Sustainable Energy & Fuels
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2022
·Vol. 6
·期 21
·4938-4947
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IF 6.813
Weiwen Chen,Ziyu Geng,Shicong Zhu,Zenghui Qiu,Xin Zhang,Haijun Xu
Exploration of new MXene-based materials with excellent electrical conductivity and a high redox-active surface as high electrochemical performance supercapacitor electrodes is a very promising field. However, it remains challenging to have electrode materials that feature ultrahigh specific capacitance. In this work, NiO nanoflowers uniformly grow onto a V4C3TX substrate to form a core–shell hierarchical V4C3TX@NiO heterostructure, and then the heterostructure is incorporated into a 3D interconnected porous hydrogel via a hydrothermal graphene oxide (GO)-gelation method at low temperatures. Due to the synergistic effect among each components as well as the significant prevention of the aggregation of V4C3TX, the free-standing V4C3TX@NiO-reduced graphene oxide (RGO) heterostructured hydrogel electrodes exhibit an ultrahigh specific capacitance of up to 1009.5 F g−1 at 1 A g−1, in comparison to those of V4C3TX@NiO (665.3 F g−1) and V4C3TX (184 F g−1), excellent cycling stability (capacity retention rate is 97.4% for the device after 10 000 cycles at 10 A g−1), and a maximum energy density of 61.13 W h kg−1 at a power density of 526.32 W kg−1. This work highlights the unique potential of V4C3TX-based heterostructured hydrogels as inspired electrode materials for low-cost supercapacitor devices.
研究领域:
材料科学
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电化学
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纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Krishnan Subramanyan,Sanming Chen,Na Li,Tingting Ma,Yongping Liu,Sundaram Chandrasekaran,Vanchiappan Aravindan
We report an MXene V 4 C 3 T x new low-voltage insertion anode and a comparison of the electrochemical performance with ester and ether-based electrolytes in half– and full–cell configuration with Na 3 V 2 (PO 4 ) 3 @C (NVPC). Though MXene has been explored for Na-ion batteries (SIB), M n +1 X n T x with n = 3 has been hardly explored. Moreover, the ether-based electrolyte has not been used with any MXenes for electrochemical energy storage , especially in the SIB perspective. The initial irreversibility in the carbonate-based half–cell (V 4 C 3 T x –C) is 128 mAh g −1 more than the tetraglyme–based half–cell (V 4 C 3 T x –T). After 100 cycles, V 4 C 3 T x –T maintains 84 mAh g −1 , while V 4 C 3 T x –C shows only 60 mAh g −1 , which shows the better retention ability in the ether-based system. As for the rate performance, though V 4 C 3 T x –T has a higher capacity in low currents, at higher currents, V 4 C 3 T x –C shows higher values. This showed that the carbonate-based system has diffusion and capacitive-based Na–ion storage, which enabled it to have a high–rate performance. An extensive in–situ impedance study revealed significant formation of the passivation layer in V 4 C 3 T x –C by irreversibly consuming Na–ions, which causes an increased initial Coulombic inefficiency, whereas no such significant SEI layer formation is evident for V 4 C 3 T x –T. Full–cells were assembled with NVPC cathode in tetraglyme and carbonate-based electrolytes. The full–cell with ether electrolyte exhibited enhanced capacity, capacity retention, and rate performance compared to ester-based electrolytes. The full-cell displayed an energy density of ∼66 and ∼74 Wh kg −1 for tetraglyme and ester-based electrolytes, respectively.
研究领域:
材料科学
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电化学
·
储能技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yilin Li,J.M. Cao,Linlin Li,Zeyu Yuan,Dongdong Li,Junzhi Li,Yuming Zhang,Hao Xu,Wei Han,Lili Wang
Materials used for conventional conversion-type anodes usually suffer from poor charge transfer and short lifespan, thereby limiting their utility in sodium-ion batteries (SIBs). To prevent these issues, the development of new anode materials is imperative. Herein, we used a synergistic modification strategy based on pseudo-isotopic substitution and 2D conductive skeleton support, to successfully prepare an unprecedented (Co 0.5 Ni 0.5 )S 2 @V 4 C 3 T x with carbon layer coating (C@NCS@V 4 C 3 T x ) anode materials for SIBs. We noted that the C@NCS@V 4 C 3 T x hybrid exhibited an ultrahigh reversible specific capacity of 705.6 mAh g −1 at 0.1 Ag −1 , and the corresponding reversible capacity that is 100-times higher (10 A g −1 ) at a specific heat capacity of 347.6 mAh g −1 , both higher than those of same kind batteries. Furthermore, the as-prepared hybrid also shows satisfactory long-term cycling stability, resulting from 2D skeleton V 4 C 3 T x MXene with high conductivity and robustness. Through in-situ characterization techniques and density functional theory calculations, the sodium ions storage mechanism was well-investigated, specifically, the synergy effect between the high capacity of bimetallic TMS and metallic conductivity and excellent stability of V 4 C 3 T x MXene plays an important role in high-performance achievement. Thus, assembled C@NCS@V 4 C 3 T x //Na 3 V 2 (PO 4 ) 3 full-cell delivers outstanding electrochemical properties that can be useful as a portable integrated unit for self-powered systems.
研究领域:
材料科学
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电化学
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储能
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纳米材料
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电池技术
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yuxin Xie,Jingjing Zhao,Jingyi Peng,Shubin Li,Xiaojun Han
V 4 C 3 T x MXene/GCE for highly sensitive detection of Cd 2+ , Pb 2+ , and Cu 2+ in water. • LODs of Cd 2+ , Pb 2+ , and Cu 2+ were 2.18 μg/L, 2.02 μg/L and 1.85 μg/L, respectively. • The electrodes possess good reproducibility, storage stability, and selectivity. Water pollution induced by heavy metal ions is growing increasingly severe and endangers human health significantly. Here, a high-performance electrochemical sensor for Cd 2+ , Pb 2+ and Cu 2+ detection in aqueous samples was fabricated by modifying V 4 C 3 T x MXene on a glass carbon electrode (GCE). V 4 C 3 T x was prepared through selective etching, and its structure and chemical compositions were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The results demonstrated that the distinctive two-dimensional lamellar architecture and multivalent vanadium of V 4 C 3 T x MXene provided an ideal platform for efficient heavy metal ion enrichment and electrochemical response. The limit of detection (LOD) was 19.4 nM for Cd 2+ , 9.7 nM for Pb 2+ , and 29.1 nM for Cu 2+ . Besides, the V 4 C 3 T x /GCE was utilized to detect Cd 2+ and Pb 2+ simultaneously, with the LODs to be 24.1 and 12.2 nM. Similarly, the V 4 C 3 T x /GCE was applied for the detection of Pb 2+ and Cu 2+ simultaneously, and the LODs were 12.6 and 34.5 nM, respectively. The V 4 C 3 T x /GCE exhibits excellent repeatability, reproducibility, anti-interference performance and stability, and demonstrates successful application to the analysis of actual water samples. Download: Download high-res image (226KB) Download: Download full-size image
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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
危险品化学品经营许可证（带存储）