APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingzhe Jia,Huailin Yang,Lei Wang,Zhiqi Zhao,Xinming Wu
Compared with most transition metal based electrode materials, 2D M n+1 X n T x has high conductivity and good solvent compatibility. However, its low energy density hinders its application as supercapacitior electrode for electrochemical energy storage applications. Herein, the interface-pillared of Fe-MOF (MIL-100(Fe)) onto Ti 3 C 2 T x MXene layer, which provide rich electrochemical active sites, is achieved, and the MOF nanospheres with MXene nanosheets are subsequently converser into three dimensional multilayer porous nanostructures through the chemical bond couping. Therefore, the MOF nanospheres are anchored between the nansheets of MXene, enabling the fast ion transportation in the three dimensional nanostructures. Menanwhile, the MOF nanospheres prevent the aggregation of MXene nanosheets, and the laminar structure is maintained for more redox reaction sites within the hybrid electrodes through fast charge–discharge cycles. As a result, the MIL-100(Fe)/Ti 3 C 2 T x MXene electrode displays superior energy density (85.53 Wh kg −1 ), which is much higher than the other MXene-based electrodes as far as we know. This design strategy of 2D hybrid electrodes opens up a new way for the commercial application of high perfermance supercapacitor.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Bingbing Fan,Muhammad Tamoor Ansar,Qianqian Chen,Fengchun Wei,Heng Du,Bo Ouyang,Erjun Kan,Yongqiang Chen,Biao Zhao,Rui Zhang
Simple and effective synthesis methods for 2D/2D heterostructure and the synergistic effect of 2D/2D composites on microwave absorbing (MWA) performance remain to be further explored and investigated. Herein, 2D/2D MoS 2 /Ti 3 C 2 T x heterostructure was successfully synthesized in 30 min by a cost-effective and time-saving microwave-assisted hydrothermal method . The 2 H-MoS 2 nanosheets with a thickness of 5–10 nm were homogeneously anchored on the surface of Ti 3 C 2 T x layers, showing a tunable distribution density. Besides, the metallic properties of MoS 2 /Ti 3 C 2 T x and the strong interaction between MoS 2 and Ti 3 C 2 T x , were revealed by DFT calculations, which was employed to further understand the MWA mechanism in terms of molecular dynamics. The MoS 2 /Ti 3 C 2 T x composites with an optimum mass ratio of MoS 2 to Ti 3 C 2 T x (6:1) displayed the best MWA performance. The minimum reflection loss ( RL ) value of −41.5 dB was attained with a layer thickness of only 2.0 mm at 12.2 GHz and a 3.6 GHz maximum efficacious absorption bandwidth. The MWA mechanism of MoS 2 /Ti 3 C 2 T x composites was comprehended from multiple reflections and scattering effects, synergetic effects of conductive losses and attenuation capacity, and polarization relaxations. This work provides a facile method for the synthesis of 2D/2D heterostructure, and also provides a candidate material as potential microwave absorber.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Zhichao Li,Xinyu Liu,Xuyun Wang,Hui Wang,Jianwei Ren,Rongfang Wang
Despite the existing advances of Ti 3 C 2 T x MXene as supercapacitor electrode material, its capacitance can be further enhanced through the composite strategy. In this work, the nitrogen-doped superhydrophilic carbon cloth (ENCC) was firstly prepared by N-doping of carbon cloth (CC), and then Ti 3 C 2 T x MXene nanosheets were electrophoretically deposited to yield the binder-free Ti 3 C 2 T x(EPD) /ENCC as supercapacitor electrode material. As a result, the composite electrode exhibited an area-specific capacitance of 2080.1 mF·cm −2 at 1 mA·cm −2 current density. The analysis implied that the varying Ti valence states provided certain psedocapacitance to the capacitance of the as-prepared electrode, though the main contribution was still dominantly from the electric double layer capacitance (EDLC). Further, the assembled symmetric supercapacitor yielded a wide voltage window of 1.8 V, and a good cyclic stability with 91% capacitance retention after 10,000 charge/discharge cycles at 20 mA·cm −2 . Overall, the employed composite strategy enabled the good dispersion of the MXene flakes on the surface of the flexible substrate . Meanwhile, the large number of functional groups (-OH, -F, etc.) on the surface of Ti 3 C 2 T x MXene interacted with the carbon layer through hydrogen bonding effects, which endows it as an ideal electrode for electrochemical capacitors .
