SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2015
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IF 2.353
Ke Wang,Wenlin Feng,Xu Feng,Yao Li,Peng Mi,Shasha Shi
Zn 0.997 WO 4 : Pr 3 + 0.003 and different concentrations (0.1 mol% to 0.9 mol%) of Pr, Li co-doped ZnWO 4 red phosphors were prepared by means of solid-state reaction process. The crystalline, surface morphology and luminescent properties of Zn 0.997 WO 4 : Pr 3 + 0.003 and Zn 1 − x − y WO 4 : x Pr 3 + , y Li + phosphors were investigated by the X-ray diffraction patterns (XRD), scanning electron microscope (SEM) and fluorescent measurements. From powder XRD analysis, the formation of monoclinic structure with C 2 / h point-group symmetry and P 2 / c space group of the as-synthesized samples is confirmed. The SEM image showed that surface morphology of the phosphor powder is irregular cylindricality. The luminescent spectra are dominated by the red emission peaks at 607, 621 and 643 nm, respectively, radiated from the 1 D 2 → 3 H 4 , 3 P 0 → 3 H 6 and 3 P 0 → 3 F 2 transitions of Pr 3 + ions. The concentrations of the highest luminescent intensity is determined at 0.3 mol% Pr 3 + and 0.3 mol% Li co-doped ZnWO 4 powder crystal, and the peak intensity is improved more than 3 times in comparison with that of 0.3 mol% Pr 3 + single-doped ZnWO 4 . The enhanced luminescence comes from the improved crystalline and from the charge compensation of Li + ions. The decay curve and CIE chromaticity coordinates of as-prepared samples are also studied in detail.
研究领域:
材料科学
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发光材料
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固态化学
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光学材料
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荧光粉技术
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DOI
高影响因子
NATURE
·
2026
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IF 56.1
Liu Lei,Xiang Yuxuan,Lu Xingyu,Wang Jianhui
Anode-free lithium metal batteries (AFLMBs), which are manufactured without anode active material, offer great potential for high-energy-density, low-cost energy storage. However, AFLMBs face a long-standing challenge of short lifespan due to the harsh conditions of lacking excess Li-resource and an anode host 1-8 . This issue is associated with uneven Li deposition/dissolution, rooted in the micro-heterogeneity and mechanical fragility of solid electrolyte interphase (SEI) 9 . Here we report a practical 500 Wh kg –1 -level AFLMB with enhanced lifespan, achieved using a crossover-coupled electrolyte. The electrolyte triggers crossover-coupled interfacial reactions that generate a B–F-based polymer-rich SEI at the anode while suppressing gas evolution at the cathode. The resulting SEI exhibits sub-nanometer homogeneity, high flexibility, and rapid Li-ion transport, and it spontaneously develops a self-adaptive mesh-film structure that ensures uniform ion flux and large-volume-change accommodation, thereby realizing reversible planar Li deposition/dissolution of 5.6 mAh cm –2 . Consequently, a 2.7 Ah AFLMB (508 Wh kg –1 , 1668 Wh L –1 ) without any host-material coating demonstrates stable cycling for 100 cycles at 100% depth of discharge (DoD) and 250 cycles at 80% DoD, with 80% capacity retention and a high-power output of 2650 W kg –1 at 96 Wh kg –1 . These findings establish crossover-coupled interphase chemistry and address the inherent structural instability of host-free electrodes, advancing the practical implementation of AFLMBs.
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International Journal of Electrochemical Science
·
2023
·Vol. 11
·期 1
·498-505
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IF 1.5
Jian Lu,Jianling Li,Zhixun Zhu,Yuguang Zhao,Cheng Chen,Feiyu Kang
Porous Co 3 Mo 3 N nanorods were prepared by hydrothermal process combined with ammonia annealing and applied as catalyst in Li-O 2 battery cell. The battery with the porous Co 3 Mo 3 N nanorods showed a higher initial discharge capacity of 7902.8 mAh/g c at current density of 100 mAh/g c than that with the pure Ketjen black. Moreover, the Co 3 Mo 3 N-based electrode displayed lower overpotential and better cycling performance than that of the carbon-only cathode. Such performance can be associated with the synergistic effects of high electrocatalytic activity and porous structure of the Co 3 Mo 3 N nanorods.
