Journal of Energy Storage
·
2023
·
IF 9.4
Wenkang Wang,Mengliang Hu,Zongtao Qu,Yao Dai,Kaixuan Chen,Shushen Lyu
Silicon suboxide (SiO x ) anodes have garnered significant attention from both academia and industry due to their superior theoretical capacity compared to graphite, as well as their improved capacity retention in comparison to pure silicon. Nevertheless, SiO x electrodes still confront the challenge of substantial volume expansion (>160 %) during the alloying process, resulting in electrode structural damage or even fragmentation and severely impacting cycling performance. Here, a three-dimensional (3D) conductive network was constructed by ethylenediamine (EDA) cross-linking reduced graphene oxide (rGO), which was encapsulated on the surface of SiO x spheres generated in situ via a magnesium thermal reduction reaction. Accordingly, the SiO x @rGO-EDA anode was prepared successfully with high reversible capacity (892 mAh g −1 after 100 cycles at 1 A g −1 ) and fascinating rate performance (447 mAh g −1 at 4 A g −1 ). In full cell, the SiO x @rGO-EDA anode also exhibits outstanding cycling stability (154 mAh g −1 after 100 cycles at 0.1C) and rate capability. The scanning electron microscopy (SEM) images captured from a top-view perspective indicate that the surface of SiO x @rGO-EDA electrode is smooth and dense without any noticeable cracks, and it maintains its structural integrity throughout the cycling process. The cross-sectional thickness of the electrode remains essentially the same. These results illustrate the superior structural stability of the EDA cross-linked graphene conductive network cladding structure, enabling it to adapt to dynamic changes and ensure efficient transport of lithium ions and electrons. The facile and versatile synthesis method of SiO x @rGO-EDA structures by incorporating cross-linking agents provides inspiration for the design of next-generation high-performance anodes.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yeqi Zhu,Chao Jin,Zhonghao Ning,Wenyan Huang,Shengjian Mao,Zhichao Xue,Siqi Lan,Qianwen Tao,Rongqian Yao
Actualization of well-balanced high porosity with simultaneous increase in hardness/fracture toughness for thermal insulation composites in hypersonic aerospace vehicle components is always of great challenge. Considering significant toughening effect of unique Mo 4.8 Si 3 C 0.6 -SiC composites microstructure, an agile strategy is proposed to prepare porous Mo 4.8 Si 3 C 0.6 /SiC(rGO) polymer-derived ceramics (PDCs) via re-pyrolysis of ball-milling-induced MoSi 2 -SiC(rGO) p /polycarbosilane-vinyltriethoxysilane-graphene oxide (PVG) precursors blends with polystyrene (PS) as pore-forming agent. In-situ formed Mo 4.8 Si 3 C 0.6 -β-SiC nanocrystals , possessing eminent mechanical properties and good compatibility with SiO x C y /C free , can significantly strengthen interface bonding and increase disorder of ceramic network. Such effective hindrance to crack propagation moderates the inherent brittleness while retaining high hardness of SiC PDCs. Moreover, dense Mo 4.8 Si 3 C 0.6 -β-SiC/SiO x C y /C free (rGO) framework, with spontaneous regular pore structure , well balances loading/thermal insulation capacity. Particularly, samples with 10 wt.% PS exhibit outstanding mechanical performances (hardness: 5.10 GPa; fracture toughness: 2.24 MPa·m 1/2 ; compressive strength : 58.15 MPa) and low thermal conductivity (0.8427 W·m - 1 ·K - 1 ). As demonstrated, products remain decent structural integrity after ablation of butane blowtorch flame for 1-20 min. The synergy oxidation with fast response of Mo 4.8 Si 3 C 0.6 and durability of β-SiC facilitates great anti-oxidation ability, opening up manufacture of SiC-based composites for thermal protection system (TPS) of hypersonic vehicles and re-entry spacecraft with ultra-high speed.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1308-1317
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IF 3.925
Xuebin Hou,Zelong Huang,Liu Hu,Qufu Wei,Yi Hu
Construction of molybdenum phosphides (MoP) that are connected to conductive composite materials has been demonstrated to be an effective strategy for improving the activity of MoP, and it is crucial for both the hydrogen evolution reaction (HER) and lithium-ion batteries (LIBs). However, increasing the exposed active sites and simultaneously enhancing the synergistic effect between MoP and the conductive substrate is challenging. Herein, constructing a multi-hierarchical conducting connection based on carbon nanoparticles and reduced graphene oxide (rGO) sheets was proposed. MoP nanoparticles were in situ grown in a carbon matrix to form flower-like MoP/C particles and were well scattered in stable lamellar rGO nanosheets. Benefiting from the conductive network and good dispersion of active sites, the resultant MoP/C-rGO hybrid exhibits efficient HER activity, with Tafel slopes of 69 mV dec−1 and 87 mV dec−1 under acidic and alkaline conditions. Significantly, even when applied as an anode for LIBs, it demonstrates excellent storage performance with a high specific capacity and long-term stability. It displays superior cycle performance of a reversible capacity of 624.6 mA h g−1 at 0.5 A g−1 after 500 cycles. This work provides insight into the construction of multi-hierarchical structures for efficient bifunctional nanostructural electrodes for energy conversion and storage.