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International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 1
·251-260
·
IF 2.328
Fada Wei,Qinghua Liu,Heqiang Liu,Guohong Wang,Minghang Li,Mingxing Li,Xingmin Liu
The proliferation of electronic devices and wireless communication is leading to serious electromagnetic (EM) interference. In this work, Ti 3 C 2 /cement composites were developed as high efficiency EM functional materials by introducing exfoliated Ti 3 C 2 T x MXene with cement for green buildings with EM shielding function. In the composites, few-layered Ti 3 C 2 MXene were dispersed homogeneously throughout the cement matrix. The EM properties of the composites were studied as a function of the MXene content. With increasing MXene content, real and imaginary part of permittivity was significantly improved owing to the polarization and electrical conduction caused by the MXene phase. Composites with 15 wt.% MXene showed good EM absorbing properties with a maximum effective absorbing bandwidth of 2.67 GHz. Strong EM shielding can be achieved when MXene content increased to 25 wt.%. The EM shielding effectiveness of such composites was higher than 22.0 dB, and the dominating shielding mechanism was EM absorption. This work finds new materials for the development of advanced green buildings with EM shielding function.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 11
·1-9
·
IF 5.833
Xia Yixuan,Ma Yuzhi,Wu Yuntao,Yi Yinhui,Lin Huiyu,Zhu Gangbing
A proof-of-principle concept for free-electrodeposited anodic stripping voltammetry (ASV) sensing of Cu 2+ is proposed by using Ti 3 C 2 T x MXene/carbon black (Ti 3 C 2 T x @CB) nanohybrids as electrode materials. Owing to the high adsorption and reduction capability of Ti 3 C 2 T x towards Cu 2+ , Ti 3 C 2 T x MXene enables Cu 2+ to be immobilized and self-reduced directly to form Cu 0 on the Ti 3 C 2 T x @CB electrode surface. As a result an oxidation peak current appears from the re-oxidation of Cu 0 via differential pulse voltammetry. Carbon black (CB) was introduced to prevent Ti 3 C 2 T x Mxene aggregation and improve the related electron transfer as well as enhance their surface area. After optimizing various conditions, a considerable low limit of detection (4.6 nM) and a wide linear range (0.01–15.0 μM) for Cu 2+ were achieved at the working potential from − 0.3 V to 0.0 V (vs SCE). Relative standard deviation (RSD) of eight individual Ti 3 C 2 T x @CB electrodes is 3.72%, and the recoveries from tap water sample and lake water sample were in the ranges of 97.0–108% and 104–107%, respectively. Graphical abstract
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Niandu Wu,Wenhua Zhao,Boye Zhou,Yizhang Wu,Wentao Hou,Wei Xu,Jun Du,Wei Zhong
Ti 3 C 2 T x (MXene) has intriguing application potential for supercapacitors. However, it usually suffers from self-accumulate and restack, resulting in the decrease of electrochemical active sites and low capacitance. Here, we demonstrated a 3D nitrogen-doped Ti 3 C 2 T x /rGO (NTG) foam which was synthesized through the multistep of gelation assisted with urea, freeze-drying, and thermal treatment processes. The decomposition of urea can not only change the morphology, bringing out more open marco- and microporous structures, but also improve the conductivity due to the nitrogen doping in the matrix. The 3D porous architecture can expose more electrochemical active sites, and thus accelerate the transport/diffusion of electrolyte ions. Consequently, the NTG foam possesses a high specific capacitance of 463 F g −1 , good rate performance, and outstanding cycling stability (90.8% retention after 10 000 cycles) in H 2 SO 4 electrolyte, showing enhanced performance of supercapacitors in comparison with pure Ti 3 C 2 T x and Ti 3 C 2 T x /rGO electrode.
