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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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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Physica Status Solidi-Rapid Research Letters
·
2020
·Vol. 15
·期 4
·2000563
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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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Materials
·
2020
·Vol. 13
·期 23
·5356
·
IF 3.057
Weihua Chen,Jiancheng Tang,Xinghao Lin,Yunlong Ai,Nan Ye
In the present study, high-purity ternary-phase nitride (Ti2AlN) powders were synthesized through microwave sintering using TiH2, Al, and TiN powders as raw materials. X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were adopted to characterize the as-prepared powders. It was found that the Ti2AlN powder prepared by the microwave sintering of the 1TiH2/1.15Al/1TiN mixture at 1250 °C for 30 min manifested great purity (96.68%) with uniform grain size distribution. The formation mechanism of Ti2AlN occurred in four stages. The solid-phase reaction of Ti/Al and Ti/TiN took place below the melting point of aluminum and formed Ti2Al and TiN0.5phases, which were the main intermediates in Ti2AlN formation. Therefore, the present work puts forward a favorable method for the preparation of high-purity Ti2AlN powders.Keywords:MAX-phase Ti2AlN;microwave;synthesis;high-purity powder
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Dong Li,Yuexiao Pan,Xunan Wei,Jun Lin
Red phosphors based on Mn 4+ doped fluorides emitting narrow red light under the excitation of blue GaN chips, which can help to improve the luminescence efficiency and color rendering index (CRI) of white light-emitting diodes (WLEDs). In this paper, we carried out a room-temperature synthesis method to obtain a new phosphor of CsNaGe x Sn 1-x F 6 :Mn 4+ (CNGSFM) which contains double-central ions Ge 4+ and Sn 4+ . By controlling the different ratios of the central ions Ge 4+ /Sn 4+ , the contraction and expansion of the matrix lattice CNGSF can be freely changed, which provides a new direction for exploring the trimming method of the lattice effect on the luminescence performance of phosphors. Mn 4+ in CNGSFM shows weak stability and its luminescence quenches fastly in humid environments , so that we explored a facile strategy to improve its humidity resistance. Furthermore, the quenched luminescence of the CNGSFM can be restored through surface modification. Therefore, our results not only establish the tunable mechanism between luminescence performance and microstructure, but also provide a feasible strategy to improve the humidity resistance of Mn 4+ doped double-composite fluoride phosphors.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 1
·413-422
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IF 11.301
Xiaohuan Chang,Junjie Fu,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Zhi Zheng,Sixin Wu
The introduction of alkali metal (AM) post-deposition treatment (PDT) has led to the consecutive breakthrough of world record efficiencies for Cu(In,Ga)Se2 photovoltaics. However, for the derivative Cu2SnZn(S,Se)4 (CZTSSe) solar cells, the corresponding verdict seems partially unjustified due to the difference in defect chemical environment and phase structure, and the most effective incorporation means of AMs is still a mystery. In this work, for the first time, we developed a dual AM synergistic incorporation strategy combining light and heavy AMs by post-depositing CsF after NaF-PDT to improve the efficiency of CZTSSe solar cells. The relevant microscopic-electrical advantages with regard to the different roles of NaF and CsF PDT are discussed in more detail. It was found that the Na atoms are randomly dispersed both in the grain interior (GI) and grain boundaries (GBs), significantly increasing the acceptor concentration and passivating the deep level defects to enhance the Voc. In contrast, the Cs atoms are mainly segregated at the GBs, primarily increasing the potential of the GBs and improving the FF. The prominent electric benefits of Cs at the GBs and Na in the GI finally increase the device efficiency from 10.12% to 12.16%. Our findings solve the difficulty in obtaining the available Voc and FF for future high efficiency research and should serve as a basis for the in-depth understanding of AM-PDT in kesterite photovoltaics.
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COMPOSITES PART B-ENGINEERING
·
2020
·
IF 7.635
Lingxin He,Xia Zhou,Wei Cai,Yuling Xiao,Fukai Chu,Xiaowei Mu,Xianling Fu,Yuan Hu,Lei Song
Similar to graphene, few-layer black phosphorus possesses many excellent properties such as good thermal stability , mechanical properties and unique characteristic dimension effects, which is considered as promising nanoadditives . But the low yield and inferior interfacial adhesion with polymer matrix are unavoidable obstruction to fabricate high performance nanocomposites . Herein, we report a facile and environmentally friendly approach to simultaneously exfoliate and modify black phosphorus (BP) by electrochemical cathodic exfoliation, where BP crystal acted as the cathode and ethylene imine polymer (PEI) acted as electrolyte and modifier. The positively charged PEI would uniformly anchor on the surface of the newly peeled-off BP nanosheets through electrostatic attraction effect, resulting in preventing the agglomeration of BP nanosheets and improve the compatibility between BP and waterborne polyurethane (WPU) matrix. Significantly, with the addition of 2.0 wt% PEI modified BP in WPU matrix, the fire safety of WPU composites was enhanced. The peak heat-release rate, total heat release, total smoke production and total CO yield are decreased by 34.3%, 21.2%, 22.3% and 50.2% compared to pure WPU, respectively. Also, the tensile strength of WPU composites was increased by 71% (from 21.9 to 31.0 MPa) at the cost of the breaking elongation slightly decreased by 5.6%. This work provides the possibility for the scalable preparation and a real application of BP in polymer nanocomposites.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yuanyuan Li,Pengcheng Feng,Cong Wang,Wenjun Miao,He Huang
The severe issues facing conventional therapies for triple negative breast cancer (TNBC), such as poor response rate and side effects, calls for new strategies to realize better prognosis. Owing to the merits of good efficacy, safety and facile implementation, phototherapy represents an attractive modality for this goal. Black phosphorus (BP) is a class of novel interesting materials for biomedical uses with advantages of biodegradability and optical activity. However, its stability, safety and biological performance remained to be further optimized. In this work, we report a novel light-responsive nanosystem, named [email protected] , for fluorescence imaging-guided synergistic photothermal and photodynamic therapy (PTT/PDT) against TNBC. Hyaluronic acid was coated onto NIR dye(cypate)-loaded BPN, resulting in favorable stability, excellent delivery efficiency into tumor cells and photothermal and photodynamic potential. Importantly, the safety profile of HBPN was greatly improved, compared to the counterpart without HA coating. Following NIR irradiation, localized generation of singlet oxygen and hyperthermia by [email protected] had a significant antitumor effect against both 4T1 cell monolayers and 3D organoids in vitro . Additionally, [email protected] showed significantly enhanced accumulation in tumor tissue and subsequently promoted light-triggered tumor ablation in a mouse model of TNBC. Taken together, this study demonstrates that novel nanophototherapeutics with great stability and safety profile such as [email protected] represent a promising platform for imaging-guided phototherapy for breast cancer treatment.
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