NANO
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2018
·
IF 1.1
Huagen Li,Shubin Wang,Mengjie Feng,Jiping Yang,Boming Zhang
Herein, we report a hierarchical structure formed by wrinkled reduced graphene oxide (rGO) sheets-wrapped carbon fiber via a facile and efficient electrostatic self-assembly method and subsequent annealing treatment. For this material, the Weibull scale parameter is 4.77 GPa. After 100 cycles, the rGO@CF retains 91% of its second charge capacity at 50 mA ⋅g −1 , corresponding to a capacity fading of only 0.09% per cycle. Thus, this structural anode material exhibits enhanced capacity, high initial Coulombic efficiency and high tensile strength. Meanwhile, the carbon fiber and interweaved rGO sheets together form the whole conductive networks to provide multichannel highways for charge transfer (lithium-ion diffusion and electron transport) during discharge–charge processes, promising excellent electrochemical performance of this structural anode material.
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高影响因子
RSC Advances
·
2018
·Vol. 8
·期 53
·30530-30538
·
IF 2.936
Wei Han,Wenjuan Wang,Yongchang Dong,Mei Li,Xiaoguang Yang,Milin Zhang
The electrode reaction of Pb(II) and co-reduction of Li(I) and Pb(II) were investigated on a tungsten electrode in LiCl–KCl eutectic melts by a range of electrochemical techniques. From cyclic voltammetry and square wave voltammetry measurements, the reduction of Pb(II) was found to be a one-step diffusion-controlled reversible process with the exchange of 2 electrons. The diffusion coefficients of Pb(II) were computed, and they obey the Arrhenius law. Using the linear polarization technique, the kinetic parameters, such as exchange current intensity (j0), standard rate constant (k0) and charge transfer resistance (Rct) for the Pb(II)/Pb(0) couple on a tungsten electrode were studied at different temperatures, and the activation energy is 27.32 kJ mol−1, smaller than the one for diffusion of Pb(II), which further confirmed that the reduction of Pb(II) was controlled by diffusion. A depolarisation effect for Li(I) reduction was observed from the results of cyclic voltammetry, square wave voltammetry and chronopotentiometry due to the formation of Li–Pb alloys by co-reduction of Li(I) and Pb(II). Furthermore, five Li–Pb intermetallic compounds, LiPb, Li8Pb3, Li3Pb, Li10Pb3 and Li17Pb4 characterized by scanning electronic microscopy and X-ray diffraction, were selectively prepared by potentiostatic electrolysis on a tungsten electrode and galvanostatic electrolysis on a liquid Pb electrode, respectively.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 40
·20244-20253
·
IF 7.443
Gui-lin Zhuang,Jia-qi Bai,Xin-yong Tao,Jian-min Luo,Xin-de Wang,Yi-fen Gao,Xing Zhong,Xiao-nian Li,Jian-guo Wang
S,N-co-doped porous carbon (SNPC) materials are good candidates for the cathodic oxygen-reduction reaction (ORR) and lithium-ion batteries (LIBs). However, SNPC gives low yield and is expensive. Herein, we report a new and efficient method for synthesizing a S,N-co-doped mesoporous carbon material through the carbonization of S,N-containing precursors in molten ZnCl2, where ZnCl2 served as the ionic solvent and Lewis acid catalyst. The resultant SNPC-800 showed a mesoporous structure with a specific surface area of 1235 m2 g−1 and a mesopore-size range of 10–45 nm, which were considerably larger than those obtained through the carbonization of ionic liquids and fabrication of graphene oxides. Furthermore, ORR measurements indicated good catalytic activity, comparable to the commercial Pt/C catalyst. Also the SNPC-800 material exhibited excellent catalytic stability, and high methanol tolerance compared to the commercial Pt/C catalyst. Density functional theory calculation results revealed that the catalytic properties originated from the synergistic effect of the S/N dopant and that the main catalytic reaction path followed an associative mechanism. LIB tests further showed high reversible capacity, as well as excellent cycling stability and rate performance.
