NANOTECHNOLOGY
·
2020
·Vol. 32
·期 8
·085403
·
IF 3.551
Chaoye Zhu,Yao Zhang,Zhihong Ma,Hui Wang,Gunnar L Sly
Silicon is a promising anode for new-generation lithium ion batteries due to high theoretical lithium storage capacity (4200 mAh g−1). However, the low conductivity and large volumetric expansion hamper the commercialization of the silicon anode. In this case, we present a yolk-void-shell Si–C anode (denoted as Si@Void@C), which is synthesized through nano-Si oxidation, surface carbonization and etching of SiOx. The void can be fabricated only by the self-generation and etching of SiOx layer on the Si surface, without the help of template materials. Moreover, the void size can be adjusted only by means of the annealing temperature, which can be easily and precisely operated. The Si@Void@C/rGO with void size of 5 nm offers a discharge capacity of 1294 mAh g−1 after 100 cycles at a current density of 500 mA g−1. These enhanced performances can be ascribed to an appropriate size (5 nm) of void space which sufficiently accommodates the silicon volume expansion and stabilizes the carbon shell. At the same time, the voids effectively inhibit the growth of the solid electrolyte interface layer by depressing the decomposition of the electrolyte on the surface of Si in Si@Void@C/rGO. Furthermore, interfaces between Si@Void@C particles and rGO sheets construct bridges for electrons' conduction. In general, the present work provides a viable strategy for synthesizing silicon–carbon anode materials with long life.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 2
·305-316
·
IF 2.232
Wang Hao-yang,Cheng Xue,Li Xiao-feng,Pan Ji-min,Hu Jun-hua
To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials (LiNi 0.8 Co 0.15 Al 0.05 O 2 , NCA), lithium lanthanum titanate (LLTO) nanofiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride in a cathode. The enhancement of the conductivity was indicated by the suppressed impedance and polarization. At 1 and 5 C, the cathodes with coupling conductive paths had a more stable cycling performance. The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C. In the pristine cathode, the propagation of lattice damaged regions, which consist of high-density edge-dislocation walls, destroyed the bulk integrity of NCA. In addition, the formation of a rock-salt phase on the surface of NCA caused a capacity loss. In contrast, in the LLTO@C modified cathode, although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred, they were limited to a scale of several atoms, which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity retention. Only NiO phase “pitting” occurred. A mechanism based on the synergistic transport of Li ions and electrons was proposed.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jiawei Ge,Quntao Tang,Honglie Shen,Fei Zhou,Haobing Zhou,Wangyang Yang,Juan Hong,Binbin Xu,Jaffer Saddique
Silicon suboxide (SiO X ) is a promising anode material for lithium ion battery (LIB). However, oxygen-dependent SiO X poses a great impact on its cycling stability, which is difficult to controllably prepare. Additionally, the aggregation of nano-scale SiO X restricts the diffusion of lithium ion and structural stability during cycles. Herein, we realize the controllable preparation of porous SiO X /C sheets with various oxygen content and graphite-like carbon as anode materials of LIB . It is found that high oxygen content and a 3-dimensional network in SiO X /C can ensure high structural stability during cycles. As-prepared SiO X facilitates the growth of graphite-like carbon with high defect density, improving their electron and ion conductivity. As-prepared SiO X @C sheets deliver superior reversible capacity, cycling stability and rate performance (the second discharging capacity of 717.4 mAh g −1 at 100 mA g −1 with high initial Coulombic Efficiency of 64.08% is obtained; its capacity retention is as high as 100.44% against the second discharging capacity after 200 cycles; at a high current density of 2000 mA g −1 , its reversible capacity still remains 389 mAh g −1 ). This work provides a novel and simple approach to controllably prepare disproportionated SiO X @C sheets with the 3-dimensional network as ultrastable SiO x -based anode materials of LIB for practical application.
