JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2023
·
IF 2.7
Qingzhi Zhu,Xiang Luo,Haifeng Li,Jiabao Zang,Jihui Sun,Xutao Yan,Yijian Liu
Pure magnetic materials always exhibit mediocre microwave absorption performance due to the poor impedance matching and negligible dielectric loss capability. In this study, a novel porous aggregates of multi-element doped Fe 3 O 4 /(Fe, Co, Ni, Cu) alloys (denoted as DF/alloys) composite which is composed of magnetic/magnetic heterostructure with excellent microwave absorption performance were prepared. By reducing part of the ferrimagnetic spinel into ferromagnetic alloy, the saturation magnetization M s was enlarged which is beneficial to exceeding the Snoek′s limit, and the magnetic loss capability was further enhanced significantly. Furthermore, the abundant heterogeneous interfaces in the DF/alloys composites have greatly improved the dielectric loss capability and balanced the complex permittivity and the complex permeability, and achieved superior impedance matching of the magnetic/magnetic heterogeneous DF/alloys composites. When the loading ratio (DF/alloys to paraffin mass ratio) was only 30 wt%, the widest effective absorption bandwidth ( EAB ) reached 5.58 GHz (3.2 mm). when the loading ratio was up to 50 wt%, the widest EAB (6.4 GHz) was achieved at 2.0 mm and the minimum reflection loss ( RL min ) reached −49.3 dB at 4.15 GHz. As microwave absorption materials, the DF/alloys composites are extremely promising and competitive.
研究领域:
材料科学
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电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Batteries-Basel
·
2023
·Vol. 9
·期 2
·91
·
IF 4
Wentao Wu,Shuai Zuo,Xu Zhang,Xuyong Feng
Solid state reaction is widely used in the synthesis of electrode materials, due to its low cost and good scalability. However, the traditional solid-state reaction is not suitable for the synthesis of materials with multiple elements, such as high entropy or medium entropy materials, due to the poor homogeneity of raw material mixing. Here, we prepared multi-element doped LiNi0.5Mn1.5O4(medium entropy) cathode material by two step solid state reaction. X-ray diffraction and Raman image show that the homogeneity of multi-element doped LiNi0.5Mn1.5O4cathode has been greatly improved with this two-step method. As a result, the electrochemical performance is greatly improved, comparing to traditional solid-state reaction. First, the specific capacity at 0.1 C is increased from 126 mAh/g to 137 mAh/g. With a high current density of 10 C, the specific capacity is even increased from 64 mAh/g to 89 mAh/g with this two-step method. Second, the cycle stability is enhanced, with capacity retention of 86% after cycling at 1 C for 500 times (vs. 71% for the one-step method).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-9
·
IF 14.919
Gao Xiaoyi,Cheng Zhenxiang,Chen Zibin,Liu Yao,Meng Xiangyu,Zhang Xu,Wang Jianli,Guo Qinghu,Li Bei,Sun Huajun,Gu Qinfen,Hao Hua,Shen Qiang,Wu Jinsong,Liao Xiaozhou,Ringer Simon P.,Liu Hanxing,Zhang Lianmeng,Chen Wen,Li Fei,Zhang Shujun
(K,Na)NbO 3 based ceramics are considered to be one of the most promising lead-free ferroelectrics replacing Pb(Zr,Ti)O 3 . Despite extensive studies over the last two decades, the mechanism for the enhanced piezoelectricity in multi-elements doped (K,Na)NbO 3 ceramics has not been fully understood. Here, we combine temperature-dependent synchrotron x-ray diffraction and property measurements, atomic-scale scanning transmission electron microscopy, and first-principle and phase-field calculations to establish the dopant–structure–property relationship for multi-elements doped (K,Na)NbO 3 ceramics. Our results indicate that the dopants induced tetragonal phase and the accompanying high-density nanoscale heterostructures with low-angle polar vectors are responsible for the high dielectric and piezoelectric properties. This work explains the mechanism of the high piezoelectricity recently achieved in (K,Na)NbO 3 ceramics and provides guidance for the design of high-performance ferroelectric ceramics, which is expected to benefit numerous functional materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yao Niu,Jing Wang,Peifeng Wang,Haiyang Xing,Kai Zhang,Youlong Xu