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高影响因子
OPTICAL MATERIALS
·
2014
·
IF 2.075
Quntao Tang,Honglie Shen,Jing Jiao,Weilong Chen
ZnO:Er, Li light conversion film has been successfully fabricated by sol–gel method. XRD measurement demonstrated the successful incorporation of Er 3+ and Li + into ZnO films. The as-grown film co-doped with 2% Er 3+ and 3% Li + is featured with a transmittance of about 86.8% in the range of 400–900 nm. Moreover, the film exhibits a visible light emission either being excited by 355 nm or 980 nm. Due to its relatively high transmittance characteristics and promising properties of converting both UV and NIR light to visible light, the developed film is considered to have a potential application in novel light conversion devices including solar cells.
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高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Jian Lu,Yingying Qin,Qi Zhang,Yilin Wu,Jiuyun Cui,Chunxiang Li,Liang Wang,Yongsheng Yan
High-selective multilayered Li + -imprinted membranes (Li-IIMs) with enhanced hydrophilicity and stability were developed based on polyether sulfone substrate membranes. The multilayered structure was prepared with polydopamine (pDA) as the interfacial adhesion layer, SiO 2 nanoparticles as the hydrophilic layer and Li + -imprinted polymers as the imprinted layer. The selective “Li + -recognition sites” were formed using 12-crown-4 (12C4) as the adsorbing units. The optimal relative selectivity coefficients (α) of Li + /Na + and Li + /K + reached up to 1.85 and 2.07 with the imprinting factor ( β ) of 2.51, and the high permselectivity factors ( γ ) of Na + /Li + (7.39) and K + /Li + (9.86) were achieved on Li-IIMs. The Langmuir isotherm model and the pseudo-second-order kinetics model best fitted the rebinding data of Li-IIMs, as well as the rebinding capacities reached up to 90.3% of initial binding after 5 cycles of adsorption/desorption and just declined to 88.1% after another 5 cycles a month later. Therefore, the as-prepared Li-IIMs would have potential applications for the separation of lithium ions from salt lake brines.
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高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Hong-Hong Fan,Huan-Huan Li,Ke-Cheng Huang,Chao-Ying Fan,Xiao-Ying Zhang,Xing-Long Wu,Jing-Ping Zhang
Marcasite (m-FeS2) exhibits higher electronic conductivity than that of pyrite (p-FeS2) because of its lower semiconducting gap (0.4 vs 0.7 eV). Meanwhile, as demonstrates stronger Fe–S bonds and less S–S interactions, the m-FeS2 seems to be a better choice for electrode materials compared to p-FeS2. However, the m-FeS2 has been seldom studied due to its sophisticated synthetic methods until now. Herein, a hierarchical m-FeS2 and carbon nanofibers composite (m-FeS2/CNFs) with grape-cluster structure was designed and successfully prepared by a straightforward hydrothermal method. When evaluated as an electrode material for lithium ion batteries, the m-FeS2/CNFs exhibited superior lithium storage properties with a high reversible capacity of 1399.5 mAh g–1 after 100 cycles at 100 mA g–1 and good rate capability of 782.2 mAh g–1 up to 10 A g–1. The Li-storage mechanism for the lithiation/delithiation processes of m-FeS2/CNFs was systematically investigated by ex situ powder X-ray diffraction patterns and scanning electron microscopy. Interestingly, the hierarchical m-FeS2 microspheres assembled by small FeS2 nanoparticles in the m-FeS2/CNFs composite converted into a mimosa with leaves open shape during Li+ insertion process and vice versa. Accordingly, a “CNFs accelerated decrystallization–recrystallization” mechanism was proposed to explain such morphology variations and the decent electrochemical performance of m-FeS2/CNFs.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Zhen Liu,Huajun Zhou,Simon S. Ang,Jian-Jun Zhang