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高影响因子
DYES AND PIGMENTS
·
2017
·
IF 3.473
Jing Lu,Yong Wang,Jianfeng Huang,Jie Fei,Liyun Cao,Cuiyan Li
Mesoporous C-doped TiO 2 single crystals with oxygen vacancy (V O -MC TiO 2 ) have been prepared through a facile in-situ modified sol-gel synthesis. The oxygen vacancy of C-doped TiO 2 is controlled by the limited-oxygen atmosphere originates from the decomposition of urea. The as-prepared V O -MC TiO 2 shows a well-defined cubic morphology with average grain size of 22 nm. The N 2 adsorption-desorption isotherms further informs the presence of fissure form mesoporous structure. The V O -MC TiO 2 catalyzes the degradation of Rhodamine B with 97.3% removal efficiency in 9 min under UV light. And it can degrade the RhB completely under natural sunlight irradiation within 60 min. The excellent photocatalytic performance is attributed to the unique microstructure of V O -MC TiO 2 . C-doping together with oxygen vacancy in TiO 2 lattice leads to high separation efficiency of photogenerated charges. Moreover, the mesoporous surface enhances the visible light absorption and dye adsorption, resulting in the high visible light activity.
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高影响因子
JOM
·
2022
·Vol. 75
·期 6
·1982-1992
·
IF 2.597
Qiu Yuchao,Shi Junjie,Hou Changle,Dong Jingjing,Zhai Yumo,Li Kaixuan,Yan Sen,Yu Kai,Li Jianzhong,Liu Changsheng
The spinel and pseudobrookite type ceramic materials have been widely used in different industries including ceramics, refractory and metallurgy. Therefore, their physicochemical properties are important for the development of related processes. In this regard, it is important to understand the formation principles of the spinel and pseudobrookite solid solutions. In the present work, the equilibrium phase relations for the MgO-Al 2 O 3 -TiO 2 system at 1700°C in air were experimentally determined by high-temperature equilibration-quenching technique followed by XRD and SEM–EDS analyses. The pseudobrookite solid solution was found to be coexisting with spinel solid solution and rutile phase, respectively. The composition evolution and formation principles of the pseudobrookite and spinel solid solutions were further elucidated from the corresponding crystal structures and composition relations. Furthermore, great discrepancies were observed when the 1700°C isotherm from the present work was compared with the isotherm simulated by FactSage 8.1. The evolution of the solid solution existing area was intuitively presented with reference to the experimental data from the literature. The results from present work are important for the development of spinel and pseudobrookite solid solution ceramics as well as the optimization of the thermodynamic database for oxide systems.
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高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Jingwen Li,Yifei Li,Xingwei Zhai,Ya Cao,Jing Zhao,Yuguo Tang,Kun Han
In the paper, a DNA assisted magnetic reduced graphene oxide-copper nanocomposite (mrGO-CuNCs) is proposed. Copper ions are able to accelerate the oxidation of o-phenylenediamine. The electrochemical signal of the oxidized product, 2,3-diaminobenazine, are employed to characterize the HCV DNAs. The strategy is able to sensitively detect HCV DNA over a wide linear range within the range of 0.5–10 nM and has a detection limit of 405.0 pM. Critically, it could effectively discriminate the 1b and 6 k subtypes of HCV. This assay strategy has promising applications in the early diagnosis and blood screening of HCV.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 7
·2855-2862
·
IF 4.569
Sheng-You Qiu,Chuang Wang,Liang-Liang Gu,Ke-Xin Wang,Xiao-Tian Gao,Jian Gao,Zaixing Jiang,Jian Gu,Xiao-Dong Zhu
In cases involving high levels of sulfur loading or high levels of current discharge, constructing sulfur composite cathodes via traditional coating preparation processes is an unsuitable way to overcome intractable problems relating to cathodes for use in lithium–sulfur batteries, such as poor conductivity, severe volume expansion, and the detrimental shuttle effect. Herein, a novel three-dimensional self-supported TiO2@C membrane with hierarchical interlinked porosity and oxygen vacancies was prepared via a phase-inversion method to act as a sulfur host. The procured TiO2−x@C membrane facilitates the infiltration of electrolyte, provides fast lithium-ion and electron transport channels and abundant sulfur loading sites, and shows superb structural buffering against the large volume changes during the conversion process between sulfur and lithium sulfide. More importantly, the introduction of oxygen vacancies not only enhances the conductivity of the original TiO2, but it also improves the corresponding adsorption abilities toward polysulfides and the subsequent transformation dynamics. Therefore, the TiO2−x@C membrane can significantly inhibit the polysulfide shuttle effect through polar chemisorption and conversion catalysis. Based on the above superiorities, the TiO2−x@C/S membrane electrode exhibits an impressive lifespan of more than 500 cycles at 2 C with a prominent ultimate specific discharge capacity of 715.2 mA h g−1.
