APPLIED SURFACE SCIENCE
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2023
·
IF 6.7
Zhihui Hu,Huanmin Liu,Ningxin Kang,Kangle Lv,Qin Li
Using solvothermal methods to in situ oxidize two-dimensional titanium carbide (Ti 3 C 2 T x ) MXene into TiO 2 nanocrystals offered an effective strategy to construct highly efficient TiO 2 /Ti 3 C 2 T x heterojunctions for photocatalytic applications. Nevertheless, the effect of the chosen solvent on the Ti 3 C 2 T x oxidation and the product's performance was often neglected. Herein, isopropanol (ISO), ethanol (EtOH), ethylene glycol (EG), dimethyl sulphoxide (DMSO) and deionized water (Water) were taken as the representative solvents to prepare TiO 2 /Ti 3 C 2 T x composites by one-step solvothermal method for photocatalytic NO emission. It was the large polarity, dielectric constant and surface tension of the solvents that offered Ti 3 C 2 T x with good dispersibility and high oxidation degree during the solvothermal process. More importantly, the solvothermal treatment of Ti 3 C 2 T x in DMSO could promote the formation of TiO 2 nanoparticles with obviously higher crystallinity and more surface oxygen vacancies than those in EG, EtOH and ISO. Therefore, the photocatalytic NO oxidation efficiency of the samples within 30-min irradiation showed a descending order of TT-DMSO (46.9%), TT-Water (42.2%), TT-EG (32.3%), TT-EtOH (26.7%), and TT-ISO (19.9%). This work highlighted the significance of oxidation environment for Ti 3 C 2 T x , which could bring about some new but necessary consideration on the processing technique of MXene families for their future practical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Guandan Lu,Xuteng Xing,Jia Zhang,Xiaoyang Xu,Xiangjing Zhang,Haining Liu,Jiye Fan,Bingzhu Zhang
The cobalt ion chelated Ti 3 C 2 T x MXene (Co@Ti 3 C 2 T x MXene) composite is designed/prepared by alkalizing quasi-monolayer Ti 3 C 2 T x MXene supernatant into -OH rich sample, followed by cobalt ion chelation, to achieve the high loading amount of Co element. The optimized Co@Ti 3 C 2 T x MXene can display the high specific capacity of 48 mAh/g at the current density of 1 A/g, much higher than Ti 3 C 2 T x MXene, which is attributed to the highly dispersed quasi-monolayer structure, additional Faradaic redox reaction of Co (Ⅱ/Ш), and enhanced conductivity from Co element. In terms of practical application, the assembled Co@Ti 3 C 2 T x MXene//active carbon (AC) asymmetric supercapacitor device also exhibits the high energy density of 19 Wh/kg, and good cycle stability. The alkali modification/metal ion chelation is a simple and effective strategy to inhibit the stack and enhance electrochemical performances for Ti 3 C 2 T x MXene.
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Nano Research
·
2023
·Vol. 16
·期 7
·8902-8909
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IF 9.9
Jiang Sisi,Sun Tong,Gu Chaoqun,Ma Yingfei,Wang Zhenyu,Wang Dengchao,Wang Zonghua
MXene, a family of two-dimensional (2D) transition metal carbides and nitrides, has intriguing electrochemical energy storage and electrocatalysis applications. Introducing the electronic metal-support interaction (EMSI) effect is one effective strategy to optimize the catalytic efficiency for MXene-based composites. However, most of the studies concentrate on optimizing the performance of metals rather than supported substrates by using this strategy. In this work, we mainly investigate the influence of an EMSI effect on the performance of the supported substrate (Ti 3 C 2 T x MXene). Detailed scanning electrochemical microscopy and numerical simulations results reveal that the charge distribution on the Ti 3 C 2 T x basal plane (approximate 100 nm-radius) surrounding Au nanoparticles (20 nm-radius) was significantly enhanced as a result of —O being the majority surface functional group on Ti 3 C 2 T x that was attached to Au nanoparticle, and the related hydrogen evolution reaction (HER) activity was much better than that of the unaffected Ti 3 C 2 T x basal plane, which even can be comparable to that of Au. This finding will be helpful for designing new strategies to enhance the overall catalytic performance of various MXene-based composites.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Qingqing Li,Tianmeng Zhang,Zhixiang Dai,Fangyan Su,Xiangwei Xia,Ping Dong,Jianfeng Zhang
