JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ruifeng Wu,Zhilong Fu,Yafei Liu,Yaxin Wei,Hao Sun,Aimin Chang,Bo Zhang
The entropy engineering strategy has been used for the first time to improve the grain boundary (GB) barrier of CaCu 3 Ti 4 O 12 (CCTO) ceramics, in order to solve its nonlinear problem at around 300 ℃ and expand its application in the field of high-temperature thermistors . To achieve this goal, we prepared (CaBaEuZnSr) 0.2 Cu 3 Ti 4 O 12 (CBEZSCT) high-entropy ceramics, and the GB spontaneous segregation properties were exploited to improve the GB resistance of CBEZSCT ceramics. The results show that the GB activation energy of CBEZSCT high-entropy ceramics (0.87 eV) is higher than that of CCTO ceramics (0.7 eV), which linearizes the resistance temperature curve and extends the application temperature limit from 300° to 750 °C. The proposed method of using a high entropy strategy to tune the GB resistance of CCTO to optimize its performance is highly effective, thus providing a new way of thinking about studying high-performance CCTO materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yao Yang,Jianqiang Bi,Linjing Qiao,Guandong Liang,Shuyong Liang,Shushuai Liu,Shaoyin Wang,Hongyu Gong,Zhao Qian,Jinwang Shi,Weiqiang Li
The properties of molybdenum diboride are intricately tied to its crystal structure, which includes two distinct phases, α-MoB 2 and β-MoB 2 . The α-MoB 2 exhibits superior electrical and catalytic properties, akin to those of graphite due to the similar HCP structure. Nevertheless, the transformation between α-MoB 2 and β-MoB 2 is complicated and the formation of α-MoB 2 remains challenge due to higher Gibbs free energy. The MoB 2 powder synthesized through boro/carbothermal reduction in this study suggests the β phase, transforming into α-MoB 2 completely via a high-entropy strategy. It founds that the introduction of high-entropy diborides (HEB) effectively inhibits the grain growth of samples, resulting in a significant enhancement in their hardness. The potential for the formation of a single-phase between MoB 2 and HEB is associated with Pauling electronegativity difference, δ χP . Furthermore, the formation of a single-phase solid solution was found to contribute to the improvement in the fracture toughness of the samples. This work presents a novel strategy for stabilizing α-MoB 2 , offering valuable insights into understanding phase-transition behavior in MoB 2 and the solid solubility in multi-component ceramics.
研究领域:
材料科学
·
固体力学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 32
·12389-12396
·
IF 5.7
Yunfei Wang,Hao Sun,Yang Zhou,Ruifeng Wu,Yafei Liu,Lili Zhi,Aimin Chang,Bo Zhang
LaCrO3-based ceramics are crucial for fabricating low temperature thermistors due to their unique physical and chemical properties. However, challenges such as nonlinear electrical behaviors (temperature dependence of the resistivity deviates from the Arrhenius equation), and insufficient stability limit their application in precise temperature sensing and control. Here, we propose a high entropy strategy to design novel thermistor ceramics (La0.2Nd0.2Sm0.2Gd0.2Y0.2)CrO3−δ, which results in a widening band gap and increasing lattice distortion. These modifications lead to a significant rise in resistivity and a good linear temperature dependence of the resistivity, along with a reduced thermal hysteresis effect. The results reveal that high entropy modification crucially contributes to the improved thermal and electrical performance of LaCrO3 ceramics due to pronounced lattice distortion and band gap expansion. This study underscores the significance of entropy induced microstructural modifications, thus establishing a novel paradigm for tailoring the electronic properties of LaCrO3-based ceramics and expanding the horizons of material science in thermal sensing technologies.