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高影响因子
CARBON
·
2023
·
IF 10.9
Yuan Shu,Tingkai Zhao,Xianghong Li,abdul Jalil,Lei Yang,Guyue Feng,Yatao Li,Weiyu Jia,Fa Luo
To optimize the electromagnetic wave performance for absorbers, it is crucial to implement rational structural designs and integrate multiple loss modes in a coordinated manner. Here, three-dimensional (3D) porous macroscopic coral-like Co/CoO/reduced graphene oxide aerogels (Co/CoO/RGO), are successfully fabricated by an ice-templated freeze-drying and thermal reduction techniques, and their pore structures , involving aperture and total pore volume , are availably regulated by manipulating the water addition. The electromagnetic parameters and electromagnetic wave performance appear strong response toward the variation of pore structure. By controlling the pore structure, these parameters can be efficaciously tunned, thus manipulating the performance. The optimized absorption performance is obtained when the water addition is 1 ml, the minimum reflection loss reaches to −61.8 dB and the effective bandwidth is 4.2 GHz. Such good performance is inseparable with the 3D crosslinked conductive framework, the hybrid of magnetic and dielectric units, numerous heterointerfaces and countless pores walls in aerogels, which brings multiple electromagnetic wave loss mechanism. Moreover, it is very important that Co/CoO/RGO aerogels also integrate good hydrophobicity and heat insulation properties, allowing their application in harsh conditions. This work shows the potential of pore structural control engineering for producing multifunctional aerogels.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Ming Wang,Yue He,Wei Hong,Shi Yi Zhang,Chan Xu Yang,Ding Shen,Xiao Liang Wang,Cheng Yan
At present, the wide commercial application of Li4Ti5O12 (LTO) is limited as an anode for lithium-ion batteries because of its poor conductivity and lower rate performance. In this paper, LTO nanoparticles were embedded in a reduced graphene oxide (rGO) conductive network by an in situ electrostatic self-assembly effect using a simple hydrothermal reduction method. The microstructure and electrochemical performance of the LTO/rGO composite were investigated. The highlighted results showed that LTO nanoparticles were combined with rGO nanosheets by a Ti–O–C covalent bond, which was more stable than other bonding methods. At the same time, the addition of rGO not only enriches the structure and increases the specific surface area but also effectively prevents the agglomeration of LTO. The higher conductivity of LTO nanoparticles was bestowed by the rGO three-dimensional (3D) network, causing structural stability and high electrochemical performance. The LTO/rGO composite has high first discharge capacity (643.9 mAh/g at 0.5C), remarkable rate performance (290 mAh/g at 10C), and excellent cycle stability (271.7 mAh/g after the 1000th cycle at 10C) when tested in a half battery. Furthermore, it has higher discharge capacity (181.8 mAh/g at 1C, the first Coulombic efficiency was 90.1%) and excellent cycle stability (142.8 mAh/g after 500 cycles at 20C) when assembled into a full battery as the anode with commercial LiFePO4 (LFP) as the cathode. The lithium storage mechanism of the LTO/graphene composite was further discussed by first-principles calculations. With the addition of graphene to LTO, the electron transport ability was improved and the diffusion energy barrier was reduced. This made the composite expected to become a promising anode material for lithium-ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuan Shu,Tingkai Zhao,Jalil abdul,Xianghong Li,Lei Yang,Fa Luo