The demand to address issues such as drinking water safety and industrial fouling caused by high-hardness ions has still emphasized the development of advanced membrane materials. In this study, through a maneuverable amide-cross-linking strategy, a new positively-charged polyamide (PA) nanofiltration membrane was developed for the first time by incorporating amino-functionalized Ti 3 C 2 T x nanoparticles (Ti 3 C 2 T x -NH 2 , TN). In addition to the induced electropositivity, the hydrophilicity of the as-obtained PA-TN membrane was also elevated with a maintained nodular structure by tailoring the interfacial polymerization reaction process of piperazine (PIP) with trimesoyl chloride (TMC). Therefore, the newly developed PA-TN membrane exhibited both superhigh rejection of Ca 2+ and Mg 2+ over 96%, and the flux increased 2–3 times even for the salinity solutions than many similar NF membranes reported in literature. Furthermore, the enhanced long-term stability and fouling resistance of the PA-TN membrane was also validated due to its new organic-inorganic structural coupling and improved hydrophilicity. This work provides a new strategy for the preparation of organic-inorganic hybrid positively charged nanofiltration membranes for water softening treatment.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Chuanpeng Li,Yu Liu,Qiangliang Yu,Shuang Sun,Siyu Liu,Chen Zhao,Xingwei Wang,Shuangshuang Yang,Bo Yu,Meirong Cai,Feng Zhou,Weimin Liu
In this study, two-dimensional transition metal carbides and carbon nitride (MXene) and mesoporous silica nanoparticles (SiO 2 ) loaded with corrosion inhibitor 1-(3-((N-n-butyl) aminecarboxamido) propyl)-3-hexadecyl imidazolidin bromide (M16) were used to prepare a M16@MXene-SiO 2 nanocomposite with good anti-corrosion and wear resistance. The structure and composition of the nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). The synthesized M16@MXene-SiO 2 nanocomposite was then added to an epoxy coating on Q235 carbon steel. The uniform distribution of M16@MXene-SiO 2 in the coating was confirmed by SEM and atomic force microscopy (AFM). The electrochemical impedance spectroscopy (EIS) test showed that the corrosion resistance of epoxy coating was the best when the addition amount of M16@MXene-SiO 2 was 5 wt%, and its electrochemical impedance could reach 5.98 × 10 9 Ω∙cm 2 . After 144 h immersion, the coating resistance (R c ) of the epoxy coating decreased to 3.88 × 10 3 Ω∙cm 2 , and that of the epoxy coating with M16@MXene-SiO 2 increased to 1.01 × 10 4 Ω∙cm 2 . The corrosion inhibition efficiency of M16@MXene-SiO 2 was tested by potentiodynamic polarization. After immersion for 24 h, the corrosion current density (I corr ) of the epoxy coating was 2.23 × 10 −7 A∙cm −2 , which reduced to 4.38 × 10 −8 A∙cm −2 after adding M16@MXene-SiO 2 and the corrosion inhibition efficiency increased by 80.36 %. In addition, the wear resistance of the epoxy coating was tested by reciprocating friction experiment. The friction coefficient of the epoxy coating decreased from 0.44 to 0.12 after adding 5 wt% M16@MXene-SiO 2 . The results showed that the composite coating had excellent corrosion resistance, self-healing properties and wear resistance. The improvement in corrosion could be explained by the filling of coating defects with MXene-SiO 2 and the formation of corrosion inhibitor films. The improvement of friction performance was mainly attributed to the friction transfer film formed by MXene-SiO 2 and M16.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxiao Yang,Xiaolei Liu,Jianyun Zhao,Xin Jia,Zhiwei Li,Chunhui Xiao,Jiuhong Wang,Yinhuan Li,Jin Liang,Shujiang Ding,Wei Yu
Ti 3 C 2 T x can dissipate energy well due to its high conductivity, but at the expense of severe electromagnetic (EM) wave reflection, which is exacerbated by self-stacking. Despite various attempts to tackle this problem, the excessive isolation of Ti 3 C 2 T x and massive high-density inorganic components render these designs unfavorable for lightweight and broadband absorption. Meanwhile, improvements in absorption performance are related to active surface and polarization interface expansion, as well as conductive path reconstruction, but the main contributing factor remains unknown. In this work, the dual-shell structured Ti 3 C 2 T x @CNTs/Ni-HS (hollow sphere) composites are fabricated. This structure creates a confined dissipation cage, where the CNTs/Ni shell confines the electron transfer among spheres and prevents self-restacking and the tightly contacted Ti 3 C 2 T x shell forms an uninterrupted conductive path for effective dissipation. Therefore, Ti 3 C 2 T x @CNTs/Ni-HS-1 exhibits a broad effective absorption band of 6.1 GHz and a minimum reflection loss of −64.6 dB at a mass ratio of only 15 wt%. Importantly, when hollow structure cracks, although large active surface and polarizable interface remain, the absorption capacity of fragmented Ti 3 C 2 T x @CNTs/Ni-HS-1 deteriorates, indicating rational conductive path in confined dissipation cage is the main factor in achieving excellent performance. This work provides new insight for the rational design of high-performance absorbers.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Xinxin Li,Boxin Zhao,Wenjing Qin,Min Yang,Lei Feng,Changshun Gu,Zhenhao Tian,Hengchao Liu,Xiujie Guo,Yan Zhang,Shougen Yin
