ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xin Wang,Shuai Lin,Haiyun Tong,Yanan Huang,Peng Tong,Bangchuan Zhao,Jianming Dai,Changhao Liang,Hai Wang,Xuebin Zhu,Yuping Sun,Shixue Dou
Two-dimensional (2D) MXenes such as Ti 3 C 2 , Ti 2 C, Mo 2 C, and Mo 1.33 C have shown excellent electrochemical performances as supercapacitor electrodes, and the exploration of new and/or high-capacity MXene-based supercapacitor electrode materials is an active field. In this work, 2D multi-layered V 4 C 3 MXene has been synthesized by selectively etching Al from V 4 AlC 3 and it shows a high capacitance of 209 F g −1 at 2 mV s −1 , good rate performance, and stable long cyclic performance with capacitance retention rate of 97.23% after 10000 cycles at 10 A g −1 in 1 M H 2 SO 4 . Importantly, the pseudocapacitance (∼100.1 F g −1 ) accounts for about 37% of the total capacity (∼268.5 F g −1 ) for V 4 C 3 MXene electrode. Therefore, the high specific capacitance of V 4 C 3 MXene is not only due to their wide interlayer spacing (∼0.466 nm), large specific surface areas (∼31.35 m 2 g −1 ) and pore volumes (∼0.047 cm 3 g −1 ), and good hydrophilicity but also attributed to the abundant valence states of vanadium (+2, +3, and +4). The high rate performance and excellent cycling stability of V 4 C 3 MXene electrodes are mainly attributed to the high electronic conductivity (1137 S m −1 at 300 K). The present work provides another promising MXene-based supercapacitor electrode material.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Jiafeng Zhou,Shuai Lin,Yanan Huang,Peng Tong,Bangchuan Zhao,Xuebin Zhu,Yuping Sun
Two-dimensional MXenes (such as Ti 2 C, V 2 C, Nb 2 C, Ti 3 C 2 , and Nb 4 C 3 ) have shown enormous potential in lithium ion storage, and the exploration of new and/or high- performance MXene-based lithium ion storage materials is an active field. This present work demonstrates the synthesis of two-dimensional vanadium carbide V 4 C 3 MXene by selectively etching Al layers from V 4 AlC 3 in hydrofluoric acid at 55 °C. Large specific surface (∼52.1 m 2 g −1 ) and interlayer spacing (∼0.466 nm) can be obtained in V 4 C 3 MXene via adding sufficient ball-milling treatment on precursor V 4 AlC 3 , which is benefit for lithium ion storage. As an anode material for lithium ion batteries, it shows high capacity as well as good rate capability and cycling performance. More specifically, V 4 C 3 delivers a high specific capacity of 225 mAh g −1 after 300 charge/discharge cycles at a current density of 0.1 A g −1 , and 125 mAh g −1 at 1 A g −1 . This work provides another potential MXene-based lithium ion storage material and is expected to inspire more explorations of high-performance MXene-based electrode materials for lithium ion batteries and capacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jiayi Tian,Peng Liu,Yahao Zhao,Wei Zheng,Gen Li,Changchun Han,Wen Liu,Qing Li,Zhijie Den,Xinguo Ma,Furong Ye,Yizhong Huang
Vanadium dioxide (VO2) is a promising material for smart windows due to its metal–insulator transition that enables dynamic solar transmittance modulation. In this study, VO2 (M) nanoparticles were synthesized using a novel approach involving the self-supported structure of V4C3 MXene derived from V4AlC3. Through selective etching, solvothermal oxidation and annealing, VO2 (M) nanoparticles with enhanced thermochromic properties were produced. The self-supported structure of V4C3 MXene significantly reduced particle agglomeration and improved crystallinity, resulting in VO2 (M) films with a luminous transmittance (Tlum) of up to 58.3% and a solar modulation ability (ΔTsol) of 6.3%. The study also demonstrated that film thickness and hydrogen peroxide concentration critically influence optical and thermochromic performance. This study provides a new approach for the preparation of MXene-based VO2 thermochromic smart window materials and is expected to promote their application in the field of building energy conservation.