研究领域:
材料科学
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电化学
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储能
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纳米材料
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催化
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DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2024
·
IF 4.1
Guangyue Shen,Shunpeng Zhang,Xingyan Li,Yujun Fu,Xiang Li,Jiandong Jiang,Zhenli Wen,Qi Wang,Deyan He
Artificial vision systems have been extensively reported for processing unstructured data, performing pattern recognition, and performing visual simulations. Photonic synapses have become the core of most artificial vision systems due to their advantages such as low energy consumption and ultra-fast signal transmission. However, their integration is difficult, the integration difficulty of photon synapses is higher than that of crossbar arrays. Moreover, due to the hybrid drive of light and external power supply, low energy consumption and weight update under full optical control cannot be achieved. Here, we designed a fully light-controlled multifunctional artificial vision reflex arc system. The solar cell and oscillator generate presynaptic voltage signals that are then transmitted to a lithium-ion-based memristor for the stimulation of different wavelengths and light intensities. The results show that our artificial vision system can distinguish wavelength and light intensity information and has good weight update symmetry and repeatability. Finally, the deformation experiment of the shape memory alloy demonstrated that the system can be used for controlling artificial muscles under different light signals.
研究领域:
光电子学
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神经形态工程
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人工智能
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智能材料
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光子计算
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Waquar Ahmed Khokhar,Ning Zhao,Weilin Huang,Hao Wang,Zhijie Bi,Xiangxin Guo
Solid-state batteries with alkali metals (Li, Na, etc.) as anodes have the potential to achieve high energy density. However, the Li penetration through the garnet occurs without preindication during electrochemical cycling, leading to sudden short circuit and safety concerns. Various improvement strategies are developed but such a problem still exists when the current density exceeds the critical value. In contrast, the electrochemical Na plating/stripping on the β″-alumina ceramic electrolyte (BASE) has been explored with improved interfacial contacts by introducing an Au intermediate layer. When being cycled around the critical current density, the polarization potential of the Na/Au/BASE symmetric cells increases progressively until it stabilizes at a certain value without the sudden short circuit. It is revealed that the increasing polarization originates from a gradual Na penetration into the BASE ceramics from the interface and the subsequent stable cycles correlate with the formation of a sustainable Na/Au/BASE interface. These results disclose the difference in a growth model of metal filaments through Li and Na solid electrolytes, shedding new light on understanding of the metal penetration in solid electrolytes.
研究领域:
材料科学
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电化学
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储能
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DOI
高影响因子
Energy & Environmental Materials
·
2022
·
IF 13.443
Haitao Zhang,Yuchen Wang,Junfeng Huang,Wen Li,Xiankan Zeng,Aili Jia,Hongzhi Peng,Xiong Zhang,Weiqing Yang
Ionic-conductive solid-state polymer electrolytes are promising for the development of advanced lithium batteries yet a deeper understanding of their underlying ion-transfer mechanism is needed to improve performance. Here we demonstrate the low-enthalpy and high-entropy (LEHE) electrolytes can intrinsically generate remarkably free ions and high mobility, enabling them to efficiently drive lithium-ion storage. The LEHE electrolytes are constructed on the basis of introducing CsPbI 3 perovskite quantum dots (PQDs) to strengthen PEO@LiTFSI complexes. An extremely stable cycling >1000 h at 0.3 mA cm −2 can be delivered by LEHE electrolytes. Also, the as-developed Li ¦ LEHE ¦ LiFePO 4 cell retains 92.3% of the initial capacity (160.7 mAh g −1 ) after 200 cycles. This cycling stability is ascribed to the suppressed charge concentration gradient leading to free lithium dendrites. It is realized by a dramatic increment in lithium-ion transference number (0.57 vs 0.19) and a significant decline in ion-transfer activation energy (0.14 eV vs 0.22 eV) for LEHE electrolytes comparing with PEO@LiTFSI counterpart. The CsPbI 3 PQDs promote highly structural disorder by inhibiting crystallization and hence endow polymer electrolytes with low melting enthalpy and high structural entropy, which in turn facilitate long-term cycling stability and excellent rate-capability of lithium-metal batteries.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xin Jiang,Junwei Zhou,Xinke Zhong,Zhaopeng Hu,Rongyan Hu,Yihu Song,Qiang Zheng
