Journal of Materials Chemistry A
·
2024
·
IF 10.7
Chuhan Huang,Tianqin Huang,Xue Liang Li,Wei Zhou,Meng Ding
Two-dimensional transition metal carbides/nitrides (MXenes) have gained considerable prominence in capacitive deionization (CDI) due to their exceptional electrochemical activity and outstanding electronic conductivity. However, the further development of MXenes in practical applications in CDI is hampered by their limited narrow interlayer spacing and oxidation proneness. Herein, a dual-functional surface modification of Ti3C2Tx MXene by sodium ascorbate (SA) is proposed to concurrently enhance the salt adsorption capacity and long-term stability. The modification by SA induces synergistic functions, including the enlargement of interlayer spacing, effective protection of Ti from oxidation, and exceptional electrical conductivity. Simultaneously, this film electrode is designed to be flexible and free-standing, devoid of binders or adhesives, showing promise for the large-scale production of CDI electrodes. Benefiting from these advantages, the SA-modified MXene exhibit excellent desalination performance, including high salt adsorption capacity (109.6 mg g−1), high salt adsorption rates (17.5 mg g−1 min−1), and impressive cycling stability (100% retention after 80 cycles). And the adsorption behavior of SA-modified MXenes is further investigated by in situ X-ray diffraction and density functional theory calculations. This work proposes an effective modification and explores theoretical aspects for fabricating MXene-based electrodes suitable for CDI and other electrochemical applications in moist or aqueous environments.
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Junyu Lu,Lei Xu,Cheng Xie,Qun Wei,Qilin Jiang,Guangsheng Yao,Zhaohui Han
The rapid development of modern wireless communication technology makes electromagnetic wave pollution increasingly serious, necessitating the development of high-performance electromagnetic wave-absorbing materials. This study introduces a Ti 3 C 2 T x MXene hybrid carbon foam (HCF) that exhibits a tunable and efficient electromagnetic wave absorption performance. The HCF features a porous, multilayered structure, which enhances its multi-reflection properties, and a heterogeneous interface between the carbon foam and MXene boosting its dielectric loss. By regulating the content of MXene, the ratio of polarization loss to conduction loss can be regulated to achieve better impedance matching. As a result, the HCF demonstrated superb electromagnetic wave absorption performance with RL min = −72.25 dB and EAB max = 6.55 GHz. Furthermore, the minimum absorption frequency domain could be tuned within 8–14 GHz by varying the MXene content. The performance in radar wave absorption and electromagnetic-thermal conversion (ramp rate 85.81 °C/s from RT to 200 °C) proves that HCF is an efficient and reliable electromagnetic wave absorber, suitable for radar technology, microwave heating, and communication systems applications.
研究领域:
材料科学
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电磁学
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纳米技术
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通信技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
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IF 18.027
Rui Ma,Xujing Zhang,Jingting Zhuo,Lingyun Cao,Yutong Song,Yajiang Yin,Xiaofeng Wang,Guowei Yang,Fang Yi
MXenes have shown great potential for supercapacitor electrodes due to their unique characteristics, but simultaneously achieving high capacitance, rate capability, and cyclic stability along with good mechanical flexibility is exceptionally challenging. Here, highly enhanced capacitance, rate capability, and cyclic stability, as well as good mechanical flexibility for T3C2Tx MXene-based supercapacitor electrodes are simultaneously obtained by engineering the electrode structure, modifying the surface chemistry, and optimizing the fabrication process via an optimized integration approach. This approach combines and more importantly optimizes three methods that all require a calcination process: carbonizing in situ grown polymer (“Cpolymer”) on the MXene, alkali treatment (“A”), and template sacrificing (“P”); and the optimized processes lead to more abundant active sites, faster ion accessibility, better chemical stability, and good mechanical flexibility. The obtained P-MXene/Cpolymer-A electrodes are binder-free and self-supporting and not only have good mechanical flexibility but also demonstrate much larger capacitances and better rate performance than the pristine MXene electrode. Specifically, the P-MXene/CPAQ-A electrode (PAQ: quinone-amine polymer) achieves a high capacitance of 532.9 F g–1 at 5 mV s–1, together with superior rate performance and improved cyclic stability (97.1% capacitance retention after 40 000 cycles at 20 A g–1) compared with the pristine MXene (79.6% retention) and P-MXene-A (77.3% retention) electrodes. In addition, it is discovered that carbonizing in situ grown polymers can variously remove the −F group and the removal effect can be accumulated with that by the alkali treatment.
