JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Li Zhang,Yao Tian,Chunxiao Song,Hong Qiu,Hao Xue
A facile two-step synthesis method was developed to prepare nitrogen-doped reduced graphene oxide/multi-walled carbon nanotubes/manganese dioxide (NGC/MnO 2 ) fiber electrode for flexible all-solid-state supercapacitors . Firstly, the NGC fibers were prepared through hydrothermal method , and then NGC/MnO 2 fibers were obtained by a redox reaction with different reaction times (0.5–2.5 h). The NGC/MnO 2 -2h fiber electrode exhibited a larger specific capacitance of 367.7 F cm −3 at a current density of 0.5 A cm −3 and an excellent cycling stabilty. A flexible all-solid-state supercapacitor device was obtained through two parallel-arranged NGC/MnO 2 -2h electrodes coated with PVA-LiCl gel electrolyte. The flexible all-solid-state supercapacitor exhibited a high energy density of 5.9 mWh cm −3 and a good cycling performance. Moreover, the supercapacitor showed excellent flexibility properties, which is advantageous for its application in flexible energy storage devices.
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高影响因子
IONICS
·
2020
·Vol. 26
·期 9
·4499-4510
·
IF 2.394
Liu Jian,Xu Ying-Ge,Kong Ling-Bin
Herein, molybdenum trisulfide/nickel disulfide-reduced graphene oxide (Mo 2 S 3 /NiS 2 -RGO) composites as anode material for sodium-ion batteries (SIBs) and sodium-ion capacitors (SICs) were synthesized by one-step facile hydrothermal method. Through electron microscopy analysis, it could be observed that the Mo 2 S 3 /NiS 2 nano-rods and nano-balls were dispersed uniformly over the two-dimensional RGO sheets. When tested as an anode material, Mo 2 S 3 /NiS 2 -RGO showed a considerable reversible capacity of 653.1 mA h g −1 at 100 mA g −1 after 50 cycles and capacity retention of 197.5 mA h g −1 at 5000 mA g −1 after 226 cycles. The sodium storage mechanism of Mo 2 S 3 /NiS 2 -RGO was explained by ex situ XPS. Furthermore, as-fabricated SICs delivered an excellent specific energy of 182.7 W h kg −1 (at 1120 W kg −1 ), and SIBs exhibited the discharge capacities of 85 mA h g −1 at 2 C. Overall, the superior electrochemical performances of Mo 2 S 3 /NiS 2 -RGO demonstrated that it was a promising anode materials to construct high-performance full cell.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 25
·12586-12593
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IF 11.301
Cuiqin Fang,Dong Zhang
Recently, structural supercapacitors have attracted considerable attention due to their concurrent capability to store electrochemical energy and support mechanical loads. However, the greatest challenge in realizing an integrated electro-mechanical system is the development of highly compatible electrodes and structural electrolytes with superior mechanical and electrochemical performance. Here, a structural supercapacitor assembled with a 3D rGO@MnO2 nickel foam electrode and polyacrylic acid–Portland cement–KOH electrolyte is reported to solve the challenge for the first time. The resulting rGO@MnO2 electrode exhibits a high areal capacitance of 1.84 F cm−2 at 0.5 mA cm−2, with the areal capacitance remaining at 1.13 F cm−2 even at a current density of 40 mA cm−2. The structural electrolyte with 6 wt% polyacrylic acid–Portland cement–KOH shows the best combination of an ionic conductivity of 2.13 mS cm−1 and a compressive strength of 28.5 MPa. The resulting asymmetric structural supercapacitor with an areal capacitance of 51.5 mF cm−2 at 0.1 mA cm−2 is superior to those reported in latest studies based on carbon materials and resin, which suggests its potential application in structural energy storage for civil engineering.
