SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Xianju Zhou,Qianyang Chang,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Faling Ling,Yongjie Wang,Jingfang Li,Zhen Wang,Xuecong Zhang
Light-emitting perovskite quantum dots (PeQDs) are extensively investigated owing to their evident merits. However, it is still a challenge to adjust their intrinsic emissions and enhance their thermal stability to achieve full-color highly emissive QD-based light-emitting diodes (QLEDs), especially blue QLEDs. Herein, we demonstrate an effective strategy to fundamentally stabilize the crystal structure of CsPbBr 3 QDs by codoping Na + and Cu 2+ ions, which are designed to substitute Cs + (A sites) and Pb 2+ (B sites), respectively. It is found out that the codoping metal ions have significantly improved the thermal stability and the optical properties of the QDs. 40% of the emission intensity can be remained after 8 thermal cycles (20–120 °C) for CsPbBr 3 : Na + /Cu 2+ QDs, whilst less than 10% is maintained for undoped CsPbBr 3 QDs. Accordingly, stable blue QLEDs are packed by CsPbBr 3 : Na + /Cu 2+ QDs. Strong electroluminescence with the maximum luminance of 7161 cd m −2 and low turn-on voltage of 2.4 V are realized. The CIE coordinates are tuned from green (0.10, 0.74) to blue (0.17, 0.25) via Na + and Cu 2+ codoping. The maximum external quantum efficiency (EQE max ) is obtained as 4.52% for PeLEDs based on codoped QDs. The proposed metal ions A and B sites dual substitution strategy guarantees PeQDs as an extremely promising prospect in potential applications as high-resolution displays and high-quality lightings.
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Jianhui Li,Bifei Li,Yi Hou,Johar Zeb,Qunhui Yuan,Wei Gan
It is not easy to in-situ probe the structural evolution in assembly systems in solutions. Determining the activation energy of the molecular processes in vesicle formation, which is important in revealing the mechanism in the transformation of vesicles, is also challenging. In this work, with the combined second harmonic generation (SHG) and two-photon fluorescence (TPF) techniques, we determined that the activation energies of the aggregation of micelles , the evolution of aggregated micelles to vesicles and the penetration of an anticancer drug (doxorubicin, DOX) on the surface of vesicles composed of DOX and a surfactant bis (2-ethylhexyl) sodium sulfosuccinate (AOT) were 48.6 kJ/mol, 49.4 kJ/mol and 20.5 kJ/mol, respectively. In addition, we investigated the effect of different types of salts on the self-assembly behavior of DOX and AOT molecules. It was observed that compared with Na + , Ca 2+ significantly reduced the activation energy in the transformation of aggregated micelles to vesicles at a much lower concentration, which indicated a strong association ability between Ca 2+ and AOT head group.
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Materials Today Energy
·
2020
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IF 5.604
C. Xu,J. Zhan,Z. Wang,X. Fang,J. Chen,F. Liang,H. Zhao,Y. Lei
Na–CO 2 batteries are prospective in energy storage and CO 2 recycling applications; development of a high-efficiency, low-cost electrocatalyst to promote CO 2 reduction and carbonate decomposition is extremely vital for practical Na–CO 2 batteries. Herein, a highly efficient cathode catalyst for rechargeable hybrid Na–CO 2 batteries is successfully synthesized by encapsulating highly dispersed Co/Co 9 S 8 nanoparticles into carbon skeletons, consisting of biomass-derived S, N-co-doped hierarchically porous carbon (Co/Co 9 S 8 @SNHC). The conductive and hierarchically porous framework structure of the Co/Co 9 S 8 @SNHC can not only accelerate electron transport , electrolyte infiltration , and CO 2 diffusion but also can inhibit overgrowth and agglomeration of Co/Co 9 S 8 nanoparticles and expose numerous high density of active sites, as well as offer sufficient space to store discharge products. Benefiting from the synergistic effect among S and N dopants , carbon defects, and Co/Co 9 S 8 nanoparticles in robust porous carbon structure, the hybrid Na–CO 2 batteries displayed a low charge overpotential (only ~0.32 V) at 0.2 mA/cm 2 and repeatedly charged and discharged over 200 cycles at 0.1 mA/cm 2 . Besides, an ultrahigh areal capacity of ~18.9 mAh/cm 2 was obtained at 0.5 mA/cm 2 , the highest value to date for Na–CO 2 batteries. Meanwhile, the hybrid Na–CO 2 battery charging from Na 2 CO 3 @C catalytic cathode demonstrated the high catalytic activity of biomass-derived S,N-co-doped hierarchically porous carbon (Co/Co 9 S 8 @SNHC) for CO 2 reduction and carbonate decomposition. Given this finding, this work might open up a potential avenue for the reasonable design of low-cost and highly efficient catalysts for advanced metal-CO 2 batteries systems.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zhao-Lei Huo,Jia-Yu Qiao,Le-Xi Zhang,Yao-Wen Yue,Qi-Da Qiu,Zhi-Jiang Hou,Jing Yin,Li-Jian Bie