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高影响因子
Jove-Journal of Visualized Experiments
·
2024
·
IF 1.2
Miao Cui,Lijuan Jiang,Wei Yang,Wenfeng Zhang
The lethality of liver cancer and the resistance to chemical drugs have forced the search for effective prescriptions of traditional herbs for liver cancer. Animal models that are repeatable, easy to manipulate, and highly mimic the pathophysiological processes of liver cancer are the prerequisite for the successful screening of effective drug candidates. Meanwhile, reliable drug efficacy evaluation indicators and means are also the guarantee of anti-liver cancer drug research and development.Sanleng Jiashen formula, a representative prescription of traditional Chinese medicine containing Sparganium stoloni erum, Buch. -Ham. (Sanleng), Panax ginseng C. A. Mey. (ginseng), Rheum officinale Baill. (rhubarb), and Ligusticum chuanxiong Hort. (Chuanxiong), is prescribed to nourish the liver and clear heat, remove toxins, and promote blood circulation to treat liver cancer. This experimental protocol describes the preparation of lyophilized Sanleng Jiashen formula and the establishment process of in-situ liver cancer in BALB/c-nu mice. Histopathological staining, immunohistochemical detection of cancer markers, in vivo imaging of mice, and chick embryo chorioallantoic membrane test were used to explore the inhibition and anti-angiogenesis effect of Sanleng Jiashen formula on malignant proliferation of liver cancer tissue. The data show that the Sanleng Jiashen formula can effectively resist the malignant proliferation of liver cancer tissue, which is manifested by reduced tumor mass volume, improved pathological damage, and lower levels of the cancer marker ki67.The superior inhibition of angiogenesis also suggests that the Sanleng Jiashen formula may have the potential to treat and prevent the progression and deterioration of liver cancer. The whole experimental scheme shows a comprehensive process of traditional Chinese medicine components in the treatment of mouse liver cancer, which provides a reference for the establishment and optimization of a liver cancer model, as well as the research and development of drugs to prevent and treat liver cancer.