The surface anisotropy of spinel LiMn 2 O 4 crystals exerts a profound influence on the electrochemical performance of the material. The truncated octahedral structure consists of various crystal facets such as {1 1 0}and {1 1 1}. Among them, {1 1 0} facets are conducive for the lithium-ion diffusion, although it will worsen manganese dissolution. In contrast, densely arranged {1 1 1} surfaces can reduce manganese dissolving but hinder lithium-ion diffusion. To balance ion diffusion and manganese dissolution, the ratio of {1 1 0} and {1 1 1} planes is regulated using the Mg/Al/Ti multi-doping approach. The percentage of {1 1 0} facets exposed is effectively increased by Mg/Al co-doping, and the exposure of the truncated facets improves the lithium-ion diffusion coefficient from 7.17 × 10 -12 to 1.02 × 10 -11 cm 2 s −1 , while also increasing the manganese dissolution from 1.15 % to 1.67 %. The addition of Ti reduces the proportion of truncated surfaces and mitigates manganese dissolution (1.39 %). The lithium-ion diffusion coefficient is maintained at 9.17 × 10 -12 cm 2 s −1 , and Mg/Al/Ti co-doping maintained a discharge specific capacity of 94.0 mAh/g after 500 cycles with a degradation rate of 0.062 % per cycle. Surface optimization and reconfiguration of regulated electrode materials can provide new possibilities for the development of lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiahui Feng,Tao Zhang,Zhen Yang,Kunyan Qian,Xin Wang,Wanqing Song,Panzhe Qiao,Jia Ding,Wenbin Hu
Acidic oxygen evolution reaction (OER) is crucial for developing proton exchange membrane water electrolyzers, which has been hindered by the high overpotential of iridium oxide (IrO x )-based catalysts and the scarcity of iridium. Herein, we introduce a novel strategy to synthesize ultra-thin amorphous IrO x nanosheets with flexible mono/multi-element doping. Benefiting from synergistic W/Mo/Co co-doping effect, WMoCo-IrO x nanosheets (WMC-IrO x NS) sample optimally modulates the Ir electronic structure, maintains the neutral oxygen vacancy concentration and stabilizes Ir sites. Additionally, the nanosheets expose abundant Ir active centers. WMC-IrO x NS exhibits superior OER electrocatalysis performance with a low overpotential of 241 mV, excellent stability of 275 h at 10 mA cm −2 , and a high mass activity of 545.4 A/g Ir. The catalyst follows the lattice oxygen mechanism (LOM) pathway. As observed in in situ attenuated total reflectance Fourier transform infrared spectroscopy, compared to the un-doped sample, WMC-IrO x NS accumulates negligible Ir–O–O* intermediates. Therefore, through the multi-element synergistic co-doping effect, the catalyst weakens the adsorption energy of O–O* intermediates and promotes O 2 release, thereby lowering OER energy barriers in acidic conditions. This work opens an inspiring avenue for designing IrO x -based catalysts with high activity and low Ir usage.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xinyan Shi,Jiaxin Song,Fengqi Zhao,Hongxu Gao,Xinbing Chen,Pei Chen,Zhongwei An,Yu Chen
Developing an efficient, stable and low cost oxygen reduction reaction electrocatalyst is desirable for fuel cells and metal-air batteries. Here, we have successfully prepared multi-element doped carbon nanobowls by simply mixing the porous carbon nanobowls and sulfur doped graphitic carbon nitride quantum dots in FeCl 3 solution and subsequent high temperature treatment processes. Compared with the commercial Pt/C electrocatalyst, the multi-element doped carbon nanobowls display a comparable half-wave potential of 0.82 V, much larger limiting diffusion current density (0.4–0.8 V), better methanol-tolerance and higher long-term stability for the oxygen reduction reaction in alkaline media. The robust three-dimensional porous structure of carbon nanobowls and multiple active centers derived from Fe, N, S and O co-doping are responsible for the excellent performance. This work suggests that such multi-element doped carbon nanobowls can be a promising alternative for Pt-based catalysts in fuel cells.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2024
·
IF 10.5
Yixin Wang,Sha Liu,Tiantian Wang,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
