COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yingying Jiang,Yue Wang,Xinghai Li,Jian Zhang,Kangyi Chen,Jianquan Liang,Li Zhao,Changsong Dai
Na 3 Mn 1−x Cr x Ti(PO 4 ) 3 /C composites with different chromium doping contents (x = 0.01, 0.03, 0.05, 0.07, 0.10, 0.12, 0.15), a potential cathode material in sodium-ion batteries with its classical 3D NASCION structure, has been synthesized via a feasible sol-gel route. The doping effects on the crystal structure were verified by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman and Fourier-infrared spectra (FT-IR). The results show that chromium doping does not alter the structure of the material, and chromium is successfully doped for manganese site. Proper chromium doped Na 3 Mn 1−x Cr x Ti(PO 4 ) 3 /C composites exhibit a high reversible capacity and structural stability . Among them, Na 3 Mn 0.93 Cr 0.07 Ti(PO 4 ) 3 /C and Na 3 Mn 0.90 Cr 0.10 Ti(PO 4 ) 3 /C achieve the highest capacity retention (90.19% after 100 cycles at 0.2 C) and initial discharge specific capacity (119.65 mA h g -1 at 0.2 C), yielding the coulombic efficiency of ~100%. Interestingly, even after cycling at 10 C over 500 cycles, the Na + -storage capacity of 94.37 and 101.51 mA h g -1 with a capacity retention of 79.70% and 73.74% were respectively still obtained with x = 0.07 and 0.10, highlighting their excellent long cycling life and remarkable rate performances. Results from the cyclic voltammetry and impedance spectroscopy studies were combined to verify the enhanced sodium-ion diffusion coefficients .
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·Vol. 43
·期 1
·99-105
·
IF 2.758
Zhi Zhou,Wei Luo,Hao Huang,Shengxiong Huang,Yongji Xia,Nan Zhou,Zhangxing He
In this paper, LiTi 2 (PO 4 ) 3 @carbon/graphene (LCG) hybrid was prepared and investigated as anode for aqueous lithium ion batteries (ALIBs). The as-prepared hybrid was characterized by XRD , SEM, TEM and TGA . The electrochemical performances of nano-structured materials as anode were evaluated by cyclic voltammetry , electrochemical impedance spectroscopy and charge-discharge tests. The cell using LCG as anode exhibits excellent cycling performance both at relatively low and high rates. The capacity retention of LCG can remain 87.6% at 0.2 C after 200 cycles and 77.2% at 5 C after 1000 cycles compared with LiTi 2 (PO 4 ) 3 @carbon (0.2 C: 71.8%, 5 C: 58.1%). Moreover, LCG reveals superior rate capability with 80.8 mA h g −1 , 62.1 mA h g −1 at 10 C and 20 C, respectively. The outstanding electrochemical performance of LCG comes from the improved electrical conductivity and the forming of efficient conductive network. The results demonstrate that the graphene-modified LiTi 2 (PO 4 ) 3 @carbon is a promising anode for ALIBs.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
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高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yaping You,Ya Zheng,Zesheng Pan,Yunluo Wang,Tianrui Zhou,Minghui Wang,Haijie Chen,Wan Jiang,Lianjun Wang
White light-emitting diode (WLED) has been widely used as solid-state lighting in recent years, with the advantages of energy saving, high luminous efficiency , and safety. Red phosphors are crucial to the color rendering index of WLED, and Eu 3+ -activated red phosphors can significantly improve the chromaticity performance of WLED. In this work, a series of new orange-red emitting BaLiZn 3 (PO 4 ) 3 : Eu 3+ phosphors were synthesized through high-temperature solid-state reaction method. The phase composition , crystal structure, morphology and photoluminescence properties of BaLiZn 3 (PO 4 ) 3 : Eu 3+ samples were investigated. The phosphors can be effectively excited by the violet light at 394 nm and emit orange-red lights corresponding to the electric dipole transition (5D 0 →7F 1 ) at 594 nm. The optimal doping concentration of Eu 3+ ions was about 5 mol%. The concentration quenching was caused by the electric dipole-dipole interaction between Eu 3+ ions. Temperature-dependent PL spectra indicate that BaLiZn 3 (PO 4 ) 3 : Eu 3+ has excellent emission and color stability at high temperatures. The color coordinates were calculated and fall in the orange-red luminescent area. The color purity is about 98.3 %, and the correlated color temperature is 1710K. These results indicate that the new orange-red phosphor BaLiZn 3 (PO 4 ) 3 : Eu 3+ has potential application prospects in WLED.