研究领域:
材料科学
·
能源与建筑节能
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 5
·2291-2300
·
IF 10.733
Xin Wang,Hui Li,Han Li,Shuai Lin,Jin Bai,Jianming Dai,Changhao Liang,Xuebin Zhu,Yuping Sun,Shixue Dou
An energy storage system based on a battery-type electrode and a capacitive electrode as a hybrid supercapacitor offers a promising way to construct devices with advantages of both rechargeable batteries and carbon-based supercapacitors. NiCoAl-LDH nanosheets uniformly grow onto micron-scaled MXene sheets to form a NiCoAl-LDH/V4C3Tx heterostructure with three-dimensional interconnected porous network microstructures by a hydrothermal method. NiCoAl-LDH/V4C3Tx composite electrodes show an excellent specific capacity of 627 C g−1 at a current density of 1 A g−1 in 1 M KOH. Especially, the NiCoAl-LDH/V4C3Tx electrodes exhibit a specific capacity of 300 C g−1 even at a high current density of 20 A g−1 in 1 M KOH, showing excellent rate performance. Hybrid supercapacitors, constructed with NiCoAl-LDH/V4C3Tx as the battery-type electrode and activated carbon (AC) as the capacitive electrode, show superior energy densities of 71.7 and 45.0 W h kg−1 at power densities of 830 and 20 000 W kg−1 in 1 M KOH, respectively. The excellent capacity retention rate is 98% for the hybrid device after 10 000 cycles at 20 A g−1 in 1 M KOH. The NiCoAl-LDH/V4C3Tx heterostructures can be used as promising electrode materials for low-cost hybrid supercapacitor devices.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Haoyuan Zheng,Hua Ning,Chen Jin,Shuzhong Wang,Yadong Wang,Shixuan He,Haizhen Liu,Rui Tang,Xinhua Wang
α -phase AlH 3 , as a high-capacity hydrogen storage material (10.01 wt%), is often used in the hydrogen fuel cell industry. However, its high dehydrogenation temperature remains difficult to match with the operating temperature of proton exchange membranes. Designing efficient catalysts can effectively improve the dehydrogenation performance of AlH 3 , enabling low-temperature dehydrogenation by destabilizing it. In this work, a two-dimensional transition metal carbide V 4 C 3 with a layered structure was designed. Using V 4 AlC 3 as a precursor, two-dimensional V 4 C 3 was prepared via hydrofluoric acid etching. The AlH 3 –V 4 C 3 composite material was constructed by combining V 4 C 3 with AlH 3 through mild ball milling, which significantly enhanced the dehydrogenation performance of AlH 3 . With an optimal additive ratio (+3 wt% V 4 C 3 ), AlH 3 began to release hydrogen at temperatures as low as 47°C, exhibited a dehydrogenation peak temperature of only 110.2°C, and achieved a final hydrogen release capacity of 8.37 wt%. In isothermal dehydrogenation kinetic tests, the dehydrogenation capacity of V 4 C 3 -modified AlH 3 within 60 min at 120°C was significantly increased from 2.11 wt% to 7.50 wt%, and the activation energy for dehydrogenation was reduced from 88.5 kJ/mol to 35.7 kJ/mol, demonstrating remarkable improvement in isothermal dehydrogenation performance. The mechanism behind the improved dehydrogenation of AlH 3 by V 4 C 3 was investigated through a combination of characterization techniques and density functional theory (DFT) calculations. The results indicate that V 4 C 3 effectively weakens the Al-H bonds in AlH 3 , facilitates hydrogen dissociation, and alters the nucleation and growth mechanism of AlH 3 during dehydrogenation. Throughout the entire dehydrogenation process, V 4 C 3 remains chemically stable and enhances the dehydrogenation kinetics of AlH 3 via interfacial catalysis. The aforementioned approach effectively improves the overall dehydrogenation performance of AlH 3 , providing a novel paradigm for enhancing light-metal high-capacity hydrides.
✓ 已验证
DOI
高影响因子
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