In this study, the multi-element doped carbon nanospheres with core-shell structure (N,P,S-PCNs) have been successfully synthesized through the carbonization of hyper-cross-linked polystyrene nanospheres (HPSs) encapsulated with poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS). The phosphonitrilic chloride trimer can in-situ assemble on HPSs surface, forming a poly(phosphonitrilic chloride trimer) film via sulfonyldiphenol as cross-linking agent to obtain HPSs@PZS. Subsequently, the HPSs@PZS undergoes high-temperature calcination under N 2 atmosphere, and PZS with a well-preserved encapsulation capability efficiently incorporated N, P and S into carbon nanospheres to gain multi-element (N,P,S) co-doped carbon nanospheres (N,P,S-PCNs) with core-shell structure. The prepared N,P,S-PCNs exhibit exceptional dispersibility and stability as lubricant additives, effectively mitigating friction (reduced to 0.106) and wear (decreased by 84.0 %). The lubrication performance of N,P,S-PCNs is exceptional due to the nanospheres' remarkable ability to enter the gaps between friction pairs and form a deposition film on the surfaces. Moreover, the nanospheres can undergo a chemical reaction with the matrix surface, resulting in the formation of a chemical protective film. The composite protective film (deposition film and chemical protective film) significantly enhances the lubricants' ability to reduce friction and resist wear.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yi Wang,Yixin Wang,Shenghua Xue,Bin Liu,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
The development of advanced lubricant additives is crucial for improving the tribological properties in mechanical systems. Doping has been certified as one of the effective methods for enhancing the lubricating properties of carbon nanomaterials. Herein, multielement (B, N, P)-doped porous carbon nanosheets (B, N, P@PCNs) were successfully prepared using ionic liquid-assisted pyrolysis of “copper–pyridine” coordination metal–organic frameworks (Cu-MOFs). The as-obtained B, N, P@PCNs exhibit good friction-reducing and antiwear behavior as lubricant additives. Compared to base oil 500SN, the friction coefficient was reduced to 0.104, resulting in a 77.5% decrease in wear volume, and the load-bearing capacity increased from 150 to 550 N simultaneously. Through Raman and XPS analysis, it was ascertained that the boron, nitrogen, and phosphorus elements actively participate in tribological chemical reactions, resulting in the formation of a protective film, which significantly mitigates wear and tear of friction pair by combining adsorption, restoration, and polishing mechanisms.
研究领域:
材料科学
·
表面工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2020
·
IF 8.821
Wenda Li,Dezhu Wang,Zhijiang Gong,Xiaosong Guo,Jing Liu,Zhonghua Zhang,Guicun Li
Rechargeable non-aqueous potassium-ion batteries have been regarded as one of ideal candidates for large-scale electric energy storage applications . However, the achievement of high reversible capacity and rate capability is still a great challenge. In this work, an extraordinary S-/N-/O- multielement-doped three-dimensional (3D) flower-like hard carbon architecture is firstly proposed as promising anode material for low-cost potassium-ion batteries. The 3D flower-like architecture not only provides abundant exposed surface-active sites but acts as highly conductive interconnected network for electron transport . More encouragingly, the introduction of highly reactive -N-C x -S- species has been revealed to show highly reversible pseudo-capacitive charge storage behavior, inherently enlarging the slope reversible capacity to the highest value of 423 mAh g −1 at low current density of 0.05 A g −1 . As well, benefitted from the structural and compositional advantages, an unprecedented rate capability (251 mAh g −1 at 1.0 A g −1 ) and stable cycling stability (362 mAh g −1 after 300 cycles at 0.5 A g −1 ) has been obtained, which outperforms most of carbonaceous materials for K-ion storage. Our present work not only provide new understandings on surface/conversion-synergistic driven K-ion storage mechanisms but offer effective material engineering strategies for improving the properties of potassium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Rongzhang Yang,Hao Liang,Meiran Chen,Fengqi Lu
