MOLECULES
·
2022
·Vol. 27
·期 15
·4890
·
IF 4.927
Xin Tao,Linlin Zhang,Xuedong He,Lingzi Fang,Hongyan Wang,Li Zhang,Lianghao Yu,Guang Zhu
Flexible supercapacitors (FSCs) are limited in flexible electronics applications due to their low energy density. Therefore, developing electrode materials with high energy density, high electrochemical activity, and remarkable flexibility is challenging. Herein, we designed nitrogen-doped porous MXene (N-MXene), using melamine-formaldehyde (MF) microspheres as a template and nitrogen source. We combined it with an electrospinning process to produce a highly flexible nitrogen-doped porous MXene nanofiber (N-MXene-F) as a self-supporting electrode material and assembled it into a symmetrical supercapacitor (SSC). On the one hand, the interconnected mesh structure allows the electrolyte to penetrate the porous network to fully infiltrate the material surface, shortening the ion transport channels; on the other hand, the uniform nitrogen doping enhances the pseudocapacitive performance. As a result, the as-assembled SSC exhibited excellent electrochemical performance and excellent long-term durability, achieving an energy density of 12.78 Wh kg−1at a power density of 1080 W kg−1, with long-term cycling stability up to 5000 cycles. This work demonstrates the impact of structural design and atomic doping on the electrochemical performance of MXene and opens up an exciting possibility for the fabrication of highly FSCs.Keywords:flexible supercapacitors;nitrogen-doped 3D MXene;electrospinning
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Chunzheng Wu,Jingyuan Lin,Zhuojiong Xie,Xuan Kai,Xiao Yu,Zhenyu Yan,Jinwei Fang,Shanliang Chen,Jianzhong Guo,Wei Wang,Fengping Peng
Temperature fluctuations caused by sunlight represent a form of low-quality thermal energy that is generally insufficient for driving chemical reactions. Here, we designed a ZnO–MXene (Ti3C2) heterostructure catalyst, which can harvest solar near-infrared (NIR) energy to drive the sluggish ammonia production reaction using water and N2 as the feedstock. Our research confirmed that ammonia was produced through a pyroelectric process, rather than a photocatalytic process. The ZnO–MXene heterostructure with ∼20 wt% of Ti3C2 exhibited a 6.5-fold improvement in activity compared to bare ZnO. The Ti3C2 not only harvests NIR energy to heat up the pyroelectric ZnO, but also traps the pyro electrons from ZnO and co-catalyzes the reduction of N2 to ammonia. This work offers a novel strategy for ammonia production utilizing the abundant solar NIR energy under ambient conditions.
研究领域:
材料科学
·
催化化学
·
能源利用
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yu Fang,Yang Cao,Bihui Tan,Qianlin Chen
Solar energy can be used as “green” energy by photocatalysis for the nitrogen fixation under the atmospheric conditions compared with the traditional energy-intensive industrial production of ammonia. However, the complex kinetics and high reaction barriers greatly hinder the development of the photocatalytic N2 reduction reaction. Herein, a BiOBr/MXene-Ti3C2 composite catalyst is prepared by the simple electrostatic adsorption and self-assembly method. The as-prepared 10 wt % BiOBr/Ti3C2 exhibits the best performance for N2 fixation to NH3 by photocatalysis. The evolution rate of NH3 is up to 234.6 μmol·g–1·h–1, which is approximately 48.8 times and 52.4 times higher than those of pure BiOBr and Ti3C2, respectively. It is found that the designed double vacancies of oxygen and titanium for BiOBr/Ti3C2 composites, with the availability of localized electrons, have the ability to adsorb and activate N2, which can be efficiently reduced to NH3 by the interfacial electrons transferred from the excited BiOBr/Ti3C2 composite. In addition, the results of in situ Fourier transform infrared show the generation of NxHy species by the continuous protonation processes. Moreover, titanium vacancy (VTi) induces a strong absorption energy for nitrogen atoms on the surface of BiOBr/Ti3C2 according to the density functional theory calculations. In particular, the P-electron feedback caused by VTi could effectively promote the weakening of the N≡N triple bond and elongate the N2 bond length by ∼31.6%. This work might provide new insights into the synergistic effect of double defects and inspiration for the rational design of catalysts by defect engineering in the field of catalytic synthesis of ammonia.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Soft Matter
