CELLULOSE
·
2021
·Vol. 28
·期 7
·4281-4293
·
IF 5.044
Zhang Tianmeng,Zhang Weiwei,Xi Huan,Li Qingqing,Shen Mingxia,Ying Guobing,Zhang Jianfeng
Incorporation of nanoparticles into a three-dimensional porous framework to enhance adsorption capacity and recyclability of nanomaterial is of great significance for water contamination removal. Herein, a functionalized cellulose/MXene composite aerogel is prepared by the oxidative self-polymerization of dopamine hydrochloride and freeze-drying, which exhibits an excellent adsorption performance for methylene blue (MB). Characterization results show the successful combination of PDA and Ti 3 C 2 T x into the cellulose aerogel with merits of light weight, high structural stability and high porosity. The adsorption process is understood more deeply through the adsorption kinetics. The Langmuir isotherm model was used to better fit the adsorption process, and the maximum adsorption capacity for MB reaches 168.93 mg g −1 . Such a superior adsorption ability for MB is maintained in salt-containing water, or even a little higher when the concentration of NaCl is above 3%, recommending the functionalized cellulose/MXene composite aerogel for efficient removal of dyes in high-salt water environment.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yafeng Chen,Heliang Yao,Fantao Kong,Han Tian,Ge Meng,Shuize Wang,Xinping Mao,Xiangzhi Cui,Xinmei Hou,Jianlin Shi
Oxygen evolution reaction (OER) is a pivotal electrochemical reaction process for many renewable energy technologies. Due to the sluggish OER kinetics, searching for efficient low-cost non-precious metal catalysts is one of the crucial but very challenging steps. Herein, V 2 C MXene synergistically coupled with hypophosphite-intercalated FeNi (oxy)hydroxide (H 2 PO 2 − /FeNi-LDH-V 2 C) electrocatalyst is synthesized. The H 2 PO 2 − /FeNi-LDH-V 2 C exhibits excellent OER performance with an overpotential of 250 mV (η 10 ) and small Tafel slope of 46.5 mV dec −1 in 1.0 M KOH electrolyte, and excellent rechargeable Zn-air battery performance with superior open circuit potential (1.42 eV), power density (137 mW cm −2 ) and well durability. The strong interaction and electronic coupling with prominent charge-transfer between FeNi-LDHs and V 2 C MXene endow the composite significant OER performance and structural stability, and the adsorption/desorption balance for the OER reaction pathway, eventually promoting the intrinsic activity. This work demonstrates the great promise of MXene-based nanohybrids as advanced electrocatalysts for renewable energy applications.
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COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Yang Dai,Xinyu Wu,Zhangshuo Liu,Hao-Bin Zhang,Zhong-Zhen Yu
The increasingly severe electromagnetic pollution calls for high-performance microwave absorption materials . Lightweight, robust and porous MXene/polyimide (MP) aerogels with reversible compressibility , anisotropic pressure sensitivity and microwave absorption performances are fabricated by interface-reinforcement and bidirectional-freezing approach. The interfaces between MXene sheets are effectively reinforced by incorporated polyimide while anisotropic wave-like lamellar architectures are constructed during the bidirectional-freezing process due to the generated dual temperature-gradients. The highly anisotropic aerogel exhibits obvious higher mechanical strength and electrical conductivity along the lamella direction, but better elasticity and less energy dissipation in the normal direction. The reversibly compressible porous MP architecture not only delivers steady and repeatable electrical resistance response, but also presents long-term discernible direction-dependent pressure sensitivity for 1000 loading-release cycles at a strain of 50%. The anisotropic and porous architecture benefits microwave absorption. The structure optimization yields tunable effective absorption bandwidth (EAB) in a range of 3.9–18 GHz. Particularly, the MP aerogel shows the best EAB of 6.5 GHz for reported MXene-based microwave absorbers at only 1.91 mm, and the EAB covers the whole X-band for an aerogel with a thickness of 2.57 mm. These promising characteristics make the interfacially reinforced anisotropic MXene aerogels applicable for wearable piezoresistive devices and microwave absorbing materials.