Developing multifunctional electronic fabrics with sensing capabilities, electromagnetic interference (EMI) shielding, and Joule heating performance holds great significance for health monitoring and medical protection. However, most fabrics struggle to combine multiple functions and optimize them simultaneously. For example, achieving both high sensitivity and a wide detection range in sensing devices remains a challenge. In this paper, we present a multidimensional composite structure comprising MXene Ti3C2Tx nano lamellar, self-assembled lotus leaf-like MXene/EGaIn and carbon nanotubes (CNTs) assembled on the surface of thermoplastic polyurethane to create a multifunctional MXene EGaIn/MXene CNT fabric (MEMC fabric). The multidimensional materials form a stable conductive network under tension. As a strain sensor, the MEMC fabric exhibits a large sensing range (0–360%) and ultra-high sensitivity (GF ∼ 114,700), making it suitable for artificial eardrum research. Additionally, MEMC demonstrates excellent EMI shielding effect (∼73 dB) and maintains good EMI shielding performance under tensile conditions. The fabric also showcases outstanding Joule heating performance (low voltage drive ∼2 V, fast heating time ∼13 s, and high heating stability ∼4000 s). This paper also demonstrates the multifunctional combination of MEMC fabrics, achieving simultaneous sensing, EMI shielding, and Joule heating functions under stretching. This work offers a forward-looking approach for constructing multifunctional composite fabrics, and the resulting MEMC composite materials hold potential applications in portable electronic devices and defense industries.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xuemei Yao,Ziting Qi,Peizhi Yang,Jiabao Li,Wen Yang
Simultaneously manipulating the interfacial energetics to boost charge extraction and passivate defective nanostructure to suppress unwanted non-radiative recombination is of great importance to increase the power conversion efficiency and long-term stability of carbon-based perovskite solar cells (C-PSCs), which requires rational design of interfacial regulator. Herein, a novel two-dimensional (2D) Ti 3 C 2 T x MXene patched graphene oxide (GO) heterojunction is fabricated as perovskite film plaster to improve the overall photovoltaic performance of C-PSCs. Arising from the nucleophilic substitution and dehydration reaction between MXene (Ti-O - ) and GO (-C=OH + ), the negative-charge-centered GO induced by the oxygen-containing functional groups is healed. As a result, this heterojunction not only aligns the perovskite/carbon energy-level and provides a channel for carrier transport, but also effectively solidifies the soft perovskite lattice, universally promoting the efficiencies up to 11.07% for inorganic CsPbIBr 2 C-PSC and 15.04% for CsPbI 2 Br C-PSC with significantly improved stability.
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Environmental Science-Nano
·
2022
·Vol. 9
·期 12
·4468-4483
·
IF 9.473
Peng Zhang,Yiran Wang,Xiaomin Luo,Jian Wang,Wenqi Wang,Xubin Duan,Kai Qi,Meng Li
The heterogeneous electro-Fenton (HEF) membrane has shown great potential for the treatment of refractory organic pollutants, but there are growing demands to improve its degradation efficiency and suitability for addressing practical organic pollutant issues. Here, a novel Co-CNT/Ti3C2TX nanocomposite membrane was successfully prepared by vacuum filtration, followed by heat treatment. Different from the traditional batch reactor, a flow-through reactor with Co-CNT/Ti3C2TX membrane was designed as an electrode to make the full use of the combined synergistic effect of adsorption and electro-Fenton (EF) process for the degradation of organic pollutants. The results found that the Co-CNT/Ti3C2TX flow-through HEF system exhibited satisfactory degradation (99.0–83.2%) on tetracycline (TC) in a wide range of pH 2.0–7.0. In addition, the obtained Co-CNT/Ti3C2TX membrane possesses self-cleaning performance in long-term continuous conditions. Co-CNT/Ti3C2TX membrane can also be used to treat practical TC wastewater with complex components, tannery printing and dyeing wastewater, and wastewater with different water matrices, and their removal efficiency can reach more than 87.0%. Specially, the coupling effect could be beneficial to accelerate the degradation of pollutants in the EF process. The method provided in this work could be further expanded, making industrial usage of the HEF membrane a reality.