研究领域:
材料科学
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电化学
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能量存储
✓ 已验证
DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2025
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IF 9.8
Mengru Liu,Taotao Zhe,Limin Zhu,Fan Li,Kaixuan Ma,Chenyu Xuan,Qinlin Feng,Shaohui Ouyang,Li Wang
The contamination of nitrofurantoin (NFT) antibiotics in the food chain poses significant threats to environmental and public health, emphasizing the urgent need for rapid and portable detection. This study presents an electrochemical sensor based on a 2D/2D van der Waals heterojunction of VS 2 and Ti 3 C 2 T x MXene integrated onto a screen-printed carbon electrode (SPCE). Interfacial engineering of Ti S bonds creates efficient charge transfer pathways and a directional built-in electric field, enhancing charge dynamics and electroreduction efficiency. The VS 2 /Ti 3 C 2 T x MXene-SPCE sensor shows an ultralow detection limit of 4.7 nM, a wide linear range (0.01–400 μM), and high stability with strong resistance to interference. Its practical applicability was validated by successful NFT detection in tap water, lake water, milk, and honey, yielding satisfactory results. This work highlights the catalytic potential of VS 2 / Ti 3 C 2 T x MXene heterojunctions and demonstrates the sensor as a promising tool for environmental monitoring and food safety.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 38
·21771-21778
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IF 12.732
Lan-Xin Li,Wu-Ji Sun,Hao-Yu Zhang,Jia-Liang Wei,Shu-Xian Wang,Jing-Hui He,Na-Jun Li,Qing-Feng Xu,Dong-Yun Chen,Hua Li,Jian-Mei Lu
The efficient electroreduction reaction of nitrate (NO3−RR) at low concentrations to ammonia is energetically favorable for ammonia production and environmentally essential to treat water contamination. Copper-based conjugated molecule electrocatalysts for the NO3−RR are advantageous in terms of their customizable Cu-coordinative micro-environment and facile preparation; however, they easily agglomerate due to their large π-conjugating system, which severely lowers the active site density and increases the internal resistance. This study demonstrates that Ti3C2Tx MXenes are promising supports to disperse and anchor a molecular catalyst (copper phthalocyanine, CuPc) to construct a CuPc@MXene electrocatalyst in order to significantly promote NO3−RR performance. 10% CuPc@MXene achieved higher ammonia selectivity (94.0%) and higher nitrate conversion (90.5%) compared to those of unsupported CuPc, and retained high ammonia selectivity (∼80%) after seven recycling tests. The combination of online differential electrochemical mass spectroscopy (DEMS) and density functional theory (DFT) calculations has showed that CuPc molecules are able to inhibit the hydrogen evolution reaction and effectively convert nitrate into ammonia through the ONH reaction pathway. The results showed that the MXene support is applicable to many metal phthalocyanines (MPcs, M = Fe, Co, Ni), demonstrating its potential in other electrochemical catalysis applications.