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高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 36
·5995-6002
·
IF 3.117
Hui Zong,Le Hu,Zhenguo Wang,Ke Yu,Shijing Gong,Ziqiang Zhu
In this work, we present an interfacial superassembly by engineering MoSe2 nanoflowers coupled with ribbon-like Ti2N MXene frameworks (MoSe2@Ti2N MXene). The MoSe2@Ti2N MXene hybrids have excellent electrochemical performance and are used as anode materials for lithium-ion batteries (LIBs). Etching the Ti2AlN precursor under different conditions results in two kinds of novel materials with different morphologies: sliced etched-Ti2N and ribbon-like Ti2N MXene. Electrochemical analysis indicates that the ribbon-like Ti2N MXene frameworks not only help to avoid side reactions on carbides in LIBs, but also contribute to the outstanding rate capacity and superior specific capacity, thus achieving ultra-stable long-life cycling performance. The distinctive flower-like MoSe2 can be assembled onto the ribbon-like Ti2N MXene substrate by the interfacial superassembly. The MoSe2@Ti2N MXene electrode reveals a reversible specific capacity of 826 mAh g−1 at a current density of 0.1 A g−1 after 200 cycles. It maintains a capacity of 489 mAh g−1 after 2000 cycles at 1.0 A g−1 indicating satisfactory cycling stability. The new-type interfacial superassembly can provide a novel synthesis strategy for anode electrodes to improve the performance of LIBs.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Krishnamoorthy Rajavel,Shuyi Shen,Tao Ke,Daohui Lin
The present study addresses the establishment of a highly reactive catalyst derived from Ti 3 C 2 T x (MXene), which is a graphitic carbon-supported TiO 2 hybrid nanostructure for photocatalytic and bacteriostatic applications. The graphitic carbon-supported TiO 2 nanoparticles, which were placed onto a Ti 3 C 2 T x backbone as ternary hybrids under the controlled oxidation of isopropylamine delaminated Ti 3 C 2 T x , were demonstrated to be semiconducting nanostructures. Beneficially, the oxygen-related vacancies in TiO 2 along with graphitic carbon support in the metallic Ti 3 C 2 T x heterostructures exhibited distinct methylene blue dye degradation under UV irradiation at a rate constant of ( k ) of 0.035 ± 0.003 min −1 . The demonstrated superior catalytic performance of the assembled hybrid structure was attributed to the formation of multiple interfacial junctions formed by graphitic carbon, TiO 2 nanoparticles, and Ti 3 C 2 T x , which created distinct intermediate energy levels for electron-hole pair separation and improved the catalytic performance. The synthesized hybrid nanostructures also exhibited excellent antibacterial activity; approximately 97.4% of E. coli was killed by the nanostructures under light exposure due to the excessive radicals that caused oxidative stress on bacterial cells. The developed hybrid nanostructures from the controlled oxidation of delaminated Ti 3 C 2 T x are expected to be superior materials for photocatalytic and bacteriostatic applications.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Xueyu Yuan,Jing Jiang,Huawei Wei,Chengce Yuan,Mingqiang Wang,Dawei Zhang,Li Liu,Yudong Huang,Guo-Lin Gao,Zaixing Jiang
Thermoplastic resins have contributed more and more to the field of fiber reinforced composites . The ability to fabricate fiber reinforced thermoplastic resin composites with excellent and functional interface performances has so far been elusive. Herein, we use a polyamide-imide (PAI)/Ti 3 C 2 T x MXene sizing to enhance the interfacial performance of CF reinforced polyetheretherketone (PEEK) composites. The composite sizing makes the composite with high interfacial adhesion and electromagnetic interference (EMI) shielding performances. Our results indicate that traditional composite materials can improve performance and increase functionality through interface treatment.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Wenhua Cheng,Yan Zhang,Wenxiang Tian,Jiajia Liu,Jingyi Lu,Bibo Wang,Weiyi Xing,Yuan Hu
In this work, a highly efficient flame retardant and electromagnetic interference (EMI) shielding coating on cotton fabric was fabricated by a simple solution impregnation and dip-coating method, which involved three layers of polyacetimidate (PEI), ammonium polyphosphate (APP), and Ti3C2Tx. When exposed directly to flame, the PEI/APP coating lead to a char layer resulting in self-extinguishing performance. Particularly, the cotton fabric coated by increasing amounts of Ti3C2Tx gradually achieved EMI shielding performance. When the Ti3C2Tx sheets content was 5.2 mg/cm2, a high electrical conductivity of 670.3 S·m–1 and a EMI shielding effectiveness of 31.04 dB were achieved in the X-band with an absorption-dominated mechanism. Besides, such modified cotton fabric also has the potential to be used as an electrical heating material. The temperature could even reach up to about 64.3 °C under an applied voltage of just 4 V. Therefore, this work provided a feasible idea for preparing multifunctional fabrics.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2020
·
IF 6.444
Chuanxin Weng,Tianle Xing,Hao Jin,Guorui Wang,Zhaohe Dai,Yongmao Pei,Luqi Liu,Zhong Zhang
MXene-based materials have been widely studied recently for effective electromagnetic interference (EMI) shielding due to the prominent intrinsic electrical conductivity . Nevertheless, the poor mechanical performance of pure MXene films limits the practical application in EMI shielding. Thus, we integrate MXene with aramid nanofiber (ANF) to develop a composite film with layered structure through a simple vacuum-assisted filtration method. The resulting ANF/MXene (20/80) composite exhibits a high electrical conductivity of 879.0 S/cm, EMI shielding effectiveness (SE) of 40.6 dB and specific SE (SSE/ t , SE divided by the density and thickness) of 50,491 dB∙cm 2 ∙g −1 with an ultrathin thickness of 3.2 μm. Furthermore, the ANF/MXene (60/40) realizes a balance between mechanical properties and EMI shielding performance with the strength of 201.3 MPa and SE of 28.1 dB, which enables the ANF/MXene composite films as promising EMI shielding materials with excellent mechanical robustness.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Guozhen Liu,Song Liu,Kang Ma,Haoyu Wang,Xiaoyue Wang,Gongping Liu,Wanqin Jin