Addressing the growing issue of electromagnetic radiation calls for urgent exploration of effective electromagnetic wave absorbers. Herein, a series of coral-like Co/CoO nanoparticles/reduced graphene oxide (Co/CoO/RGO) hybrid aerogels were synthesized via a freeze drying-thermal reduction strategy. Their advantages involving porous interconnected framework, abundant heterogeneous interfaces, and integration of dielectric/magnetic units could bring multiple loss modes. By manipulating the Co(CO 3 ) 0.5 (OH)·0.11H 2 O (CCOH) addition and reduction temperature, the electromagnetic parameters could be tuned, ultimately resulting in optimal absorption capability with maximal reflection loss of –32.4 dB and effective bandwidth of 4.2 GHz. More importantly, excepting the high electromagnetic wave loss, Co/CoO/RGO hybrid aerogels also exhibit good hydrophobicity and thermal insulation properties, making them suitable for application in harsh environment. Besides, the special structure and multiple components lead to multiple heterointerfaces in aerogels, the resultant interface polarization is deemed to contribute to electromagnetic wave loss. Here, Density Functional Theory (DFT) simulation based on first-principles is adopted to verify the contribution of interface polarization from the theoretical level. According to the simulation results, the electron-occupied states near the Fermi level are significantly different among the different phases comprising the heterointerfaces, and there is a noticeable accumulation of charge at these interfaces, successfully affirming the interface polarization behavior at different interfaces.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Qian Wei,Yan Yan,Qingmei Ge,Mao Liu,Nan Jiang,Hang Cong,Jiang-Lin Zhao
A novel photoelectrochemical sensor was constructed by ternary layer-by-layer composites of reduced graphene oxide (rGO), graphitic carbon nitride quantum dots (g-C 3 N 4 QDs), and hemicucurbit[12]uril (HemiQ[12]), on the Indium-Tin Oxide (ITO) piece in sequence. Electrochemical Impedance Spectroscopy (EIS) was employed to confirm the successful assembly of the sandwich electrode, and the functionalization of each layer was explored by comparing of the currents with stepwise coating of the materials to achieve the synergistic enhancement of photoelectrochemical intensity. The application of proposed electrode was achieved by ultrasensitive sensing for chloramphenicol (CAP), which provided a limit of detection low to 0.089 nM, with high selectivity, good reproducibility and stability. The acceptable recoveries for the determination of CAP in real samples of honey and milk illustrated the feasibility of the established analytical method.
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ChemNanoMat
·
2023
·Vol. 9
·期 5
·e202200569
·
IF 3.8
Yanyu Li,Xiaoyue Zhang,Jinglin Shen,Wei Qi
Graphical A new type of nanocomposite enzymes has been developed, composed of Pd−Pt nanoparticles, hemin-rGO and CNTs-COOH. The nanocomposites show a high peroxidase-like activity and a linear response toward H 2 O 2 in the range of 0.05–500 μM with a determination limit of 0.01 μM. Based on this, a paper sensor was constructed for H 2 O 2 detection in real samples. Nanocomposite enzymes are attracting intensive attention worldwide. In the present study, a novel colorimetric H 2 O 2 paper sensor was developed based on a new type of nanocomposites composed of Pd−Pt nanoparticles, hemin functionalized reduced graphene oxide (hemin-rGO) and carboxylated carbon nanotubes (CNTs-COOH). The proposed nanocomposites show a high peroxidase-like activity. It provides a sensitive platform showing a linear response toward H 2 O 2 in the range of 0.05–500 μM with a determination limit of 0.01 μM. Based on this, the composites were applied to construct a paper sensor for H 2 O 2 detection in real samples. The cost-effectiveness, simplicity and efficiency of this paper sensor could be developed for “point-of-care” analysis and other related areas.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
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IF 8.7
Xiaoming Qi,Wenjun Wang,Hongbo Dai,Yaofeng Zhu,Yubing Dong,Shao-Yun Fu,Qingqing Ni,Yaqin Fu