研究领域:
电化学
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环境科学
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材料科学
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催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Ziheng Ye,Feihua Liu,Xiaoai Ye,Kaizheng Gao,Jingjing Luo,Xiangli Liu,Weiwei Zhao
Ti 3 C 2 T x MXene with outstanding physicochemical properties have shown huge potential in electromagnetic interference (EMI) shielding applications. However, the poor chemical stability and mechanical fragility have seriously hindered their practical use. Herein, we developed a novel pyrimidine-containing polyimide (PPI) and constructed Ti 3 C 2 T x /PPI (MP) composite films . The incorporation of PPI not only suppresses the oxidation of Ti 3 C 2 T x by forming Ti-N x interactions between the nitrogen-rich pyrimidine rings of PPI and the Ti centers of Ti 3 C 2 T x , but also enhances mechanical strength and durability of the composite film across a wide temperature range (-196–250 ℃). Compared with Ti 3 C 2 T x film, the MP film exhibits significantly improved oxidation resistance , which the EMI SE of MP film did not decrease after 14 days in 80 ℃/80 RH environment when the weight ratio of Ti 3 C 2 T x and PPI reaches 11:4. Merely 1.4 dB decrease in EMI SE of the MP film was revealed after 200,000 bending cycles with a radius of 2 mm, and the EMI SE remained virtually unchanged after bending in liquid N 2 . Moreover, the composite film demonstrates excellent thermal management properties, including rapid thermal response, efficient electrothermal conversion, excellent durability and stability. The combination of desirable EMI shielding ability, ultrahigh flexibility, superior stability and durability, as well as ideal thermal management performance gives this material excellent potential for various applications.
研究领域:
材料科学
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高分子化学
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纳米复合材料
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电磁学
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热物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 17
·6086-6097
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IF 5.7
Yuanhao Ning,Shuang Yang,Xianxian Sun,Shasha Wang,Lei Liang,Yuanjing Cheng,Ye Yuan,Yibin Li
Transition metal carbides and nitrides (MXenes) with excellent properties have broad prospects in electromagnetic wave absorption (EMA). In this paper, a unidirectional freeze-casting method was utilized to design a double-layer MXene absorber with orthogonal microstructures. The perpendicular and parallel samples (associated with the unidirectional freeze-casting direction), perform their respective roles in the designed double-layer absorber. The perpendicular sample with various attenuation techniques is employed as an electromagnetic wave attenuation layer, while the parallel sample with good impedance matching conditions is utilized as an impedance matching layer. Consequently, the entire absorber exhibits favorable EMA characteristics. Upon incidence of electromagnetic waves onto the parallel terminus, it is observed that the sample measuring 4.6 mm in thickness exhibits a minimal reflection loss (RLmin) of −60.8 dB at a frequency of 6.63 GHz, with a parallel end thickness accounting for 25%. In addition, the sample with a thickness of 2.6 mm displays a noteworthy maximal effective absorption bandwidth (EAB) amounting to 9.4 GHz, given a parallel end thickness of 20%. A thorough analysis of the impedance matching conditions and electromagnetic wave attenuation mechanisms of each sample reveals that the double-layer MXene absorbers with orthogonal microstructures can significantly increase the viability of MXenes in EMA.
研究领域:
材料科学
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电磁工程
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wei Zheng,Zequn Yang,Jiefeng Chen,Mingguang Zhang,Hongxiao Zu,Ruiyang Qin,Wenqi Qu,Jianping Yang,Lijian Leng,Hailong Li
Utilization of monolithic mineral sulfide-based sorbent for the fix-bed elemental mercury (Hg 0 ) removal is regarded as a predominant predicament in the field of Hg 0 abatement. In this work, a general and facile route was exploited to establish CuS particles decorated 3D porous Ti 3 C 2 T x MXene aerogel via divalent Cu 2+ cations induced assembly combined with subsequent high-temperature sulfurization treatment, during which, uniform CuS particles were homogeneously anchored throughout the Ti 3 C 2 T x substrate. The obtained 3D CuS/Ti 3 C 2 T x MXene aerogel exhibited satisfactory textural property, hierarchical pore structure and strong interaction between Ti 3 C 2 T x MXene and CuS. Meanwhile, the inherent restacking of Ti 3 C 2 T x MXene nanosheet and serious agglomeration of CuS can also be effectively avoided in the formation of aerogel. Those structural advantages originating from this novel gelation process favorably contributes to satisfactory Hg 0 mass transfer and sufficient utilization of CuS active ligands, which largely strengthens Hg 0 removal performance and broadens the fix-bed application of mineral sulfides. Consequently, the Hg 0 capture capacity and adsorption rate of CuS/Ti 3 C 2 T x MXene aerogel reached 90596.4 g m −3 and 120.64 g m −3 min −1 , respectively, far outbalancing those of the reported in-situ selenized copper foam with excellent Hg 0 removal activity. The impressive Hg 0 sequestration performance is attributed to its relatively large specific surface area, layered pore channel, and highly dispersed CuS particles, largely boosting Hg 0 mass transfer and following sequestration. Moreover, other mineral sulfides/Ti 3 C 2 T x MXene aerogels can also be constructed by just replacing divalent metal cations, which makes the initial effort towards the fix-bed utilization of mineral sulfides-based aerogel for vapor-phase Hg 0 immobilization.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Gangbing Zhu,Jieling Hou,Juan Xu,Jing Li,Chenxu Wang,Yinhui Yi
