Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 3
·1617-1628
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IF 11.9
Meng Ma,Wenqin Shao,Qindan Chu,Wenting Tao,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
With the strong support of the government for emerging technology industries, electromagnetic waves have brought convenience to people's lives, but also become an undeniable new source of pollution. Therefore, it is vital to develop new high-performance electromagnetic shielding materials. Herein, we designed a well-structured asymmetrical gradient multilayer composite film by constructing a controllable electromagnetic gradient. Using cellulose nanofibers as the matrix, a layer-by-layer filtration method was used to rationally distribute FeCo@rGO and MXene fillers to build an ordered multilayer structure that provides alternating conductive and magnetic gradients. Owing to gradient absorption shielding and reflection mechanisms for electromagnetic waves within the film layer, the EMI shielding efficiency (EMI SE) of the asymmetrical gradient alternating six-layer composite film reached 45.2 dB (X-band), and the reflection coefficient was reduced to 0.71 when 20 wt% filler was added. In addition, this composite film has good thermal conductivity and mechanical properties, exhibiting thermal conductivity of 2.90 W (m−1 K−1) and tensile strength of 26.2 MPa. This strategy provides a feasible approach for designing electromagnetic shielding composite materials with adjustable electromagnetic properties and has significant practical significance in expanding the application of MXene-based composite materials.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Xiaoli Wu,Yijun Liao,Lin Yao,Yunfeng Zha,Renjie Li,Yong Wang,Dewei Zhao,Site Mo,Wanxia Huang
To develop effective and convenient de/anti-icing methods for electric transmission-lines has remained to be a challenging task. Electrothermal material has emerged as a promising approach, but the investigation of electrothermal material with high breakdown voltage remains sluggish. Herein, a high electrothermal property and voltage resistant graphene/crosslinked polyethylene (XLPE) composite was prepared as a de/anti-icing material via an unconventional non-percolative structure. The isolated rGO sheets contribute to a record-high breakdown voltage of 1050–2600 V. The field emission at high voltage, resulted from the appropriate gap width between rGO sheets in non-percolated structure, enables these composites to generate electric currents and obvious temperature increases of 2–59.7 °C owing to Joule's effect. More importantly, the combined ideal heating performance and breakdown voltage enable the rGO-filled composites to achieve a high de-icing efficiency of 18 min and an effective anti-icing performance at −20 °C at 1100 V. These results pave the way to apply graphene/XLPE composites in transmission-lines de/anti-icing and other fields requiring joule heating at high voltage.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Shanshan Wu,Yefeng Feng,Kaidan Wu,Wenqin Jiang,Zhifeng Xue,Deping Xiong,Li Chen,Zuyong Feng,Kunhua Wen,Zhaoying Li,Miao He
Ti 3 C 2 /TiO 2 /rGO nanosheets were synthesized as anode materials for potassium ion batteries (KIBs) using modified Hummers, freeze drying, and thermal reduction in this paper. Layered Ti 3 C 2 /TiO 2 /rGO nanosheets were synthesized by in-situ formation of rGO and TiO 2 nanoparticles between Ti 3 C 2 layers. As one of the most important members of MXenes family, Ti 3 C 2 exhibits unique electronic characteristics, high specific surface area, strong electrical conductivity and chemically active surface, which can enhance electrode capacity. There are three ways to increase electrode conductivity and capacity: Firstly, rGO is applied as the substrate for the inlaying of TiO 2 and Ti 3 C 2 nanoparticles and nanosheets. Secondly, rGO may also buffer electrode volume changes during charging and discharging processes. In addition, the enormous surface area of rGO makes Ti 3 C 2 and TiO 2 nanoparticles dispersion well, and Ti 3 C 2 and TiO 2 nanoparticles can well separate rGO nanoparticles and prevent them from stacking up again. The synergistic effect of the three can efficiently relieve the stress and provide a rapid transport pathway between electrons and ions. The flake structure of Ti 3 C 2 /TiO 2 /rGO is advantageous to the stability of SEI film, which makes the material maintain good activity during charge and discharge process, and significantly increases its electrochemical performance. Therefore, Ti 3 C 2 /TiO 2 /rGO electrode has a high reversible capacity of 349.2 mAhg −1 after 200 cycles of 100 mAg −1 current, and a high stable capacity of 229.3 mAhg −1 after 500 cycles of 500 mAg −1 current, and has exceptional rate performance. The structure of Ti 3 C 2 /TiO 2 /rGO composite remains stable after 500 cycles, and no agglomeration occurs. The detailed reaction mechanism of Ti 3 C 2 /TiO 2 /rGO electrode as KIBs anode was analyzed by SEM, XRD , Raman, TGA , FT-IR, BET, TEM, XPS , EDS , CV, EX-situ XRD, ex-situ TEM, and so on. Therefore, it can be concluded that the Ti 3 C 2 /TiO 2 /rGO composite is an appropriate anode material for KIBs.
