JOURNAL OF SOLID STATE CHEMISTRY
·
2018
·
IF 2.179
Linlin Xu,Dong Chen,Hui Liu,Jun Yang
Structural conversion using core-shell silver (Ag)-platinum (Pt) nanoparticles as starting materials is a promising way to produce nanocomposites consisting of silver sulfide (Ag 2 S) and hollow Pt nanostructures (Ag 2 S-hPtNCs). However, the mechanism behind the structural conversion process is yet to be understood. In this study, we use transmission electron microscope (TEM) as a typical tool to characterize the products formed in different structural conversion processes, and interpret the experimental observations by proposing mechanisms behind the reactions between core-shell Ag-Pt nanoparticles and sulfur precursors from different sources. We then design additional experiments to rationalize the formation mechanism we proposed. The mechanistic understanding of the structural conversion from bimetallic core-shell nanostructures to heterogeneous nanocomposites may extend the fabrication of heterogeneous nanocomposites for a given technological application.
研究领域:
纳米材料科学
·
无机化学
·
纳米医学
·
生物材料
·
转化医学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 11
·2781-2789
·
IF 2.162
Tingjun Zhong,Richard J. Mandle,John W. Goodby,Lanying Zhang,Cuihong Zhang
In this work, the thiol-ene click reaction is employed to fabricate polymer-dispersed liquid crystal (PDLC) films by photoinitiated polymerization. The PDLC films are prepared by systematic variation of key conditions: variety and content of -ene monomer, liquid crystal (LC) content, curing time, and curing light intensity. We find that both the morphologies and electro-optic properties of these films are adjustable. When increasing the length of alkyl main chain of -ene monomers, the driving voltages reduce, but in turn, the contrast ratio decreases. Increasing -ene monomer content raises the driving voltages as well as the response time, and the increase of LC content lowers the driving voltages but has a negative effect on the contrast ratio. The changes to the curing conditions (both curing time and UV light intensity) can be used to modify the driving voltages, response time, and contrast ratios of PDLC films. These comparative studies will elucidate new insights in commercial applications of intelligent PDLC films.
研究领域:
材料科学
·
高分子化学
·
软物质物理
·
光电功能材料
·
智能材料
✓ 已验证
DOI
高影响因子
Solar RRL
·
2019
·Vol. 3
·期 5
·1800346
·
IF 0
Jiang Cheng,Rong Hu,Kun Wang,Xiang Meng,Ying Li,Xin Yang,Xiaoqing Liao,Lu Li,Kok Boon Chong
Antimony chalcogenide is a promising absorber material for photovoltaic (PV) cells because of its tunable band gap, strong optical absorption, earth-abundant, and nontoxic constituents. Here, a novel hydrazine-free approach for fabricating antimony chalcogenide films prepared via spray pyrolysis deposition with further selenylation, as well as high performance solar cells are reported. The fabricated antimony chalcogenide solar cells exhibits remarkably high open-circuit voltage ( V OC ) comparing with that of Sb 2 Se 3 and Sb 2 S 3 devices. The distribution of Se during the selenylation process via refering to the Fick's second law is discussed. The results show that the selenized absorber has tremendously improved absorbance for visible light and a cascade-type energy level from surface to bulk, resulting in an ideal energy level matching for p-n junction. By introducing an efficient buffer layer, the detrimental short-circuit is avoided by reducing the cracks. Finally, 4.57% of the power conversion efficiency (PCE) of the solar cell is achieved. Furthermore, a module with a large-scale active area of 21 cm 2 is successfully fabricated, which shows a PCE of 3.19%, and a V OC of 3.42 V. The present work suggests that the antimony chalcogenide solar cells are promising for industrial application.
研究领域:
材料科学
·
光伏技术
·
半导体器件
·
能源材料
·
薄膜制备
·
表面工程
·
器件物理
✓ 已验证
DOI
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 5
·3350-3355
·
IF 3.201
Ailijiang Abudurusuli,Kui Wu,Shilie Pan
Four new quaternary chalcogenides A2Ba7Sn4Q16 (A = Li, Na; Q = S, Se) were successfully synthesized in vacuum-sealed silica tubes for the first time. All of them crystallize in the noncentrosymmetric (NCS) cubic I3d space group with the cell parameters ranging from 14.807 to 15.4163 Å and Z = 4, respectively. Interestingly, their isostructures are different from the structural transformations (from tetragonal to trigonal) appearing in previously reported Na2BaSnQ4 compounds. As observed in their structures, (Na/Ba)Q4 and SnQ4 units alternately connect with each other by sharing corners to build a three-dimensional (3D) framework structure with charge-balanced Ba cations located within tunnels, which is different from the observation that the Na atoms located inside the tunnels formed by the interconnection of the BaS8 and SnS4 units in Na2BaSnS4. Optical properties (diffuse-reflection, IR, and Raman spectra) were also systematically studied and the results indicate that their optical bandgaps are in the range from 1.75 to 2.5 eV. Moreover, the second harmonic generation (SHG) responses of the title compounds were also measured to be about 0.1–0.5 times higher than that of benchmark AgGaS2 under 2.09 μm radiation.