·
2019
·Vol. 16
·期 1
·162-169
·
IF 3.399
Peng Zhang,Xiu-Jie Yang,Peng Li,Yingyuan Zhao,Qingshan Jason Niu
A highly stretchable nanocomposite (NC) hydrogel was fabricated via in situ free radical polymerization of acrylamide. In particular, an exfoliated two-dimensional MXene (Ti3C2) nanosheet was utilized as a crosslinker instead of traditional organic crosslinkers. The exfoliated Ti3C2 nanosheets were confirmed by atomic force microscopy (AFM) and dynamic light scattering (DLS) measurements. Compared with traditional organic crosslinked N,N-methylene bisacrylamide (BIS)/polyacrylamide (PAM) hydrogels (fracture strength of 32.0 kPa and elongation of 109.6%), the synthesized Ti3C2/PAM NC hydrogels exhibited greatly improved mechanical properties with fracture strengths of 66.5 to 102.7 kPa, compressive strengths of 400.6 to 819.4 kPa and elongations at break of 2158.6% to 3047.5% as the Ti3C2 content increases from 0.0145% to 0.0436%. The enhanced mechanical performances can be attributed to the honeycomb-like fine structure with uniform pores as well as more flexible polymer chains in NC hydrogel networks. When loaded with drugs, Ti3C2/PAM NC hydrogels exhibited good sustained-release performance, higher drug loading amounts (97.5–127.7 mg g−1) and higher percentage releases (62.1–81.4%), greatly superior to those of the BIS/PAM hydrogel (46.4 mg g−1, 45.0%). Our work reveals the application of MXene materials in the fabrication of NC hydrogels with enhanced mechanical and drug release behaviors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Lu Liu,Guobing Ying,Cong Hu,Kaicheng Zhang,Fengchen Ma,Lin Su,Chen Zhang,Cheng Wang
MXene is a two-dimensional transition metal carbide or carbonitride with graphene-like 2D morphology and high surface activity, which are useful features in energy storage, catalysis, and adsorption. However, only a handful of structural applications have so far been reported. In this study, functionalization of a carbon fiber (CF) was achieved by MXene (Ti3C2) to improve the CF surface wettability. The results showed that functionalization of MXene not only changed the CF surface topography and increased the mechanical engagement effect during debonding but also enhanced the surface activity of carbon fibers. The interfacial shear strength increased by 186% when compared with nonfunctionalized specimens. A possible interfacial enhancement mechanism was proposed to provide a future roadmap for surface modification of carbon fibers.
研究领域:
材料科学
·
复合材料工程
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chao Peng,Ping Wei,Xin Chen,Yongli Zhang,Feng Zhu,Yonghai Cao,Hongjuan Wang,Hao Yu,Feng Peng
2D MXenes have attracted extensive attentions owing to their anisotropy, high conductivity and other extraordinary properties. The popular preparation method of MXenes usually involves HF in high concentrations, which has seriously restricted their pervasive applications. In this work, a new hydrothermal route with low-toxicity etching agents (NaBF 4 , HCl) was used to synthesize Ti 3 C 2 MXene ( h- Ti 3 C 2 ). Compared with the Ti 3 C 2 prepared by the traditional HF etching method ( t- Ti 3 C 2 ), the h- Ti 3 C 2 has the higher c lattice parameter , larger interlayer distance and larger BET specific surface area, because of the slow release mechanism during the hydrothermal process. The hydrothermal etching method not only avoided the use of high-concentration HF, but also was more efficient to prepare Ti 3 C 2 flakes. Moreover, the hydrothermal etching route can be extended to other MXene materials, e.g. Nb 2 C. We demonstrated that the h -MXenes have better adsorption performance of methylene blue and methyl orange dyes. The hydrothermal etching route proposed in this study enabled the environmental benign and high efficiency exfoliation of MXenes, displaying the promise to facilely prepare 2D MXenes and paving a way to their widespread applications.