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Materials Today Physics
·
2021
·
IF 9.298
Fengqi Qi,Lei Wang,Yali Zhang,Zhonglei Ma,Hua Qiu,Junwei Gu
Lightweight and robust electromagnetic interference (EMI) shielding materials are highly desirable in high-end precision electronic components and 5G communication system . Herein, the starch based porous carbon foam (PCF) is prepared by yeast fermentation, steam foaming and carbonization approach with flour as raw material. The Ti 3 C 2 T x MXene/PCF (MPCF) composites are then fabricated via vacuum assisted impregnation of Ti 3 C 2 T x MXene followed by freeze drying. The obtained PCF presents excellent compression strength and superior electrical properties. The compression strength and electrical conductivity ( σ ) of the PCF carbonized at 1400 °C are 4.9 MPa and 21.8 S/cm, respectively. The MPCF composites with 8.5 wt% Ti 3 C 2 T x MXene exhibits superior EMI shielding effectiveness (EMI SE) and specific shielding effectiveness (SSE, EMI SE/ ρ ) of 75 dB and 216.9 dB cm 3 /g, respectively. Meanwhile, the MPCF composites possess excellent flame retardancy and outstanding heat insulation performances, and can be applied in the extreme environments. The resultant lightweight, robust and multifunctional MPCF composites with simple fabrication processes show broad application prospects for EMI shielding systems in aerospace, military engineering, electrical and electronics fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Chunli Hou,Huangzhong Yu,Chengwen Huang
The optimized electron transport layer (ETL) plays a crucial role in the practical application of polymer solar cells (PSCs). Herein, bio-inspired polydopamine (PDA) modified Ti 3 C 2 T x (PDA-Ti 3 C 2 T x ) as a multifunctional additive is dispersed into ZnO to fabricate ZnO:PDA-Ti 3 C 2 T x composite ETL. PDA-Ti 3 C 2 T x passivates the trap states of ZnO via forming strong and stable chelate interactions through Zn 2+ ions and PDA molecules. PDA-Ti 3 C 2 T x also lowers the vacuum level of transport layer by forming interface dipoles between catechol of PDA and Zn 2+ ions of zinc oxide. Moreover, PDA-Ti 3 C 2 T x constructs additional electron transport pathways by connecting the discontinuities among ZnO nanocrystals . As such, ZnO:PDA-Ti 3 C 2 T x composite ETL, with higher conductivity and proper work function, can effectively collect electrons in the PSCs. Compared with ZnO control devices, the performance of PSCs with ZnO:PDA-Ti 3 C 2 T x ETL is obviously enhanced with power conversion efficiencies (PCEs) from 10.34% to 12.07% based on PBDB-T:ITIC, 14.84–16.69% based on PM6:Y6, and 8.14–9.41% for PTB7:PC 71 BM, respectively. The ambient stability of the PSCs with ZnO:PDA-Ti 3 C 2 T x ETLs is significantly improved due to the increased hydrophobicity of ETL and the enhanced crystallinity of active layer. The novel ETLs provide a facile, eco-friendly, low-cost approach to realize the highly performance and stable PSCs.
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ANALYST
·
2021
·Vol. 146
·期 24
·7593-7600
·
IF 4.616
Ling Lei,Caoling Li,Wensheng Huang,Kangbing Wu
Developing a sensitive and rapid detection method for 4-chlorophenol (4-CP) and 4-nitrophenol (4-NP) is very important due to their high toxicity. In this work, bulk Ti3AlC2 powder was etched to Ti3C2Tx for the first time through a hydrothermal reaction in NaF/HCl solution. After ultrasonication in N-methylpyrrolidone (NMP), Ti3C2Tx powder was successfully exfoliated into multilayered Ti3C2Tx nanosheets (i.e. Ti3C2Tx MXene). The prepared Ti3C2Tx MXene not only has a large electrochemical surface area for the oxidation of 4-CP and 4-NP, but also lowers their electron transfer resistance. As a result, the oxidation signals of 4-CP and 4-NP are significantly improved on the surface of the Ti3C2Tx MXene. Based on the remarkable signal amplification of the Ti3C2Tx MXene, a sensitive and rapid method was developed for the simultaneous detection of 4-CP and 4-NP. The linear range is from 0.1 to 20.0 μM for 4-CP, and from 0.5 to 25.0 μM for 4-NP, with detection limits of 0.062 μM (4-CP) and 0.11 μM (4-NP). This method was used in wastewater samples, and the accuracy was confirmed to be good by high-performance liquid chromatography.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaoqing Bin,Yapeng Tian,Yangyang Luo,Minhao Sheng,Yijia Luo,Maomao Ju,Wenxiu Que