研究领域:
材料科学
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发光材料
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固体照明
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无机化学
·
光电子学
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Renping Cao,Caiping Chen,Fangrui Cheng,Ting Chen,Bang Lan,Lan Li,Ru Liu,Jing Wang
In this work, we synthesize Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Ca 3 Bi(PO 4 ) 3 :Eu 3+ , and Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ . The crystal structure, phase purity, and the luminescence properties of samples are investigated, respectively. Ca 3 Bi(PO 4 ) 3 :Dy 3+ under excitation at 350 nm shows yellow emission because of the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ . Ca 3 Bi(PO 4 ) 3 :Eu 3+ with excitation at 394 nm emits red-orange emission due to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Eu 3+ with excitation at 394 nm mainly shows the emission of Eu 3+ , however, that with excitation at 350 nm mainly derive from Dy 3+ ion. We investigate the effects of the ratio between Dy 3+ and Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ on the luminescence properties. The energy transfer from Dy 3+ to Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ is found. We analyze the luminous mechanism of samples by energy level diagrams of Dy 3+ and Eu 3+ ions. The results are helpful for the research of other Dy 3+ and Eu 3+ co-doped luminescence materials.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 3
·1270-1277
·
IF 3.049
Yufeng Zhang,Jie Xiong,Dingyi Shen,Wenpeng Xia,Jie Yu,Yanfei Zhang,Jun Yang,Shanshan Hu,Yuxin Wan,Haili Wen,Hang Ye,Yucan Liu
A series of color-tunable emitting Na3Sc2(PO4)3:Ce3+/Tb3+/Eu3+ (NSPO) phosphors were prepared by a combination of hydrothermal synthesis and low temperature calcination. The phase structure, photoluminescence and energy transfer properties of the samples were studied in detail. The tunable colors were obtained by co-doping the Tb3+ ions into the NSPO:Ce3+ or NSPO:Eu3+ phosphors with varying concentrations. Under UV excitation, the energy transfers from Tb3+ to Eu3+ in the NSPO host occurred mainly via a dipole–dipole mechanism, and the critical distances of the ion pairs (Rc) was calculated to be 17.94 Å by the quenching concentration method. And that, the emission colors of the NSPO:Tb3+,Eu3+ phosphors could be adjusted from green through yellow to red because of the energy transfer from Tb3+ to Eu3+. Based on its good photoluminescence properties and abundant emission colors, the NSPO:Ce3+/Tb3+/Eu3+ phosphors might be promising as potential candidates for solid-state lighting and display fields.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hong-bo Huang,Shao-hua Luo,Cai-ling Liu,Yue Yang,Yu-chun Zhai,Long-jiao Chang,Ming-qi Li
Na super ionic conductor (NASICON)-type Na 3 V 2 (PO 4 ) 3 (NVP) has been considered as a potential positive electrode material for sodium ion batteries (NIBs) owing to its high theoretical specific capacity. Nonetheless, the practical application of NVP is hindered by the intrinsically poor electronic conductivity. Herein, polydopamine-derived nitrogen-doped carbon-covered Na 3 V 2 (PO 4 ) 3 /C composites (NVP/C/NC) have been prepared through a self-polymerization of dopamine on the NVP/C surface and subsequent calcination at high temperature. The as-synthesized NVP/C/NC composite cathode exhibits a high initial reversible capacity (109.2 mAh/g at 0.2C), superior rate performance (87.2 mAh/g at a rate up to 20C), and excellent cycling capability (91.2% of the initial capacity is kept after 500 cycles at 2C) in NIBs. Furthermore, compared with NVP/C electrode, the NVP/C/NC electrode presents low resistance and high sodium ions diffusion coefficient . The good performance can be ascribed to the nitrogen-doped carbon layer in improving the electronic conductivity, shortening diffusion length of Na + ions and electrons, and relieving the volume changes of electrode materials. These preliminary results suggest that the as-obtained NVP/C/NC composite is a novel promising electrode material for low-cost sodium energy storage.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Zhijian Sun,Lei Liu,Yuxiao Lu,Guangyue Shi,Jiajun Li,Lei Ma,Jie Zhao,Hongli An