Layer SnS 2 has been garnered significant attention for next-generation lithium-ion batteries (LIBs), due to its abundant resources and high theoretical capacity. However, the low initial Coulombic efficiency, large volume expansion and structural degradation have significantly hindered its application in LIBs. Herein, the layer Sn 0.7 (MoFeCoNiV) 0.3 S 2 nanosheets (HE3-SnS 2 ) grown on the conductive substrate carbon cloth (CC) is synthesized by one-step hydrothermal method. Multiple elements doping strategy not only increases the conformational entropy which will improve the structural stability of during cycling, but also enlarges the interlayer spacing which benefits for lithium-ion transfer. As a result, the additive-free integrated CC@HE3-SnS 2 electrode achieves a high reversible specific capacity of 1204.9 mAh g −1 with a high initial Coulombic efficiency of 94.7 % at 1C, and maintains 1011.4 mAh g −1 after 100 cycles. Specifically, the CC@HE3-SnS 2 anode exhibits excellent rate capability of 670.8 mAh g −1 at 10C. Moreover, the full cell based on CC@HE3-SnS 2 anode and commercial LiCoO 2 cathode displays a stable capacity retention of 862.7 mAh g −1 after 100 cycles at 1C. The entropy-stabilized SnS 2 -based anode with high initial Coulombic efficiency and rate capability has a competitive candidate for LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qiang Xiao,Xianliang Song,Xiaojuan Jin
The advancement of rechargeable zinc-air batteries (ZABs) faces significant challenges, particularly due to substantial polarization and the slow kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Multi-element doping represents an effective strategy to address the deficiencies in catalytic activity and stability observed in single-atom catalysts. In this study, we prepare an activated lignin carbon catalyst doped with three elements (N, S, and B) via salt assisted (KOH), referred to as AL-NSB, with the aim is to achieve bifunctional catalysis through the synergistic interaction between the three elements to influence the distribution of the electron cloud and the extent of carbonaceous defects within the catalyst. The catalyst exhibits an ORR half-wave potential ( E 1 / 2 ) of 0.798 V relative to the reversible hydrogen electrode. The superior activity of AL-NSB results in a peak power density of 293.76 mW cm − 2 for the ZAB, along with an excellent cycle lifetime exceeding 1000 h, surpassing the performance of commercial Pt/C-RuO 2 catalysts. The findings of this study underscore the critical roles of N, S, and B in enhancing the activity and stability of both the oxygen reduction and evolution reactions.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yang Gao,Weishuang Fang,Tianyi Xie,Haiyi Peng,Xiaogang Yao,Huixing Lin
Mg 1–3 x (CoNiZn) x Ta 2 O 6 ceramics ( x = 0.00, 0.05, 0.10, 0.20, and 0.25) were synthesized by the solid-phase reaction method. The XRD and Rietveld refinement results suggest that the Mg 1–3 x (CoNiZn) x Ta 2 O 6 ceramics have a pure tri-rutile structure. (Co 1/3 Ni 1/3 Zn 1/3 ) 2+ can significantly broaden the sintering temperature range of ceramics. The chemical bonding theory reveals that the A-O bond (A = Mg, Co, Ni, or Zn) ionicity and Ta-O bond ionicity are closely related to the porosity corrected relative permittivity ( ε r -corr. ). The increase in A-O bond energy contributes to the greater stability of the AO 6 octahedron , resulting in a decrease in | τ f |. Additionally, the Raman spectroscopy reveals that there is a negative relationship between the Qf value and the full width at half maximum ( FWHM ) of the strongest peak of the A 1g mode. Correspondingly, Mg 0.4 (CoNiZn) 0.2 Ta 2 O 6 ceramic has excellent microwave dielectric properties after sintering at 1450°C for 4 h: ε r = 28.9, Qf = 91,900 GHz (at 7.4 GHz), and τ f = 44 ppm/°C. Furthermore, Mg 0.4 (CoNiZn) 0.2 Ta 2 O 6 ceramic can maintain a stable Qf value (∼ 91,000 GHz) across a broad range of sintering temperatures (150°C), which is a result of the combination of densification and FWHM . This characteristic facilitates adaptation to changes in furnace temperature in large-scale production. The strategy of multiple-element substitution to extend the sintering temperature range is expected to be applied to other ceramic systems.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）