研究领域:
材料科学
·
纳米材料
·
环境功能材料
·
表面化学
·
胶体与界面科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Zongbin Liu,Xiaojiao Yu,Kai Wang,Yuchen Wei,Jian Zhang,Jinfen Niu
Photocatalytic technology has received a great deal of attention due to its high efficiency and environmentally friendly properties in the treatment of wastewater. MXene, a rapidly expanding family of two-dimensional materials, is widely used in various fields due to its unique layered structure, large specific surface area, excellent hydrophilicity and strong electrochemical performance. In this paper, a simple hydrothermal method has been used to synthesize Cu 2 O-MXene(Ti 3 C 2 ) photocatalysts. The successful introduction of Ti 3 C 2 MXene reduced the surface transfer resistance to promote electron transfer, effectively inhibited electron-hole complexation and increased the specific surface area of the catalyst. The prepared samples have excellent photocatalytic properties due to the above-mentioned advantages. Efficient degradation of antibiotics was achieved with the maximum degradation rate of sulfamethazine (SM2) by M 2 -Cu 2 O reaching 85.7 % in 160 min. It was experimentally confirmed that • O 2 ‐ and h + played the major roles in the degradation process, and possible degradation pathways and photocatalytic mechanisms were proposed in conjunction with HPLC-MS/MS. Finally, the intermediate products were tested for their biotoxicity. This work provides a strategy for the construction of highly catalytically active Cu 2 O-based catalysts.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Taotao Qiang,Boqiang Qiu,Lu Chen,Longfang Ren
In this work, a novel adsorbent for the removal of hexavalent chromium (Cr(VI)) in aqueous solution was successfully prepared by altering the 2D Ti 3 C 2 /chitosan composite with disodium ethylenediaminetetraacetate (EDTA·2Na) agent. The successful surface loading of chitosan on Ti 3 C 2 was demonstrated by various characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR). The adsorption of Cr(VI) by Ti 3 C 2 -based composite under various circumstances was evaluated using batch adsorption experiments. The adsorption performance of the optimal sample for Cr(VI) was investigated in detail through different influencing factors, and the adsorption process was analyzed by adsorption kinetics and isotherm model. In addition, XPS analysis of adsorbents before and after adsorption showed that some Cr(VI) was reduced to Cr(III) during the whole process, which was conducive to reducing the biological toxicity of Cr(VI). The mechanism analysis showed that the adsorption was mainly electrostatic physical adsorption, supplemented by chemical reduction adsorption. Finally, through the regeneration cycle experiment, it was found that the adsorption rate of Cr(VI) remained above 80% after six repeated adsorptions, indicating that the composite material had good stability and might have certain practical application value in the treatment of Cr(VI)-containing wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2018
·
IF 4.92
Nadia Taloub,Abdelkhalek Henniche,Li Liu,Jun Li,Nahla Rahoui,Mohammad Hegazy,Yudong Huang
The pursuit of improving the performance of rigid-rod polymeric fibers using a new inorganic nano-materials and efficient methods is very attractive topic. The combination of the unusual properties of both materials could definitely produce an outstanding final product. Herein, we proposed a simple grafting method of a graphene-like titanium carbides Ti 3 C 2 (OH) 2 nanosheets (MXene) onto PIPD surface via covalent bond by using (3-Aminopropyl) triethoxysilane (APTES) as a bridging agent. The surface morphology and element compositions of PIPD fiber before and after grafting were characterized, and the effect of such treatment on the mechanical properties was also evaluated. The IFSS of the PIPD-Ti 3 C 2 (OH) 2 was highly increased by 61.54% because of the significant improvement the fiber/epoxy interaction and surface wettability . Though the tensile strength (TS) was slightly decreased by only 5%. Furthermore, the experiment results showed a great enhancement of UV and hydrothermal aging resistance of the grafted fibers comparing with untreated ones by 33% and 25% respectively.