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PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Chang Liu,Shang Li,Yijing Xing,Huan Kang,Jinting Tan,Wei Guo,Mu Pan
Polyaniline (PANI) nanofibers were synthesized on carbon paper by electrochemical method, then heat-treated at temperatures of 800°C, 900°C, 1000°C and 1100°C to obtain a gas diffusion electrode (GDE). Fourier Transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the catalysts. The metal-free C-N catalyst with a reticular structure was coated on carbon paper. The ORR (oxygen reduction reaction) activity of metal-free C-N catalysts was evaluated by cyclic voltammetry (CV) and rotating disk electrode (RDE) in HClO 4 . The results showed that the catalysts heat-treated at 1000°C had the best ORR activity and better stability compared with the commercial Pt-based catalysts in acidic medium. The result of XPS showed that the activity of metal-free C-N catalysts was related to the pyridinic-type nitrogen. Finally, the advantages and disadvantages of these catalysts were discussed for further investigation.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Xiangyang Zhuang,Yao Zhang,Lingxiao He,Yunfeng Zhu,Qifeng Tian,Xinli Guo,Jian Chen,Liquan Li,Quan Wang,Guanzhou Song,Xiaoxiao Yan
In the present work, the sample of Si nanoparticles embedded in porous C (denoted as Si@porous-C) has been successfully synthesized by using nano-MgO as the pore-former. Observations by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) on Si@porous-C sample reveal that Si nanoparticles homogeneously disperse in porous carbon scaffold. As anode of lithium ion battery (LIB), Si@porous-C preserves a charge-discharge capacity of 1172 mAh g −1 after 40 cycles, possessing enhanced cyclic deterioration of only 0.35% per cycle in comparison with Si nanoparticles and Si nanoparticles embedded in ordinary carbon (denoted as Si@C). It delivers reversible capacities of about 947 mAh g −1 , 670 mAh g −1 , and 394 mAh g −1 in current densities of 1000 mA g −1 , 2000 mA g −1 , and 4000 mA g −1 , respectively, all of which are higher than those of commercial nano-silicon and Si@C. The improved high-rate capability of Si@porous-C could be attributed to a decreased resistance and enhanced infiltration of electrolytic solution around nano-silicon particles. The merits of scalable synthetic process and improved electrochemical properties recommend Si@porous-C as a promising anode material for high performance Li-ion batteries.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2016
·Vol. 22
·期 29
·9909-9913
·
IF 5.771
Wenhai Wang,Jing Geng,Long Kuai,Min Li,Baoyou Geng
Graphical Low cost, high value : An Mn 2 O 3 catalyst with porous structure exhibits comparably activity to commercial Pt/C and notably higher activity than other Mn-based oxides, such as Mn 3 O 4 and MnO 2 . In light of the low cost and high earth abundance of Mn, the highly active Mn 2 O 3 is a promising candidate to be used as a cathode material in metal–air batteries and alkaline fuel cells. Preparing nonprecious metal catalysts with high activity in the oxygen reduction reaction (ORR) can promote the development of energy conversion devices. Support-free porous Mn 2 O 3 was synthesized by a facile aerosol-spray-assisted approach (ASAA) and subsequent thermal treatment, and exhibited ORR activity that is comparable to commercial Pt/C The catalyst also exhibits notably higher activity than other Mn-based oxides, such as Mn 3 O 4 and MnO 2 . The rotating ring disk electrode (RRDE) study indicates a typical 4-electron ORR pathway on Mn 2 O 3 . Furthermore, the porous Mn 2 O 3 demonstrates considerable stability and a good methanol tolerance in alkaline media. In light of the low cost and high earth abundance of Mn, the highly active Mn 2 O 3 is a promising candidate to be used as a cathode material in metal–air batteries and alkaline fuel cells.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jiabao Zhu,Linghong Lu,Lili Shi,Zhongyang Dai,Wei Zhuang,Zhengsong Weng
The hydrophilicity/hydrophobicity of heterogeneous interface of the electrode material is critical for the performance of ionic liquids supercapacitors . However, the behavior of electrolytes at the electrode interface, especially the interface microstructure and properties is not yet clear. We investigated the electric double-layer of [emim][DCA] on slit pore of TiO 2 /C composite with the heterogeneous surface by combining molecular dynamics simulation and experimental measurements. The results of simulation show that coverage ratio of carbon on the surface affect the number density distribution, orientation and diffusion coefficient of [emim][DCA]. Moreover, we calculated the charge distribution of electric double-layer of [emim][DCA] and the capacitance. The results indicate that the capacitance of slit pore with the surface of TiO 2 with 78.7% carbon coverage ratio has the highest capacitance at high surface charge density. We performed an electrochemical experiment using composite of TiO 2 covered with carbon as the electrode material, and obtained the capacitance from cyclic voltammetry (CV). The experimental results also indicate there is an optimal coverage ratio of carbon, which achieves the highest capacitance. Our researches could provide a microscopic perspective of the electric double layer at the heterogeneous interface and the guidance for the design of electrode material.
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高影响因子
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