Nowadays, attractive progress has been made on flexible humidity sensors for multifunctional applications, yet most of them still suffer from intrinsic instability due to the device structure based on flexible substrates. Herein, high-performance flexible humidity sensors were constructed using alkali metal halide doped polyvinylpyrrolidone (PVP)/polyvinylidene fluoride (PVDF) freestanding films. These films are prepared via a versatile thermally induced phase separation procedure with a network-like porous structure. After doping with metal salts of MCl (M = Li, Na, K), the humidity sensing performance is highly improved, among which the LiCl@PVP/PVDF film is the optimized one. In the relative humidity range of 11–97% at room temperature, the LiCl@PVP/PVDF sensor exhibits high response (2.3 × 103), fast response (10 s), small hysteresis (0.41%), and excellent repeatability. Notably, the LiCl@PVP/PVDF film is featured as fully self-supporting without the assistance of any substrate, readily tailorable that can be cut into different shapes, as well as highly flexible that can be bent to certain angles, and meanwhile almost maintains its response without significant decrease. Furthermore, the excellent performance enables the LiCl@PVP/PVDF sensor to demonstrate great potential in real-time noncontact diaper and finger detection. This contribution provides a practical humidity sensing candidate for moisture monitoring and gives insights into the fields of humidity sensors and flexible electronics.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jiahui Li,Boxuan Peng,Siyuan Yu,Fangzheng Zhao,Qiqi Han,Shuaibing Huang,Fengmin Jin,Jinfeng Xing
With the rapid development of industry, water pollution has become one of the important problems that harm the ecological environment and human health. The extensive use and random discharge of dyes have caused serious damage to water resources. Hydrogel bead is a promising material for dye adsorption due to its advantages of rich functional groups and high specific surface area. Here, acrylic acid sodium salt (AAS) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as monomers, N,N’-Methylene-bis-acrylamide (MBA) as crosslinking agent, sodium alginate (SA) as semi-interpenetrating network component, laponite as nano-clay additive, and single 2′,4′,5′,7′ −tetrabromofluorescein disodium salt (EY)/ Triethanolamine (TEOA)/ diphenyl iodonium hexafluorophosphate (DPI) as green light polymerization initiating system were combined to prepare composite hydrogel beads within 10 s under green LED irradiation. The composite hydrogels were characterized by infrared spectroscopy (FTIR), thermogravimetric analyzer (TG), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The addition of sodium alginate and laponite can improve the mechanical properties of hydrogel beads. In the adsorption study of malachite green, the influence of time, temperature, dye concentration, pH, ionic strength, and other factors on the adsorption effect were investigated. The adsorption process was consistent with the second-order kinetic process and Langmuir adsorption. At room temperature, the highest adsorption capacity of the hydrogel beads for malachite green reached 829.63 mg/g. The PAAS-SL hydrogel beads maintained a high adsorption effect in the pH range (3–10), and the capacity reached 575.0 mg /g at pH 3, which had a good ability to resist low pH. In the adsorption–desorption experiments, the removal rate of PAAS-SL hydrogel beads for MG is still more than 80 % after 5 cycles. Our research provides a promising strategy for the efficient and rapid preparation of hydrogel beads with excellent properties.
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高影响因子
Materials Today Sustainability
·
2024
·
IF 7.1
Sining Liu,Xin Yan,Pengyu Li,Xinru Tian,Sinan Li,Fei Teng,Shao-hua Luo
Li-rich Co-free Mn-based cathode materials have attracted considerable attention in the development of lithium-ion batteries (LIBs) due to their impressive theoretical capacity and cost-effectiveness. Nevertheless, the inherent shortcomings in cycling stability and rate capability hinder their widespread application. Herein, Na-doped Li 1.2-x Na x Mn 0.6 Ni 0.2 O 2 (x = 0, 0.01, 0.03, 0.05, 0.08, 0.10) is synthesized using Na 2 CO 3 as the source of Na. Density functional theory (DFT) calculations reveal that the presence of Na + introduction enlarges the between-layer spacing of Li 1.2 Mn 0.6 Ni 0.2 O 2 , reduces the band gap width, reduces the cation mixing phenomenon, and increases the Li + diffusion rate and electronic conductivity. Experimental electrochemical assessments demonstrate that the cathode material with a Na doping level of 0.03 exhibits remarkable performance: it achieves a discharge specific capacity of 204 mAh·g −1 at 0.1C and retains 87.4% of its capacity after 100 cycles. These findings underscore the efficacy of Na doping in enhancing the electrochemical properties of Li-rich Mn-based cathode materials, thereby advancing their potential for practical application in LIBs.