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International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 2
·220-231
·
IF 1.713
Yang Tao,Liu Hui-juan,Bai Fan,Wang En-hui,Chen Jun-hong,Chou Kuo-Chih,Hou Xin-mei
Currently, developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge. In the present work, few-layer hexagonal boron nitride nanosheets (h-BNNSs) with a thickness of 2–4 atomic layers were fabricated via vacuum freeze-drying and nitridation. Then, the h-BNNSs/reduced graphene oxide (rGO) composite were further prepared using a hydrothermal method. Due to the combination of two two-dimensional (2D) van der Waals-bonded materials, the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from −10 to 50°C. When the electrodes worked in a neutral aqueous electrolyte (1 M Na 2 SO 4 ), they showed a great stable cycling performance with almost 107% reservation of the initial capacitance at 0°C and 111% at 50°C for 5000 charge—discharge cycles.
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高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Zhenkui Li,Na Wei,Man Zheng,Anping Yao,Ruiqi Xu,Xiaojie Song,Huanhuan Wang,Qiao Liu,Hongzhi Cui
Solar steam generation is a prospectively technology that could be used to alleviate the problem of water shortage. Here, we design a 1D/2D W 18 O 49 /rGO heterostructure and construct a bilayer structure of light absorber, which contains W 18 O 49 nanofibers and rGO nanosheets composite layer for sunlight harvesting and a pre-treated wood layer for water supply and thermal insulation . With an optimized composition of the 1D/2D W 18 O 49 /rGO heterostructure, the constructed interfacial evaporation system demonstrate a quick thermal response and achieve a steady-state evaporation efficiency of 86.5% with the evaporation rate of 1.34 kg∙m −2 ∙h −1 under one sun illumination, and it exhibits excellent cycle stabilities after 25 cycles. Moreover, the salinity of the sea water is greatly reduced, much less than the World Health Organization (WHO) standards of the drinking water . This novel and facile bilayer structure demonstrates substantial promise for application in the fields of solar evaporation to deal with the problem of water shortage.
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Advanced Materials Interfaces
·
2019
·Vol. 7
·期 1
·1901446
·
IF 4.713
Zhenming Chu,Weicheng Jiao,Yifan Huang,Guomin Ding,Xue Zhong,Meiling Yan,Yongting Zheng,Rongguo Wang
Icing accretion on the surface of an aircraft not only increases the weight but also causes changes in the surface shape, so there is an urgent need for anti-icing/deicing without shutdown. Here, a graphene-based film with light weight, super-hydrophobicity, high electric heat, and durability, which has both anti-icing properties and electrothermal deicing capability, is proposed. The film is prepared with 1 H ,1 H ,2 H ,2 H -perfluorodecyltrichlorosilane (FDTS)-modified SiO 2 /rGO wrinkles, and it has a micro-nanoscale hierarchical structure. Moreover, the superhydrophobic properties of the film can be controlled by adjusting the wrinkle size. Because of its good water repellency, the film can prevent and delay the freezing of water droplets at low temperatures. At −10 °C, compared to a smooth rGO film, the icing time of 10 µL supercooled water droplet on the micro-nanoscale hierarchical structured film can be delayed by ≈8.3 times, and the ice adhension decreases greatly. In addition, the film exhibits high-efficiency electrothermal properties. At −10 °C, under a low voltage of 15 V, the film can be heated rapidly to achieve rapid deicing and defrosting. The graphene-based micro-nanoscale hierarchical structure shows great potential in the field of sky anti-icing and real-time deicing.
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IONICS
·
2019
·Vol. 26
·期 2
·777-787
·
IF 2.289
Jing Pengcheng,Lu Huimin,Yang Wenwen,Cao Yuan,Xu Binbin,Cai Wei,Deng Yan
Magnesium batteries based on Mg 2+ /Li + dual ion electrolytes (MLIBs) have attracted increasing attention due to fast Li + or Mg 2+ /Li + insertion kinetics, abundant Mg resources, and high volumetric capacity of dendrite-free Mg anodes. Herein, we report polyaniline (PANI)–coated VS 4 @reduced graphene oxide (rGO) with nanostructures synthesized via hydrothermal synthesis and subsequent PANI polymerization as the cathode material for MLIBs. The PANI layer serves as a conductive medium to enhance electron transfer and Mg 2+ /Li + transportation as well as to mitigate the structure changes of VS 4 during the cycling process. Indeed, this material demonstrates enhanced electrochemical performance with a high discharge capacity of 200.7 mAh g −1 after 20 cycles and 91.2% retention after 50 cycles. Mechanism analysis reveals that Li + insertion into VS 4 produced an amorphous VS 4 host in the first discharge, which inclined to store Mg 2+ rather than Li + in the subsequent cycles. Our study provides new insights into the development of amorphous electrode materials for magnesium batteries.
