ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yue Zhang,Tao Lu,Yike Ye,Weiji Dai,Yin’an Zhu,Ye Pan
We used entropy engineering to design a series of CoFe2O4-type spinels. Through microstructural characterization, electrochemical measurements, and X-ray photoelectron spectroscopy, we demonstrated that the entropy-stabilized oxide (Co0.2Mn0.2Ni0.2Fe0.2Zn0.2)Fe2O4 has a single-phase spinel structure and exhibits both efficient and stable catalytic oxygen evolution. This is attributable to disordered occupation of multivalent cations, which induces severe lattice distortion and increases configurational entropy, thereby facilitating formation of structurally stable, high-density oxygen vacancies on the exposed surface of the spinel. Thus, more catalytic sites on the surface are activated and retained over the course of long-duration testing for oxygen evolution. Entropy engineering expands researchers’ access to catalysts that link entropy-stabilized structures to useful properties.
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 47
·19086-19093
·
IF 5.7
Xiaowei Zhu,Wei Liu,Guobin Zhu,Siyu Xiong,Deqin Chen,Xiuyun Lei,Laijun Liu,Chunchun Li
The present study reports on entropy-engineered perovskite ceramics (Ca1/3Sr1/3Ba1/3)(SnxTi1−x)O3 (CSBTO-xSn) with varying Sn-doping levels (x = 0.1, 0.2, 0.3), achieved through synergistic compositional design in both the A-sites and B-sites of the perovskite. Increasing the Sn-doping content induces a transition in configuration entropy from medium to high values. Notably, at an optimal composition of x = 0.1, the ceramic exhibits exceptional energy storage characteristics including an ultrahigh recoverable energy density (Wrec) of 5.05 J cm−3 and a high efficiency (η) of 82.56% at an electric field strength (Eb) of 540 kV cm−1 over a wide temperature range spanning from 30 to 100 °C and frequencies ranging from 1 Hz to 200 Hz. Furthermore, this ceramic demonstrates remarkable charge–discharge properties with a discharge energy density (Wdis) of 2.94 J cm−3 and a rapid discharge rate of t0.9 ∼ 67 ns. This study underscores the effectiveness of entropy engineering as a viable approach for developing advanced energy storage capacitors.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongtian Li,Jianwei Zhao,Yong Li,Longyu Chen,Xiaoxin Chen,Hailan Qin,Huanfu Zhou,Peifeng Li,Jinming Guo,Dawei Wang
Piezoelectric ceramics, as essential components of actuators and transducers, have captured significant attention in both industrial and scientific research. The “entropy engineering” approach has been demonstrated to achieve excellent performance in lead-based materials. In this study, the “entropy engineering” approach was employed to introduce the morphotropic phase boundary (MPB) into the bismuth ferrite (BF)-based lead-free system. By employing this strategy, a serial of novel “medium to high entropy” lead-free piezoelectric ceramics were successfully synthesized, namely (1–x)BiFeO3–x(Ba0.2Sr0.2Ca0.2Bi0.2Na0.2)TiO3 (BF–xBSCBNT, x = 0.15–0.5). Our investigation systematically examined the phase structure, domain configuration, and ferroelectric/piezoelectric properties as a function of conformational entropy. Remarkable performances with a largest strain of 0.50% at 100 kV/cm, remanent polarization ∼40.07 μC/cm2, coercive field ∼74.72 kV/cm, piezoelectric coefficient ∼80 pC/N, and d*33 ∼500 pm/V were achieved in BF–0.4BSCBNT ceramics. This exceptional performance can be attributed to the presence of MPB, coexisting rhombohedral and cubic phases, along with localized nanodomains. The concept of high-entropy lead-free piezoelectric ceramics in this study provides a promising strategy for the exploration and development of the next generation of lead-free piezoelectric materials.