Shape memory polymer fibers (SMPFs) coated with conductive layers are attracting increasing attention in soft robots and wearable electronics. However, the thickness and poor stretchability of the conductive layer hinder its applications. Here, the multifunctional two-way shape memory reduced graphene oxide (RGO)/ethylene–vinyl acetate copolymer (EVA) composite yarn is designed following the “swelling-ultrasonicating” and one-step twisting procedures. These RGO/EVA composite fiber conductive paths connected with each other by constructing the helical conductive network. The RGO/EVA composite yarn presents excellent electro-thermal conversion performance and outstanding load-bearing capability, enabling controlled electro-driven reversible strain (more than 10% reversible strain) and high energy density (72.5 J/kg). Additionally, the composite yarn has great stretchability (130% strain), high strain sensing sensitivity (gauge factor of 7.3), large linear working range (up to 70% strain). This work provides an innovative manufacturing strategy for the RGO/EVA composite yarn with two-way shape memory, electro-driven actuation, and strain sensing performance.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Aijuan Xie,Haoye Wang,Jiaqi Lin,Jie Pan,Menglu Li,Jiaojie Wang,Shixin Jiang,Shiping Luo
In the current study, bimetallic-organic gel (ZrFe-MOGs) were rapidly prepared without using any toxic or harmful organic solvent , and new bimetallic oxide ZrFeO x were prepared by roasting ZrFe-MOGs directly. Then ZrFeO x nanoparticles were combined with 3D RGO/MWCNTs by a solvothermal method to synthesize 3D RGO/MWCNTs@ZrFeO x hybrid. Due to its three-dimensional structure, large electroactive surface area and more active sites, and excellent conductivity, the electrocatalytic activity of the modified electrode for the oxidation of dopamine (DA) and paracetamol (PAT) was effectively improved, and the overlap of anode peak due to their closer electrochemical oxidation potentials was solved. Under optimal conditions, the linear responses to DA and PAT were in the range of 1 − 12 μM, 12 − 180 μM and 1 − 14 μM, 14 − 190 μM, respectively. The detection limits (S/N = 3) for DA and PAT were 0.230 and 0.212 μM, respectively. The optimized 3D RGO/MWCNTs@ZrFeO x has good reproducibility, repeatability, stability, selectivity, and can be used to detect DA and PAT simultaneously. In addition, the proposed RGO/MWCNTs@ZrFeO x sensor exhibited a good recovery factor in the analysis of real drug and serum samples with a relative standard deviation of less than 5 %. Importantly, the electroactive area of 3D RGO/MWCNTs@ZrFeO x , and the 2 H + /2e - mechanism of DA and PAT oxidation on the surface of 3D RGO/MWCNTs@ZrFeO x were discussed, which provided a theoretical basis for further understanding of this redox process .
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高影响因子
NANO
·
2018
·
IF 1.1
Xuehua Liu,Bingning Wang,Jine Liu,Zhen Kong,Binghui Xu,Yiqian Wang,Hongliang Li
A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS 2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS 2 /RGO) is described. It was found that single-layered or double-layered MoS 2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS 2 /RGO composites delivered a high reversible capacity of 900 mAhg − 1 after 200 cycles at a current density of 200 mAg − 1 as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS 2 layers deposited onto RGO sheets.
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Energy Technology
·
2018
·Vol. 7
·期 5
·1800940
·
IF 3.175
Maofeng Zhang,Wenzhen Liu,Ran Han,Jun Xu,Zhenjie Sun,Jiaqin Liu,Yucheng Wu
The synthesis of an efficient and economically viable supercapacitor material with a large areal capacitance for miniaturized consumer electronics is still a major challenge. Herein, densely packed 3D flower-like NiCo 2 O 4 @NiMoO 4 /reduced graphene oxide (rGO) composites on Ni foam which can be directly utilized as a supercapacitor material are demonstrated. The overall electrochemical performance can be significantly enhanced by an increase in the packing density of 3D flower-like structure, highly porous spatial construction, and the synergistic effects of the three materials, which generates a larger areal capacitance of 9.41 F cm −2 and a superior cycling stability with 75% areal capacitance retention after 2000 charge–discharge cycles. This simple and low-cost supercapacitor material may have potential applications in energy storage devices.
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危险品化学品经营许可证（带存储）