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Journal of Materials Chemistry C
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2019
·Vol. 8
·期 6
·2123-2134
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IF 6.641
Zhen Xiang,Juan Xiong,Baiwen Deng,Erbiao Cui,Lunzhou Yu,Qingwen Zeng,Ke Pei,Renchao Che,Wei Lu
Developing electromagnetic absorption materials with a strong absorption ability and wide absorption bandwidth has attracted widespread attention in the field of electromagnetic shielding, but it still remains a great challenge. Herein, we successfully developed 2D hierarchically laminated Fe3O4@nanoporous carbon (NPC)@rGO magnetic/dielectric nanocomposites as high-performance microwave absorbers through a facile microwave-assisted approach. The rational design of the composition (Fe3O4, NPC and rGO) and the hierarchical microstructure provided the nanocomposite with a micro-scale 3D magnetic coupling network, a hierarchical dielectric carbon network and good impedance matching, which were identified by the off-axis electronic holography and electromagnetic characterization. As expected, the Fe3O4@NPC@rGO composites achieved a strong reflection loss of −72.6 dB, a matching thickness of 2.0 mm and a broad bandwidth of 5.5 GHz. Such excellent achievements encourage the development of hierarchical magnetic EMA absorbers and provide remarkable inspiration for designing high-performance microwave absorbers.
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高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiang He,Linnan Bi,Yao Li,Chenggang Xu,Dunmin Lin
Much attention has been paid to the Cobalt-based sulfides in recent years due to their high specific capacity and strong catalytic activity in the field of sodium-ion batteries (SIBs). Nevertheless, the poor cycling stability and low rate capability have hindered their practical applications. Herein, an effective strategy for the rational design of CoS 2 nanoparticles embedded in the graphitic structured N-doped porous carbon spheres interlinked by the reduced graphene oxide (rGO) nanosheets (rGO-CoS 2 -GNCSs) is proposed. The interconnected multidimensional nanostructure constructed by CoS 2 nanoparticles, graphitic structured N-doped porous carbon spheres and rGO nanosheets can provide a fast transfer pathway for electrons and electrolyte ions, which helps enhance the electric conductivity of the material and facilitate the reaction kinetics in SIBs. Moreover, benefiting from this unique microstructure, the change of the volume during sodiation/desodiation can be effectively alleviated and the stability of the architectural morphology can be enhanced. As a result, the rGO-CoS 2 -GNCSs used as the anode of SIBs presents an impressive electrochemical performance at a cut-off voltage of 0.4–2.9 V in the electrolyte of 1.0 M NaCF 3 SO 3 in diglyme , delivering a high reversible capacity of 523.9 mAh g −1 at 100 mA g −1 after 150 cycles, an excellent rate capability of 423.3 mAh g −1 at 2 A g −1 and extraordinary long-term cycling stability of 465.9 mAh g −1 at 500 mA g −1 after 600 cycles and 412.2 mAh g −1 at 1 A g −1 after 400 cycles. This study puts forward a promising strategy for the rational design of anode materials for high-efficiency sodium storage by interconnecting transition metal compounds , two-dimensional materials and nanocarbon to form multidimensional nanohybrids .
