CERAMICS INTERNATIONAL
·
2019
·Vol. 45
·期 12
·15589-15595
·
IF 3.45
Sining Yun,Yuzhi Hou,Chen Wang,Yangliang Zhang,Xiao Zhou
Mo-based binary/ternary nanocomposites were designed and prepared via soft template synthesis by combining Mo 2 C and Bi/Mo 2 C into mesoporous carbon (MC). The materials were characterized by using various analytical and electrochemical techniques . When Mo 2 C/MC composites were used as counter electrodes (CEs) in iodide-mediated dye-sensitized solar cells (DSSCs), the power conversion efficiencies (PCEs) of the cells reached 7.29%, and the performance of DSSC with Bi/Mo 2 C/MC was 8.06%, which was much higher than that of the cell with Pt CE (7.08%). The excellent electrochemical stability of Mo-based nanocomposites in triiodide/iodide electrolyte indicated that they could be promising alternatives to Pt electrodes in DSSCs. This work provided a new idea for the development of metal/carbide/carbon nanocomposite CE materials for DSSCs.
研究领域:
材料科学
·
能源化学
·
电化学
·
纳米科技
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 38
·23415-23421
·
IF 3.108
Sheng Yuan,Ming-Jian Zhang,Xiaoyang Yang,Zongwei Mei,Yongji Chen,Feng Pan
MoS2, a representative two-dimensional transition metal dichalcogenide, gains significant interest due to its unique layered structure and electronic structure. In this work, a novel MoS2-based hybrid thin film was constructed by disordered stacking of MoS2–NMP hybrid particles, which were mainly composed of MoS2(NMP)3 molecules stacking in a nearly-parallel manner through S⋯H–C hydrogen bonds. Interestingly, it presents a higher work function (5.42 eV) than Au (5.32 eV), and a unique thickness-dependent conductivity with p-type semiconductor characteristic. Using it as the back contact of CdTe solar cells, the efficiency was improved by 2.6% compared to the traditional cells, mainly from the great improvement in short-circuit current density (Jsc). This significant improvement in solar performance was ascribed to the matchable energy levels at the CdTe/MoS2-based thin film interface and its unique thickness-dependent conductivity. This work opens a new direction for the extensive applications of TMD-based materials.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
半导体物理
·
表面科学
·
能源材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yao Zhu,Huan Yi,Qiaoyan Hao,Jidong Liu,Yuxuan Ke,Zhuo Wang,Dianyuan Fan,Wen jing Zhang
Monolayer WS 2 (1L-WS 2 ) possesses direct band gap, which is beneficial for light emitting applications. However, high quality sample obtained via mechanical exfoliation suffers from ultralow yield of large flakes while large 2D material monolayers synthesized by chemical vapour deposition (CVD) unintentionally induce many defects, resulting in low photoluminescence (PL) intensity. Herein, we firstly control the 1L-WS 2 scalable growth through H 2 introduction at the beginning of the CVD synthesis. Its domain size can be increased from 1 μm up to 20 μm with higher coverage, compared to that synthesized without H 2 introduction. Then, we propose scalable ways to anneal the obtained large 1L-WS 2 in Ar diluted hydrogen sulfide (H 2 S) atmosphere at 750 °C or to treat it with (3-mercaptopropyl) trimethoxysilane (MPS). Its PL intensity can be increased to 12 times by H 2 S or more interestingly to 30 times by MPS, respectively. Our systematic analyses show that the drastic PL improvements are mainly attributed to the reduction of structural defects by H 2 S and MPS, which is facilitated via the H– bond in them. The results help to explore routes to obtaining large-size single crystalline transition metal dichalcogenides monolayer (1L-TMDCs) and intense PL emission.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
表面科学
·
半导体材料
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Xuemin Chen,Ruihong Liu,Shizhang Qiao,Jing Mao,Xiwen Du
Laser irradiation is a green, simple and efficient technique for material synthesis. A laser-activated-catalyst (LAC) technique is proposed for fabrication of nanowires in solution under ambient conditions. In the present work, effects of intrinsic influential factors such as the activity of precursor, precursor concentration, laser energy density and laser irradiation time on the LAC growth of cadmium chalcogenide nanowires are systematically investigated, which help to reveal the fundamental principles of LAC technique. Laser energy density and activity of precursor are proven to be vital for the growth of nanowires, and our work demonstrates that LAC is a universal way for synthesis of cadmium chalcogenides semiconductors.