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
ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Xiangyu Wang,Boyuan Cao,Hengbo Yin,Pengfei Yan,Tong Liu
The flexible manipulation of the position and type of metal cations in spinel ferrites gives the possibility of tuning its dielectric and magnetic properties, thus opening up broad design space for broadband and low-frequency absorption. However, there are still challenges in how to ensure that metal cations of diverse designs can be effectively introduced into the ferrite lattice to form homogeneous entropy-stable compounds, and further engender stable ferrite compounds with special multi-interface and hollow micro-nano structures to achieve lightweight and efficient performance. In this paper, the opened-hollow multi-shell high-entropy (FeCoNiZnMg)Fe 2 O 4 @C microspheres with a controllable carbon-coated triple-shell and entropy-stable ferrite composition are constructed. The designed hollow triple-shell structure enhances the magnetic interactions between the shells and regulates the magnetic domain structures and effective fields. The (FeCoNiZnMg)Fe 2 O 4 @C microspheres achieve an incredibly high absorption strengths (−60.5 dB) and wide effective absorption (9.3 GHz). Meanwhile, the high entropy effect effectively adjusts the anisotropic magnetic field size, significantly improving the low-frequency absorption of 4–8 GH band, far exceeding the performance of ferrite@C materials without forming a high-entropy phase. This unique hollow multi-shell ferrite@C composite based on high entropy strategy offers exciting prospects for rational composition and accurate structure construction for multi-interface polarization and lightweight design.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2023
·Vol. 133
·期 23
·
IF 3.2
Shen Jibing,Zhang Min,Lin Shuai,Song Wenhai,Liu Huijun,Liu Qiangchun,Zhu Xuebin,Sun Yuping
The application of microwave absorption materials, which can effectively convert electromagnetic energy into thermal energy and/or other forms of energy, can effectively solve the increasingly serious electromagnetic pollution. As a type of promising microwave absorption material, ternary transition metal carbides/nitrides MAX phases possess layered structure and superior conduction loss capability. However, poor impedance matching and single polarization loss type seriously hinder their improvement of microwave absorption performance. High-entropy engineering is expected to be an effective strategy to address the above problems simultaneously. Herein, a series of low-, medium-, and high-entropy MAX phases with Ti 2 AlC structure were successfully synthesized and their structure, composition, and morphology were comprehensively characterized. High-entropy MAX phase (Ti 1/5 Zr 1/5 V 1/5 Nb 1/5 Ta 1/5 ) 2 AlC presents excellent microwave absorption performance with the optimal minimum reflection loss (RL min ) of −47 dB at 11.92 GHz (a thickness of 2.4 mm) and optimal effective absorption bandwidth of 3.92 GHz between 8.48 and 12.4 GHz (a thickness of 2.78 mm), which are better than those of our prepared low-/medium-entropy MAX phases as well as most of the other previously reported MAX phases. Such excellent microwave absorption performance of (Ti 1/5 Zr 1/5 V 1/5 Nb 1/5 Ta 1/5 ) 2 AlC is attributed to high-entropy engineering, which not only optimizes the impedance matching through regulating permittivity but also introduces more polarization loss type and amount. This work reveals that high-entropy engineering is not only a workable method to enhance the microwave absorption performance in MAX phases, but also an effective strategy to tailor the balance between impedance matching and loss capability through compositional design in single-phase systems.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Xusheng Liu,Keli Wang,Peng Li,Qiqi Tang,Zhenlong Huang,Yuan Lin,Wu Wang,Binbin Jiang,Jiaqing He
Entropy engineering has emerged as an effective strategy for improving the figure-of-merit zT by decelerating the phonon transport while maintaining good electrical transport properties of thermoelectric materials. Herein, a high average zT of 1.54 and a maximum zT of 2.1 are achieved in the mid-entropy GeTe constructed by Ag, Sb, and Pb alloying. At room temperature, the mid-entropy GeTe tends to be a cubic structure. And the power factor is improved from 7.7 μW·cm −1 ·K −2 to 16.2 μW·cm −1 ·K −2 due to the large increase in effective mass and the optimized carrier concentration. The increasing disorder created by heavy and off-centering Ag, Sb, and Pb atoms induces strong mass/strain fluctuations and phonon scattering to decelerate the phonon transport in GeTe. A low lattice thermal conductivity is obtained in the medium-entropy GeTe-based material. Moreover, a GeTe-based thermoelectric cooler is fabricated with the cooling temperature difference of 66.6 K with the hot end fixed at 363 K. This work reveals the effectiveness of entropy engineering in improving the average zT in GeTe and shows potential application of GeTe as a thermoelectric cooler.
