APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Min Yang,Li Liu,Hanxiao Yan,Wen Zhang,Die Su,Jiaxing Wen,Wen Liu,Yiting Yuan,Junfang Liu,Xianyou Wang
The key to the development of wearable electronic equipment lies in the design of flexible batteries, in which the electrodes with outstanding mechanical behavior are quite important. Herein, porous nitrogen-doped Sn/C fibers (P-Sn/C-N Fs) film has been successfully synthesized via simple electrospinning and subsequent calcination process in which folic acid and polymethylmethacrylate (PMMA) play the role of introducing nitrogen and forming pores, respectively. The introduction of nitrogen improves the electronic conductivity of the material, and the presence of porous structure increases the specific surface area. More importantly, when the P-Sn/C-N Fs film is used directly as a free-standing electrode for lithium ion batteries, it exhibits outstanding electrochemical performance. The P-Sn/C-N Fs film exhibits a discharge capacity of 712.1 mAh g −1 at 500 mA g −1 after 500 cycles. Even at the high current density of 5 A g −1 , it displays a high discharge capacity of 429.1 mAh g −1 after 1000 cycles. These findings indicate that the P-Sn/C-N Fs film has the potential to be applied as free-standing anode materials for lithium ion batteries.
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JOURNAL OF POWER SOURCES
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2021
·
IF 9.127
Min Yang,Xiaojuan Huang,Liquan Yao,Limei Lin,Aicheng Chen,Yongqing Chen,Yuliang Che,Shuiyuan Chen,Xiangkai Kong,Guilin Chen
Molecular solution with the metal-thiourea complex is a facile and effective route for Cu 2 SnS 3 (CTS) thin film deposition . However, its stability is still challenging due to flexible metal salts precursors. Here we report a strategy to enhance the stability of the Cu–Sn–S molecular solution that use bivalent Sn to suppress the oxidation of the S 2- of thiourea via the redox reaction . The self-stabilizing mechanism has been carefully revealed by the systematic experiments and confirmed by the spontaneous reaction process of metal-thiourea system. It demonstrates that Sn with a low valence state weakens the transfer of lone pair electrons from thiourea to Cu 2+ and Sn 4+ ions, alleviating the sulfur precipitates from thiourea oxidation because of the easily reducible character of Sn 2+ ion. The solution with Sn 2+ antioxidant additive can be stored for a long time under air ambient, which is then spin-coated and sulfurized with Sn powder compensation. The uniform CTS thin film with composition control is finally achieved and delivers a device efficiency of 1.15%. This work provides a guide on stabilizing the solution precursor for chalcogenide thin film deposition.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 27
·8659-8665
·
IF 7.393
Ya-Nan Li,Zi-Xia Chen,Wen-Dong Yao,Ru-Ling Tang,Sheng-Ping Guo
Metal chalcogenides are charming candidates for nonlinear optical (NLO) materials due to their multiple functional structural units and large polarizability. Here, isostructural Sn-based chalcogenides BaZnSnQ4 (Q = S, Se) were successfully synthesized based on the idea of heterovalent cations co-substitution of the Ga site in the parent BaGa2Se4. They crystallize in an orthorhombic system with polar space group Fdd2. Their structures are built by the NLO functional motifs ZnQ4 and SnQ4 tetrahedra. BaZnSnS4 (1) and BaZnSnSe4 (2) exhibit good SHG effects (0.6 and 1.0 times than that of AgGaS2) and also show type-I phase-matchable behaviors. In addition, their laser-induced damage thresholds are about 9.8 and 5.7 times higher than that of AgGaS2, respectively. BaZnSnS4 possesses a larger bandgap (3.25 eV) among the quaternary chalcogenide AMIIMIVQ4 (A = Sr, Ba; MII = Zn, Cd, Hg; MIV = Si, Ge, Sn; Q = S, Se) system. On the basis of theoretical calculation result, the source of SHG responses can be assigned to the synergetic effect of large distorted tetrahedral units. The achievement of this work provides a route to obtain new infrared NLO materials.