研究领域:
材料科学
·
纳米技术
·
半导体材料
·
无机化学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Zhenhua Wang,Jing Zhang,Yuxiang Yang,Xinyang Yue,Xiaoming Hao,Wang Sun,David Rooney,Kening Sun
Traditionally polyvinylidene fluoride membranes have been used in applications such as membrane distillation , wastewater treatment , desalination and separator fabrication. Within this work we demonstrate that a novel carbon nanofiber/polyvinylidene fluoride (CNF/PVDF) composite membrane can be used as an interlayer for Lithium Sulfur (Li S) batteries yielding both high capacity and long cycling life. This PVDF membrane is shown to effectively separate dissolved lithium polysulfide with the high electronic conductivity CNF not only reducing the internal resistance in the sulfur cathode but also helping immobilize the polysulfide through its abundant nanospaces. The resulting Li S battery assembled with the CNF/PVDF composite membrane effectively solves the polysulfide permeation problem and exhibits excellent electrochemical performance. It is further shown that the CNF/PVDF electrode has an excellent cycling stability and retains a capacity of 768.6 mAh g −1 with a coulombic efficiency above 99% over 200 cycles at 0.5C, which is more than twice that of a cell without CNF/PVDF (374 mAh g −1 ). In addition, the low-cost raw materials and the simple preparation process of CNF/PVDF composite membrane is also amenable for industrial production.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 21
·
IF 1.64
Yang Meng,Junfeng Chu,Chaohao Liu,Zheng Wei,Liqun Zhang
A series of poly(methylvinylsiloxane) elastomer (VMQ) composites with improved oil resistance were prepared by introducing uniform polar polymer phases into VMQ matrix through the in situ reaction of reactive polar monomers—hydroxyethyl methacrylate (HEMA) and hydroxypropyl methacrylate (HPMA)—during peroxide curing. Differential scanning calorimetry and Fourier transform infrared measurements demonstrated that HEMA and HPMA had high reactivity and most of the monomers participated in the in situ reaction during peroxide curing. Transmission electron microscopic images showed that the uniform nanophases with the diameters in the range of 20–50 nm formed in the VMQ vulcanizates. The generated nanophases could interact with silica to form a strong filler network in the VMQ matrix, resulting in a significant increase of the modulus at low elongation of the VMQ vulcanizates. With increasing the content of polar monomers, the tensile strength decreased slightly, the elongation at break, the hardness and the 100% modulus increased, but the 300% modulus decreased significantly due to the decrease of the crosslink density. The incorporation of HEMA or HPMA into VMQ matrix could significantly improve the oil resistance of polysiloxane elastomer, and the oil resistance of the composites containing HEMA was a little better than that of the composites containing HPMA. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40983.