研究领域:
材料科学
·
无机化学
·
非线性光学
·
晶体学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hongliang Li,Tong Zhang,Zi Yang,Yueli Shi,Quanchao Zhuang,Yanhua Cui
The electrochemical impedance spectroscopy (EIS) technique has been widely used for analysing lithium battery systems, especially to determine kinetic and transport parameters, understand reaction mechanisms, and study capacity fade mechanisms. In this work, the initial charge-discharge process of LiCoO 2 @LiNbO 3 /Li 10 GeP 2 S 12 /Li (LLCO/LGPS/Li) and LiNi 0.5 Co 0.2 Mn 0.3 O 2 @LiNbO 3 /Li 10 GeP 2 S 12 /Li (LNCM523/LGPS/Li) batteries at different potentials was systematically investigated by EIS. During the lithium-ion insertion-removal process, the Nyquist plots of both LLCO/LGPS/Li and LNCM523/LGPS/Li batteries are composed of three parts, namely, two semicircles and an inclined line, which can be attributed to the interfacial impedance between the solid electrolyte and electrode, the charge transfer process, and the solid-state diffusion of the lithium-ion in the cathode with decreasing frequency, respectively. A proper equivalent circuit is proposed to fit the experimental EIS data and the variations in the interfacial resistance ( R if ) between the solid electrolytes (SEs) and electrode. The charge transfer resistance ( R ct ) along with the increase or decrease in the electrode polarization potential is quantitatively analysed in detail. Based on the experimental results, it has been revealed that, the increase in R if between the solid electrolyte and electrode may cause the capacity fade of all-solid-state batteries during charge-discharge.
研究领域:
电化学
·
材料科学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Weiqin Wang,Yuanying Yang,Yanna NuLi,Jingjing Zhou,Jun Yang,Jiulin Wang
We fabricate in-situ carbon-encapsulated cuprous sulfide (Cu 2 S@C) composite through a metal-organic framework (MOF)-derived sulfurization method and compare its electrochemical performance as a displacement reaction cathode of hybrid Mg 2+ /Li + batteries with 0.4 mol L −1 (PhMgCl) 2 -AlCl 3 +1.0 mol L −1 LiCl/THF nucleophilic hybrid electrolyte and 0.2 mol L −1 Mg(HMDS) 2 -(AlCl 3 ) 2 –MgCl 2 +1.0 mol L −1 LiTFSI/DME non-nucleophilic hybrid electrolyte. Benefiting from the intrinsic property of Cu 2 S, well-defined hybrid porous structure and carbon encapsulation derived from MOFs, the Cu 2 S@C composite exhibits 399.2 mA h g −1 discharge capacity and the capacity maintains at approximately 150 mA h g −1 at 0.05 C after 50 cycles in the nucleophilic hybrid electrolyte. The mechanism investigation verifies that the formed Cu 1.96 S in the first discharge process succeeds to transform into MgS and Li 2 S, which results in the reversible displacement reaction dominantly occurring between Cu 1.96 S and Cu during subsequent cycles. When using the non-nucleophilic hybrid electrolyte, an enhanced cycling stability can be achieved due to the mitigation of ionic sulfide dissolution. The present work demonstrates the feasibility of building the structural design of low-cost displacement reaction cathode with more compatible electrolyte, and provides the potential of establishing practical hybrid Mg 2+ /Li + batteries for energy storage.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Lei Li,Wei Chu,Cheng Ding,Xinguo Xi,Ruiyu Jiang,Jinlong Yan
s Mo-based nanoparticles (MoO 2 and Mo 2 C) embedded in porous carbon matrix have been synthesized by a successive hydrothermal and thermal treatment strategy. The synthesized materials were tested for CO x -free H 2 production via ammonia decomposition . Various characterizations, including N 2 -sorption, TGA , FTIR, TEM, XRD , EDX and XPS, were employed to investigate the morphology, component and structure of fresh and used catalysts. In terms of fresh Mo@C sample, tiny Mo-based nanoparticles (3–6 nm) are homogeneously dispersed in porous carbon matrixes, which were rapidly nitridized to MoN phases during reaction process. Most of MoN species were still embedded in carbon matrixes after 25 h stability test. For comparison, MoN@C sample was achieved via temperature-programmed ammonolysis of Mo@C sample, demonstrating the formation of MoN species and enhanced activities. The ammonia decomposition activity (∼90% conversion) is obtained over MoN@C catalyst at 600 °C and 15,000 h −1 , which is higher than that of non-pretreated Mo@C catalyst. This embedded structure also endows them with a relatively stable performance even at high temperature.