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ULTRASONICS SONOCHEMISTRY
·
2021
·
IF 7.491
Youwen Tian,Wei Luo,Yedan Wang,Yun Yu,Wanzhen Huang,Haodong Tang,Yifan Zheng,Zongjian Liu
Although the traditional Stoˇber process-based methods are widely used for encapsulation of metal nanoparticles in SiO 2 , these time-consuming methods are not effective for coating metal microparticles with a uniform SiO 2 layer of desired thickness. Herein, an ultrasound-assisted, interface-confined sol–gel method is proposed for fast encapsulation of metal microparticles in SiO 2 , and the encapsulation of Sn microparticles is chosen as an example to illustrate its feasibility. The proposed method involves covering metal microparticles with liquid films that contain water, alcohol, surfactant (Span-80) and catalyst (NH 4 F) and then ultrasonically dispersing these particles into cyclohexane, where tetraethylorthosilicate (TEOS) is added. To ensure the hydrolysis-condensation reactions of TEOS occurring at the particle-cyclohexane interface so that the formed SiO 2 is coated on the particles, the microparticles should be well dispersed into cyclohexane with the liquid films being not broken away from their surfaces. It is found that the assistance of probe sonication and the addition of surfactant are crucial to achievement of a good dispersion of metal microparticles in cyclohexane. And using high-viscosity alcohol (namely glycerol), controlling the volume ratio of water to alcohol and the amount of water, and choosing a suitable ultrasonic power are essential for preventing the formation of free SiO 2 (namely SiO 2 that is not coated on the particles), which is a result that the liquid films escape from the particle surfaces under ultrasonic cavitation. Our results have also revealed that the thickness of SiO 2 layer can be adjusted by changing the reaction time or the total amount of water. In particular, the thickness of SiO 2 layer can be easily raised by simply repeating the encapsulation procedure. Compared with the traditional Stoˇber process-based methods, the proposed method is time-saving (reaction time: about 30 min vs. more than 12 h) and extremely effective for coating microparticles with a continuous, uniform SiO 2 layer of desired thickness.
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高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 11
·2004711
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IF 30.849
Yuxuan Liu,Renzong Hu,Dechao Zhang,Jiangwen Liu,Fang Liu,Jie Cui,Zuopeng Lin,Jinsong Wu,Min Zhu
To achieve high ionic conductivity for solid electrolyte, an artificial Li-rich interface layer of about 60 nm thick has been constructed in polymer-based poly(ethylene oxide)-lithium bis(trifluoromethanesulfonyl)imide composite solid electrolyte (briefly noted as PEO m ) by adding Li-based alloys. As revealed by high-resolution transmission electron microscopy and electron energy loss spectroscopy, an artificial interface layer of amorphous feature is created around the Li-based alloy particles with the gradient distribution of Li across it. Electrochemical analysis and theoretical modeling demonstrate that the interface layer provides fast ion transport path and plays a key role in achieving high and stable ionic conductivity for PEO m -Li 21 Si 5 composite solid electrolyte. The PEO m -5%Li 21 Si 5 composite electrolyte exhibits an ionic conductivity of 3.9 × 10 –5 S cm −1 at 30 ° C and 5.6 × 10 −4 S cm −1 at 45 ° C. The LiFePO 4 | PEO m -5%Li 21 Si 5 | Li all-solid-state batteries could maintain a stable capacity of 129.2 mA h g −1 at 0.2 C and 30 ° C after 100 cycles, and 111.3 mA h g −1 after 200 cycles at 0.5 C and 45 ° C, demonstrating excellent cycling stability and high-rate capability.
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高影响因子
Nano Research
·
2021
·Vol. 14
·期 12
·4795-4801
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IF 8.897
Hu Zheng,Yuan Tingbiao,Li Hui,Qiu Yishu,Zhou Wei,Zhang Jiangwei,Zhao Yuxin,Hu Shi
Two-dimensional (2D) oxide can be continuously produced by bubbling oxygen into liquid metals and the harvesting of these oxide relies on the proper choice of dispersion solvents. The mass-production of ligand-free 2D materials from high melting-point metals will not be possible if the limited stability of the traditional dispersion solvents is not circumvented. Herein, liquid tin was used for the first time in the bubbling protocol and 2D tin oxide was obtained in molten salts. The nanosheets were studied with combined microscopic and spectroscopic techniques, and high-density grain boundaries was identified between the sub-5-nm nano-crystallites in the nanosheets. It gives rise to the high performance in electrocatalytic CO 2 reduction reaction. Density-functional-theory based calculation was applied to achieve a deeper understanding of the relationship between the activity, selectivity, and the grain-boundary features. The molten-salt based protocol could be explored for the synthesis of a library of functional 2D oxides.
