JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yu Duan,Zi-han Ma,Ying-ying Huang,Shuo Bao,Jin-lin Lu
Oxides with a layered structure are regarded as prospective candidates for use as cathodes in the next generation of sodium ion batteries . These materials, which exhibit a P2 structure and O3 structure, possess distinctive advantages that give rise to disparate electrochemical performance . Herein, a thermodynamically and kinetically stable P2/O3 biphasic layered oxide with a chemical formula of K 0.05 Na 0.8 Ni 0.5 Mn 0.5 O 2 is synthesized using a simplistic high temperature solid-state method. P2 phase enhances the structural stability of the material, while O3 phase provides additional sodium storage sites, thereby increasing the material’s capacity. The joint action of the two phases results in an improvement in the electrochemical characteristics. Moreover, the Ni-Mn-based layered oxide is enhanced by Fe-substitution, which effectively mitigates the Jahn-Teller effect caused by Mn 3+ , thereby improving the comprehensive electrochemical performance of the cathode. The Fe-doped specimen offers 102.8 mAh g −1 as the initial reversible discharge capacity under a high current density of 200 mA g −1 , and a high capacity retention amounting to 83.17 % is attained after 200 cycles. In addition, the structural development of the P2/O3 biphasic sample during Na + extraction/insertion was elucidated by in situ XRD . This paper employs the advantages of P2 and O3 phases to augment material electrochemical characteristics and verifies the possibility of the P2/O3 biphasic structure by density functional theory (DFT) calculations, providing new ideas for biphasic sodium ion battery cathode materials .
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaowei Li,Xing Shen,Junmei Zhao,Yang Yang,Qiangqiang Zhang,Feixiang Ding,Miao Han,Chunliu Xu,Chao Yang,Huizhou Liu,Yong-Sheng Hu
Na-ion batteries (NIBs) have been considered as potential candidates for large-scale energy storage, where O3-type Na-based layered oxide cathodes have attracted great attention due to their high capacity and low cost. However, O3-NaxTMO2 materials still suffer from insufficient air stability, which could lead to deteriorative electrochemical properties and thus hinder their practical application. In this work, a series of Al-doped O3-NaFe(1/3–x)Ni1/3Mn1/3AlxO2 cathodes prepared by a co-precipitation method were investigated to enhance their electrochemical performance and air stability through stabilizing their structural and interface chemical properties. The Al-doped O3-NaFe(1/3–0.01)Ni1/3Mn1/3Al0.01O2 (NFNMA0.01) cathode delivers a comparable capacity of 138 mAh g–1 and keeps a capacity retention of 85.88% after 50 cycles at 0.2 C, while the undoped O3-NaFe1/3Ni1/3Mn1/3O2 (NFNM) can only keep a capacity retention of 71.02%, although with an initial capacity of 141 mAh g–1 at 0.2 C. For the air stability, the capacity decay rates are 58.87 and 5.07% for the undoped NFNM and Al-doped NFNMA0.01 after the air exposure for 30 days, respectively. The greatly decaying electrochemical performance could be due to the formation of carbonates during air exposure, which can be efficiently suppressed by Al doping. The doped Al3+ has been confirmed to be inserted into the NFNM crystal lattice, inducing the reduced values of lattice parameters a and c due to the smaller ionic radius of Al3+ (53.5 pm) vs Fe3+ (55.0 pm). This study demonstrates that Al doping plays an important role in the air stability and cycling stability for layered cathode materials, which offers an efficient strategy to optimize the material design for their practical application in NIBs.
研究领域:
储能
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材料科学
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电化学
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12599-12608
·
IF 10.7
Yiming Yang,Jiachen Lu,Xinyu Zhang,Yanuo Shi,Peng Du,Xiao Ling,Nan Yang,Qianli Chen
Y-doped Ba(Zr,Ce)O3 (BZCY) proton conducting ceramics have attracted extensive attention because of their promising applications as electrolytes for intermediate-temperature proton ceramic electrochemical cells. The proton conductivity of BZCY is governed by their lattice volume and crystal symmetry; however, systematic studies of the competition between these two factors are lacking, hindering further improvement of their proton conductivity at low and intermediate temperatures. In this work, the crystal symmetry of BZCY epitaxial films deposited on NdGaO3 (110) is compared to that of polycrystalline bulk BZCY based on Raman spectra. The Raman signal of BZCY epitaxial films is amplified using surface-enhanced Raman spectroscopy and subsequently extracted utilizing the nonnegative matrix factorization method. The relative Raman intensity ratio of the BO6 octahedra motion to the Ba-BO6 relative motion in the ABO3 structure indicates that as the Ce content increases, the crystal symmetry of polycrystalline bulk BZCY decreases, whereas that of the epitaxial films on NdGaO3 remains consistently lower compared to bulk BZCY. The relationship between the activation energy and relative Raman intensity of epitaxial films and bulk BZCY indicates quantitatively that higher activation energy is observed in the crystal structure with lower symmetry. This work suggests that crystal symmetry has a predominant effect on the activation energy of BZCY. The results provide a deeper insight for developing proton conducting electrolyte membranes with high proton conductivity and low activation energy.