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RSC Advances
·
2019
·Vol. 9
·期 53
·31177-31185
·
IF 3.049
Shuaiqiang Jia,Jinlong Li,Guozhe Sui,Lijuan Du,Yulin Zhang,Yan Zhuang,Boxin Li
In this study, novel Gd/TiO2@rGO (GTR) nanocomposites with high photocatalytic performance were fabricated via a one-pot solvothermal approach. During the preparation step, graphene oxide (GO) was reduced to reduced graphene oxide (rGO), and subsequently, on the surfaces of which anatase TiO2 doped with Gd metal was grown in situ with a 3D petal-like structure. Gd doping into the classical TiO2@rGO system efficiently expands the absorption range of light, improves the separation of photogenerated electrons, and increases the photocatalytic reaction sites. The specific surface areas, morphological structures, and valence and conduction bands of the obtained GTR nanocomposites were analyzed and correlated with their enhanced photocatalytic performances for the degradation of an aqueous RhB solution. The experimental results indicated that the best performance was achieved with the 3% GTR composite, which exhibited the highest photoelectrocatalytic activity because of two aspects: the rapid separation of electrons and holes, and improvement in adsorption capacity. As compared with pure TiO2, the GTR composites demonstrated enhanced photoactivity due to synergetic effects between the effective photo-induced electron transfer from TiO2 to the surface of the rGO acceptor through interfacial interactions and the variation of structure and electrons under the adoption of Gd.
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yingqing Zhan,Shuangjiang He,Jiaxin Hu,Shumei Zhao,Guangyong Zeng,Mi Zhou,Guiyuan Zhang,Arijit Sengupta
Super-wetting MOFs@graphene hybrid has shown promising application for oil/water separation, due to high porosity, low density, and controllable wettability, however, achieving excellent stability and recyclability are found to be still challenging. In this study, sandwich-like UIO-66-F 4 @rGO hybrid was synthesized by immobilization of UIO-66-F 4 nanoparticles on rGO matrix, which featured the unique micro/nano hierarchy with hydrophobic characteristics. In order to realize the oil/water separation, as-prepared sandwich-like UIO-66-F 4 @rGO hybrid was applied as a potential candidate for constructing robust super-hydrophobic/super-oleophilic interfaces by using filter paper (FP) and melamine sponge (MS) as substrates. Typically, the surface modification of substrates can be easily achieved by simple dip-coating method, and interfacial adhesion between substrates and UIO-66-F 4 @rGO was enhanced by cross-linking of hydroxyl-fluoropolysiloxane (FPSO). Consequently, the super-hydrophobic/oleophilic UIO-66-F 4 @rGO/FP exhibited high contact angle of 169.3 ± 0.6° and was capable of separating various water-in-oil emulsions effectively. The flux and separation efficiency were 990.45 ± 36.28 Lm −2 h −1 and 99.73 ± 0.19 % driven by gravity, respectively. The super-hydrophobic/super-oleophilic UIO-66-F 4 @rGO/MS possessed selective oil absorption with absorption capacity of 26∼61 g/g depending on the viscosity of oils and continuous cleaning of oil spill. Furthermore, the UIO-66-F 4 @rGO composite could tolerate high/low temperature, corrosive solutions, and physical damage, displaying robust and stable super-hydrophobic/super-oleophilic interfaces for treating oily wastewater in harsh environments.
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高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 18
·4160-4164
·
IF 7.804
Yan Zhang,Huinan Guo,Weiqin Li,Yike Huang,Zeting Zhang,Guishu Liu,Yijing Wang
Graphical Two in one : A composite of a calcium organic salt, Cabpdc (bpdc=4,4′-biphenyldicarboxylate) and reduced graphene oxide (rGO) improves two issues related to organic electrodes: high solubility in organic electrolytes and low electronic conductivity. The Cabpdc/rGO composite displays competitive cycle and rate performances as an anode for sodium-ion batteries. Organic electrodes hold great promise for sustainable electrodes in sodium-ion batteries (SIBs) owing to their easy availability from biomass. However, traditional organic electrodes suffer from two inherent problems, high solubility in organic electrolytes and low electronic conductivity. Here, a calcium organic salt, Cabpdc (bpdc=4,4′-biphenyldicarboxylate) was designed and formed into a composite with reduced graphene oxide (rGO) to improve these two problems by a “two-in-one” approach. As expected, the Cabpdc/rGO composite displayed competitive cycle and rate performances as an anode for SIBs. Additionally, all-organic sodium-ion full cells were successfully fabricated combining this anode with a commercial organic cathode, promising applications for sustainable SIBs.
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