Here we report the evaluation of natrochalcite (Na[Cu 2 (OH)(H 2 O)(SO 4 ) 2 ]), an anionic layered structure [Cu 2 (OH)(H 2 O)(SO 4 ) 2 ] − charge-balanced by Na + , as an anode material for both Li- and Na-ion batteries. It delivers 224 mAh/g and 175 mAh/g in the first discharge in the Li + - and Na + -cells respectively, and decomposes to form amorphous matrixes during this step. In the subsequent charge, the original layered structure is unusually partially recrystallized back from the matrixes, resulting in 53 mAh/g and 35 mAh/g discharge capacities in the second discharge respectively. In subsequent cycling, Li + in the electrolyte is found to replace the original Na + during cycling in the Li + -cell and the electrode in the Li + -cell demonstrates better capacity retention rates than that in the Na + -cell, possibly due to Li + being smaller than Na + and thus decomposition-recrystallization cycles being more reversible during cycling in the Li + -cell.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 63
·58529-58540
·
IF 3.289
S. Zhu,M. Chen,J. Sun,J. Liu,T. Wu,H. Su,S. Qu,Y. Xie,S. Wang,X. Su,G. Diao
In this paper, ferroferric oxide (Fe3O4) nanoparticles/porous carbon nanofiber (Fe3O4/PCNFs) composites were successfully fabricated by electrospinning and subsequent calcination. The composites were characterized by X-ray diffraction, thermogravimetric analysis, scanning electron microscopy and transmission electron microscopy to analyze the structure, composition and morphology. The electrochemical performance was evaluated by coin-type cells vs. metallic lithium. The results indicated that Fe3O4/PCNFs composites exhibited high reversible capacity and good capacity retention. The discharge capacity was maintained at 717.2 mA h g−1 at 0.5 A g−1 after 100 cycles. The excellent performances of Fe3O4/PCNFs composites are attributed to good crystallinity and uniformly dispersive Fe3O4 nanoparticles, and a porous carbon shell with high conductivity. The carbon coating buffered the tremendous volumetric changes between Fe3O4 nanoparticles and Fe atoms in the charge/discharge processes and kept the structure integrity of Fe3O4 nanoparticles. Porous carbon nanofibers prepared by the unique calcination process improved the conductivity of composites and provided free space for migration of lithium ions. The preparation strategy is expected to be applicable to the preparation of other transition metal oxide materials as superior anode materials for lithium-ion batteries.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Yingchao Li,Canzhao Tu,Qianshun Chen,Yingying Lin,Baoming Li,Haixia Lyu
The overexpression of microRNA-222 (miRNA-222) is closely related to many human diseases, so the development of biosensors to detect this biomarker will contribute to the diagnosis of related diseases. Here, a simple, sensitive and specific fluorescence assay for the detection of miRNA-222 was developed using red-emitting upconversion nanoparticle (UCNP) as the donor and a DNA hairpin with black hole quencher-2 (BHQ-2) as the acceptor. Li + and Tm 3+ -doped UCNP with a strong emission peak at 654 nm was obtained by changing the doped ion ratio and constructing core-shell structures. Under optimal conditions, the linear range for detecting miRNA-222 is 0.5–2.5 nM and the limit of detection is as low as 0.077 nM without any complicated amplification strategy. Finally, the proposed assay was applied for the detection of miRNA-222 in serum samples. The results obtained were similar to those of the standard method, and the spiked recoveries were in the range of 97.62%–102.14 %, suggesting that the proposed method has practical value in a complex biological sample matrix.
