ChemSusChem
·
2018
·Vol. 11
·期 21
·3758-3765
·
IF 7.411
Jiapeng Liu,Tao Chen,Peng Juan,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Graphical Pushing to the edge : Two-dimensional Ti 3 C 2 T x supported cobalt borate (Co-Bi) is a potential catalyst for oxygen evolution reaction in alkaline medium. The Co-B i /Ti 3 C 2 T x hybrid displays a hierarchical structure enabling improved exposure of active surface sites, mass diffusion, and charge-transfer characteristics. Consequently, the hybrid material can deliver a stable current density (10 mA cm −2 ) at a low overpotential (250 mV). Oxygen evolution reaction (OER) is a key reaction for many renewable energy storage and conversion techniques. Developing efficient non-precious metal-based electrocatalysts for OER has attracted increasing attention. Herein is reported a strategy to fabricate hierarchical cobalt borate/Ti 3 C 2 T x MXene (Co-B i /Ti 3 C 2 T x ) hybrid through fast chemical reactions at room temperature. This interesting hierarchical structure of Co-B i /Ti 3 C 2 T x hybrid is beneficial for exposing more active sites, improving mass diffusion, and charge-transfer pathways for electrochemical reaction. Moreover, a strong interaction between Co-B i and Ti 3 C 2 T x ensures efficient charge transfer and facilitates the electrostatic attraction of more anionic intermediates for a fast redox process. Consequently, the hierarchical Co-B i /Ti 3 C 2 T x hybrid shows extraordinary OER catalytic activity to deliver a current density of 10 mA cm −2 at an overpotential of 250 mV, and a Tafel slope of about 53 mV dec −1 .
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiaolong Lu,Zhiwei Xu,Yi Shi,Qi Wang,Jialu Jia,Nan Sun,Bijun Fang,Ningyi Yuan,Jianning Ding
Structure engineering gives rise to tremendous opportunities for creating materials with marvelous morphologies and properties. Limited by the unique etching preparation method and vulnerable resistance to oxidation , structure engineering of MXenes, especially, mesoporous morphology construction, remains an obstacle. Here, we put forward a facile strategy to fabricate mesoporous MXene nanosheets by microexplosion process assisted uneven sheets exfoliation and quantum dots detaching, with left structure voids acting as mesopores. The universality of proposed strategy for different MXenes, including Ti 3 C 2 , Nb 2 C and Ti 2 C, was also testified. As a concept of proof, the distinct mesostructures provide abundant active sites and improve ion diffusion kinetics, thus boosting the energy storage performance of Ti 3 C 2 MXenes. This work not only sheds new light to the fabrication of mesoporous MXenes, but also demonstrates performance optimization through structure engineering.
研究领域:
材料科学
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纳米技术
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能源存储
✓ 已验证
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Ningjun Chen,Zhongyi Duan,Wenrui Cai,Yongbin Wang,Ben Pu,Haichao Huang,Yanting Xie,Qi Tang,Haitao Zhang,Weiqing Yang
MXenes as an emerging 2D materials have attracted significant attention in the fields of energy storage, sensing, etc. However, superlong time-consuming (several days) and low-production (⁓ 1 g) of dangerously F-contained acid etching method intrinsically make it inapplicable for large-scale manufacture of MXenes. Herein, we propose a supercritical etching method for the mass preparation of various MXenes assisted by supercritical carbon dioxide . The enhanced thermal power of supercritical carbon dioxide molecules helps significantly accelerate the etching rate of the MAX phase and increase the layer spacing of MXenes. As a result, five typical MAX materials (Ti 3 AlC 2 , Nb 2 AlC, Ti 2 AlC, Mo 2 Ga 2 C, and Ti 3 AlCN) can be exfoliated into the corresponding MXenes (Ti 3 C 2 T x , Nb 2 CT x , Ti 2 CT x , Mo 2 CT x , and Ti 3 CNT x ) with the yield of ∼ 1 Kg within 2–5 h. We further developed a Ti 3 C 2 T x -based Na-ion battery with a remarkable capacity of 100 mAh g −1 at 100 mA g −1 (70 mAh g −1 at 1000 mA g −1 ) and excellent coulombic efficiency of nearly 100%. The proposed supercritical etching strategy provides a platform for the commercial production of MXenes.