研究领域:
高分子科学
·
材料科学
·
复合材料
·
弹性体
·
功能高分子
·
纳米材料
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2020
·
IF 3.107
Yayu Guo,Huilan Guan,Wenxiu Peng,Xuelei Li,Yue Ma,Dawei Song,Hongzhou Zhang,Chunliang Li,Lianqi Zhang
Li 7 P 3 S 11 (70Li 2 S·30P 2 S 5 ) sulfide is a promising electrolyte candidate for all-solid-state lithium batteries (ASSLBs) owing to its high ionic conducivity and wide electrochemical stability window. However, the sensitivity to moisture and the poor interfacial compatibility with electrodes limit the conventional application of Li 7 P 3 S 11 . Herein, we present a substitution strategy to produce a O-incorporated 70Li 2 S·(30-x)P 2 S 5 ·xP 2 O 5 (mol%) sulfide electrolyte to address above issues. The elaborately designed electrolyte is prepared via wet vibration ball milling technique with P 2 O 5 substitution content of 1, 3 and 5. As a result, the 70Li 2 S·27P 2 S 5 ·3P 2 O 5 electrolyte displays the highest ionic conductivity of 2.61× 10 −3 S cm −1 which outperforms than that of pristine Li 7 P 3 S 11 (ionic conductivity of 1.35 × 10 −3 S cm −1 ) and the assembled LiCoO 2 @LiNbO 3 /70Li 2 S·27P 2 S 5 ·3P 2 O 5 /Li-In ASSLB exhibits the superior capacity retention of 93.2% after 100 cycles at 0.5C. The reason for the developed electrochemical performance lies in the substitution of the non-bridging sulfur atom with bridging oxygen atom, from which the interaction between electrolyte and lithium ions is weakened, thereby the rapid transfer of lithium ions is facilitated. Furthermore, Raman and XRD results indicate that the adverse interfacial reactions are suppressed through P 2 O 5 substitution. This work suggests that P 2 O 5 substitution is an effective strategy for sulfide electrolyte toward high energy all-solid-state lithium batteries.
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
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Qing Xuan Shi,Chen Chang,Hui Jie Pei,Xin Guan,Liang Liang Yin,Xiao Lin Xie,Yun Sheng Ye
The lithium–sulfur (Li–S) battery holds great promising for the next-generation energy storage system due to its high theoretical specific capacity and energy density . However, the poor conductivity of sulfur species and the “shuttle effect” of polysulfides (PSs) severely limit the practical application of Li–S battery. Here, a large-scaled covalent triazine framework/multiwall carbon nanotube (CTF/MWCNT) hybrid used as a multi-functional separator modifier combining strong PSs-anchor ability of CTF with high electrical conductivity of MWCNT was proposed. The ordered porous structure and large specific surface area of CTF make it good physical trap ability for PSs shuttle, and the abundant pyridinic nitrogen groups of CTF render it effectively adsorb PSs by chemical sorption , while the high electrical conductivity of MWCNT can facilitate electron transfer . As it turns out that the multi-functional separator applied in Li–S battery shows significant enhancements in the utilization of sulfur, specific capacity, Columbic efficiency, rate capability (982 mAh g −1 at 2 C) and cycling stability (0.045% specific capacity loss per cycle at 1 C along 1000 cycles) as well as suppression of self-discharge and Li dendrite growth. Furthermore, it is practicable to incorporate the slurry cast multi-functional layer onto the commercial separator, which provides ideas for constructing advanced multi-functional separators for commercially viable Li–S battery.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米复合材料
·
电池技术
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 9
·4257-4265
·
IF 2.394
Jiang Huize,Han Yu,Wang Hui,Zhu Yuhao,Guo Qingpeng,Jiang Haolong,Zheng Chunman,Xie Kai
The poor interface between the active materials, solid electrolytes, and conductive additives in composite cathode materials is the key factor restricting the performance of the all-solid-state lithium-sulfur battery. Here, the composite cathode material was prepared through the method of one-step ball milling. The sulfide electrolyte Li 3 PS 4 (LPS) was formed on the surface of the active material Li 2 S while the conductive additives were incorporated, and the conductive ions and electronic network were constructed simultaneously. After adding an appropriate amount of carbon nanotubes (cnt), the composite cathode exhibited high specific capacity of 1145.2 mAh g −1 after 30 times of cycling at a current density of 0.2 mA cm −2 , and the battery with ultrahigh areal Li 2 S loading also displays high capacity of 962.6 mA g −1 . The composite cathode with high Li 2 S content (56.3%) was prepared, with excellent performance exhibited: the capacity is 741 mAh g −1 after 30 times of cycling at a current density of 0.2 mA cm −2 .