Electromagnetic interference (EMI) shielding materials with stretchability are important for developing wearable and flexible appliances. Herein, lithium bis(trifloromethanesulfonyl)imide (Li-TFSI)-doped poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and carboxylated styrene-butadiene rubber (XSB) latex are used to prepare stretchable EMI shielding composite films of 0.2 mm in thickness. In these films, the doped PEDOT:PSS nanoparticles form tenuous conductive pathways between the hexagonally packed latex particles, resulting in higher EMI shielding efficiency (EMI SE) compared with the films containing traditional dopant ethylene glycol. For the purpose of stretchable EMI shielding, the films containing 6 wt % PEDOT:PSS and 6 wt % Li-TFSI demonstrate EMI SE of 50 and 30 dB (12.4 GHz) at 0 and 100% strains, respectively, being the highest values among the reported shielding composites except for those using liquid metal as the filler. The investigation also provides a simple and environmentally friendly preparation method being highlighted for the development of lightweight stretchable EMI shielding materials for applications in flexible electronics in the near future.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Jiaqi Li,Long Chen,Fengling Wang,Zuoyu Qin,Ying Zhang,Ning Zhang,Xiaohe Liu,Gen Chen
Low lithium ion (Li + ) mobility and thermal stability of polyolefin separator are crucial obstacles that limit the utilization of Li metal electrodes in the age of rapid acceleration toward high-energy-density rechargeable batteries. Herein, we report anionic metal-organic frameworks (MOFs) modified separator to overcome the barriers. By grafting –SO 3 − group onto the Universitetet i Oslo (UIO) structure, the anionic MOFs nanoparticles are synthesized (noted as UIO-SOLi). The UIO-SOLi is adhered on the surface of Celgard 2400 via polyacrylic acid (PAA) to fabricate the modified separator (UIOSOL@PP). The MOFs coating optimizes the wettability and thermal stability of the pristine separator. Negatively charged moieties –SO 3 − within the pore surface electrostatically repel anions while facilitate the transport of Li + , thus achieving a high Li + transference number ( t Li + ) of 0.82. The effective Li + transport relieves the concentration polarization, regulates the Li + flow and realizes the uniform deposition of lithium. By implementing the UIOSOL@PP separator, the LiFePO 4 |Li cells deliver superior rate performance and cycling lifespan that renders a high discharge capacity retention of 155 mAh g −1 over 600 cycles at 1C. These results indicate that anionic MOFs modified separator is a promising strategy to modulate Li + flow and assist with efficient long-term operation of lithium metal batteries.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Tao Feng,Teng Zhao,Shuangfei Zhu,Ziheng Wang,Lei Wei,Nanxiang Zhang,Tinglu Song,Li Li,Feng Wu,Renjie Chen
Lithium–sulfur batteries are attractive because of their high specific capacity and energy density, but issues with the polysulfide dissolution and shuttling intrinsically hinder their wide application. Here, hydroxylate multiwalled carbon nanotubes (MWCNT-OH) were grafted with a supramolecular polymer (heptakis(6-amino-6-deoxy)-β-cyclodextrin) to form a polysulfide-engulfing net, which was coated on a separator. Such a molecular microarray structure of a polymer can block the polysulfides and have biomimetic cellular behavior for engulfing polysulfides. The cavity (∼6 Å) and functional groups of the supramolecular polymer can provide a dynamic structure for reversible adsorption of polysulfides while the conductive MWCNT-OH ensure fast electron transfer. The batteries with the modified separator exhibited excellent rate capacities (945.5 and 625.4 mA h g–1 at 2 C and 4 C rates, respectively). Especially, the high areal capacities of 5.86 and 7.2 mA h cm–2 achieved at S loadings of 4.5 and 6.0 mg cm–2 and good cycling stability after 200 cycles at 0.1 C can be obtained. This demonstrates a strategy of supramolecular polymer-grafted carbon for dynamic polysulfide adsorption toward advanced Li–S batteries.
