MOLECULES
·
2018
·Vol. 23
·期 5
·1105
·
IF 3.098
Wei Yang,Xiangyang Lei,Haohao Hui,Qinghua Zhang,Xueran Deng
Moisture-resistant silicone coatings were prepared on the surface of potassium dihydrogen phosphate (KDP) crystal by means of spin-coating, in which hydrophobic-modified SiO2nanoparticles were embedded in a certain proportion. The refractive index of such coating can be tuned arbitrarily in the range of 1.21–1.44, which endows the KDP optical component with excellent transmission capability as well as the moisture proof effect. A dual-layer anti-reflective coating system was obtained by covering this silicone coating with a porous SiO2coating which is specially treated to enhance the moisture resistance. Transmittance of such a dual-layer coating system could reach 99.60% and 99.62% at 1064 nm and 532 nm, respectively, by precisely matching the refractive index of both layers. Furthermore, the long-term stability of this coating system has been verified at high humidity ambient of 80% RH for 27 weeks.Keywords:moisture-resistant;refractive index tunable;high-power laser system
研究领域:
光学材料
·
涂层技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Honglai Zhang,Zhaohui Li,Shishun Yu,Qizhen Xiao,Gangtie Lei,Yanhuai Ding
Carbon-encapsulated LiMn 2 O 4 (LMO@C) spheres were prepared using polymer microgel reactor, in which Mn 2+ ions are hydrolyzed in situ to form Mn(OH) 2 , and followed by annealing at a high temperature. The LMO@C spheres are constructed with the spinel LiMn 2 O 4 nanospheres that embedded in a porous carbon matrix uniformly. Owing to possessing three-dimensional (3D) electron-conductive and 3D ion-conductive networks, the LMO@C spheres exhibit high rate capability. They can deliver the specific capacities of 142, 137, 126, 107, and 91 mAh g −1 at the rates of 0.1C, 1C, 5C, 10C, and 20C (1C = 148 mA g −1 ), respectively. Owing to carbon encapsulation, the LMO@C spheres can retain 80% of the initial capacity at 1C rate after 1000 cycles at 25 °C, displaying stable cycling performance. The results suggest that the LMO@C spheres are promising cathode materials for high-power lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Chunhai Jiang,Jing Zhao,Huiqing Wu,Zhimin Zou,Renzhong Huang
Hybrid anodes with Li 4 Ti 5 O 12 nanoparticles uniformly embedding in a mesoporous activated carbon matrix are prepared by CO 2 activation of copolymerized resorcinol and hexamethylenetetramine loaded by lithium acetate and tetrabutyl titanate . The Li 4 Ti 5 O 12 /activated-carbon hybrid anodes show increased capacity retention as the activated carbon content in the composite increases, although their overall specific capacity decreases gradually. The hybrid anode with an activated-carbon content of 54 wt% exhibits the highest capacity retention of 67% at 4 A g −1 referencing to that at 0.1 A g −1 . When coupling it with commercial AC cathode, the Li-ion capacitor displays an outstanding high energy density of 38 Wh kg −1 even at a high power density of 7964 W kg −1 . Moreover, an energy density retention of 90.8% after 2000 cycles at 1 A g −1 is preserved, demonstrating its very stable cycle performance. The results reported in this work indicate that the Li 4 Ti 5 O 12 /activated-carbon hybrids prepared by the proposed copolymerization and post-activation process may be very promising anode materials of Li-ion capacitors designed for high power applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2020
·
IF 3.762
Yuehua Weng,Guorong Chen,Fei Dou,Xianhuan Zhuang,Qiyu Wang,Mi Lu,Liyi Shi,Dengsong Zhang
Silicon (Si) attracts attention for its ultra-high theoretical specific capacity (3579 mAh g −1 ) as anodes for lithium-ion batteries (LIB). However, adjusting the contradiction between long life and volume expansion has always been a great challenge for Si-based anodes. In this work, we designed a mulberry-like Si-based anode material (p-SiO x /SiC@C) by an in situ self-assembly and magnesium reduction approach. The most outstanding advantage of this strategy is the formation of silicon carbide (SiC) interlayer between SiO x and carbon coating, which hinders the further reduction of SiO x and realizes controllable specific capacity. The SiC interlayer on the SiO x surface can effectively prevent the electrolyte from penetrating and stabilize the solid electrolyte interphase (SEI) well. As a result, p-SiO x /SiC@C shows stable Li + storage performance and ultra-long cycle stability. Even after 2000 cycles under 2.0 A g −1 , p-SiO x /SiC@C still maintains a complete morphology; the capacity retention rate is about 79%; the capacity loss rate is only 0.01% per cycle on average; and it is even more gratifying that the average coulombic efficiency reaches 99.7%. This work opens up a new direction for the practical application of Si-based anode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-8