研究领域:
材料科学
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能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2024
·
IF 6.4
Xin Hou,Penggang Ren,Wenhui Tian,Runzhuo Xue,Wu Tong,Zhengyan Chen,Fang Ren,Yanling Jin
Carbon materials have become a focal point in supercapacitors (SCs) due to their perfect charge–discharge behavior, relatively low cost, and excellent electrochemical stability, but the limited electrochemical activity restricts their further development. MXenes (Ti 3 C 2 T x ) combine high electrical conductivity, hydrophilicity, and abundance surface functional groups, which contribute to high energy density when compounded with carbon materials. In this work, carbon material derived from mineral water bottles is modified with cetyltrimethylammonium bromide (CTAB) that spontaneously forms into porous heterogeneous structures with Ti 3 C 2 T x under electrostatic interactions. The carbon material hinders the reaggregation of Ti 3 C 2 T x , while Ti 3 C 2 T x increases the electrochemical activity on the surface of the carbon material. A hierarchical porous carbon with a large specific surface area of 1754.3 m 2 g −1 , promoting the electrolyte migration kinetics and high specific capacitance in 6 m KOH electrolyte (404.1 F g −1 at 1 A g −1 ). The symmetric SC made as-prepared carbon electrode shows an extended voltage window (1.8 V), an optimal energy density (31.19 Wh kg −1 at a power density of 450 W kg −1 ) and a low capacitance decay (1% after 15 000 cycles) in 1.5 m Na 2 SO 4 . The preparation of electrode material with a unique structure provides a practical and innovative strategy for the value-added utilization of waste plastics.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Peijiang Liu,Zhengjun Yao,Vincent Ming Hong Ng,Jintang Zhou,Ling Bing Kong,Kan Yue
Although two dimensional (2D) materials have already been studied as promising microwave absorption materials due to fascinating layered structure, it is hard to achieve both thin coating and excellent absorbing capability. Herein, 2D hierarchical composites of nano-sized Fe 3 O 4 particles on MXenes (TiO 2 /Ti 3 C 2 T x /Fe 3 O 4 ) with different [TiO 2 /Ti 3 C 2 T x ]/[Fe 3 O 4 ] ratios were synthesized by using a moderate chemical hydrothermal reaction. Scanning electron microscope and transmission electron microscope techniques indicated that the surfaces of MXenes were densely covered with Fe 3 O 4 nanoparticles of ∼4.9 nm in diameter and TiO 2 particles. By tuning the ratio of [TiO 2 /Ti 3 C 2 T x ]/[Fe 3 O 4 ], microwave absorption capabilities in terms of the maximum reflection loss ( R L ) value and absorber thickness could be readily optimized. Specifically, the sample TiO 2 /Ti 3 C 2 T x /Fe 3 O 4 -5 exhibited a remarkable absorption performance, with a maximum reflectivity of −57.3 dB at 10.1 GHz and a band range below −10 dB to over 9.1–11.1 GHz at a thickness of 1.9 mm. Therefore, our 2D MXene composites are expected to be promising candidates as ultrathin and lightweight absorbing materials.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Kunpeng Qian,Shuang Li,Jianhui Fang,Yuhuan Yang,Shaomei Cao,Miao Miao,Xin Feng
Ti 3 C 2 T x MXenes with excellent metallic conductivity and flexibility have shown a promising prospect as electromagnetic interference (EMI) shielding materials. Ultrathin, hierarchical hybrid films were fabricated by using C 60 intercalating Ti 3 C 2 T x MXenes with the assistance of water-soluble γ -cyclodextrin (CD). The C 60 /CD complex was obtained by high-speed vibration milling using hydrophilic CD as dispersing agent. After thermal annealing treatment, the obtained hybrid film exhibited excellent EMI shielding (53.52±0.43 dB), hydrophobicity (water contact angle: 93.7°) and mechanical stability (over 0.9 million bending times). Taking advantage of the antioxidant of C 60 , the chemical durability of Ti 3 C 2 T x MXenes based hybrid films was also improved as expected. These results indicate that the well-designed hierarchical hybrid films with the intercalation of C 60 have promising potential for high-performance EMI shielding applications.