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高影响因子
Energy Storage Materials
·
2025
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IF 20.2
Yong Li,Qiming Xiao,Yun Zhao,Shu Zhao,Bin Liu
Alluaudite-type Na 2+2x Fe 2-2x (SO 4 ) 3 (NFS) compounds, as a promising polyanionic cathode material for sodium-ion batteries (SIBs), have attracted considerable attention owing to their cost-effectiveness and elevated operating voltage. Nevertheless, practical implementation of NFS has been hindered by inherent limitations including insufficient crystallinity and compromised electronic/ionic conductivity. Herein, we propose a pioneering dual-strategy integrating cation substitution with crystal engineering to synthesize Mg 2+ -doped single-crystalline NFS enveloped by flash graphene (denoted as [email protected] ). Through synchrotron radiation characterization complemented by density functional theory (DFT) simulations, we verified the preferential occupation of magnesium at the target iron site. Notably, while preserving the fundamental alluaudite framework, this strategic doping induced a band structure modulation with reduced bandgap and diminished Na⁺ diffusion barriers, synergistically enhancing charge transfer kinetics. The optimized [email protected] cathode delivers remarkable rate performance (63 mAh g -1 at 100C vs 21 mAh g -1 for the undoped counterpart) and unprecedented cyclability, retaining 92.8 % capacity after 7,000 cycles at 50C. In addition, the pillar effect of Mg 2+ in the crystal, as evidenced by in-situ XRD results, greatly inhibited the migration of Fe 3+ during cycling, maintaining the stable structure and resulting in outstanding cycling stability under drastic conditions. These findings establish a universal crystal engineering paradigm for developing high-performance polyanionic cathodes in energy storage systems.
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高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-12
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IF 16.6
Zhang Jiyu,Yan Yongliang,Wang Xin,Cui Yanyan,Zhang Zhengfeng,Wang Sen,Xie Zhengkun,Yan Pengfei,Chen Weihua
Non-aqueous sodium-ion batteries (SiBs) are a viable electrochemical energy storage system for grid storage. However, the practical development of SiBs is hindered mainly by the sluggish kinetics and interfacial instability of positive-electrode active materials, such as polyanion-type iron-based sulfates, at high voltage. Here, to circumvent these issues, we proposed the multiscale interface engineering of Na 2.26 Fe 1.87 (SO 4 ) 3 , where bulk heterostructure and exposed crystal plane were tuned to improve the Na-ion storage performance. Physicochemical characterizations and theoretical calculations suggested that the heterostructure of Na 6 Fe(SO 4 ) 4 phase facilitated ionic kinetics by densifying Na-ion migration channels and lowering energy barriers. The (11-2) plane of Na 2.26 Fe 1.87 (SO 4 ) 3 promoted the adsorption of the electrolyte solution ClO 4 − anions and fluoroethylene carbonate molecules, which formed an inorganic-rich Na-ion conductive interphase at the positive electrode. When tested in combination with a presodiated FeS/carbon-based negative electrode in laboratory- scale single-layer pouch cell configuration, the Na 2.26 Fe 1.87 (SO 4 ) 3 -based positive electrode enables an initial discharge capacity of about 83.9 mAh g −1 , an average cell discharge voltage of 2.35 V and a specific capacity retention of around 97% after 40 cycles at 24 mA g −1 and 25 °C.
研究领域:
电化学
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材料科学
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能量存储
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Xiang Li,Shengzhao Zhang,Wei Li,Xinhui Xia,Xiuli Wang,Changdong Gu,Jiangping Tu
Replacing organic liquid electrolytes with solid-state electrolytes (SSEs) can effectively improve safety in conventional rechargeable sodium ion batteries. Herein, a mono-comb poly(siloxane-g-ethylene oxide) fiber membrane is proposed to construct fast sodium ion channels for solid electrolyte based on electrospinning polyacrylonitrile (PAN) fiber and the polymerization reaction between polymethylhydrosiloxane (PMHS) and methoxypolyethylene glycols (MPEG). The fiber membrane exhibits a high room-temperature ionic conductivity of 1.06 mS cm −1 , an electrochemical stability window of 4.8 V, and outstanding thermal stability and mechanical strength. A rechargeable Na/Na 3 V 2 (PO 4 ) 3 solid-state full cell based on the polymer electrolyte membrane exhibits a high initial discharge capacity of 114.3 mAh g −1 at 0.2C and a discharge capacity retention of 86.5% after 1000 cycles at 1C. These advantages make the mono-comb poly(siloxane-g-ethylene oxide) fiber membrane have a good prospect in safety sodium ion batteries.