研究领域:
材料科学
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固体离子学
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光谱学
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能源材料
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陶瓷电解质
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuyu Liu,Wenye Deng,Xianghui Chen,Yan Xue,Xuelian Bai,Pengjun Zhao,Huimin Zhang,Aimin Chang,Yongxin Xie
The perovskite CaMn x Zr (1- x ) O 3 ( x = 0, 0.05, 0.10, 0.15) (CMZO) NTC (Negative Thermal Coefficient) thermo-sensitive ceramic were prepared by the solid phase method that can be used as high temperature thermistor materials in the range of 200–1200 °C.The XRD pattern showed that CMZO is a finite solid solution and that a second phase, CaMnO 3 , will be formed after exceeding the solid solution limit (i.e., at x = 0.1). The thermal constant B value was found to decrease from 19521 K to 9217–9535 K, with a corresponding decrease in activation energy , E a , from 1.69 eV to 0.82 eV. The Nyquist plot indicates that the grain boundary resistance determines the overall complex impedance. Moreover, the aging drift rate (ΔR/R 0 ) was found to be lower than 4.3%, which is an indication of an excellent high temperature stability of the CMZO ceramic material.
研究领域:
材料科学
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无机非金属材料
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热敏材料
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高温电子器件
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功能陶瓷
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tengfei Yu,Rongrong Chen,Xiang Ji,Zhijun Fu,Subing Jiang,Meizhen Gao
In this study, we investigated the phase structure, Curie temperature, dielectric properties, piezoelectricity, and energy-storage properties of BiFeO 3 (BFO)-modified (Ba 0.95 Ca 0.05 ) (Ti 0.89 Sn 0.11 )O 3 (BCTSO) ceramics using both experimental and theoretical methods. The results indicated that the lattice distortion and chaotic distribution of the local charge increased with the BFO content, resulting in a phase transition and transformation from a ferroelectric to a relaxing ferroelectric. First-principles calculations revealed that the Curie temperature decreased with increasing BFO content, primarily because of an increase in the ground state energy. The variation in the permittivity of the BCTSO- x BFO ceramics with temperature and frequency is affected by the phase structure and Maxwell-Wagner interface polarisation, respectively. The electrical modulus measurements indicated that BCTSO- x BFO exhibited non-Debye-type dielectric relaxation for x = 0.0, 0.1, and 0.5 %, whereas BCTSO- x BFO showed Debye-type dielectric relaxation for x = 0.9%.
研究领域:
材料科学
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物理学
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DOI
高影响因子
Journal of Advanced Dielectrics
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2018
·
IF 0
Jiang Li,Dan-Dan Li,Biao Lu,Ying-Bang Yao,Tao Tao,Bo Liang,Wen-Hui Lu,Ge-Li Luo,Sheng-Guo Lu
The electrocaloric effect (ECE) in lead-free BaSn x Ti 1 − x O 3 (BSnT, x = 0 . 0 5 , 0.10 and 0.15) ceramics were investigated using a direct ECE measurement. Results indicate that the maximum ECE occurs near the Curie temperature and it slightly shifts towards high temperatures. The directly measured ECE is larger than that calculated using the Maxwell relation and P-E loops. A maximum electrocaloric efficiency Δ T ∕ Δ E = 0 . 4 9 × 1 0 − 6 KmV − 1 was procured for the composition with x = 0 . 1 5 at T = 2 9 9 . 2 K. And it also shows a broad peak in the temperature range of 250–320 K.
