistive sensor was fabricated with the orientation of face-to-face, where the cotton fiber coated with reduced graphene oxide (rGO@cotton fiber) was used as the lower part of the sensor. The addition of silver nanowire (Ag NW) provides a faster and more convenient channel for charge transfer, resulting in the greatly improvement of the performance, showing the high sensitivity, accompanied with the fast response and relaxation properties. With the effectively wrapping and protection of reduced graphene oxide (rGO), Ag NW was well protected and avoid being oxidized by the air, which contributes significantly to the excellent stability of the sensor. Under the synergistic effect of Ag NW and rGO, rGO-Ag NW@cotton fiber based piezoresistive sensor can be well used in detecting human activities such as finger pressing, bending, twisting, walking and pulse waves, showing high sensitivity, fast response, fast recovery and high stability. These results indicate that the rGO-Ag NW@cotton fiber based piezoresistive sensor has an enormous potential for application in the flexible and wearable pressure sensors.
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高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 4
·1460-1470
·
IF 8.64
Cheng Yufei,Sun Qian,Li Qiujie,Zhang Wenwan,Liu Enzhou,Fan Jun,Xie Haijiao,Miao Hui,Hu Xiaoyun
Antimony selenide (Sb 2 Se 3 ) is a narrow-band-gap semiconductor that has been increasingly used as an excellent light-harvesting material in photoelectrocatalysis. The unique connections of the one-dimensional (Sb 4 Se 6 ) n ribbon structural units determine the high anisotropy of their carrier transport. In this study, a reduced graphene oxide (rGO)-modified quasi-one-dimensional Sb 2 Se 3 @In 2 S 3 light-trapping heterostructure was successfully constructed by vapor transport deposition followed by an in situ hydrothermal method. The results showed that the thickness of the in situ grown non-layered In 2 S 3 nanosheets was significantly reduced from 30 to 10 nm under the space-confinement effect of rGO, facilitating the construction of light-trapping nanostructures and increasing the electrochemically active surface area of the photoelectrode. The quasi-one-dimensional Sb 2 Se 3 @In 2 S 3 -rGO nanorod photoelectrode achieved a higher photocurrent density (1.169 mA cm −2 ), which was 2 and 16 times higher than that of Sb 2 Se 3 @In 2 S 3 and pristine Sb 2 Se 3 , respectively. The ultrathin In 2 S 3 nanosheets were co-modified with rGO nanosheets to fabricate a brush-like composite photoelectrode that exhibited favourable stability with an average hydrogen production rate of 16.59 µmol cm −2 h −1 under neutral conditions. The experimental results and theoretical calculations both showed that the significant improvement in photoelectrochemical performance can be perfectly explained by the type-II heterojunction mechanism. This study provides a new exploration to design rGO-modified composite photoelectrodes for photoelectrochemical applications.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Runjiang Guo,Weixing Huo,Kaifeng Wang,Dongliang Shi,Jiadong Wu,Hua Li,Hezhou Liu
In this report, we synthesized novel Co–Zn co-doped stannate (Co x Zn 1-x SnO 3 ) hollow balls via an ion co-precipitation method. The as synthesized Co x Zn 1-x SnO 3 exhibited excellent dielectric and magnetic properties , which were conducive to the microwave absorption. We also embedded the as prepared Co x Zn 1-x SnO 3 nanoparticles into rGO 3D aerogels (rGO@Co x Zn 1-x SnO 3 ) to enhance their microwave absorbability. Several characterization techniques were utilized to investigate the structures, morphologies, compositions and specific surface areas of the Co x Zn 1-x SnO 3 and rGO@Co x Zn 1-x SnO 3 aerogels respectively. In addition, associated electromagnetic parameters of various as prepared samples were also measured to simulate the microwave absorbability of the 3D rGO@Co x Zn 1-x SnO 3 aerogels. The simulation results indicated that the maximum reflection loss (RL max ) of rGO@Co 0.7 Zn 0.3 SnO 3 could reach up to −38 dB at 10.6 GHz with an absorber thickness of only 3 mm. The maximum efficient absorption bandwidth (EAB) of the rGO@Co 0.7 Zn 0.3 SnO 3 hollow balls was over 8 GHz (from 10 GHz to 18 GHz) with an absorber thickness of only 3.5 mm. The enhanced performance was ascribed to high attenuation capability, reasonable impedance matching, multiple interfacial polarizations and proper synergistic effect. This work demonstrated that the rGO@Co x Zn 1-x SnO 3 aerogels with light-weight and strong microwave absorbability have great potential to be used as a microwave absorber.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Peng Zhang,Ji-Lai Gong,Guang-Ming Zeng,Biao Song,Siyuan Fang,Mi Zhang,Hong-Yu Liu,Shuang-Yan Huan,Ping Peng,Qiu-Ya Niu,Dong-Bo Wang,Jun Ye
In this work, a novel rGO/S-GO laminated membrane was prepared by a pressure-assembly stacked method, followed with a thermal deoxygenation process. The neighboring interlayer spacing ( d ) between the composite layers are tunable due to the incorporation of S-GO. The nano-filtration performances of the rGO/S-GO laminated membranes were evaluated at a low-pressure condition. Molecule dynamics (MD) simulation was used to further investigate the size distribution of spacing between GO, rGO and S-GO sheets. The results of filtration experiments indicated that the obtained rGO/S-GO membrane showed a satisfied rejection performance for the removal of dyes and salts with a pressure of two bar. The rejection rates of MB, CR, RB and MO were 99.5%, 99.9%, 97.3% and 98.6%, while the rejection rates of Na 2 SO 4 , MgSO 4 , MgCl 2 and NaCl were 86.3%, 40.9%, 35.7% and 60.5%, respectively. Compared to the pristine rGO membrane, the water permeation of rGO/S-GO laminated membrane was significantly improved from ∼0.98 to ∼3.78 L/(m 2 ·h·bar) due to the enlarged ‘gateway’ for transport of water molecules. The results of classical MD simulation showed that the neighboring layer spacing of rGO, GO and S-GO was ∼8.4, ∼10.2, and ∼14.3 Å, respectively. Their neighboring layer spacing was dependent on the chemical functional groups on the edges of GO sheets. It was further confirmed that the introduction of chemical groups on the GO caused the expansion of the interlayer ‘gap’ between neighboring sheets, which was responsible for the enhanced permeability. These findings would contribute to the development of GO-based nanofiltration membranes with high permeability and understanding the transport mechanism of water molecule.