研究领域:
材料科学
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电化学
·
能源存储
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Qianqian Zhang,Yaru Zhu,Min Yang,Yanru Zhang,Jialin Wang,Shanshan Liu,Ye Liu,Xin Yang,Kai Feng,Wenzuo Li
Aqueous zinc-ion batteries (AZIBs) have good application prospects in the field of large-scale energy storage. The design and synthesis of high-performance cathode materials are key to promoting the development and application of AZIBs. In this work, the combination of redox active V 4+ cation and HPO 3 2− anion provides excellent zinc-ion (de)intercalation ability. In addition, HPO 3 2− and C 2 O 4 2− anion groups collaborate to construct a stable framework with multi-dimensional zinc-ion transport channels, providing fast and robust pathway for zinc-ion transport. Carbon composites further improve electronic conductivity, shorten ion transport distance, and increase the electrochemical reaction area of Na 2 [(VO) 2 (HPO 3 ) 2 (C 2 O 4 )]·2H 2 O@C (NVPCO@C) cathode material. As a result, NVPCO@C cathode material delivers a high specific capacity over 180 mAh·g −1 at a current density of 40 mA·g −1 . Moreover, NVPCO@30%C cathode material maintains 100 % capacity after 100 cycles. Ex-situ X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectra confirm the electrochemical activity of V 4+ /HPO 3 2− ions and reveal the zinc-ion storage mechanism.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yu Yan,Mengmeng Shang,Shuai Huang,Yining Wang,Yixin Sun,Peipei Dang,Jun Lin
Near-infrared (NIR) phosphors are fascinating photoluminescence materials with applications in phosphor-converted light-emitting diodes (pc-LEDs) for night vision lighting, which are still restricted by low efficiency and thermal stability in the current research stage. In this work, AScSi2O6 (A = Na/Li) are chosen as hosts due to a larger band gap and a single octahedral site for Cr3+ doping. The NIR-emitting Cr3+-activated AScSi2O6:Cr3+ phosphors were successfully prepared by a common high-temperature solid-state method. X-ray diffraction and Rietveld refinement confirm that the Cr3+ prefers to enter the Sc3+-octahedral lattice site in the AScSi2O6 structure. Under blue light excitation, AScSi2O6:Cr3+ phosphors exhibit broadband NIR emission from 700 to 1100 nm with a full width at half-maximum of ∼150 nm owing to the 4T2 → 4A2 electron transition of Cr3+. The photoluminescence properties were enhanced by adjusting the fluxes and sintering conditions, and highly efficient LiScSi2O6:Cr3+ NIR phosphors with external quantum efficiencies of 33.4% were obtained. Moreover, the optimized LiScSi2O6:Cr3+ exhibits excellent thermal stability (75% at 150 °C) with an activation energy of 0.33 eV. Importantly, the fabricated NIR pc-LED with the highly efficient LiScSi2O6:Cr3+ phosphor demonstrates brighter NIR light and a higher luminous efficacy than the NaScSi2O6:Cr3+ phosphor in night vision.
研究领域:
材料科学
·
光学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Xiaoli Luo,Wu Zhao,Qichen Chen,Mingfeng Zhi
As a matrix material, NaYbF 4 has attracted more and more attention due to its large absorption cross section and high energy transfer efficiency. In this study, lanthanide doped NaYbF 4 upconversion (UC) nano-/micro-crystalline was carefully synthesized by hydrothermal method . The influence of kinds of external conditions, including reaction time, initial reaction solution pH value, organic solvents codoping, and Na + concentration on crystalline phase, size, morphology and especially luminescent property are systematically studied and the possible formation mechanism based on PH values is emphatically proposed. The products of NaYbF 4 with various morphologies range from nanospheres , microprisms, microdisks, hexagonal crown-capped shapes, hexagonal clam-like shapes and hexagonal flower-like shapes were successfully prepared. The results show that the up-conversion luminescence property is positively correlated with the slenderness ratio. Solvents codoping and Na + concentration can greatly improve the luminescence property, especially for red emission. Impressively, the emission colors and intensities might be finely tuned through finely tuning the PH values, solvents co-doping and Na + dosage. Furthermore, this study will be expected to contribute to the synthesis of various morphologies and improving the UC intensity of lanthanide doped crystals.
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