Without additional sulfide electrolyte, the composite cathode materials were prepared by one-step ball milling with lithium sulfide, phosphorus pentasulfide, acetylene black, and carbon nanotubes as raw materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Mingyang Gao,Wen Zhang,Zhuo Cao,Manzhang Xu,Wu Zhao,Zhiyong Zhang
At the 2022 Beijing Winter Olympics, the concept of sustainable development impressed the world. This study is supported by the concept of ecological protection and conservation. The easily available plastic bottled Coca-Cola® was innovatively proposed as a low-cost solvent to greenly exfoliate bulk tungsten disulfide (WS 2 ). First, an overview of two-dimensional (2D) WS 2 was given, summarizing the related reports on its structures and synthesis. Taking into account the yield of 2D flakes, the optimal fabrication environment was figured out. The related characterizations of the cola-synthetic WS 2 were studied. This work opens up a new strategy for the inexpensive and green exfoliation of 2D crystals with a high yield.
研究领域:
材料科学
·
纳米科技
·
绿色化学
·
无机合成
·
二维材料
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Jingguang Yi,Dan Zhou,Yuhao Liang,Hong Liu,Haifang Ni,Li-Zhen Fan
All-solid-state lithium batteries (ASSLBs) employing sulfide electrolyte and lithium (Li) anode have received increasing attention due to the intrinsic safety and high energy density. However, the thick electrolyte layer and lithium dendrites formed at the electrolyte/Li anode interface hinder the realization of high-performance ASSLBs . Herein, a novel membrane consisting of Li 6 PS 5 Cl (LPSCl), poly(ethylene oxide) (PEO) and Li-salt (LiTFSI) was prepared as sulfide-based composite solid electrolyte (LPSCl-PEO3-LiTFSI) (LPSCl:PEO = 97:3 wt/wt; EO:Li = 8:1 mol/mol), which delivers high ionic conductivity (1.1 × 10 −3 S cm −1 ) and wide electrochemical window (4.9 V vs. Li + /Li) at 25 °C. In addition, an ex-situ artificial solid electrolyte interphase (SEI) film enriched with LiF and Li 3 N was designed as a protective layer on Li anode (Li(SEI)) to suppress the growth of lithium dendrites. Benefiting from the synergy of sulfide-based composite solid electrolyte and ex-situ artificial SEI, cells of S-CNTs/LPSCl-PEO3-LiTFSI/Li(SEI) and Al 2 O 3 @LiNi 0.5 Co 0.3 Mn 0.2 O 2 /LPSCl-PEO3-LiTFSI/Li(SEI) are assembled and both exhibit high initial discharge capacity of 1221.1 mAh g −1 (135.8 mAh g −1 ) and enhanced cycling stability with 81.6% capacity retention over 200 cycles at 0.05 C (89.2% over 100 cycles at 0.1 C). This work provides a new insight into the synergy of composite solid electrolyte and artificial SEI for achieving high-performance ASSLBs .
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
界面工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yiheng Yue,Guocheng Pan,Jun Wan,Zhen Xiao,Yang Zhang,Shiqing Xu,Gongxun Bai
Mechanoluminescent (ML) materials offer significant potential for remote stress sensing and distribution. However, creating highly sensitive and responsive ML materials remains a challenge. In this study, mechanoluminescent semiconductor materials have been successfully prepared as Mn 2+ doped ZnS-SrZnOS heterojunction composites. These materials exhibit high-resolution stress distribution visualization and rapid response, captured via camera recording. Notably, they possess a low stress triggering threshold, reaching the KPa level, and respond within milliseconds. Furthermore, it was found that by adjusting the doping concentration of Mn 2+ within the heterojunction, the material utilizes its bimodal emission capability to manipulate the fluorescence shift and achieve optical anti-counterfeiting. The synthesis of smart films by combining the material with polydimethylsiloxane matrix had enabled the achievement of collision detection, information hiding and optical anti-counterfeiting. These results suggest that the prepared smart films have wide range of optical sensing applications.
研究领域:
材料科学
·
纳米科技
·
光学传感
·
功能材料
·
固态物理
·
表面与界面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）