Nano Energy
·
2021
·
IF 17.881
Pengfei Yan,Liang Ji,Xiaopeng Liu,Qinghua Guan,Junling Guo,Yonglong Shen,Haijun Zhang,Weifeng Wei,Xinwei Cui,Qun Xu
2D heterostructures offer a great opportunity in seeking high-performing energy storage materials ; however, performance ceiling exists, limited by their van-der-Waals (vdW) interactions. Here, we explore a novel 2D, amorphous MoO 3−x (aMoO 3−x ) on Ti 3 C 2 -MXene, non-vdW heterostructure via a facile synthesis route. Density functional theory computations suggest that the non-vdW heterostructure can strongly stabilize aMoO 3−x while maintaining electrical conductivity at a high level. Facile 2D Li-ion diffusion can then be achieved in the restacked 2D non-vdW heterostructures due to the weakened interactions between two defective MoO 3−x layers, leading to a capacitor-like interlayer diffusion reaching a large capacity of 426 C g −1 on the surface of the amorphous layer and a diffusion-controlled intralayer diffusion of 546 C g −1 within the amorphous layer. These characteristics optimize Li-ion storage kinetics while achieving full capacities of amorphous materials with high stability. This work might offer a feasible platform of 2D non-vdW heterostructures for boosting and understanding Li-ion storage performance.
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高影响因子
Science Bulletin
·
2021
·
IF 11.78
Yibing Bu,Taoyu Shen,Wenke Yang,Shiyin Yang,Ye Zhao,Hu Liu,Yanjun Zheng,Chuntai Liu,Changyu Shen
With the rapid development of wearable intelligent devices, low-cost wearable strain sensors with high sensitivity and low detection limit are urgently demanded. Meanwhile, sensing stability of sensor in wet or corrosive environments should also be considered in practical applications. Here, superhydrophobic microcracked conductive paper-based strain sensor was fabricated by coating conductive Ti 3 C 2 T x MXene on printing paper via dip-coating process and followed by depositing superhydrophobic candle soot layer on its surface. Owing to the ultrasensitive microcrack structure in the conductive coating layer induced by the mismatch of elastic modulus and thermal expansion coefficient between conductive coating layer and paper substrate during the drying process, the prepared paper-based strain sensor exhibited a high sensitivity (gauge factor, GF = 17.4) in the strain range of 0–0.6%, ultralow detection limit (0.1% strain) and good fatigue resistance over 1000 cycles towards bending deformation . Interestingly, it was also applicable for torsion deformation detection, showing excellent torsion angle dependent, repeatable and stable sensing performances. Meanwhile, it displayed brilliant waterproof, self-cleaning and corrosion-resistant properties due to the existence of micro/nano-structured and the low surface energy candle soot layer. As a result, the prepared paper-based strain sensor can effectively monitor a series of large-scale and small-scale human motions even under water environment , showing the great promising in practical harsh outdoor environments . Importantly, it also demonstrated good applicability for spatial strain distribution detection of skin upon body movement when assembled into electronic-skin (E-skin). This study will provide great guidance for the design of next generation wearable strain sensor.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Xu,Dong Zhu,Wen Zhu,Fengzhan Sun,Jianxin Zou,Richard M. Laine,Wenjiang Ding
Rechargeable magnesium sulfur batteries (MSBs) assembled with earth-abundant and safe Mg anodes less prone to form dendrites on surface and sulfur-containing cathodes offer considerable potential for high energy densities. Nevertheless, suitable sulfur host materials and electrolytes are at present key factors that retard commercial introduction. Here, we explore preparation of Ti 3 C 2 @CoO composites as sulfur hosts with high concentration electrolytes consisting of Mg(TFSI) 2 and AlCl 3 in diglyme as new types of MSBs. Density functional theory (DFT) simulations indicate that CoO adsorbs magnesium polysulfides more strongly than Ti 3 C 2 