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CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Alan Meng,Xiaocheng Hong,Yue Zhang,Wenman Liu,Zhenhui Zhang,Liying Sheng,Zhenjiang Li
Research on flexible biosensors is mainly concentrated on their application in acquiring information on physical signals including temperature, pH, and so on. However, there are hardly any studies on using flexible biosensors for assaying biomolecules and biomarkers caused diseases. Herein, a free-standing flexible sensor is designed for H 2 O 2 sensing and cancer biomarker assaying, in which reduced graphene oxide and carbon nanotubes (rGO-CNT) flexible hybrid film is first obtained through self-assembly, then MnO 2 nanoflowers and Co nanospheres are anchored on rGO-CNT by electrodeposition . rGO-CNT has good flexibility and conductivity . MnO 2 uniformly distributed on rGO-CNT has excellent catalytic performance towards H 2 O 2 . Co not only improve the conductivity, but also supply a second active material for H 2 O 2 sensing. Profiting from these advantages, MnO 2 –Co/rGO-CNT sensor shows an expanded detection range, high sensitivity, low detection limit, excellent repeatability, reproducibility, stability and selectivity. Surprisingly, it can maintain 100% of the original signal after folding 100 times, indicating deformation stability. Moreover, it can real-time monitor H 2 O 2 released by HepG2 cells. The strategy of introducing flexible substrate material and transition metals as well as transition metal compounds provides new insight into the design of flexible electrodes and greatly promote the development of real-time detection of cancer biomarkers.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Ran Sui,Guangtao Zan,Ming Wen,Weina Li,Zihui Liu,Qingsheng Wu,YongQing Fu
Transition metal sulfides and oxides with high theoretical capacities have been regarded as promising anode candidates for a sodium-ion battery (SIB); however, they have critical issues including sluggish electrochemical kinetics and poor long-term stability. Herein, a dual carbon design strategy is proposed to integrate with highly active heterojunctions to overcome the above issues. In this new design, CoS2/CoO hollow dodecahedron heterojunctions are sandwiched between open framework carbon-spheres (OFCs) and a reduced graphene oxide (rGO) nanomembrane (OFC@CoS2/CoO@rGO). The CoS2/CoO heterojunctions effectively promote electron transfer on their surface and provide more electrochemical active sites through their hierarchical hollow structures assembled by nanodots. Meanwhile, the dual-carbon framework forms a highly conductive network that enables a better rate capability. More importantly, the dual carbon can greatly buffer volume expansion and stable reaction interfaces of electrode material during the charge/discharge process. Benefitting from their synergistical effects, the OFC@CoS2/CoO@rGO electrode achieves a high reversible capacity of 460 mAh g–1 at 0.05 A g–1 and still maintains 205.3 mAh g–1 even when current density is increased by 200 times when used as an anode material for SIBs. Their cycling property is also remarkable with a maintained capacity of 161 mAh g–1 after 3500 charging/discharging cycles at a high current density of 1 A g–1. The dual-carbon strategy is demonstrated to be effective for enhanced reaction kinetics and long-term cycling property, providing siginificant guidance for preparing other high-performance electrode materials.
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PubMed
高影响因子
JOURNAL OF CATALYSIS
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2022
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IF 8.047
Shudi Yu,Jin Li,Hui Zhang
A series of hierarchically structured hybrids Ni x Mg 3-x Al-LDH/rGO (LDH: layered double hydroxides, x = 1, 1.5 and 2, rGO: reduced graphene oxide) supported atomically precise Au n ( n = 25, 38 and 127) nanoclusters (NCs) catalysts Au n /Ni x Mg 3-x Al-280 were firstly prepared via a double pH-controlled electrostatic adsorption method using captopril-capped Au n NCs as precursors followed proper calcination . Detailed characterizations show that the as-obtained hierarchically structured Au n NCs catalysts possess the nanosheet array-like structure formed by the LDHs nanosheets (∼55–70 × 10 nm) interdigitated vertically grown on the both sides of rGO layers, and Au n NCs with size of 1.0–1.9 nm are mainly dispersed on the edge and cross-linking sites of LDH/rGO hybrid. All the hierarchically structured Au n NCs catalysts exhibit excellent catalytic activity for the solvent-free oxidation of benzyl alcohol without additional base, and the activities show a volcanic trend with increasing Ni/Mg ratios and gradually decrease with the increased Au atomicities in Au n clusters. The highest TOF value of 5118 h −1 for the Au 25 /Ni 1.5 Mg 1.5 Al-280 can be ascribed to the smallest Au 25 NCs containing the Au 0 /Au δ+ -Ni 2+ /Mg 2+ –OH interface with the highest Au δ+ /(Au 0 + Au δ+ ) ratio, and the strongest Au 25 −LDH/rGO synergistic interaction along with hierarchical nanosheet array-like structure facilitating the transmission and diffusion of the reactants. The present work provides a new idea for preparing the hierarchically structured LDH/rGO hybrid supported metal nanoclusters catalysts with high-performance for various catalytic applications.