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高影响因子
GREEN CHEMISTRY
·
2024
·
IF 9.3
Liequan Liu,Zikang Gong,Chen Liu,Aiping Peng,Ze Zhang,Ji Yu,Jianxin Cai,Zhenyu Yang
Due to the inherent limitations of commercial liquid electrolytes, such as flammability, volatility, leakage, and their inability to effectively inhibit the growth of lithium dendrites, the lithium battery research community has shifted its attention towards advancing solid-state electrolytes. Notably, polyethylene oxide (PEO) has emerged as a respected solid-state electrolyte, but its ionic conductivity still exhibits a relatively modest level. In this study, we fabricated the Li-IL@Fe-BDC composite by integrating lithium salt-loaded ionic liquids (Li-ILs) into cost-effective and environmentally friendly Fe-based MOF frameworks (Fe-BDC). The resulting composite filler was then incorporated into a PEO matrix, yielding flexible composite polymer electrolytes (CPEs) with a “brick and mortar” hybrid structure. This unique arrangement enhances the mechanical strength of CPEs, providing dispersed sites and multi-ion transport channels. Consequently, it achieves a high conductivity of approximately 4.9 × 10−4 S cm−1, an extended electrochemical window of about 4.8 V, and a notable Li+ transference number of ∼0.6. Moreover, the composite demonstrates excellent interfacial compatibility with the Li metal and remarkable resistance against dendrite growth during plating/stripping cycles, sustaining over 800 hours at a current density of 0.2 mA cm−2. Furthermore, LiFePO4/CPEs/Li cells exhibit outstanding capacity retention, reaching as high as 95.8% after 700 cycles at 1 C. These exceptional electrochemical performances can be attributed to the distinctive characteristics of the Li-IL@Fe-BDC composite filler, which provides multiple pathways for lithium ion migration and enhances interfacial stability. Consequently, this study unveils a promising approach for achieving high Li-ion conductivity and interfacial stability in CPEs, offering valuable insights for future breakthroughs in this burgeoning field with a focus on green chemistry principles.
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高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 19
·2400250
·
IF 8
Wenyu Tang,Yuanjing Wang,Yayun Zhou,Chuang Zhang,Zhen Chen,Fanquan He,Enhai Song,Qinyuan Zhang
Mn 4+ -activated red-light fluorides are widely used in high-quality displays, due to the narrow-spectral emission. However, achieving exceptional chromaticity coordinates and appropriate quantum efficiency (QE) at the same time is a great challenge. Herein, a Li substitution strategy is proposed for enhancing QE and improving the thermal stability of red-light Mn 4+ -activated Cs 2 NaGaF 6 (CNGF). The external quantum efficiency (EQE) of optimal Cs 2 NaGaF 6 : Mn 4+ , Li + (CNGF: Mn 4+ , Li + ) is improved from 15.79% to 33.61% and thermal stability increases from 68.4% to 85.5% (intensity at 150 °C relative to room temperature). EQE enhancement mechanism on the strategy is explored that Li substitution increases the local structural distortion of Mn 4+ for relieving the parity forbidden, and promotes Mn 4+ doping in the host lattice, which provides new insights for improving the QE of Mn 4+ non-equivalent doped fluorides. Moreover, with exceptional chromaticity coordinates of (0.7029, 0.2970), optimal sample CNGF: 4.8 mol% Mn 4+ ,0.9 mol% Li + can be used to fabricate white light-emitting diode (w-LED) backlight, which obtains wide color gamut of 110.68% National Television Standards Committee (NTSC) and high luminous efficacy of 110.57 lm W −1 , indicating that CNGF: Mn 4+ , Li + is a promising candidate for the next generation of wide gamut and efficient displays.
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高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Mingzhu Ni,Qiuying Xia,Jiaxin Liu,Xiaohui Zhu,Hui Xia
Spinel LiMn2O4 cathode possesses open three-dimensional ion transport channels, high safety, and abundant resources, making it a promising candidate for high-power lithium-ion batteries. However, spinel LiMn2O4 inevitably faces serious challenges of manganese dissolution and irreversible phase transitions during the electrochemical process, leading to rapid capacity decay and limiting its rate performance. Herein, we report a simple two-step solid-state sintering method to realize Li+ and PO43– codoping synergy in spinel LiMn2O4. It is found that PO43– doping not only expands the lattice parameters of the material, enhancing its charge-transfer kinetics but also increases the relative content of active Mn3+, improving the specific capacity of spinel LiMn2O4. Meanwhile, Li+ doping effectively enhances the stability of the spinel structure, and the irreversible phase transition from cubic phase to tetragonal phase could be effectively suppressed in spinel LiMn2O4. Consequently, benefiting from the synergistic effect of Li+ and PO43– codoping, the optimally codoped spinel LiMn2O4 electrode delivers high specific discharge capacities of 116 and 102 mA h g–1 at 1 and 20C, respectively, and achieves 78.1% capacity retention after 1000 cycles at 5C. This strategy provides an effective modification approach to developing advanced electrode materials for lithium-ion batteries.
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