while Ti 3 C 2 is more conductive to Mg 2+ diffusion and transfer than CoO. Coincidentally, use of 1 M electrolyte restrains dissolution of magnesium polysulfides in electrolytes during battery cycling. The experiments indicate that combining Ti 3 C 2 @CoO sulfur hosts and 1 M Mg(TFSI) 2 /AlCl 3 /diglyme electrolyte provides viable MSBs, maintaining discharge capacities of 540 mAh g −1 after 70 cycles at 100 mA g −1 . Mechanistic studies indicate that these MSBs work via a S/MgS x ( x = 2–8) redox process although oxidation of polysulfide to sulfur is not efficient in initial cycling. The systems studied here may offer valuable insights and inspiration in the design of appropriate electrolytes and sulfur-host materials for MSBs.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Zehui Fan,Chen Zhang,Wuxing Hua,Huan Li,Yan Jiao,Jingyi Xia,Chuan-Nan Geng,Rongwei Meng,Yingxin Liu,Quanjun Tang,Ziyang Lu,Tongxin Shang,Guowei Ling,Quan-Hong Yang
Lithium-Sulfur (Li-S) batteries with high theoretical energy density are promising energy storage systems in the next decades, while the lithium polysulfides (LiPSs) shuttling caused by the sluggish sulfur redox reaction severely lowers the practical performance. The use of interlayer between the cathode and separator has been widely investigated to physically or chemically block the LiPSs, while the introduction of catalytic materials is a more effective strategy to accelerate the conversion of LiPSs. MXene with rich surface chemistry has shown its potential for facilitating the catalytic conversion, however, the aggregation of MXene sheets usually leads to the loss of the catalytic active sites. Herein, we report a diatomite/MXene (DE/MX) hybrid material as the bifunctional interlayer for improving the adsorption/conversion of LiPSs in Li-S batteries. The diatomite with porous structure and rich silica-hydroxyl functional groups could trap LiPSs effectively, while prevent the aggregation of MXene. The DE/MX based interlayer showed bifunctions of enhancing the chemical adsorption and promoting the conversion of LiPSs. The Li-S batteries with the DE/MX interlayer delivered an improved cycling stability with a low capacity decay of 0.059% per cycle over 1000 cycles at 1.0 C. Moreover, stable 200 cycles can be realized with a high sulfur loading electrode up to 6.0 mg cm −2 . This work provides an effective strategy to construct bifunctional interlayers for hindering the shuttling of LiPSs and boosting the practical application of Li-S batteries.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Krishnamoorthy Rajavel,Xuecheng Yu,Pengli Zhu,Yougen Hu,Rong Sun,Chingping Wong
Tunable Electromagnetic Interference (EMI) shielding behaviors of 2D MXene (Nb 2 CT x ) were explored via different exfoliation conditions. Stacked, lamellar few-layer, oxygen-related surface functional groups, and structural defects along with oxidative products of Nb 2 CT x were identified by tuning chemical etching conditions during one-step exfoliation process. Exfoliation of Nb 2 CT x with a tightly packed stacked structure remarked at lower etching times. The unpacking of Nb 2 CT x into lamellar morphology followed by separated few-layer Nb 2 CT x remarked at moderate etching time, whereas structural misalignment, defects, and oxidation of Nb 2 CT x occurred during prolonged chemical etching times. Synergistic effect of one-step extracted few-layers and lamellar structured Nb 2 CT x favorably enrich the assembly of multiple electrical conductive pathways responsible for absorption dominated EMI shielding performance in X- and Ku-band region. The assembled wax nanocomposites with 80% of Nb 2 CT x loading exfoliated at 100 h etching time at a thickness of 1 mm exhibited EMI shielding effectiveness of about 44.09 ± 1.99 dB at 12 GHz, and its EMI attenuation mechanism explained by conduction and eddy current loss. The combined action of few-layer and lamellar Nb 2 CT x nanostructures could be interesting for making novel shielding materials; open a new avenue for niobium series in the MXene family for elaborated applications.