研究领域:
材料科学
·
催化化学
·
纳米技术
·
能源化学
·
氢能存储与利用
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lingyue Wang,Xiancheng Wang,Renming Zhan,Zhengxu Chen,Shuibin Tu,Chunhao Li,Xuerui Liu,Zhi Wei Seh,Yongming Sun
The structure and electrochemical performance of lithium (Li) metal degrade quickly owing to its hostless nature and high reactivity, hindering its practical application in rechargeable high energy density batteries. In order to enhance the electrochemical reversibility of metallic Li, we designed a Li/Li2S-poly(acrylonitrile) (LSPAN) composite foil via a facile mechanical kneading approach using metallic Li and sulfurized poly(acrylonitrile) as the raw materials. The uniformly dispersed Li2S-poly(acrylonitrile) (Li2S-PAN) in a metallic Li matrix buffered the volume change on cycling, and its high Li ion conductivity enabled fast Li ion diffusion behavior of the composite electrode. As expected, the LSPAN electrode showed reduced voltage polarization, enhanced rate capability, and prolonged cycle life compared with the pure Li electrode. It exhibited stable cycling for 600 h with a symmetric cell configuration at 1 mA cm–2 and 1 mA h cm–2, far outperforming the pure metallic Li counterpart (400 h). Also, the LiCoO2||LSPAN full cells with a cathode mass loading of ∼16 mg cm–2 worked stably for 100 cycles at 0.5 C with a high capacity retention of 96.5%, while the LiCoO2||Li full cells quickly failed within only 50 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chengyu Mo,Yutao Yang,Zhenyu Wang,Yanpeng Lv,Rongzheng Tian,Zixiang Zhao,Hongzhou Zhang,Chunliang Li,Lianqi Zhang,Yongan Yang,Dawei Song
Sulfide solid electrolytes have attracted wide attention due to their high ionic conductivity . Li 6 PS 5 Cl is one of the most promising electrolytes for all-solid-state lithium batteries with high-energy-density. It is reported that the disordered arrangement of Cl - in the aragonite structure has a significant effect on the conductivity of Li 6 PS 5 Cl. In this work, the disorder of anion sites is modestly regulated by adjusting the ratio of S and Cl in Li 6−x PS 5−x Cl 1+x electrolyte. In addition, to verify the commonality of this strategy, Li 5.6 PS 4.6 Cl 1.4 is prepared using self-made Li 2 S, and similar results are obtained. On this basis, the density of Li 5.6 PS 4.6 Cl 1.4 electrolyte sheet is improved by hot-pressing, which can successfully inhibit the growth of lithium dendrites . As expected, the ionic conductivity of the sulfide electrolyte and the electrochemical performance of the ASSLBs are greatly improved. A highest ionic conductivity of 8.2 × 10 −3 S cm −1 of Li 5.6 PS 4.6 Cl 1.4 is obtained at room temperature. A high capacity retention of 99.99 % is maintained for NCM811 @Li 2 O//Li 5.6 PS 4.6 Cl 1.4 //Li-In system after 400 cycles at 1 C with ultra-high cathode loading of 35.6 mg cm −2 . Besides, the cost of sulfide electrolytes can be reduced as the decreased usage of Li 2 S. This work proposes a novel synthesis method of low-cost and high-performance Li 6−x PS 5−x Cl 1+x electrolytes.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xiaowei Kong,Xiaoliang Zhou,Yu Tian,Xiaoyan Wu,Jun Zhang,Wei Zuo,Xiaobo Gong,Zhanhu Guo
A novel La 0.9 Ca 0.1 Fe 0.9 Nb 0.1 O 3-δ (LCFNb) perovskite for solid oxide fuel cells (SOFCs) anode is prepared by means of the citrate-nitrate route and composited with Ce 0.8 Sm 0.2 O 1.9 (SDC) by impregnation method to form nano-scaled LCFNb/SDC anode catalytic layers. The single cells with LCFNb and LCFNb/SDC impregnated anodes both achieve relatively high power output with maximum power densities (MPDs) reaching up to 610, 823 mW·cm −2 in H 2 at 800 °C, respectively, presenting a high potential of LCFNb for use as SOFCs anode. The power outputs of the single cells with LCFNb/SDC composite anode in CO and syngas (CO H 2 mixture) are almost identical to that in H 2 at each testing temperature. This composite anode also presents excellent durability in both H 2 and CO for as long as 50 h, showing desirable anti-reduction and carbon deposition resistance abilities. Besides, the cell output is stable in 100 ppm H 2 S H 2 atmospheres for 20 h at a current density of 600 mA·cm −2 with negligible sulfur accumulation on the anode surface . Hence, a novel iron based perovskite LCFNb anode with remarkable cell performance, carbon deposition resistance and sulfur poisoning tolerance for SOFCs is successfully obtained.