Background Heavy metal pollution poses a serious threat to the ecological environment. Mercury ion (Hg 2+ ) is a class of highly toxic heavy metal ions, which is bioaccumulative, difficult to breakdown, and has a significant affinity with sulfur and thiol-containing proteins, which seriously affects environmental safety and human health. Nanozyme-based sensing methods are expected to be used to detect toxic heavy metal ions. However, the application of precious metal nanozymes to develop portable sensors with simplicity, high stability, and high sensitivity has not been explored to a large extent. Results In this paper, based on MXene's unique adsorption capacity for certain precious metal ions, PtNPs/Ti 3 C 2 T X NR composites were successfully prepared by in-situ growth of Pt nanoparticles (PtNPs) on the surface of Ti 3 C 2 T X MXene nanoribbons (Ti 3 C 2 T X NR) using the hydrothermal technique. Experimental data revealed PtNPs/Ti 3 C 2 T X NR exhibited superior peroxidase-like activity, attributed to the synergistic effect of well-dispersed ultrasmall PtNPs and electron transfer effect. Hg 2+ can significantly inhibit enzyme-like activity of PtNPs/Ti 3 C 2 T X NR due to specific capture and partial in-situ reduction of PtNPs, so a colorimetric sensor was constructed for ultra-trace detection of Hg 2+ with a linear range of 0.2 nM and 400 nM. Furthermore, using the portable detecting capabilities of smartphones and hydrogel, a smartphone-assisted hydrogel sensing platform of Hg 2+ was constructed. Notably, the two-mode sensing platforms exhibited outstanding detection performance with LOD values as low as 15 pM (colorimetric) and 26 pM (hydrogel), respectively, superior to recently reported nanozyme-based Hg 2+ sensors. Significance Compared with other methods, the PtNPs/Ti 3 C 2 T X NR-based dual-mode sensor designed in this paper has superior sensitivity, high selectivity, simple operation and portability. In particular, the dual-output sensing strategy enables self-confirmation of detection results, greatly improving the reliability of the sensor, and is expected to be used for the on-site determination of trace mercury ions.
研究领域:
环境科学
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纳米技术
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Jin Duan,Zhe Liu,Xiuchen Wang
Developing flexible materials with combined electromagnetic interference (EMI) shielding and microwave absorption capabilities holds significant application potential. Ti 3 C 2 T x MXene has emerged as a flexible EMI shielding material due to its thinness, adhesion, flexibility, and dual shielding and absorption properties. High conductivity-induced reflection and layered self-stacking challenges hinder Ti 3 C 2 T x MXene performance enhancement, posing challenges demanding solutions. This study first uses simulations to analyze how functional group modifications and interlayer spacing affect Ti 3 C 2 T x MXene's electromagnetic properties. Hydroxyl groups are proposed as key regulators of Ti 3 C 2 T x MXene's properties. Subsequently, Ti 3 C 2 T x MXenes were treated with a low-concentration NaOH gradient to modulate hydroxyl groups. Ultrasonic-microwave extraction resolved delamination, enabling ultra-thin film preparation. The treatment caused hydroxyl groups to initially increase and then decrease, with interlayer spacing first contracting and then expanding, achieving synchronous modulation of Ti 3 C 2 T x MXene's surface functional groups and interlayer spacing. The EMI shielding and microwave absorption of ultrathin films were analyzed, with shielding efficiency correlating positively with hydroxyl group concentration. Ti 3 C 2 T x MXene treated with 0.2 mol/L NaOH exhibited maximum hydroxyl concentration, achieving 48.965 dB shielding at 0.016 mm thickness (SE/t = 3060.320 dB/mm), demonstrating hydroxyl groups' role in improving shielding performance. Wave absorption increased with higher NaOH concentrations, correlating with surface hydroxyl groups. The 0.3 mol/L NaOH-treated MXene showed a 12.883 dB absorption increase versus untreated samples. Additionally, the green shielding index (g s ) of Ti 3 C 2 T x MXene films increased by 32.9 % with higher NaOH concentration. Results demonstrate that surface hydroxyl modification and layer spacing adjustment significantly enhance the EMI shielding and wave absorption of Ti 3 C 2 T x MXene. Meanwhile, the prepared thin, flexible products have potential applications in aerospace, defense, and flexible electronics.