研究领域:
材料科学
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物理学
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DOI
Journal of Energy Storage
·
2026
·
IF 10.7
Yuqi Meng,Yiqi Guo,Yong Ji,Rui Wang,Gaoqiang Mao,Qinghua Tian,Hui Tong,Wanjing Yu,Shuo Yin
O3-type NaNi 1/3 Fe 1/3 Mn 1/3 O 2 represents a highly promising cathode candidate for sodium-ion batteries, offering a combination of competitive cost and impressive capacity characteristics. However, its development faces challenges such as irreversible structural phase transitions and sluggish Na + transport kinetics. Herein, a trace substitution of Sr 2+ at Na sites was employed to enhance the structural stability of NaNi 1/3 Fe 1/3 Mn 1/3 O 2 via a facile solid-phase sintering method. Comprehensive characterization confirmed that Sr 2+ preferentially occupied the position of sodium sites due to favorable ionic radius matching. The larger ionic radius of Sr 2+ effectively facilitated expansion of the interlayer spacing, which weakened the Na + -O 2− electrostatic attraction and thereby boosted Na + transport. Simultaneously, the formed SrO 6 octahedra with strong Sr O bonds acted as pillar units within the framework that could enhance structural integrity and suppress phase transitions and microcrack initiation. Consequently, the optimized cathode material exhibited an exceptional cycling durability with 79.3% capacity retention over 200 cycles at 1C, and demonstrated excellent rate capability of 107.9 mAh g −1 at 5C. The full cells with hard carbon achieved an energy density of 360.2 Wh kg −1 (calculated based on the mass of the cathode active material) with a capacity of 86.5% maintained after 100 cycles at 1C. This study elucidates the role of Sr as a pillar-type dopant in stabilizing O3-type cathode structures and proposes a viable strategy for enhancing the performance of layered oxide cathodes.
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产品关联
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高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.2
Guoliang Liu,Xuejiao Zhao,Lihan Zhang,Xiaoqi Wang,Manling Sui,Pengfei Yan
Layered O3–NaNi1/3Fe1/3Mn1/3O2 (NMF) is a promising cathode material for commercialization of sodium-ion batteries (SIBs), but it still faces challenges due to its poor cycling stability and air instability. Herein, we demonstrate that through optimized synthesis conditions (sintering and composition), a single Ca-dopant additive can synergistically achieve bulk-doping and surface-modification effects. Microscopic characterizations reveal that a robust rock-salt structure is constructed on the non-(003) surface facets due to Ca surface enrichment, which is developed through the Ca dopant exsolution process during high-temperature sintering. Combining bulk-doping and surface-modification effects, the 3% Ca-doped NFM cathode demonstrates superb cycling stability and improved rate capability, boosting the capacity retention from 61.4% to 90.5% after 200 cycles at 2.0–4.0 V. Further microanalysis reveals that the surface Ca-enriched modification layer not only effectively suppresses the cycling-induced surface degradation but also significantly improves the air storage stability by acting as a physical barrier layer to prevent moisture degradation. This work offers a new pathway to achieve bulk and surface modifications by a simple doping strategy and reveals the dual effects of Ca-doping for enhanced performance of O3-type layered oxide cathodes.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xinying Zhu,Mingchen Mei,Dingxin Wang,Song Liu,Rui Liu,Xi Kong,Letao Yang,Houbing Huang
Ceramic capacitors with stable dielectric responses at elevated temperatures are of great importance for advanced electronic applications. In this study, high-entropy-engineered (Ba 0.85 Sr 0.15 )TiO 3 –Bi(Mg 2/3 Ta 1/3 )O 3 solid solutions were developed to achieve broad-temperature dielectric stability. Among them, the composition with 25% and 30% Bi(Mg 2/3 Ta 1/3 )O 3 exhibit excellent dielectric properties, exhibiting room-temperature relative dielectric constants of 663 and 680, and dielectric losses of 0.6% and 1.1%, respectively. Particularly, they meet the X9R and X10R specification and dielectric loss of ∼0.6%, with capacitance variation less than ±15% from −74 °C to 265 °C, satisfying the X9R. The composition with 30% Bi(Mg 2/3 Ta 1/3 )O 3 shows the room-temperature dielectric constant of ∼680 and the dielectric loss of ∼1.1%, and showing TCC values within ±15% from −60 °C to 300 °C, which meets the X10R requirement. The improved dielectric temperature stability is associated with high-entropy-induced relaxor behavior together with enhanced high-temperature insulation characteristics, which jointly suppress dielectric loss and leakage current over a broad temperature range. These results demonstrate that high-entropy design is an effective route for developing high-performance temperature-stable dielectric materials for high-temperature capacitor applications.