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ChemSusChem
·
2021
·Vol. 14
·期 11
·2383-2392
·
IF 8.928
Tianbiao Zeng,Gang Chen,Qimeng Peng,Dong Feng,Qian Wang
Graphical Three steps forward : A facile three-step strategy containing co-precipitation-reduction-phosphorylation is proposed to synthesize nano-Sn 2 S 3 particles embedded in the nitrogenous carbon matrix (Sn 2 S 3 /CN) for sodium-ion battery (SIB) anode materials. The as-synthesized Sn 2 S 3 /CN exhibits some of the best electrochemical performances among recently reported SnS and SnS 2 -based SIB anode materials, such as higher reversible capacity or better cyclability. Metallic tin (Sn) compounds are viewed as promising candidates for sodium-ion batteries (SIB) anode materials yet suffer from large volume expansion and limited electrode kinetics. Manufacturing rational structure is a crucial factor to achieve high-efficiency sodium storage for SIBs. In this study, nano Sn 2 S 3 embedded in nitrogenous-carbon compounds (nano-Sn 2 S 3 /C) was designed for SIB anode materials via a facile three-step strategy: precipitation, heat treatment and vulcanization with no templating agent. Density functional theory calculations suggested that Sn 2 S 3 displayed a low Na + diffusion energy barrier and the Sn−S bonds could be rebuilt during the sodiation/de-sodiation process. Notably, electrochemical measurements coupled with ex-situ X-ray diffraction and ex-situ transmission electron microscopy were proposed to reveal the underlying Na + storage mechanisms. Sn 2 S 3 acted as a high-capacity composition, while the porous nitrogenous-carbon matrix served as a rigid-conductive frame to accommodate the volume expansion and prevented the aggregation of nano Sn 2 S 3 . The rationally generated architectures benefited greatly in rate capacity and structural stability. As expected, the as-prepared nano Sn 2 S 3 /C exhibited remarkable rate capabilities with a specific capacity of 603 and 160 mAh g −1 under typical conditions at 0.2 and 4 A g −1 , respectively. This work may trigger new enthusiasm for engineering high-performance SIB anode materials.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Hang Ren,Qianqian Zhang,Zhao Meng,Rui Ling,Weidong Qin,Zhenglong Wu
Gold triangular nanoplates (AuTNPs) and gold nanorods (AuNRs) have been widely used in colorimetric sensing due to their shape-dependent localized surface plasmon resonance properties. Herein, we report new colorimetric detection strategies based on a low-cost RGB colorimetry system equipped with an industrial-grade color sensor and provide two demonstrations for the potential applications. The first is the online detection of cadmium ions (Cd2+) through the Cd2+-promoted etching of glutathione-stabilized AuTNPs that was initialized by H2O2 and iodide. For the first time, the etching time corresponding to the inflection point of the first derivative of the Red channel transmission curve was used for calibration. The method was finally applied in the detection of Cd2+ in fortified rice samples. In the second demonstration, the RGB values continuously acquired using the instrument were converted to HSV (hue, saturation, and value) space, which was successfully employed in pH detection via etching of AuNRs. Importantly, the overaged AuNRs with poor homogeneity could be discerned by the method at the beginning of analysis, which is helpful in achieving reliable measurements. Our results suggest that integration of the low-cost portable instrument and the new strategies has the promising potential for sensitive, accurate, precise, and good-linearity detection.