研究领域:
材料科学
·
电磁学
·
纳米技术
·
应用物理
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Wei Yang,Qiankun Han,Wenshi Li,Maosheng Wu,Jing Yao,Man Zhao,Xianmao Lu
Redox-enhanced electrochemical capacitors (redox ECs) are promising energy-storage devices with the potential to deliver both high power and energy performances, although overcoming the severe self-discharge remains a great challenge due to the shuttle effect of redox species such as I − /I 3 − ions introduced in the electrolytes for gaining additional capacities. Herein, we propose a cation-initiated self-assembly process of Ti 3 C 2 T x MXene nanosheets onto glass fiber membranes to form Janus separators that can mitigate the shuttling of I − /I 3 − ions in iodine-based redox ECs. The interlayer spacing of the MXene films can be controlled by selecting different cations such as imidazolium (C 4 mim + ), Mg 2+ , and Al 3+ , therefore the resulting Janus separators exhibit tailored nanochannels for ion sieving. Both molecular dynamic (MD) simulations and electrochemical tests indicate that C 4 mim + -intercalated MXene Janus separators (C 4 mim + -MXene) can block the diffusion of I 3 − ions while allowing the pass of other electrolyte ions. As a result, self-discharge caused by the shuttle effect can be much reduced in C 4 mim + -MXene-based redox ECs, which deliver voltage and energy retentions substantially higher than that of the cells using glass fiber membrane separators (voltage retention: 70% vs. 10%, energy retention: 51% vs. 6.5%) after 24-h open-circuit test.
研究领域:
材料科学
·
储能技术
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zhixin Jia,Jingbin Zhang,Zengtao Ji,Jiaran Zhang,Xinting Yang,Ce Shi,Xia Sun,Yemin Guo
Hydrogen sulfide (H 2 S) contamination of food has raised widespread public health concerns, leading to substantial medical and economic burdens. Herein, a 2D/0D heterojunction fluorescent probe (TCTG) with Schottky barriers (SB) is designed and synthesized, utilizing Ti 3 C 2 T x MXene-loaded graphene quantum dots (GQDs), for the detection of H 2 S during food spoilage. The microstructures observed through SEM and TEM reveal that uniformly sized GQDs are evenly attached to the surface of a monolayer Ti 3 C 2 T x . The chemisorption between GQDs and Ti 3 C 2 T x facilitates charge transfer and the formation of SB, resulting in intramolecular charge transfer (ICT) effects. With the introduction of H 2 S, TCTG (50%) exhibits the highest sensitivity, selectivity, and anti-interference properties, with ultra-fast fluorescence transient reaction (3s) and remarkably low detection limit of 41.82 ppb as well as noticeable color change. When TCTG (50%) reacted with H 2 S, the ICT effects are inhibited, leading to the recovery of photoinduced electron transfer (PET) and fluorescence quenching. Notably, probe TCTG is effectively utilized to detect changes in H 2 S levels in raw foods to assess their quality. Overall, the significance of this study is its potential to revolutionize food spoilage detection, offering a fast, reliable, and sensitive method to ensure food safety and reduce associated health and economic burdens.
研究领域:
材料科学
·
分析化学
·
食品科学
·
环境科学
✓ 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）