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JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Haoqiang Wang,Pengju Wang,Wei Gan,Lijie Ci,Deping Li,Qunhui Yuan
Aiming to improve the sluggish ion insertion/extraction at the battery-type anode in lithium-ion/sodium-ion hybrid capacitor (LIC/SIC), herein, a VS 4 @L-Ti 3 C 2 T x composing of VS 4 nanoarrays and MXene with enlarged interlayer spacing is developed through a facile hydrothermal approach. Benefiting from the merits of building blocks, the VS 4 @L-Ti 3 C 2 T x based lithium-ion half-cell exhibits superior specific capacity (1328 mAh g −1 after 170 cycles at 0.1 A g −1 ), rate performance (808 mAh g −1 after 10 cycles at 20 A g −1 ) and cycling stability (721 mAh g −1 after 500 cycles at 1.0 A g −1 ), surpassing most of the reported VS 4 based counterparts. The sodium-ion half-cell with VS 4 @L-Ti 3 C 2 T x anode also shows good performances. Moreover, LIC and SIC based on VS 4 @L-Ti 3 C 2 T x anodes deliver high energy densities of 122.5 Wh kg −1 and 117.0 Wh kg −1 at a low power density 100.3 W kg −1 , respectively. Additionally, they exhibit excellent cycling lifespans with capacity retention of 60% after 20000 cycles for LIC at a high current rate 1.0 A g −1 , outperforming most of the reported analogues. This study may shed light on the development of other layered anode materials for energy storage devices.
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Advanced Materials Technologies
·
2022
·Vol. 7
·期 7
·2101639
·
IF 8.856
Chuqiao Hu,Hao Chen,La Li,Hui Huang,Guozhen Shen
The enriched surface functional group such as OH termination and unique 2D structure of Ti 3 C 2 T x MXene provide the feasibility to form hydrogen bonds with organic photosensitive materials as van der Waals heterostructures, thus can realize the improved photoresponsivity of near infrared (NIR) photodetectors (PDs). In this work, an organic–inorganic van der Waals heterostructure-based NIR PD array is designed using Ti 3 C 2 T x MXene as conductive electrodes and RAN film as active materials (Ti 3 C 2 T x -RAN PDs). The on-off ratio of the fabricated devices shows 6.25 times higher than that of PDs using thermal evaporated Au electrode (Au-RAN PDs) under 1064 nm laser excitations. The fabricated Ti 3 C 2 T x -RAN NIR PDs also possess outstanding mechanical stability with no obvious photoresponse degradation under different bending states and high transparency with a transmittance above 70% in the visible region. Owing to the high performance of the Ti 3 C 2 T x -RAN PDs, a 1024-pixel (32 × 32) image sensor array is fabricated to achieve delicate, vivid, and higher resolution imaging of a “deer,” opening up a new avenue for the biomimetic vision and flexible wearable accurate image sensing.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yixuan Xia,Jiating Li,Gangbing Zhu,Yinhui Yi
Anodic stripping voltammetry (ASV) is presently the most widely used method for mercury ion (Hg 2+ ) detection, but it generally needs an electrodeposition step. As a new star nanomaterial , MXenes shows greatly important applications in electrochemical sensing. In this work, by preparing Ti 3 C 2 T x MXenes nanoribbons/carbon nanotube (Ti 3 C 2 T x R/CNT) nanohybrids to modify glassy carbon electrode (GCE) as sensing platform, an innovative strategy without electrodeposition was proposed for the sensitive detection of Hg 2+ . The results show that Ti 3 C 2 T x R exhibits spontaneous adsorption and reduction capability towards Hg 2+ , which can make Hg 2+ self-reduced and preconcentrated on the electrode surface . Coupled with the excellent electronic properties of CNT, an electrodeposition-free and sensitive ASV sensor was constructed, and Ti 3 C 2 T x R/CNT/GCE can exhibit superior sensing performances for Hg 2+ analysis with a low detection of limit (5.2 nM) and wide linearity range (0.01–7.0 μM). This work offered a new direction for MXenes nanomaterials and Hg 2+ detection.
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