研究领域:
材料科学
·
电化学
·
能源材料
·
无机非金属材料
·
功能陶瓷
·
清洁能源技术
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·Vol. 19
·期 1
·2401012
·
IF 9.8
Pengcheng Jian,Maohua Chen,Dongyan Li,Yongming Zhao,Weijie Liu,Yuang Luo,Xiantai Tian,Meng Peng,Xing Zhou,Jiangnan Dai,Feng Wu,Changqing Chen
The extraordinary mechanical compliance of 2D molybdenum disulfide (MoS 2 ) makes it an ideal candidate for strain modulation of various electrical and optical properties. However, developing facile methods for accurate and stable engineering of strain still remains a major challenge. Here, a novel and effective method is demonstrated for introducing periodic strain into monolayer MoS 2 by direct growth on nano-patterned sapphire substrates (NPSS). A mixed aqueous solution of Na 2 MoO 4 and NaOH is spin-coated on the NPSS and sulfurated in one step by chemical vapor deposition (CVD). Highly oriented monolayer MoS 2 single-crystal nanosheets with high quality and few sulfur vacancies are achieved conformally on the NPSS via a liquid-mediated growth mode. Notably, the periodically distributed blue shift of the PL emission peak demonstrated periodic compressive strain is introduced into the nano-patterned MoS 2 via the thermal expansion difference between MoS 2 and substrates. Furthermore, photodetectors fabricated using the nano-patterned monolayer MoS 2 exhibit a high photo-to-dark current ratio (PDCR) over 10 6 , an excellent detectivity of 5.4 × 10 13 Jones, and a fast photoresponse of 7.7 ms, owing to the strain-induced back-to-back built-in electric field, enhanced light absorption by light-scattering effect and fewer S vacancy defects. The scanning imaging demonstration based on the single-pixel nano-patterned MoS 2 photodetector further confirms its great potential in image sensors. This work hereby presents a pathway for direct conformal growth of nano-patterned monolayer MoS 2 with precisely periodic strain, which should inspire the applications for high-performance optoelectronic devices via the strategy of patterned substrate engineering by the periodic nanostructures.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
凝聚态物理
·
表面科学
·
半导体器件
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 29
·2202622
·
IF 15.153
Hao Zhu,Zixuan Chen,Yun Chen,Jun-Jie Zhu
Quantifying the binding kinetics and affinities of protein–small molecule interactions is critical for biomarker validation, drug discovery, and deep understanding of various biological processes at the molecular-scale. Novel approaches are demanded as most common label-free techniques are mass-sensitive, which are not suitable for the detection of small molecule interactions. Here, an optical imaging platform is developed to measure the binding kinetics of both protein–small molecules and protein–ions based on monolayer MoS 2 , an ultra-thin 2D material whose optical absorption is extremely sensitive to charge. A model is established to calibrate the optical response due to the charged analyte binding and it is applied to quantify the interactions between abl1 kinase and different small-molecule inhibitors. Such a presented method is capable of distinguishing different inhibitors binding to a wild or mutated kinase, which provides guidance for drug evaluation and drug mechanism exploration. The binding kinetics of calcium ions to calmodulin is also measured, further broadening the application field of the method. In addition, the imaging capability allows mapping the local binding kinetics of the molecular interactions with a high resolution, which reveals visible spatial variability and offers a promising tool for studying heterogeneous local interfacial interactions.
研究领域:
分子生物学
·
药物发现
·
生物传感器
·
化学生物学
·
生物物理
·
转化医学
·
纳米生物技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）