·
IF 15.7
Sun Wenlu,He Yulu,Fang Lei,Zeng Jinrong,Tang Enli,Hu Tingping,Zhang Hui,Lu Derong,Hu Chenji,Quan Zhilong,Kong Huabin,Chen Hongwei
Enhancing the durability of electrodes under high-power conditions is crucial for advancing high-power secondary batteries. Despite numerous optimization strategies proposed to mitigate electrode structural degradation, the performance of common electrodes inevitably deteriorates under high currents over extended cycling life. In this study, we report a capacity refreshing strategy for a porous organic framework electrode operating under high power conditions. By intermittently applying low currents, deactivated ions trapped within the framework can be effectively released, thus refreshing the electrode’s capacity. Importantly, this capacity refreshing can be periodically repeated. The framework electrode thus achieves an extended cycle life of over 60,000 cycles at 20 C (6 A/g) with a specific power of 28 kW/kg (based on active material). This strategy represents an alternative concept for designing organic electrodes that combine high power and long cycle life.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2015
·
IF 2.729
Shengyang Dong,Xiaoyan Wang,Laifa Shen,Hongsen Li,Jie Wang,Ping Nie,Jingjie Wang,Xiaogang Zhang
To enhance kinetics of lithium insertion/extraction of anode materials for hybrid lithium-ion capacitors (hybrid LICs), we develop a new applicable strategy toward the synthesis of trivalent Ti self-doped Li 4 Ti 5 O 12 nanoparticles . Starting with Ti 2 O 3 , we show that subsequent solid state reaction with Li 2 CO 3 leads to the formation of trivalent Ti self-doped Li 4 Ti 5 O 12 . The presence of trivalent Ti gives rise to high electric conductivity and the nanostructure reduces the transport path lengths of lithium-ions and electrons, permitting fast kinetics for both transported lithium-ions and electrons, thus enabling high-power performance. A high performance hybrid LIC is fabricated by using Ti 3 + self-doped Li 4 Ti 5 O 12 as an insertion-type anode and activated carbon derived from outer peanut shell as cathode, which delivers high energy density (67 Wh kg − 1 ), high power density (8000 W kg − 1 ). Additionally, the device still retains about 79% of its original capacity even after 5000 cycles at 0.5 A g − 1 .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2022
·Vol. 128
·期 8
·1-5
·
IF 2.983
Liu Biaojie,Yang Guoren,Meng Xianwei,Si Yunfei
Thermal stability is the main problem affecting the application of inorganic fluorescent materials in high-power LED devices. Here, we have synthesized a green light-emitting phosphor Na 2 Ca 1-x Ge 6 O 14 : xTb 3+ with high luminescence thermal stability mainly through high temperature solid-state reaction. By changing the concentration of doping ions, the traps concentration of the material can be increased, so that the thermal stability of the material can be improved, which is attributed to the traps compensating greater than the thermal quenching effect. This method of utilizing traps to improve thermal stability provides a potential synthesis strategy for improving high-power white LED used in automotive.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
LASER PHYSICS LETTERS
·
2019
·Vol. 16
·期 11
·115101
·
IF 2.328
Z P Zhao,C F Yao,Z R Li,Z X Jia,G S Qin,Y Ohishi,W P Qin
We reported a multi-watt ~2.1 µm laser output from a 30 cm long Ho3+-doped fluorotellurite microstructured fiber (FTMF) pumped by a homemade 1980 nm Tm3+-doped silica fiber laser. When the pump power was increased to 61.8 mW, lasing at 2067 nm was achieved from the Ho3+-doped FTMT, and an unsaturated maximum output power of ~8.08 W was obtained for a pump power of ~10.56 W. The corresponding slope efficiency was about 77.21%. During our experiments, no obvious damage was observed on the end face of the Ho3+-doped FTMF. Our results indicated that Ho3+-doped fluorotellurite fibers had the potential for constructing high power fiber lasers at 2.1 µm.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Changyuan Dong,Wenpeng Hong,Lei Zhang,Jingrui Lan,Yan Li,Haoran Li