研究领域:
材料科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Hanchen Xu,Hongwei Shou,Ziwei Yan,Kefu Zhu,Chuanqiang Wu,Wei Jiang,Zhanfeng Liu,Shiqiang Wei,Jialin Shi,Hassan Akhtar,Changda Wang,Li Song
Two-dimensional transition metal carbides and nitrides (MXenes) have attracted significant attention due to their exceptional physicochemical properties. Despite extensive studies, efficient methods for the production of MXenes with precise structural control still remain a challenge, thus hindering their potential in many specific applications. Herein, a halogen ion-mediated hydrothermal approach is proposed for the controllable preparation of diverse MXenes and their heterostructures with well-defined interfacial architectures, demonstrating its potential as a high-throughput synthesis strategy. As proof of concept, Mo 2 C can be synthesized on a gram scale by employing NH₄F in the hydrothermal etching process of Mo 2 Ga 2 C. Subsequently, this approach is applied to various MXenes, including Ti 3 C 2 , V 2 C, and Nb 4 C 3 . Moreover, NH 4 X (X = Cl, Br, I) etchants combined with small-molecule intercalants enabled the targeted synthesis of MXene-based heterostructures, such as Mo 2 CT x @MoS 2 featuring ≈15 nm amorphous MoS 2 surface layers. Notable, the Mo 2 CT x (Br) heterostructure exhibited outstanding electrochemical stability, delivering a capacity of 465.5 mAh g⁻¹ after 300 cycles at 1 A g⁻¹, and achieving high coulombic efficiency of 99.8% during lithium-ion battery cycling. This work establishes a versatile and scalable platform for the synthesis of MXene-based materials, thus paving the way for accelerating their potential in various fields.
研究领域:
材料科学
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纳米技术
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电化学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2024
·
IF 5.8
Lei Sun,Rong Sun,Jianjun Liu,Mengzhou Zhu,Xiaoqin Zhang,Dongliang Guo,Kangyong Yin,Zhiyun Zhuang,Xueqiong Zhu,Peng Xiao
MgH2 used in solid-state hydrogen storage still suffers from high thermal stability and slow hydrogen absorption–desorption kinetics. Here, we report a hybrid of MgH2–Ti3C2/graphene prepared through a facile wet chemical method followed by a ball-milling method. It was confirmed that the coupling of Ti3C2 and graphene possesses a synergistic effect on the hydrogen desorption and absorption reactions of MgH2/Mg. The initial temperature of MgH2–Ti3C2/graphene to desorb hydrogen was reduced to 169 °C significantly and it could desorb 6.8 wt% H2 within 6 min at a constant temperature of 300 °C. Moreover, the desorbed sample could start to absorb hydrogen at room temperature and achieve a capacity of 6.0 wt% when the temperature was gradually increased to 350 °C. These results are far superior to pristine MgH2, disclosing that the addition of two-dimensional Ti3C2/graphene is an efficient strategy to boost the hydrogen storage performance of MgH2.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Xinliang Li,Mian Li,Kan Luo,Yue Hou,Pei Li,Qi Yang,Zhaodong Huang,Guojin Liang,Ze Chen,Shiyu Du,Qing Huang,Chunyi Zhi
Dendrite growth and low Coulombic efficiency caused by uneven diffusion and electrodeposition of Zn2+ ions have emerged as a barrier to exploit the Zn metal anode. In this work, we demonstrate the stoichiometric halogenated MXenes (Ti3C2Cl2, Ti3C2Br2, and Ti3C2I2) as an artificial layer that can induce the uniform Zn deposition. The efficient redistribution effect results from the coherent heterogeneous interface reconstruction and regulated ion tiling by halogen surficial termination. The synergetic effects of high lattice matching (90%) between the adopted MXenes and Zn, as well as the positive halogen regulation, Zn2+ ions are guided to nucleate uniformly on the most extensive (000l) crystal plane of the MXene matrix and grow in a planar manner. In terms of Zn ion regulation, Cl termination is found to be more effective than O/F, Br, and I due to its moderate adsorption and diffusion coefficiency for Zn2+ ions. The Ti3C2Cl2–Zn anode achieves a life extension of over 12 times (840 h at 2 mA cm–2//1 mAh cm–2) over that of the bare Zn anode and serves more than 9000 cycles in a battery with a Ti3C2I2 cathode at a high rate of 3 A g–1. Given the abundance of lattice parameters and terminations of MXene materials, the developed strategy is expected to be extended to other metal anode systems.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-13