研究领域:
材料科学
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热电材料研究
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Abdul Basit,Tanveer Hussain,Xin Li,Jiwu Xin,Bin Zhang,Xiaoyuan Zhou,Guoyu Wang,Ji-Yan Dai
Being a major obstacle, Ag2Te has always been restricted in p-type AgSbTe2-based materials to improve their thermoelectric performance. This work reveals a stabilized AgSbTe2 through Sn/Ge alloying as synthesized by melting, annealing, and hot press. Interestingly, addition of Sn/Ge in AgSbTe2 extended the solubility limit up to ∼30% and hence suppressed Ag2Te in Ag(1–x)SnxSb(1–y)GeyTe2 compounds and led to enhanced electrical transport. Moreover, electrical and thermal transport properties of AgSbTe2 have been greatly affected by the phase transition of Ag2Te near 425 K. However, high-entropy Ag0.85Sn0.15Sb0.85Ge0.15Te2 compound results in a stabilized rock-salt structure and presents a high power factor of ∼10.8 μW cm–1 K–2 at 757 K. Besides, density functional theory reveals that available multivalence bands in Sn/Ge-doped AgSbTe2 lead to reduction in energy offsets. Meanwhile, a variety of defects appear in the Ag0.85Sn0.15Sb0.85Ge0.15Te2 sample due to entropy change, and thus lattice thermal conductivity decreases. Ultimately, a high figure of merit of ∼1.5 is attained at 757 K. This work demonstrates a roadmap for other group IV–VI materials so that the high-entropy approach may inhibit the impurity phases with extended solubility limit and result in high thermoelectric performance.
研究领域:
材料科学
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物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2024
·Vol. 12
·期 6
·2411861
·
IF 14.3
Xu Feng,Guanfeng Gao,Quanhua Lin,Yongkang Yang,Jiajia Tan,Ziang Liu,Jianrong Qiu,Xiaofang Jiang,Shifeng Zhou
The entropy mediated temperature-structure evolution has attracted significant interest, which is used for the development of functional alloys and ceramics. But such strategy has not yet been demonstrated for development of non-metallic glasses. Herein, the successful application of the entropy engineering concept to non-metallic glass to manipulate its in situ crystallization process is demonstrated. The comparison of the entropy concept in alloys, ceramics, and non-metallic glass is discussed. As a typical example, the activation and preservation of the entropy stabilized effect of a typical niobosilicate glass system at different temperatures are studied. The relation between the micro-configurations and the entropic property is analyzed. Via the entropy engineering strategy, the crystallization of the niobosilicate glass can be manipulated. As a result, the LiNbO 3 nanocrystal-in-glass (NiG) composite with high crystallinity is developed, which exhibits 8 times higher nonlinearity compared with the β -BBO crystal. The developed NiG composite is demonstrated for practical application in precise measurement of the duration and phase of ultra-short femtosecond pulse.
研究领域:
材料科学
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凝聚态物理
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Zheng Yunpeng,Zhang Qinghua,Shi Caijuan,Zhou Zhifang,Lu Yang,Han Jian,Chen Hetian,Ma Yunpeng,Zhang Yujun,Lin Changpeng,Xu Wei,Ma Weigang,Li Qian,Yang Yueyang,Wei Bin,Yang Bingbing,Zou Mingchu,Zhang Wenyu,Liu Chang,Dou Lvye,Yang Dongliang,Lan Jin-Le,Yi Di,Zhang Xing,Gu Lin,Nan Ce-Wen,Lin Yuan-Hua
Thermoelectrics converting heat and electricity directly attract broad attentions. To enhance the thermoelectric figure of merit, zT , one of the key points is to decouple the carrier-phonon transport. Here, we propose an entropy engineering strategy to realize the carrier-phonon decoupling in the typical SrTiO 3 -based perovskite thermoelectrics. By high-entropy design, the lattice thermal conductivity could be reduced nearly to the amorphous limit, 1.25 W m −1 K −1 . Simultaneously, entropy engineering can tune the Ti displacement, improving the weighted mobility to 65 cm 2 V −1 s −1 . Such carrier-phonon decoupling behaviors enable the greatly enhanced μ W / κ L of ~5.2 × 10 3 cm 3 K J −1 V −1 . The measured maximum zT of 0.24 at 488 K and the estimated zT of ~0.8 at 1173 K in (Sr 0.2 Ba 0.2 Ca 0.2 Pb 0.2 La 0.2 )TiO 3 film are among the best of n -type thermoelectric oxides. These results reveal that the entropy engineering may be a promising strategy to decouple the carrier-phonon transport and achieve higher zT in thermoelectrics.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2024