研究领域:
材料科学
·
热敏电阻技术
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Kaiteng Wang,Jun Zhou,Xiaoyu Deng,Shuo Wu,Ji Wu,Yuan Gao,Ke Deng,Jiaxi Niu,Lei Fu,Kai Wu
Perovskite oxide catalysts are gaining increasing attention for alkaline oxygen evolution reaction (OER) because of their stable crystal structures and inexpensive raw material sources. However, the low conductivity and the low intrinsic catalytic activity in perovskite oxides limit their performance in alkaline OER. Herein, we develop an acid-etched La 0.7 Sr 0.3 Ni 0.2 Co 0.2 Mn 0.2 Fe 0.2 Ru 0.2 O 3-δ perovskite oxide (H + -LSE x O) catalyst based on high entropy strategy and acid treatment engineering. Experimental characterization results indicate that the molar ratio of A-site atoms to B-site atoms (A/B) decreased significantly due to the partial inactive Sr atoms in H + -LSE x O are etched away. Electrochemical testing indicates that the current density of H + -LSE x O can reach 10 mA cm −2 only at an overpotential of 270 mV, which is comparable to the performance of the currently reported highly active OER catalysts (La 0.75 Eu 0.25 FeO 3 mesoporous nanosheets, Ni and Nd co-doped Co 3 O 4 spinel nanosheets). This work emphasizes the synergistic effect of acid treatment engineering to promote the exposure of B-site active sites and high-entropy strategy to regulate the electronic structure of B-site atoms in optimizing the OER performance of perovskite oxides.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hao Sun,Yunfei Wang,Yafei Liu,Ruifeng Wu,Aimin Chang,Pengjun Zhao,Bo Zhang
Next-generation high-temperature applications increasingly rely heavily on advanced thermistor materials with enhanced thermal stability and electrical performance. However, thus far, the great challenge of realizing high thermal stability and precision in a wide temperature range has become a key bottleneck restricting the high-temperature application. Here, we propose a high-entropy strategy to design novel high-temperature thermistor ceramics (La0.2Ce0.2Nd0.2Sm0.2Eu0.2)NbO4. Differences in atomic size, mass, and electronegativity in this high-entropy system cause high lattice distortion, substantial grain boundaries, and high dislocation density. These enhance the charge carrier transport and reduce the grain boundary resistance, thus synergistically broadening the temperature range. Our samples maintain high precision and thermal stability over a wide temperature range from room temperature to 1523 K (ΔT = 1250 K) with an aging value as low as 0.42% after 1000 h at 1173 K, showing breakthrough progress in high-temperature thermistor ceramics. This study establishes an effective approach to enhancing the performance of high-temperature thermistor materials through high-entropy strategies.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xiangyu Wang,Tingbo Zhang,Jiawen Fan,Tong Wei,Cai Ning,Yingdong Han,Liwei Wu,Jiao Cui
The security monitoring of valuables is a crucial concern to ensure the stable development of human social business activities, scientific research, production, and daily life. The implementation of security precautions has traditionally involved the mere placement of items in safes. However, the formidable task of ascertaining whether valuables have been compromised during storage remains a significant challenge. Photochromic materials are important intelligent substances that can be employed as a potential candidates for security monitoring. However, previous studies have predominantly focused on achieving prominent photochromism by utilizing specific light sources such as ultraviolet, laser, and X-ray radiation. In light of these existing challenges, a design strategy engaging high entropy is proposed to improve the photochromic performance. By selecting a diverse range of volatile metal elements, the A-site high entropy is realized within the ABO 3 perovskite structure, enabling the construction of various defects. This results in the successful realization of the material's sensitive response to sunlight, thereby validating the feasibility of the photochromism boosted by a high entropy strategy. The developed photochromic materials for intrusion indication demonstrate the capability to operate autonomously, making it a crucial component in high-level security monitoring systems and presenting a novel approach toward enhancing security protection in traditional domains.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yafei Liu,Ruifeng Wu,Hao Sun,Aimin Chang,Jing Guo,Bo Zhang
Next-generation advanced high-temperature sensors rely heavily on negative temperature coefficient thermosensitive ceramics with low cost, small volume, high sensitivity, and fast response. However, thus far, the enormous challenge of achieving ultrahigh stability and accuracy has become a critical bottleneck restricting the development of thermosensitive ceramics in high-temperature sensor applications. Here, we propose a high-entropy strategy to design a “cation valence self-equilibrium” system in CeNbO4+δ-based ceramics introducing redox couple compensation and ultrahigh density dislocations to solve the problem of temperature-dependent oxygen nonstoichiometry that restricts the performances of high-temperature thermosensitive ceramics. Ferroelastic domains are generated by enhancing the configurational entropy at both A and B sites, resulting in a dramatic increase of dislocation density to >1010 mm–2, which ultimately optimizes the thermosensitive performances. Extreme temperature measurement accuracy with R2 as high as 999.98‰ and RSS as low as 0.011 and high-temperature stability with ΔR/R0 as low as 0.23% after aging at 873 K for 1000 h are realized in high-entropy CeNbO4+δ-based ceramics, indicating a breakthrough in the comprehensive performances of thermosensitive ceramics. This work opens up an effective way to design thermosensitive materials with ultrahigh comprehensive performance to meet the requirements of advanced high-temperature sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Haotian Yan,Dandan Chai,Xiang Li,Yongzhu Fu