研究领域:
材料科学
·
聚合物复合材料
·
纳米材料
·
表面改性
·
纤维增强
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Hongfei Mei,Jinsong Peng,Haiyan Song,Chunxia Chen
Photocatalytic H2O2 production in seawater offers a novel and sustainable route for the substitution of freshwater consumption. However, this strategy is limited by the complexity and cost resulting from electron–proton donors and pure O2 dependency. Simultaneously, adsorption, a frequently used method to treat radionuclide wastewater, latently causes issues of adsorbent-caused waste and pollution. In this work, we designed a sustainable system based on recycling MXene Ti3C2 adsorbent after radioactive cesium (Cs+) uptake and further used it in photocatalytic H2O2 production from seawater. The adsorptive performance and behavior of Ti3C2 were evaluated for model nuclear wastewater with different Cs+ concentrations. Cs+ was uniformly adsorbed on the layer surface of Ti3C2 and promoted the delamination of Ti3C2. Cs+ uptake also improved e––h+ pair separation and photogenerated electron transfer on the Ti3C2 matrix. Without using an organic electron–proton donor and pure O2, Ti3C2 adsorbed Cs+ achieved 892.43 μmol·g–1·h–1 H2O2 productivity in real seawater, which was 1.84 times higher than that over pristine Ti3C2. It also obtained 12.44% apparent quantum yield (AQY) at 550 nm, and 6 cycles of reusability. Enhancement in photocatalytic performance was attributed to the regulation of the bandgap of Ti3C2 by the adsorbed Cs+ from 1.51 eV to a semiconductor range of 2.00 eV. Further, the conduction band (CB) of Ti3C2 was shifted to a more negative potential, facilitating the two-electron reduction of O2 to generate more H2O2. This study opened avenues for the sustainable use of spent adsorbents and resolved freshwater reliance.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
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.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qinghao Song,Zhihao Huang,Ying Xiao,Yu Zhang,Liyi Li,Yi Yu,Si Chen,Qing Wu
MXene Ti 3 C 2 has emerged as a promising biosensing material due to the high surface area, excellent biocompatibility, tunable functional groups (-F, O, -OH), and outstanding electrical conductivity, effectively addressing issues such as low sensitivity and inadequate biocompatibility in sensors. This work, MXene Ti 3 C 2 -AuNPs are synthesized as functional materials through a one-step synthesis method. We propose the first all-fiber biosensor featuring a laterally offset SMF-MMF-SMF-MMF-SMF (SMSMS) interferometric structure functionalized with MXene Ti 3 C 2 -AuNPs as the substrate of the biosensor sensor device, for the detection of the alkane degradation (ALK) gene, to the best of our knowledge. The biosensor enables in-situ target DNA (tDNA) detection across 1 fM to 1 μM concentrations based on this nanoengineered interface, demonstrating 1755.95 nm/RIU sensitivity and a 1 fM limit of detection (LOD) – Two orders of magnitude lower than conventional optical DNA sensors (μM-level). The sensor exhibits a wavelength shift of 1.23 nm in response to complementary DNA, which is 8.2 times greater than that for non-complementary DNA, with a maximum wavelength shift error of 0.11 nm across three repeated experiments and a shift within 0.1 nm over 7 days for sensors with attached functional MXene Ti 3 C 2 , demonstrating excellent specificity, stability, and reproducibility. These advantages render the fiber optic device coated with MXene Ti 3 C 2 -AuNPs an effective solution for ALK gene monitoring and broaden its applicability for ultra-trace DNA detection in environmental and biomedical contexts
研究领域:
生物传感器
·
纳米技术
·
光学传感
·
分子生物学
·
环境监测
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）