NASION-type Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) is prepared by a novel sol-gel method using low cost inorganic germanium (GeO 2 ) as the precursor. The composition and phase transformation during the heating of the LAGP precursors are analyzed using thermogravimetric-differential scanning calorimetry (TG-DSC) and X-ray diffraction (XRD). The structures and morphologies of the LAGP are characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the LAGP annealed at 900 ℃ is partially crystallized and consists of a large number of nanoscale grains surrounded by amorphous regions. The LAGP particles present an irregular morphology with a large size distribution over a range of 0.2–1 μm. In addition, ionic conductivities of the prepared LAGP first increase and then decrease with an increase in the sintering temperature and time. A high ionic conductivity (4.18 × 10 −4 Scm -1 ) with an activation energy of 0.30 eV are obtained for the LAGP sample sintered at 900 °C for 8 h.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Qin-Chao Wang,Zhaoquan Peng,Sha He,Hao Chen,Jinglong Du,Huilin Zang,Xiaoge Li,Xiuqin Zhan,Jie Han
Sodium superionic conductor NaTi 2 (PO 4 ) 3 has attracted significant interest as an anode material for sodium-ion batteries (SIBs). However, its practical application is hindered by its low inherent electrical conductivity, particularly at low temperatures. In this study, oxygen vacancies (V O ) were introduced into NaTi 2 (PO 4 ) 3 nanoribbons to enhance sodium storage performance at low temperatures. X-ray diffraction with Rietveld refinement, electron paramagnetic resonance, and X-ray photoelectron spectroscopy confirm that NaTi 2 (PO 4 ) 3 -2 nanoribbons (NTP-2) exhibit the richest V O concentration. These V O , which bridge TiO 6 octahedra and PO 4 tetrahedra, significantly enhance the antibonding interactions of Ti1–O2 and P1–O1 bonds, while stabilizing the bonding in NaTi 2 (PO 4 ) 3 . The energy barrier for Na + migration is reduced to 0.40 eV involving the V O . The optimized NTP-2 anode demonstrates superior low-temperature performance, maintaining a capacity of 106.1 mAh g −1 (about 96.1 % of its initial capacity) at −20 °C after 300 cycles. Additionally, the NTP-2 anode exhibits a moderate Na + diffusion coefficient of 1.47 × 10 –11 cm 2 s −1 at −20 °C. Furthermore, the Na 3 V 2 (PO 4 ) 3 //NTP-2 full cell retains a capacity of 64 mAh g −1 at −20 °C after 250 cycles, highlighting its potential for low-temperature applications. By integrating oxygen vacancies and nanoengineering, both electronic and ionic conductivities are significantly enhanced in NaTi 2 (PO 4 ) 3 , positioning promising applications for SIBs in low-temperature environments.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Peng-Xing Xie,Qing-Yuan Zhao,Haojie Dong,Tao Long,Meng-Sha Ding,Bin Xie,Xiao-Feng Wang,Wei Ling,Mengting Liu,Xiong-Wei Wu,Peng-Fei Wang,Xian-Xiang Zeng
Delivery of high energy density in polyanion compound-Na 3 V 2 (PO 4 ) 3 based on three-electron redox is still challenging because of their controversial multi-electron reaction mechanism and unsatisfactory electrochemical reversibility. Herein, the reversible V 4+ /V 5+ redox ( ca. 4.0 V) could be successfully activated in Na 4 VFe(PO 4 ) 3 cathode material through a Na-rich strategy, demonstrating a reversible specific capacity of 154.7mAh g −1 at 0.1C and 90.3mAh g −1 after 800 cycles at 20C, with 80 % of the initial capacity retained. The entire electrochemical reaction undergoes a highly recoverable phase transition by in-situ X-ray diffraction. Impressively, the Na-rich strategy could not only allow Na2 site to be occupied to activate the V 4+ /V 5+ redox pair confirmed by X-ray absorption near-edge structure spectroscopy, but also enable Na + transportation across the generated vacancies rather than synergistic Na + diffusion. This work provides rational design strategy of multi-electron transfer reaction in high-energy sodium-ion batteries.