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高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1109
·
IF 4.034
Fa-Gui He,Jia-Yi Yin,Gaurav Sharma,Amit Kumar,Florian J. Stadler,Bing Du
A hierarchical composite based on the modified reduced graphene oxide with platinum-nickel decorated polyaniline nano-spheres (rGO/PANI@PtNi) was facilely prepared via microwave-assisted self-reduction for an application in nonenzymatic hydrogen peroxide (H2O2) detection. Compared to the pristine rGO, the composite exhibited a much tougher surface due to the stacking of conductive PANI nano-spheres on rGO sheets, leading to good dispersion of PtNi nanoparticles and a large active area. Furthermore, the multi-valance Ni2+/3+in the PtNi particles effectively promoted the catalytic property of Pt sites and facilitated a superior electrochemical performance of PtNi alloy than that of neat Pt. Owing to the synergistic effect of the improved electrical conductivity and the promoted electrocatalytical property, the modified glassy carbon electrode (GCE) with rGO/PANI@PtNi nanocomposite displayed an outstanding electrochemical sensitivity towards H2O2with a fast response time (<2 s), a wide linear range (0.1–126.4 mM), a low detection limit (0.5 µM), as well as a long-life stability for one week without obvious degradation. This novel strategy opens a novel and promising approach to design high performance sensors for H2O2detection.
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Nan Zheng,Jie Liu,Yuhang Wang,Chunmei Li,Qiuyu Zhang
Self-healing coatings healed by the synergistic action of ultraviolet light and moisture are developed. Firstly, a polysiloxane-based healing agent, containing acryloyloxy (CH 2 =C(CH 3 )COO-)and methoxy silane(-SiOCH 3 )groups, is synthesized and encapsulated in chitosan-reduced graphene oxide (CS-RGO) microcapsules with compact CS-RGO shell structures. The CS-RGO microcapsules containing the polysiloxane core are then embedded in epoxy-modified silicone resin to achieve efficient self-healing coatings. Herein, an assembly time of 2.5 h results in a complete stacking of GO sheets on the emulsion droplets. As the CS/GO ratio increase, the reduction degree of GO, the sphericity of the CS-RGO microcapsules, and the average diameter all increase. Moreover, the compact CS-RGO shell formed by the assembly and stacking GO sheets as well as the interactions between CS and GO helps to maintain effectiveness of the core and stability of the microcapsules. The result shows that embedding of the CS-RGO microcapsules in the resin matrix improves the mechanical properties and anti-corrosion properties of the matrix. What’s more, the self-healing coatings with the UV/moisture dual healing mode is beneficial for achieving superior self-healing effects, which is promising for various industries, especially the over-water construction of ships, bridges, pipelines, etc.
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高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2021
·Vol. 54
·期 31
·315505
·
IF 3.207
Jin-Hua Liu,Yan-Fei Li,Yan-Hong Shi,Jin-Zhi Guo,Jin Yang,Xing-Long Wu,Jing-Ping Zhang,Wei Hu,Hai-Zhu Sun
Antimony (Sb) and its oxides, as promising electrode materials, have attracted much attention because of their low cost, environmental friendliness, and high theoretical capacity. Herein, boron doped flower-cluster-like Sb/SbO2@reduced graphene oxide (rGO) composites are synthesized for use as sodium-ion battery anode materials using a solvothermal strategy. The contents of Sb and antimony oxide (SbO2) are controlled by adding different contents of NaBH4. Meanwhile, the introduction of NaBH4 successfully realizes boron doping and enlarges the lattice spacing of the SbO2, improving its conductivity and Na+ transport. As a result, optimal Sb/SbO2@rGO-10 composites display a desirable capacity of 346 mAh g−1 at 50 mA g−1 after 100 cycles with a capacity retention of 106%. Even at high current densities, a capacity of 236 mAh g−1 is achieved, demonstrating a satisfactory rate capacity. Moreover, the Sb/SbO2@rGO-10 electrode shows satisfactory Na storage performance at low temperatures. In addition, sodium-ion full cells are assembled using an Sb/SbO2@rGO-10 anode and a Na3V2(PO4)2O2F cathode, with which a satisfactory electrochemical performance of 102 mAh g−1 after 50 cycles at 50 mA g−1 is achieved, showing their high practical potential.
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高影响因子
危险品化学品经营许可证（带存储）