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PubMed
高影响因子
Nano Energy
·
2021
·
IF 17.881
Tuo Zhao,Ying Yao,Yifei Yuan,Meiling Wang,Feng Wu,Khalil Amine,Jun Lu
The main bottleneck in the application of biomass-based carbon material in energy field is the development of an economical, nanoscale controllable and universal fabrication method . Herein, we demonstrate that a biomass-derived carbon consisting of loose carbon nanosphere clusters could serve as an ideal cathode material for high performance Li-O 2 batteries . The carbon nanomaterial can be prepared from both biomass derivatives and crude biomass by a low cost, facile and nanoscale controllable method. The open slit-shaped hierarchical pore structure endows the electrode sufficient active surface sites and mass transport channels that are not easily asphyxiated by the discharge products. The concentration of oxygenic groups and structure defects on the surface of obtained carbon materials is very low, which minimizes the side reactions associated with carbon decomposition. The unique pore structure and surface properties of the carbon electrode give rise to a superhigh specific capacity of 20,300 mA h g −1 and an extremely long cycle life which a cyclic capacity retention of 100% is maintained for 543 cycles with current density of 0.2 mA cm −2 at controlled discharge-charge depths of 500 mA h g −1 .
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Zhao Yang,Wangxi Fang,Zhenyi Wang,Ruolin Zhang,Yuzhang Zhu,Jian Jin
The wide application of lithium batteries in consumer electronics and electric vehicles bring about ever-rising demand of lithium resources globally. Nanofiltration (NF) membranes with high Mg 2+ /Li + selectivity could achieve highly efficient separation of lithium from natural brines, which provides a good alternative for steady lithium supply. In this work, we developed a dual-skin layer nanofiltration membrane comprised of a polyethylene-imine (PEI) layer grafted on a polyamide layer. The polyamide layer was prepared via interfacial polymerization to endow the NF membrane with sub-nm pores, while the PEI layer was grafted on the polyamide surface via amidation reaction to further equip the membrane with enhanced positive charge. With the synergistic effect of size sieving from the polyamide layer and electrostatic exclusion from the PEI layer, the dual-skin layer NF membrane exhibits a high rejection of 98.5% to MgCl 2 and a low rejection of 46.2% to LiCl, suggesting a high Mg 2+ /Li + selectivity. As using this dual-skin layer NF membrane for separating Li + from a simulated brine, a high Mg 2+ /Li + separation factor (S Mg , Li ) up to 33.4 was achieved, which is the highest value among the pressure-driven polymeric nanofiltration membranes reported so far.
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JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Yuan Deng,Jianyong Wei,Junlu Sun,Yanan Zhang,Lin Dong,Chong-Xin Shan
Mechanoluminescent materials that could convert mechanical energy into light energy have attracted increasing attention in recent years for their wide potential applications in stress sensing and imaging, structural damage monitoring, wearable illuminating devices, self-powered display, mechanical energy collection and conversion. However, their relatively low mechanoluminescence intensity greatly hinders the practical application. Here, we present a simple and effective strategy to enhance the mechanoluminescence performance of ZnS :Mn phosphor by Li ion co-doping. ZnS:Mn,Li phosphors of the hexagonal wurtzite structure have been prepared via high temperature solid phase sintering . The PL and ML intensity have been enhanced by 338% and 610% for samples obtained when 4 and 5 at. % Li is introduced in the precursor materials, respectively, in comparison with those without Li dopant . The photoluminescence lifetime of ZnS:Mn,Li decreases gradually, indicating the enhanced non-radiative energy transfer as the Li concentration increases. The electron paramagnetic resonance spectroscopy is carried out to investigate the changing tendency of the sulfur vacancy of samples with various Li-doping concentration. The mechanism for mechanoluminescence enhancement is supposed to be correlated with the increased sulfur vacancies by Li co-doping, which may facilitates the non-radiative energy transfer and thereby improve the luminescence properties of the samples. These findings provide a feasible strategy to enhance the mechanoluminescence performance of traditional ZnS derived phosphors, and may contribute to developing novel mechanoluminescence materials for practical applications.
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