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Nanoscale
·
2022
·Vol. 14
·期 34
·12313-12321
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IF 8.307
Yanying Cui,Linan Xu,Haitao Li,Xuan Wang,Fuwei Sun,Huan Wang,Xinguang Guo,Yihe Zhang,Hongbo Gao,Qi An
Surface-enhanced Raman scattering (SERS) is a rapid and promising detection technique for trace molecules. A central goal of research in this area is to achieve the highly sensitive detection of molecules built on a systematic understanding of enhancement mechanisms. Herein, we develop a Ag cluster@rGO composite nanostructure, which utilizes strong molecular adsorption to achieve ultrahigh SERS sensitivity. Ag clusters are prepared without additional reducing agents, leaving a low carbon footprint in the fabrication process. Finite-difference time-domain (FDTD) simulations show strong electromagnetic field enhancements generated at the edges and interstices of Ag clusters due to the specificity of their structure. Density Functional Theory (DFT) calculations show that the HOMO–LUMO energy gap value is significantly reduced when Ag cluster@rGO forms a composite system with the target molecule, which enables efficient charge transfer between the substrate and molecules, resulting in charge transfer enhancement. A detection limit of 10−14 M using our substrate can be achieved for the environmental pollutant dye rhodamine 6G (Rh6G). The detection limits of bisphenol A (BPA) and its derivatives reach nanomolar levels with good signal stability. More importantly, we demonstrate the ability to rapidly screen BPA migration in Chinese Baijiu. Our SERS platform can be further developed for environmental pollution control and food safety.
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ACS Applied Electronic Materials
·
2022
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IF 4.494
Shuimiao Xia,Kuan Chen,Kelan Yan,Liming Shen,Meiyu Zhang,Zhicheng Shi,Runhua Fan
Polymer dielectric composites are extensively used in modern electronic devices because of their extremely high power density. However, unfavorable coupling between breakdown strength and dielectric permittivity can make achieving high energy density a challenge. In this study, reduced graphene oxide @ barium titanate (RGO@BTO) hybrid nanosheets have been fabricated and utilized as fillers in the design of RGO@BTO/P(VDF-HFP) single-layer films. An increase in permittivity to 24.8@10 kHz, i.e., equivalent to 253% of the P(VDF-HFP) (∼9.8@10 kHz) matrix, has been achieved with only 1 wt % RGO@BTO nanofillers due to the formation of microcapacitors. Furthermore, the RGO@BTO/P(VDF-HFP) film is hot-pressed with a PEI film and a P(VDF-HFP) film, forming a trilayer structure. Consequently, this trilayer film displays a high breakdown strength of 478 kV/mm, a high energy density of 8.25 J/cm3, and a satisfactory efficiency of 64.3%. Thus, this study provides an efficient route for designing polymer composites that combine high energy density with high permittivity.
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RSC Advances
·
2022
·Vol. 12
·期 32
·20838-20849
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IF 4.036
Hanzhang Ye,Yongli Ding,Tingting Liu,Jiani Li,Qi Wang,Yuhao Li,Jingjing Gu,Zhanen Zhang,Xuedong Wang
Traditional bimetallic sulfide-based nanomaterials often have a small specific surface area (SSA), low dispersion, and poor conductivity, thereby limiting their wide applications in the nanozyme-catalytic field. To address the above issues, we herein integrated NiCo2S4 with N,S-rGO to fabricate a nanocomposite (NiCo2S4@N,S-rGO), which showed a stronger peroxidase–mimetic activity than its pristine components. The SSA (155.8 m2 g−1) of NiCo2S4@N,S-rGO increased by ∼2-fold compared to NiCo2S4 with a pore size of 7–9 nm, thus providing more active sites and charge transfer channels. Based on the Michaelis–Menten equation, the affinity of this nanocomposite increased 40% and 1.1∼10.6-fold compared with NiCo2S4 with N,S-rGO, respectively, highlighting the significant enhancement of the peroxidase-like activity. The enhanced activity of this nanocomposite is derived from the joint participation of ˙OH, ˙O2−, and photogenerated holes (h+), and was dominated by h+. To sum up, N,S-codoping, rich S-vacancies, and multi-valence states for this nanocomposite facilitate electron transfer and accelerate reaction processes. The nanocomposite-based colorimetric sensor gave low detection limits for H2O2 (12 μM) and glucose (0.3 μM). In comparison with the results detected by a common glucose meter, this sensor provided the relative recoveries across the range of 97.4–101.8%, demonstrating its high accuracy. Moreover, it exhibited excellent selectivity for glucose assay with little interference from common co-existing macromolecules/ions, as well as high reusability (>6 times). Collectively, the newly developed colorimetric sensor yields a promising methodology for practical applications in H2O2 and glucose detection with advantages of highly visual resolution, simple operation, convenient use, and satisfactory sensitivity.