·
IF 5.3
Zhao Zhihua,Su Zijie,Lv Zhenli,Shi Pu,Jin Guixin,Wu Lan
Bi 2 S 3 /Ti 3 C 2 T x nanomaterials were successfully prepared through a simple hydrothermal method. Various methods were used for their characterization, including XRD, XPS, SEM, EDS, and BET, along with testing their gas-sensing properties. The results showed that the response value to 100 ppm ammonia at room temperature reached 107%, which was 14.1 times higher than that of pure few-layer MXene. After undergoing anti-humidity interference testing, we observed that Bi 2 S 3 /Ti 3 C 2 T x exhibited a higher response value in real-time monitoring of ammonia as humidity increased. Specifically, under 90% humidity conditions, its response value reached 1.32 times that of normal humidity conditions. This exceptional moisture resistance ensures that the sensor can maintain stability, and even exhibit superior performance, in harsh environments. Therefore, it possesses excellent selectivity, high-moisture-resistance, and long-term stability, making it significant in the field of medical and health monitoring. Graphical abstract
研究领域:
材料科学
·
医学监测
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产品关联
DOI
PubMed
高影响因子
Materials Today
·
2025
·
IF 22
Jikai Zhang,Yi Tao,Yuxuan Ye,Haiyang Wang,Xinping Wu,Zicheng Luo,Yu Shi,Qi Zhao,Zongju Cheng,Yu Guo,Bin Li,Bo Mai,Qinyou An,Xiansheng Zhang,Zhiguo Du,Shubin Yang
Although 2D transition-metal carbides (MXenes) are usually synthesized by selective etching and chemical vapor deposition approaches, they are limited by the slow reaction kinetics, resulting in their continuous production challenging. Here, we demonstrate a bubbling chemical vapor growth (BCVG) method to continuously produce Cl-terminated MXenes by the reaction of CH 4 and TiCl 4 chemical bubbles with titanium powder in a molten salt. In the molten reaction system, titanium powder would effectively react with TiCl 4 to form highly active [TiCl 6 ] y – with low Ti Cl bond dissociation energies. The multivalent [TiCl 6 ] y – could efficiently incorporate the carbon species from CH 4 to form [Ti 6 CCl 18 ] clusters on the surface of bubbles in a low energy barrier, efficiently promoting the reaction kinetics. Subsequently, Cl-terminated MXenes were produced based on the following condensation reaction of [Ti 6 CCl 18 ] clusters. The resultant MXene (Ti 2 CCl x ) exhibits an expanded structure with strong interfacial polarization between its basal planes and the polymer matrix, delivering a good electromagnetic wave absorption performance with a minimum reflection loss (RL min ) value of –52.2 dB at a thin thickness of 2.84 mm.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 24
·16438-16445
·
IF 3.3
Zhiwei Yang,Lijuan Dong,Qian Chen,Zeyi Wang,Jiacheng Cao,Mengwei Dong,Jian Wang,Jian Zhang,Xiao Huang
Although titanium-based MXenes have been widely reported for gas sensing, the effect of crystal stoichiometric variations on the sensing properties has been rarely reported. Herein, stoichiometric polymorphs of titanium carbide MXenes (i.e., Ti3C2Tx and Ti2CTx) loaded with Pd nanodots (NDs) prepared by photochemical reduction were investigated for room-temperature H2 sensing. Interestingly, we found that Pd/Ti2CTx exhibited greatly enhanced sensitivity to H2, along with faster response and recovery rates compared to Pd/Ti3C2Tx. The H2 adsorption induced resistance change in Pd/Ti2CTx was higher than that of Pd/Ti3C2Tx due to the more effective charge transfer at the heterointerface of Pd/Ti2CTx, which was confirmed by shifts of binding energies and theoretical calculation results. We hope this work could be helpful to design more high-performance MXene-based gas sensors.
研究领域:
材料科学
·
传感器技术
·
表面化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）