·
IF 3.5
Le Fu,Bohan Wang,Fuqing Jiang,Wenjun Yu,Wei Xia
Solid-state reaction (SSR) is frequently used to fabricate bulk high-entropy ceramics (HECs). However, a high temperature and a long dwelling time are typically required to allow the occurrence of SSR. Meanwhile, conventional HECs were typically composed of single-phase solid solution with micrograins. It is of great interest to develop nanocrystalline dual-phase HECs under mild conditions. Here, we fabricated entropy-mediated crystalline-amorphous dual-phase ceramic nanocomposites, and the fabrication process showed significantly higher energy and time efficiency than the conventional SSR. The nanocomposites were composed of entropy-mediated nanoparticles (EM-NPs) embedded in an amorphous SiO 2 matrix. The constituent elements were homogeneously distributed in the EM-NPs at the atomic level. The EM-NPs were dislocations-free but with lattice strain, and they showed a strong coarsening tendency during annealing. The nanocomposites showed a significant solid solution hardening effect. The reported results would provide useful guidance to fabricate nanocrystalline HECs with crystalline-amorphous dual-phase microstructure.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Chunxiao Jin,Pan Gao,Shuwei Zhou,Yuxue Yue,Saisai Wang,Renqin Chang,Cuiyu Li,Tulai Sun,Songpei Zhang,Yihui Cai,Yihan Zhu,Jia Zhao,Xiaonian Li
Alloying and phase separation of multimetallic catalysts induced by external environments are common phenomena. Understanding the structure–activity relationship of the deactivation process is crucial for tailoring highly stable active sites. Herein, characterization and long-term evaluation found that there are two main reasons for the deactivation of CuNi catalysts in acetylene selective hydrogenation: (1) Metal Ni segregation; (2) Carbon deposit. Inspired by this, we uses the high mixing entropy of multiple metals to induce the formation of CuNiCs amorphous clusters (ACs) with uniform size and dispersion. And electron transfer between Ni sites and adjacent sites (Cs and Cu) forms a rich electron-rich Ni sites which effectively reduces the adsorption difference energy of acetylene and ethylene on the catalysts surface. And E ads (C 2 H 2 )-E ads (C 2 H 4 ) can be used as a descriptor for ethylene selectivity. Finally, CuNiCs/TiO 2 ACs catalysts achieved the acetylene conversion of 99.1 % and the ethylene selectivity of 92.1 % at 180 °C, and showed no signs of deactivation after 110 h long-term evaluation.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qifa Wan,Faming Zhang,Yifeng Xiong
High-entropy engineering, an emerging strategy, has recently received extensive attention for enhancing spinel oxides performance in diverse application fields. Herein, various novel non-equimolar spinel (Co,Mn,Fe,Cr,Ni,Al,Cu) 3 O 4 high-entropy oxides (HEOs) powders were successfully synthesized using a facile and scalable solid-state reaction method, which lied in the appropriate Cu cation content. The in-situ formed flaky alumina from potassium alum thermal decomposition, serving as the source of Al cation, promoted the formation of spinel HEOs powders instead of common reactive alumina powder. In particular, the infrared (IR) radiation performance of (Co 2/13 Mn 2/13 Fe 2/13 Cr 2/13 Ni 2/13 Al 2/13 Cu 1/13 ) 3 O 4 HEOs powder and coating was evaluated. This synthesized HEOs powder possessed a high IR emissivity of 0.885 in the near-IR band (0.78–2.5 µm) and good thermal stability. Notably, its IR emissivity was maintained at 0.874 with only a minimal loss of 1.2 % after high-temperature treatment. More importantly, this synthesized HEOs powder can be functioned as coating on substrates such as the Ti6Al4V alloy plate via the spraying method, exhibiting a superior IR emissivity of 0.925 and impressive radiant heat transfer capability. This work provides a good example of constructing high-performance spinel oxides through high-entropy engineering and holds great potential in developing energy-saving materials for high-temperature furnaces.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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