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DOI
高影响因子
Collagen and Leather
·
2025
·Vol. 7
·期 1
·1-13
·
IF 9.2
Cai Zhenpeng,Xiang Yujia,Cong Boyi,Liu Yang,Yang Shuai,Wang Ningruo,Zhang Heng,Wang Yuzhong,Lai Bo
Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) is commonly used as a preservative and fungicide in leather production that leads to its presence in tannery wastewater. As a typical organic phosphorus pollutant, THPS poses potential threats to both the ecological environment and human health. Herein, this investigation used the microscale zero-valent iron (mZVI)/O3 process to eliminate THPS from aquatic environments. The mZVI/O3 system demonstrated superior removal performance, achieving high removal efficiencies of total phosphorus (TP), organic phosphorus (OP), and chemical oxygen demand (COD) compared to traditional systems (i.e., mZVI alone, O3 alone, Fe2+/O3, and Fe3+/O3). Moreover, batch experiments were conducted to optimize the key operational parameters (such as initial pH, mZVI dosage, O3 concentration, and stirring rate). The TP, OP, and COD removal efficiencies in the mZVI/O3 system reached 97.10%, 97.31%, and 81.56% within 20 min, respectively, under optimized conditions. Based on the experimental results and characterization analysis, the THPS degradation mechanism by the mZVI/O3 system was primarily a combination of oxidation (60.37% ± 7.41%) and flocculation (39.63% ± 7.41%). Furthermore, the mZVI/O3 system demonstrated unprecedented removal performance in various actual wastewater samples. The system eliminated organic pollutants and improved biodegradability of actual wastewater. This study not only establishes the mZVI/O3 process as a robust, cost-effective, and environmentally sound approach for OP degradation but also offers substantial promise for practical wastewater treatment applications.
研究领域:
环境科学
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化学工程
·
水污染控制
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Mengfan Bao,Shijie Chen,Hongxiang Xie,Cuihong Zheng,Juan Chen,Aiqin Mao,Saisai Li
Transition-metal-based high-entropy oxides (HEOs) have gained significant attention as advanced anode materials for lithium-ion batteries (LIBs) owing to their compositional flexibility and entropy-driven structural stabilization. However, the low intrinsic conductivity and unsatisfactory rate capability remain largely unresolved. Herein, a unique hollow/mesoporous La(Cr 0.2 Fe 0.2 Co 0.2 Ni 0.2 Mn 0.2 )O 3 HEO is developed through an innovative sacrificial template-assisted solution combustion synthesis. As expected, the as-synthesized HEO exhibits a hollow/mesoporous spherical structure with a 49.0 m 2 g -1 surface area and 60.2% surface oxygen vacancy concentration, synergistically facilitating the electronic/ionic transport kinetics and structural stability, and demonstrating an interfacial charge storage mechanism. Benefiting from these combined properties, the engineered hollow/mesoporous HEO anode demonstrates superior rate capability (281 mAh g -1 at 3000 mA g -1 , ∼59% retention of its initial 475 mAh g -1 at 100 mA g -1 ), while maintaining unprecedented cycling stability with 1288 mAh g -1 after 250 cycles at 200 mA g -1 and 1246 mAh g -1 even after 900 cycles at 1000 mA g -1 with continuous capacity enhancement during prolonged cycling. This study establishes a paradigm for enhancing high-rate capabilities in HEO-based anodes through rational morphological design, providing new insights into structure-performance relationships for next-generation LIB applications.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-8
·
IF 2.8
Hu Zhilong,Liu Hongbo,Tang Jian Guo,Lee Soo Wohn,Li Jun
NaNbO 3 (NN) has potential applications in energy storage devices due to its antiferroelectricity and environmentally friendly characteristics, but its low dielectric breakdown field strength ( E b ) and energy storage efficiency ( ƞ ) limit practical applications. In this study, the structure and electrical characteristics of NaNbO 3 were modulated by introducing Sr(Mg 1/3 Nb 2/3 )O 3 (SMN) to optimize its energy storage performance. The (1- x )NN- x SMN solid solution was synthesized using a classic solid-state reaction approach. According to X-ray diffraction analysis results, the prepared ceramics exhibit a pure phase when x is less than or equal to 0.15. With the increment of x , SMN disturbs the long-range polar order, induces pronounced relaxation ferroelectric phase (RFE) with reduced remnant polarization ( P r ), and enhances E b , leading to significant increases in recoverable energy storage density ( W rec ) and η . The optimized composition 0.875NN-0.125SMN has the best dielectric energy storage properties with a W rec of 1.28 J/cm 3 and an η of 88%.
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产品关联
DOI
高影响因子
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