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高影响因子
Metals
·
2024
·Vol. 14
·期 12
·1453
·
IF 2.6
Bo Pei,Xin Qiao,Que Huang,Changcheng Liu,Mengna Shi,Xiaomei Jiang,Feng Li,Li Guo
Na3V2(PO4)3(NVP) is considered to be a promising cathode material for sodium-ion batteries (SIBs). Ion doping can effectively improve its structural deformation, poor conductivity, and electrochemical performance. However, the research on the effect of ion doping on the thermal stability of NVP is still limited. In this paper, Mg/Ti co-doped and Mn/Ti co-doped modified NVP with carbon nanotubes (CNTs) (MgTi@ CNTs and MnTi@CNTs) were prepared, respectively, and X-ray diffraction (XRD) results proved that MgTi@CNTs and MnTi@CNTs have good structural stability and crystallinity. The electrochemical performance indicates that the dual strategy ofp-n-type co-doping and CNT coating provides superior sodium storage performance, enhancing both electronic conductivity and ion diffusion. Secondly, based on the safety point of view, the thermal stability ofp-n-type ion-doped NVP and its mixed system with electrolyte in a charged state was studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and accelerated calorimeter (ARC). The results show that the optimized MgTi@CNTs and MnTi@CNTs electrodes exhibit excellent thermal stability in the absence of electrolytes, indicating their high intrinsic safety. However, it is worth noting that in the electrode/electrolyte system,p-n-type ion-doped NVP have higher reactivity with the electrolyte, and their comprehensive thermal safety is lower than that of NVP. Therefore, in practical applications, it is necessary to comprehensively consider the thermal stability of the material and the thermal safety of its mixed system with the electrolyte. This paper provides a data basis for the practical application of NVP in SIBs.
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高影响因子
INTEGRATED FERROELECTRICS
·
2021
·
IF 0.836
Ji Yan,Zhen Li,Xiao-Kai Ma,Xin-Bo Chang,Fu-Jun Liu,Yong Zhang,Li-Zhen Wang
NASICON Na3V2(PO4)3 was investigated as cathode material in hybrid ion batteries using Li as counter and LiPF6 as electrolyte. The highly efficient and homogeneous heating merits of microwave irradiation facilitates the Na3V2(PO4)3 achieving excellent crystal structure, uniform carbon coating, as well as ideal particle size. After microwave irradiation, a specific capacity of 96.5 mAh g−1 is obtained for the first intercalation of lithium ion into Na3V2(PO4)3 at 0.1 C rate. For long-term cycling stability, the capacity retention reaches 84.4% at 5 C rate after 500 cycles. The unique intercalation/extraction characteristic promises Na3V2(PO4)3 an ideal candidate material for next-generation hybrid ion storage system.
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高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Dongjia Li,Bo Xiao,Xinyi Dai,Chao Wang,Yawei Wei,Haijun Chen,Yi Mai,Fuzhong Wu,Jiexi Wang
Amid the fast growth of lithium-ion batteries, LiNi 0.5 Mn 1.5 O 4 (LNMO) with a 4.7 V working voltage and cost advantages has gained significant attention. The instability of LNMO structure during high-voltage cycling leads to significant side reactions with the electrolyte, hindering its commercial development. Our study introduces a co-crystallization calcination strategy to enhance the optimization of LNMO. This study utilized a straightforward wet chemistry approach to combine the precursor of NASICON-type solid electrolyte Mg 0.5 Ti 2 (PO 4 ) 3 (MTP) with the precursor of LNMO. Subsequently, a MTP coating was formed in-situ on the surface of LNMO through a single-step calcination process. Co-crystallization and calcination processes limit LNMO particle secondary growth, shorten Li + diffusion path , achieve Mg 2+ and Ti 4+ co-doping, enhance structural stability , and result in triple modification, leading to a significant improvement in electrochemical performance . Among them, LNMO with a 1 % molar ratio modified by MTP reaches 81.7 % of the initial capacity after 500 cycles at room temperature and 84.3 % after 180 cycles at 55 °C. Under identical conditions, unmodified samples have 39.3 % and 76.3 %, respectively. Our research explores a novel application of NASICON-type solid electrolytes in modifying LNMO cathode material .
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