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MATERIALS RESEARCH INNOVATIONS
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2022
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IF 0
Shridevi Salagare,Prashanth Shivappa Adarakatti,Suma B P,Yarradoddappa Venkataramanappa
A nitrite sensing platform has been constructed using a TiO2-reduced graphene oxide (RGO) nanocomposite incorporated into a glassy carbon electrode. Reduced graphene oxide is integrated in a simple technique for the manufacture of titanium dioxide (TiO2). Spectroscopic and electrochemical techniques have all been used to characterise the TiO2- RGO nanocomposite. In 3 mM and pH 6.0 phosphate buffer solutions, the TiO2-reduced graphene oxide nanocomposites tailored glassy carbon electrode demonstrated outstanding electro-catalytic nitrite oxidation activity. The square root of scan rate is also proportional to the oxidation peak current, showing that the nitrite redox reaction involves a diffusion-controlled mechanism. Using linear sweep voltammetry, the sensitivity and detection limit for nitrite at the modified electrode were determined to be 4.853 μA/μM cm2 and 0.006 µM respectively, over a concentration range of 10 - 2000 µM. Further, the nanocomposite is used to measure NO2- in water and buttermilk samples quantitatively.
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ENERGY & FUELS
·
2022
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IF 4.654
Bin Liu,Songlin Xue,Shifeng Tan,Duxin Zhang,Zhao Deng,Hongfei Pan,Wenmao Tu,Ruiming Zhang,Haining Zhang,Yadong Wang
In this work, a two-step calcination method to fabricate Co3O4@CoP hollow nanoparticles embedded in N, S-co-doped reduced graphene oxide substrates is reported. The electrocatalyst is synthesized through a hydrothermal-calcination method of adding graphene oxide using ZIF-67 as a template followed by an annealing process in the presence of NaH2PO4·H2O. In the designed electrocatalyst, the formed hollow nanoparticles had an average diameter of 100 nm. The synthesized electrocatalyst displays a hydrogen evolution reaction overpotential of 54 mV at 10 mA cm–2 current density in 0.5 mol L–1 H2SO4 solution at room temperature, comparable to Pt/C catalysts. The oxygen evolution reaction overpotential in 1 mol L–1 KOH electrolyte is 288 mV, which is almost equivalent to that of IrO2. Stated thus, the as-prepared composite catalysts are promising candidates for bifunctional catalysts for water splitting technology, relieving the limitation of commercial catalysts caused by their single catalytic performance.
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ELECTROCHIMICA ACTA
·
2022
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IF 7.336
Yuting Zhong,Yalan Hu,Han Mo,Zhirui Wu,Xin Fu,Liqun Zhou,Hongying Liu,Ling Li,Xiaoguang Liu
A wrinkled rGO modified nanorod gallium oxides (Ga 2 O 3 ) anchored PdPb nanoalloys composite (PdPb@rGO/Ga 2 O 3 ) was prepared using GO/Ga-MOF as the precursor by facile hydrothermal, calcination and reduction approach, and then applied as an electrocatalyst for alcohols electrooxidation. Electrochemical tests show that the fabricated PdPb@rGO/Ga 2 O 3 exhibits superior electrocatalytic activity and high anti-CO poisoning capability for methanol, ethanol and ethylene glycol oxidation reactions (MOR, EOR and EGOR), outperforming Pd@rGO/Ga 2 O 3 and commercial Pd/C. Specifically, the bimetallic electrocatalyst owns the highest forward peak current density of 115.84 mA cm −2 , 146.97 mA cm −2 and 226.59 mA cm −2 , which is 4.69, 5.08 and 8.38 times of Pd/C for MOR, EOR and EGOR, respectively. After 3600 s CA test, the retained current density of PdPb@rGO/Ga 2 O 3 achieves the initial 59.24%, 71.13% and 81.71% towards MOR, EOR and EGOR, respectively. The remarkable performance is attributed to the electronic effects of PdPb nanoalloys, which can improve the electronic structure of Pd d-band, while the surface decoration of Pb/PbO NPs can dramatically adsorb more oxy-species and accelerate the oxidative removal of CO (ads) . Moreover, the oxidation mechanisms of three alcohols and the removal processes of CO (ads) on the Pd surface are analyzed in detail.
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