Recently, owing to their excellent structural and transport properties, two-dimensional membranes have attracted tremendous interest for their potential application in molecular separation. In this work, a new type of functionalized Ti2CTx MXene membrane was proposed by introducing different kinds of polyelectrolytes to regulate the membrane physicochemical structure for pervaporation dehydration of isopropanol dehydration. The morphology, physical, and chemical properties of powders and MXene-based membranes were studied by SEM, AFM, FTIR, XPS, and contact angle test. Meanwhile, the effect of polyelectrolyte functionalization on the MXene membrane performance for isopropanol dehydration was also studied. The results showed that the poly(diallyldimethylammonium chloride) (PDDA) functionalized MXene membrane possesses the highest separation performance owing to the optimized electrostatic effect and hydrophilicity. Besides, other influencing factors including PDDA concentration, MXene loading, and operating conditions on the MXene membrane performance were also systematically investigated. The developed PDDA functionalized MXene membrane showed excellent separation performance for dehydration of 90 wt % isopropanol/water at 50 °C with a total flux of 1237 g/m2·h and separation factor of 1932, showing great potential in application of solvent dehydration.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Wei Wan,Meizhen Tao,Hailin Cao,Yuqing Zhao,Junrong Luo,Jian Yang,Tai Qiu
Exploring flexible dielectrics with high dielectric constant and low loss is pertinent for many applications in electronic devices. In the present work, a non-ferroelectric polymer, polyvinyl alcohol (PVA), was used to fabricate homogeneous dielectric composite films with a relatively high dielectric constant and a low dielectric loss by using 2D nano sheets (Ti 3 C 2 T x MXene) as the filler. To limit dielectric loss, SiO 2 was coated onto the surface of MXene to provide interfacial barrier effect and suppress dielectric loss. MXene@SiO 2 /PVA composite films showed lower dielectric losses at low frequencies (from 20 Hz to ~ 10 kHz) compared with MXene/PVA composite films. MXene@SiO 2 /PVA composite films with 2.5 wt% MXene loading and 5 wt% (with respect to MXene content) SiO 2 coating had a dielectric constant of 27.2 (a 292.5% rise compared to neat PVA film) and a dielectric loss of only 0.057 (a 259.6% reduction compared to MXene/PVA composite film) at 100 Hz and room temperature (RT). In addition, this SiO 2 -coated composite film had stable dielectric properties (dielectric constant and loss change from 27.2 to 29.3 and 0.057 to 0.104, respectively) in the temperature range of RT to 60 °C. This work provides a promising way to fabricate PVA-based dielectric composites with excellent dielectric properties for practical applications in electronics.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 37
·375710
·
IF 3.874
Yaoguo Shen,Lin Wu,Yingwu Zhou,Hong Lin,Cheng Zhang,Hualiang Yu,Jun Wang,Lei Yu
Two-dimensional (2D) materials have attracted extensive attention owing to their unique electronic/physiochemical properties, and wide application potential in energy storage and conversion. However, 2D materials are often tendency to aggregate due to the strong van der Waals interactions, leading to gradually decrease of an efficient mass transfer pathway and accessible surface area for the electrolyte. Here, we demonstrate an efficient approach for large-scale production of a hybrid nanostructures (Ti3C2Tx/rGO) based on ultrathin MXene nanosheets anchored on layered reduced graphene (rGO) supported by porous Ni-foam via a plain chemical dipping method followed by high temperature annealing process. Ti3C2Tx/rGO electrode exhibits a porous structure, excellent ionic and electrical conductivities, and remarkable specific capacitance. Furthermore, it shows ultra-high cycle stability, for example, 88.70% of its specific capacity can be maintained through 3000 cycles. This kind of porous nanostructure and integrated design idea is significant to design other energy storage modules.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yubin Huang,Saihua Jiang,Runcan Liang,Ping Sun,Yun Hai,Lei Zhang
The use of intumescent flame-retardant (IFR) coatings is one of the most highly effective methods for polymeric materials to improve their fire safety. However, organic IFR coatings show “negative effect” in a large amount of heat and smoke release during the char-forming process. Developing nanocomposite coatings that can reduce their “negative effect” and simultaneously enhance the barrier effect of fireproof char layer is particularly desirable. Herein, a novel UV-curable IFR/MXene nanocomposite coating was developed by incorporation of surface-modified MXene nanosheets in the IFR coating system, and then constructed on the surface of rigid polyurethane (RPU) foam to fabricate coated RPU foams via spray-coating and UV-cured process. The IFR/MXene coated RPU foams show a fast self-extinguished behavior and a remarked decrease in heat and smoke production, indicating the great improvement of RPU fire safety in building. The fireproof layers combined with expanded char and MXene jammed networks generated rapidly during combustion can serve as physical shield to effectively delay the release of heat and volatile products, protecting the underlying substrate from further burning. Moreover, the mechanical properties and dispersion are enhanced due to the co-cross-linking networks between the IFR coating and MXene nanosheets. As a new member of the 2D nanomaterials, MXene nanosheets have potential to be a new choice for developing high-performance nanocomposite coating for polymers to reduce their risk of fire hazard.
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