O3-type cathodes with sufficient Na content are considered as promising candidates for sodium-ion batteries (SIBs). However, these cathodes suffer from insufficient utilization of the active elements, restraining the delivered capacity. In this work, a high entropy strategy is applied to a typical O3 cathode NaLi 0.1 Ni 0.35 Mn 0.55 O 2 (NLNM), forming a high entropy oxide NaLi 0.1 Ni 0.15 Cu 0.1 Mg 0.1 Ti 0.2 Mn 0.35 O 2 (Na-HE). Results show that the active elements are fully exploited in Na-HE, with a two-electron reaction by Ni 2+/4+ (further extended to Cu redox and even oxygen redox), vastly different from a one-electron reaction of Ni 2+/3+ in NLNM. The full utilization of the active elements dramatically improves the output capacity of the cathode (122.6 mAh g −1 of Na-HE versus 81 mAh g −1 of NLNM). Moreover, the detrimental phase transition is well suppressed in Na-HE. The cathode exhibits high capacity retention of 88.7% after 100 cycles at 130 mA g −1 , compared to only 36.4% for NLNM. These findings provide new insight for the design of new cathode materials for SIBs with high energy density and robust stability.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Xin Wan,Yanyun Zhang,Fangfang Dong,Ning Wang,Congyi Hao,Xiang Huang,Wei Liu,Yongcheng Jin
O3-type layered oxide materials are considered one of the most promising cathode materials for sodium-ion batteries due to their high capacity. However, the structural evolution of the O3-type layered oxide during cycling is more complex, exhibiting poorer structural reversibility. In order to achieve a high electrochemical performance of O3-type sodium-ion cathode materials, we adopted a high-entropy strategy to realize multielement codoping of Mg, Co, and Ti into the transition metal layer of O3-type NaNi0.4Fe0.2Mn0.4O2 and prepared a high-entropy cathode material of NaNi0.35Mg0.05Fe0.15Co0.05Mn0.35Ti0.05O2 (NMFCMT-2). The transition metal layer doped with multiple elements Mg, Co, and Ti not only stabilizes the crystal structure and widens the layer spacing but also weakens the Na–O bonding, thereby facilitating sodium-ion diffusion and mitigating volume changes during the charge–discharge process. In situ XRD results show that this strategy can delay the phase transition of O3–P3 and realize the phase transition of P3–O3 in advance during the discharge process so that NMFCMT-2 can maintain the O3 phase to a greater extent during the cycles. The results show that the capacity retention rate was 80.6% after 200 cycles at 1C and 88.6% after 200 cycles at 5C. In addition, its high voltage cycling stability is also significantly improved compared to the pristine NaNi0.4Fe0.2Mn0.4O2.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACTA MATERIALIA
·
2025
·
IF 9.3
Hao Zhang,Tengfei Hu,He Qi,Huifen Yu,Lisha Li,Jie Wu,Liang Chen,Jun Chen
Tungsten bronze, the second largest ferroelectric family after perovskite, has been extensively studied in the field of dielectric energy storage. However, tungsten bronze ceramics, especially the filled type, face a severe challenge of reaching high energy density and high efficiency, making it difficult to match the energy storage performance of perovskites. In this work, we propose high-entropy strategy in filled type tungsten bronze ceramics to meticulously engineer dipole glass, manifesting as completely different polarization magnitudes and angles between adjacent dipoles. Combining the apparent enhancement of breakdown strength and the significant reduction of polarization hysteresis loss driven by highly disordered dipole glass, an impressive recoverable energy density of 8.9 J/cm 3 with an ultrahigh efficiency of 91 % can be achieved in the high-entropy tetragonal filled tungsten bronze ceramics, endowing tungsten bronzes with considerable energy storage competitiveness compared to perovskites. This work provides an effective avenue to develop and expand new high-performance energy storage materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
YuKai Hua,MingPei Tan,Ming Liu,Xiao Yu,Donghai Wang,Yong Liu
P2-type layered metal oxides are promising cathode materials for Na-ion batteries (NIBs), but they suffer from Na + /vacancy ordering and P2-O2 phase transitions during charge–discharge processes, resulting in rapid capacity decay and poor rate performance. In this study, a non-equimolar five-component medium-entropy strategy was employed to design a Na 0.67 Ni 0.19 Cu 0.07 Zn 0.07 Mn 0.60 Ti 0.07 O 2 (NNCZMT) material. Unlike equimolar high-entropy designs, Ni and Mn remain as the main components, with Ni providing high capacity through the Ni 2+ /Ni 4+ redox couple and Mn stabilizing the P2 structure. The introduction of Cu 2+ , Zn 2+ , and Ti 4+ , which have slightly larger ionic radii and the same valence states as Ni 2+ and Mn 4+ , respectively, allows for mutual substitution, synergistically promoting a solid-solution reaction and excellent Na + diffusion kinetics. The NNCZMT electrode delivers a high reversible capacity of 110 mAh g −1 at 10 mA g −1 , an initial Coulombic efficiency of 96.8 %, remarkable cycling stability (94.7 % capacity retention after 100 cycles at 200 mA g −1 ), and excellent rate performance (57.2mAh g −1 at 2000 mA g −1 ).
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2025
·Vol. 18
·期 14
·3409
·
IF 3.2
Hongwei Huang,Haojun Liu,Yang Wang,Yi Li,Qian Li
Prussian blue analogs (PBAs) are widely recognized as promising candidates for aqueous zinc-ion batteries (AZIBs) due to their stable three-dimensional framework structure. However, their further development is limited by their low specific capacity and unsatisfactory cycling performance, primarily caused by phase transformation during charge–discharge cycles. Herein, we employed a high-entropy strategy to introduce five different metal elements (Fe, Co, Ni, Mn, and Cu) into the nitrogen–coordinated Masites of PBAs, forming a high-entropy Prussian blue analog (HEPBA). By leveraging the cocktail effect of the high-entropy strategy, the phase transformation in the HEPBA was significantly suppressed. Consequently, the HEPBA as an AZIB cathode delivered a high reversible specific capacity of 132.1 mAh g−1at 0.1 A g−1, and showed exceptional cycling stability with 84.7% capacity retention after 600 cycles at 0.5 A g−1. This work provides innovative insights into the rational design of advanced cathode materials for AZIBs.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
功能材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）