Ion migration-based moisture-electric generator holds the open-circuit voltage to power portable electronics, the Internet of Things, and wireless transmission. However, most devices still encounter challenges with the attainment of high-density power generation in continuous mode. Here, we introduce a sustainable and high-power density ion-selective bipolar moisture-electric generator that relies on Au-Al electrodes, capillary water supply, and interfacial evaporation. The device generates electricity by exploiting the salinity gradient between the capillary waterways in the photothermal and waste heat layers. This process is synergized by electrochemical reactions of the electrodes, which propel the migration of cations and anions through ion-selective bipolar hydrogels toward the intermediate waterway. It demonstrates a short-circuit current density of 52.2 A m −2 and a power density of up to 33.8 W m −2 over 0.5 cm × 0.5 cm electrodes. Connecting 13 devices in series in darkness successfully illuminates an LED lamp with a rated power of 1 W together with an operating voltage of 2.0–2.8 V. This work offers an off-grid, environmentally friendly, and affordable solution for high-density moisture power generation.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 8
·2102201
·
IF 10.05
Jiexin Li,Zongtao Li,Jiayong Qiu,Jiasheng Li
Quantum dots (QDs) exhibit remarkable photoelectric performance. However, the conversion efficiency and thermal performance of QD converters so far is not satisfactory for high-power solid-state light (SSL) applications owing to the serious reabsorption loss of QDs and the poor thermal diffusion of polymer materials. Here, an efficient QD converter based on an anodic aluminum membrane (AAM), with high light enhancement and thermal diffusion, is introduced for high-power SSL applications. Nanoporous AAMs are utilized as templates for confining the QD deposition into the nanowire (NW) shape by incorporating inkjet printing and vacuum-deposition methods, forming vertical QD NW arrays. Compared with conventional converters, QD-AAM yields nearly twofold photoluminescence intensity. Three-dimensional finite-difference (FDTD) simulations attribute the fluorescence-enhancement mechanism to the enhancement of QD conversions and boosting of the waveguide effect in QD-AAM. Furthermore, QD-AAM exhibits excellent thermal diffusion performance under high-power excitation, owing to the inner heat conduction path in the AAM framework. This study provides a practical and efficient strategy to comprehensively enhance the optical and thermal performance of QD converters for high-power SSL applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 23
·5038
·
IF 2.217
Xue-Ran Deng,Wei Yang,Hao-Hao Hui,Qing-Hua Zhang,Qiao Xu,Jin-Ju Chen,Ji-Liang Zhu,Xiang-Yang Lei
A high-power laser system is employed to drive the fusion ignition to realize sustainable supply of green energy according to the inertial confinement fusion theory, in which frequency-converting crystals are sealed in the terminal vacuum chamber and utilized to turn the incident laser (1053 nm) to the desired one (351 nm). However, the reflected 351 nm laser from the pellet hohlraum that goes back through the frequency-converting crystal is found to be harmful for the upstream elements that are located before the terminal chamber. In this study, a specialized coating system for the frequency-converting crystals was designed and fabricated to both ensure high output power for the fusion and reduce the reflected 351 nm laser energy by absorption. Furthermore, the structural, mechanical, and laser-damage resistant properties of this coating were investigated as well.Keywords:high-power laser system;frequency-converting crystal coating;reflected 351 nm laser
研究领域:
光学材料
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Mei Guo,Yu Li,Kewen Du,Chaochao Qiu,Gang Dou,Guoxin Zhang
Improving specific energy of supercapacitors (SCs) at high power has been intensively investigated as a hot and challengeable topic. In this work, hierarchically porous carbon (HPC) materials with well-defined meso-/macro-pores are reported via the dehalogenation reaction of polyvinyl fluoride (PVDF) by NaNH 2 . The pore hierarchy is achievable mainly because of the coupled effects of NaNH 2 activation and the template/bubbling effects of byproducts of NaF and NH 3 . Electron microscopy studies and Brunauer–Emmett–Teller (BET) measurements confirm that the structures of HPC samples contain multiple-scale pores assembled in a hierarchical pattern, and most of their volumes are contributed by mesopores. Aqueous symmetric supercapacitors (ASSCs) were fabricated using HPC-M7 materials, achieving an ultrahigh specific energy of 18.8 Wh kg −1 at specific power of 986.8 W kg −1 . Remarkably, at the ultrahigh power of 14.3 kW kg −1 , the HPC-ASSCs still output a very high specific energy of 16.7 Wh kg −1 , which means the ASSCs can be charged or discharged within 4 s. The outstanding rate capacitive performance is mainly benefited from the hierarchical porous structure that allows highly efficient ion diffusion.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）