In order to obtain high-performance flexible electrodes for supercapacitors, the nitrogen-doped delaminated-Ti 3 C 2 T x (N-d-Ti 3 C 2 T x ) decorated with MoO x nanoparticles (N-d-Ti 3 C 2 T x /MoO x ) films are prepared by a one-step solvothermal method. The N-d-Ti 3 C 2 T x nanosheets with high conductivity can facilitate electron transfer during the charge and discharge process, and the MoO x nanoparticles can contribute to high pseudocapacitance. Hence, their combination is expected to not only inhibit N-d-Ti 3 C 2 T x nanosheets from re-stacking, but also enhance the specific capacity of the whole electrode. Here, benefiting from the synergistic effect of the two components, the obtained optimal flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode delivers an ultrahigh capacity of 341.0 C g −1 (920.6 C cm −3 , 487.1 F g −1 , 1315.2 F cm −3 ) at the scan rate of 2 mV s −1 , and shows superior capacity retention of 99.2% after 11000 cycles at the current density of 5 A g −1 . Moreover, the flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode is also beneficial to promote the development of flexible supercapacitors.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Dong Wen,Xiang Wang,Lu Liu,Cong Hu,Cheng Sun,Yiran Wu,Yinlong Zhao,Jianxin Zhang,Xudong Liu,Guobing Ying
MXene is a generic name for a large family of two-dimensional transition metal carbides or nitrides, which show great promise in the field of transparent supercapacitors. However, the manufacturing of supercapacitor electrodes with a high charge storage capacity and desirable transmittance is a challenging task. Herein, a low-cost, large-scale, and rapid preparation of flexible and transparent MXene films via inkjet printing is reported. The MXene films realized the sheet resistance (Rs) of 1.66 ± 0.16 MΩ sq–1 to 1.47 ± 0.1 kΩ sq–1 at the transmissivity of 87–24% (λ = 550 nm), respectively, corresponding to the figure of merit (the ratio of electronic to optical conductivity, σDC/σOP) of ∼0.0012 to 0.13. Furthermore, the potential of inkjet-printed transparent MXene films in transparent supercapacitors was assessed by electrochemical characterization. The MXene film, with a transmittance of 24%, exhibited a superior areal capacitance of 887.5 μF cm–2 and retained 85% of the initial capacitance after 10,000 charge/discharge cycles at the scan rate of 10 mV s–1. Interestingly, the areal capacitance (192 μF cm–2) of an assembled symmetric MXene transparent supercapacitor, with a high transmittance of 73%, still surpasses the performance of previously reported graphene and single-walled carbon nanotube (SWCNT)-based transparent electrodes. The convenient manufacturing and superior electrochemical performance of inkjet-printed flexible and transparent MXene films widen the application horizon of this strategy for flexible energy storage devices.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 35
·19984-19993
·
IF 12.732
Hao Wang,Peng Hu,Jie Zhou,Maarten B. J. Roeffaers,Bo Weng,Yongqing Wang,Hongbing Ji
Ultrathin 2D/2D Ti3C2Tx/semiconductor (CdS and Bi2MoO6) dual-functional photocatalysts have been constructed for the oxidative coupling of benzylamines to imines combined with H2 generation under visible light irradiation (λ ≥420 nm). The optimal 2D/2D Ti3C2Tx/CdS sample exhibits high photocatalytic performance toward H2 evolution (219.7 μmol g−1 h−1) and imine production (155.8 μmol g−1 h−1), which is 5 times and 6 times higher than that of pure CdS, respectively. In situ irradiated XPS and photoelectrochemical characterizations reveal that the enhanced photoactivity over Ti3C2Tx/semiconductor heterostructures can be attributed to the facilitated charge separation from the semiconductors to the Ti3C2Tx cocatalyst. A possible reaction mechanism is proposed based on in situ FTIR spectroscopy of benzylamine adsorption and imine product desorption and reaction intermediate detection using in situ ESR. This work provides a systematic strategy to construct ultrathin 2D/2D Ti3C2Tx/semiconductor heterojunctions for photocatalytic synthesis of high value-added products combined with H2 generation.
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