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高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Zheng Bo,Kexin Yi,Huachao Yang,Xinzheng Guo,Zhesong Huang,Zhouwei Zheng,Jianhua Yan,Kefa Cen,Kostya (Ken) Ostrikov
Ever-increasing mass loading of transition metal oxides (TMOs) yields high pseudocapacitance in laboratory electrochemical capacitors . However, their performance based on whole electrode mass is still far from industry standards. Highly-promising solution based on loading TMOs into 3D porous electrodes causes a yet unresolved challenge to find ways to achieve ultimate energy storage by atomically precisely loading less active material. Inspired by single-atom catalysis, we propose a new “ more from less but precise ” concept of homogeneously dispersing a common MnO 2 TMO via atomic sites to maximize atom redox reaction efficiency for industry-relevant pseudocapacitance. The concept is materialized by multifunctional MXene aerogel with super-hydrophilicity and surface functional groups, which provides 3D atomic nucleation sites to homogeneously load in-situ -formed, covalently-bonded MnO 2 nanosheets . The gravimetric capacitance of MnO 2 is largely enhanced, yielding superior pseudocapacitance of >400 F/g at > 5 mg/cm 2 that is typically achieved at 10 times lower loadings. Outstanding electrode areal capacitance is achieved using 2–3 times less MnO 2 mass, demonstrating industry-relevant pseudocapacitance almost twice higher than in state-of-the-art devices. MnO 2 /MXene//MXene asymmetric supercapacitor shows practically-high energy (~50.1 Wh/kg) and power (~10.0 kW/kg) densities, among the best MnO 2 pseudocapacitors . Capacitive-mechanism-controlled redox reactions, rarely achievable in diffusion-controlled porous pseudocapacitive electrodes, are revealed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Qihuang Deng,Furong Zhou,Maolin Bo,Yefeng Feng,Yuehao Huang,Cheng Peng
High dielectric response and electric insulation are desired in high-energy-density polymer/ceramic composites. Low dielectric response is found in polymer composites with semiconductors. To balance a high dielectric constant and breakdown strength, in this work, the polymer-based composites with de novo synthesized V 2 C MXene-CuO hybrid-particles were fabricated. High dielectric response of composites was attributed to strong electron polarization at ceramic/ceramic heterojunction. High insulation was ascribed to fluorine-induced electron-trap effect. The first principle calculations verified the electron-transfer mechanism at V 2 C/CuO van der Waals heterojunctions. Compared with polymer/CuO binary composites, polymer/V 2 C-CuO ternary composites exhibited the improved comprehensive electric properties (remarkably improved dielectric response and slightly damaged insulation). Ternary composite with 10 wt% V 2 C-CuO showed a high dielectric constant of 89, low dielectric loss of 0.23, low conductivity of 6.8 × 10 −7 S m −1 at 100 Hz and high breakdown strength of 204 MV m −1 . This study might enable a facile preparation of cutting-edge nanocomposite dielectrics.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Yan-Jun Wan,Krishnamoorthy Rajavel,Xing-Miao Li,Xiao-Yun Wang,Si-Yuan Liao,Zhi-Qiang Lin,Peng-Li Zhu,Rong Sun,Ching-Ping Wong
Ti 3 C 2 T x MXene with two-dimensional (2D)-layered structure shows potential application in various fields owing to its superb metallic conductivity and excellent solution processability. However, a fundamental challenge limiting the implementation of Ti 3 C 2 T x in practical applications is its susceptibility to oxidation in either humid or aqueous environments only within a few days, which results in the disassembly of the 2D-layered structure and severely deteriorates the functional properties including electrical conductivity, mechanical strength and EMI shielding performance. Herein, we firstly demonstrate a robust procedure to protect sensitive Ti 3 C 2 T x from degradation by modification with imidazolium-based inion liquid (IL), which remarkably improves the chemical stability of Ti 3 C 2 T x in aqueous and significantly increases the mechanical strength of assembled freestanding Ti 3 C 2 T x film (IL-MXene). The crystalline structure of IL-MXene sheet remains intact up to 30 days and preserves the 2D-layered structure as long as 8 months in aqueous, meanwhile, the tensile strength of freestanding IL-MXene film is as high as 75.9 ± 4.9 MPa and the increment is up to 84% when compared to that of untreated MXene film (41.2 ± 4.5 MPa). A novel mechanism for improved chemical stability of MXene sheet was proposed and elucidated based on the radical-scavenging ability of IL and the surface chemistry of MXene sheet. This study provides a new strategy to achieve chemically stable Ti 3 C 2 T x and improved mechanical strength of assembled MXene film, which is also available for other type of MXenes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jiayi Ai,Jianbin Li,Kai Li,Fei Yu,Jie Ma