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FUSION ENGINEERING AND DESIGN
·
2021
·
IF 1.453
Maoqiao Xiang,Jie Zheng,Shaofu Li,Chaoquan Hu,Jingyi Cui,Yingchun Zhang,Qiang Qi,Fen Yue
Lithium-based ceramic tritium breeders would attack the blanket structural materials and produce brittle corrosion layers, causing potential safety hazard. Herein, coated breeders were proposed as advanced tritium breeders to address the issue. Carbon (C), titanium nitride (TiN) and titanium carbide (TiC) were investigated as inert protective shells because they show excellent stability and chemical compatibility with Li 2 TiO 3 and Li 4 SiO 4 . Moreover, for the first time, the C and TiN coated Li 2 TiO 3 and Li 4 SiO 4 pebbles were successfully fabricated by fluidized bed chemical vapor deposition (FBCVD) process, which would significantly decrease the brittle corrosion layers and increase the safety. The deposition behavior and interface reactions were systemically investigated.
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ChemNanoMat
·
2021
·Vol. 7
·期 3
·277-283
·
IF 3.154
Jie Wang,Hongqin Ma,Jia Li,Xinyue Luo,Luqi Yu
Graphical Cu(I) decorated 2D black phosphorus nanosheets were synthesized by a ball-milling method . In the process of ball-milling, the bulk black phosphorus was exfoliated into nanosheets under the action of shearing force. Due to the reducibility of black phosphorus, it can react with CuCl 2 to form Cu(I)/BNPSs-n. As the active component of the adsorbent, Cu(I) species can interact with benzothiophene or dibenzothiophene in fuel to achieve the purpose of adsorption desulfurization. In this study, Cu(І) decorated two-dimensional black phosphorus nanosheets (BPNSs) adsorbents were prepared by a ball-milling method, and their adsorption-desorption performances were tested by batch adsorption experiments. The results showed that Cu(ІI) can be completely reduced to Cu(І) without adding any additional reducing agents during the ball-milling process, owing to the ability of black phosphorus to provide electrons to Cu(ІI). Moreover, the produced Cu(І) species were firmly anchored on BPNSs surface through chemical bonds formed between Cu and P atoms, effectively preventing them from aggregating. As the active sites on BPNSs surface, Cu(I) species can adsorb dibenzothiophene or benzothiophene from fuel by forming π-complexation bonds with them. The maximum adsorption capacity of the adsorbent for dibenzothiophene and benzothiophene were 13.16 and 18.02 mg S/g, respectively. Besides, the adsorption desulfurization activity can be recovered well by adopting simple thermal treatment.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuechao Zhao,Xiangyun Zhao,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
Although the traditional Cu-poor architecture addresses many limitations for Cu2ZnSn(S,Se)4 solar cells, its further development still encounters a bottleneck in terms of efficiency, primarily arising from the inferior charge transport within the quasineutral region and enlarged recombination at back contact. On the contrary, the electrical benign kesterite compound with higher Cu content may compensate for these shortages, but it will degrade device performance more pronouncedly at front contact because of the Fermi level pinning and more electric shunts. Based on the electric disparities on their independent side, in this work, we propose a new status of Cu component by exploring a large grain/fine grain/large grain trilayer architecture with higher Cu content near back contact and lower Cu content near front contact. The benefits of this bottom Cu-higher strategy are that it imposes a concentration gradient to drive carrier diffusion toward front contact and decreases the valence band edge offset in the rear of the device to aid in hole extraction. Also, it maintains the Cu-poor architecture at the near surface to facilitate hole quasi-Fermi level splitting. In return, the local Cu component engineering-mediated electric advances contribute to the highest efficiency of 12.54% for kesterite solar cells using amine–thiol solution systems so far.
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高影响因子
Physica Status Solidi-Rapid Research Letters
·
2020
·Vol. 15
·期 4
·2000563
·
IF 2.291
Xinhua Li,Qingshuang Ma,Ji Dong,Tansir Ahamad,Zongqing Ma
The Nb 3 (Al 1− x Sn x ) superconductor with enhanced critical current density ( J c ) is prepared by the process of mechanical alloying (MA) and subsequent low-temperature sintering and the enhancement mechanism of J c in Nb 3 (Al 1− x Sn x ) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb 3 (Al 1− x Sn x ). The existence of dispersed Nb 2 Al nanoparticles (<30 nm) in Nb 3 (Al 1− x Sn x ) is confirmed by microstructure observation. These nanosized Nb 2 Al particles can serve as flux pinning centers, which leads to the increase of the flux pinning force as well as the enhancement of Nb 3 (Al 1− x Sn x )'s J c performance.
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