Self-healing materials show great application potential in the field of flexible energy storage and wearable devices due to their special properties. Here, a self-healing material, application in Capacitive deionization for the first time is reported, which could autonomously self-healing damaged interfaces. We fabricated that hydrogel (MNH) composites incorporating MXene (Ti 3 C 2 T x ) by dynamic poly(vinylalcohol)-based network cross-linked by diol-borate ester bonding. The material fast restores its configuration, mechanical properties, and capacitive performances during after healing and shift different shape in the actual application environment transformation. The MNH electrode has good mechanical properties, self-healing efficiency is as high as 92%, the electrochemical healing properties is of 95.8%. The feasibility of its application in capacitive deionization was proved. The electrode performed a salt adsorption capacity of about 51 mg/g at a current density of 10 mA·g −1 and a voltage window of 1 V and showed excellent cyclic stability. Our work expands the application scenarios of self-healing materials and provides a promising approach for the development of capacitive deionizing electrodes with good self-healing properties and long life.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6814-6829
·
IF 4.22
Zeng Guangyong,Lin Qingquan,Wei Ke,Liu Yongcong,Zheng Size,Zhan Yingqing,He Shuangjiang,Patra Tanmoy,Chiao Yu-Hsuan
With unique structural and physicochemical properties, the upcoming two-dimensional (2D) materials have become promising candidates for the design and fabrication of high-performance membranes. In this work, for the first time, the dopamine-functionalized graphene oxide (DGO) nanosheets were intercalated into the MXene (Ti 3 C 2 T x ) nanosheets, and subsequently, a series of novel DGO/MXene composite membranes were prepared via vacuum filtration on hydrophilic polyvinylidene fluoride (PVDF) membranes as the support layer. The effect of mass ratios between DGO and MXene on the resulting membrane structure and overall performances were systematically investigated in detail. Incorporation of DGO increased the mechanical stability of composite membrane, but reduced its interlayer spacing. The most suitable composite membrane, M4 (MXene: DGO = 1:2) with nearly 2 µm thickness of functional layer, exhibited an excellent dye rejection ratio 98.1% (for Direct Red 28) and 96.1%( for Direct Black 38) as along with a high value of water flux (63.5 Lm −2 h −1 ) at a pressure of 0.1 MPa, compared with the pure MXene and DGO membranes. Furthermore, molecular dynamics (MD) simulation indicated that the permeation rate of water molecules across the active layer was directly determined by the interlayer spacing of nanosheets. Additionally, composite membrane M4 displayed a relatively low rejection ratio of differently charged salts (9.7% for Na + ) and (4.3% Mg 2+ ).
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ACS Nano
·
2021
·
IF 15.881
Xiaodong Zhu,Ziyi Cao,Wenjie Wang,Haijing Li,Juncai Dong,Shangpeng Gao,Dongxiao Xu,Lei Li,Jianfeng Shen,Mingxin Ye
Mn-based aqueous zinc-ion batteries (ZIBs) are promising candidate for large-scale rechargeable energy storage because of easy fabrication, low cost, and high safety. Nevertheless, the commercial application of Mn-based cathode is hindered by the challenging issues of low rate capability and poor cyclability. Herein, a manganese–vanadium hybrid, K–V2C@MnO2 cathode, featured with MnO2 nanosheets uniformly formed on a V2CTX MXene surface, is elaborately designed and synthesized by metal–cation intercalation and following in situ growth strategy. Benefiting from the hybrid structure with high conductivity, abundant active sites, and the synergistic reaction of Mn2+ electrodeposition and inhibited structural damage of MnO2, K–V2C@MnO2 shows excellent electrochemical performance for aqueous ZIBs. Specifically, it presents the high specific capacity of 408.1 mAh g–1 at 0.3 A g–1 and maintains the specific capacity of 119.2 mAh g–1 at a high current density of 10 A g–1 in a long-term cycle of up to 10000 cycles. It is superior to almost all reported Mn-based cathodes for ZIBs in the aqueous electrolyte. The superior electrochemical performance suggests that the Mn-based cathode materials designed in this work can be a rational approach to be applied for high-performance ZIBs cathodes.
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高影响因子
ACS Nano
·
2021
·
IF 15.881
Junming Cao,Ziqi Sun,Junzhi Li,Yukun Zhu,Zeyu Yuan,Yuming Zhang,Dongdong Li,Lili Wang,Wei Han
As a typical family of two-dimensional (2D) materials, MXenes present physiochemical properties and potential for use in energy storage applications. However, MXenes suffer some of the inherent disadvantages of 2D materials, such as severe restacking during processing and service and low capacity of energy storage. Herein, a MXene@N-doped carbonaceous nanofiber structure is designed as the anode for high-performance sodium- and potassium-ion batteries through an in situ bioadsorption strategy; that is, Ti3C2Tx nanosheets are assembled onto Aspergillus niger biofungal nanoribbons and converted into a 2D/1D heterostructure. This microorganism-derived 2D MXene-1D N-doped carbonaceous nanofiber structure with fully opened pores and transport channels delivers high reversible capacity and long-term stability to store both Na+ (349.2 mAh g–1 at 0.1A g–1 for 1000 cycles) and K+ (201.5 mAh g–1 at 1.0 A g–1 for 1000 cycles). Ion-diffusion kinetics analysis and density functional theory calculations reveal that this porous hybrid structure promotes the conduction and transport of Na and K ions and fully utilizes the inherent advantages of the 2D material. Therefore, this work expands the potential of MXene materials and provides a good strategy to address the challenges of 2D energy storage materials.
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