CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xi Ouyang,Yushan Deng,Manwen Yao,Xi Yao
The traditional approach to designing ferroelectrics through phase boundaries has limitations in regulating polarization configuration and achieving significant performance enhancements. In contrast, the concept of high-entropy materials has emerged as a promising strategy for designing new materials with enhanced properties. Herein, by incorporating the high configurational entropy ( S config ) strategy, the investigation explored the influence of S config on the electrical properties of PNN-PHT piezoceramics. The results demonstrated that high S config values were highly beneficial in improving the piezoelectric properties and significantly influenced the microstructure and grain size. The increase in S config value was found to be positively correlated with the Rayleigh coefficient ( α ), dielectric loss (tan δ ), and frequency dispersion ( γ ), while inversely correlated with the coercive electric field ( E c ). By exploring the mechanism via Raman and simulation analyses, it was discovered that high S config induces enhanced disorder, increased lattice distortion, and sharp volume changes. This ultimately resulted in a richer phase structure, reducing the potential energy barriers and leading to a lower activation energy ( E a ) required for polarization switching. This finding provides novel strategies and directions for the development of high-voltage and high-coercive-field materials, holding promise for designing piezoelectric devices with enhanced power density and precision.
研究领域:
材料科学
·
铁电学
·
固体物理
·
纳米技术
·
电子陶瓷
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Lisha Xie,Zhiyuan Cao,Jianwei Wang,Aili Wang,Shurong Wang,Yuying Cui,Yong Xiang,Xiaobin Niu,Feng Hao,Liming Ding
NiO x has been widely used as inorganic hole-transport layers (HTLs) in highly efficient hybrid perovskite solar cells (PSCs), however, the solution deposition usually induces pinhole and poor contact with perovskite . In this work, a small organic molecule adenine was used as surface modifier on NiO x substrate for the energy level modulation. After coating adenine, a 0.1 eV energy level drop for NiO x HTL, a higher crystallinity and larger grain size of perovskite layer, and an accelerated charge transport and extraction for device were achieved. Density functional theory (DFT) calculations also confirmed that the crystal structure of perovskite on NiO x /adenine substrate was more stable. These benefits enable a higher open-circuit voltage ( V oc ) and short-circuit current density ( J sc ) in the corresponding devices with significantly enhanced moisture and light stability. Our work provides a novel strategy for modulation of energy level alignment between HTL and perovskites in related photovoltaic and other optoelectronic devices .
研究领域:
材料科学
·
光伏技术
·
光电子学
·
纳米技术
·
固体物理
✓ 已验证
DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2025
·
IF 13.5
Shantao Zhang,TianAo Hou,Yandong Wang,Zhimin Fang,Yu Wu,Haolin Wang,Tao Chen,Shuang Chen,Wenhua Zhang,Shengzhong Liu,Shangfeng Yang
In the rapidly evolving field of photovoltaic technology, self-assembled monolayers (SAMs) have become essential hole-selective layers (HSLs) for inverted perovskite solar cells (PSCs). SAMs not only determine interfacial hole extraction but also significantly influence the film quality of the atop perovskite layers, consequently affecting the efficiency and stability of perovskite solar cells. Among various SAMs, carbazole-based SAMs, exemplified by 4PACZ, have emerged as prominent due to their electron-rich characteristics, making them some of the most prevalent HSLs in modern inverted PSCs. Nevertheless, 4PACZ exhibits significant limitations: one major issue is its limited molecular dipole, which leads to insufficient energy level alignment between the treated substrate and the perovskite, causing substantial interfacial energy loss. Another critical challenge is the flat structure of the carbazole unit, which often promotes molecular stacking, resulting in incomplete substrate coverage and non-uniform film formation, thereby compromising both device performance and stability. In this study, we designed a novel SAM based on a polycyclic aromatic hydrocarbon derivative, (4-(8H-dinaphtho[2,3-c:2',3'-g]carbazol-8-yl)butyl)phosphonic acid (4PADNC), with the aim of optimizing hole transport in inverted PSCs. This SAM incorporates the structurally extended dinaphtho[2,3-c:2',3'-g]carbazole (DNC) as the functional terminal group, replacing the single carbazole unit in the traditional material 4PACZ. The key structural difference is that the DNC group provides a significantly expanded π-conjugated skeleton and enhanced electron-rich characteristics. These features not only greatly enhance hole extraction and transport at the interface but also induce a significant increase in the molecular dipole moment, which is crucial for effectively adjusting the work function of ITO, ensuring proper alignment with the perovskite layer. Additionally, there is an intramolecular dihedral angle of approximately 34.62° in the DNC unit at the core of 4PADNC. This non-planar configuration contrasts sharply with the planar carbazole structure. The larger dihedral angle effectively suppresses excessive π-π stacking between molecules, which not only aids in forming a denser and more ordered molecular layer on the ITO surface but also provides a more favorable and defect-free substrate for the growth of the upper perovskite. With these upgrades, the inverted PSCs based on 4PADNC achieved a PCE as high as 24.32%, compared to 22.89% for the control devices based on 4PACZ. Furthermore, the 4PADNC-based devices also exhibited superior thermal stability and operational stability.
研究领域:
材料科学
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光伏技术
·
表面化学
·
纳米结构材料
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能源材料
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分子工程
·
器件物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 6
·2258-2272
·
IF 3.5
Luo Hanqiong,Hu Quanli,Yue Bin,Du Suxuan
Rare earth orthocobaltates nanofibers (PrCoO 3 , EuCoO 3 , and GdCoO 3 ) were prepared by a simple electrospinning method coupled with calcination. The PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers have orthorhombic perovskite structure. The fabricated electrodes presented the typical pseudocapacitive characteristics, which originated from the reversible redox reactions of Co 2+ /Co 3+ and Fe(CN) 6 3− /Fe(CN) 6 4− . At 1 A g −1 , the specific capacitances of the PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers were 119, 133, and 196 F g −1 , respectively. The electrochemical characteristics of the PrCoO 3 , EuCoO 3 , and GdCoO 3 nanofibers exhibited favorable specific capacitance, good long-term cycling stability, and high coulombic efficiency, proving the possible application into energy storage devices. PrCoO 3 and EuCoO 3 nanofibers exhibited a magnetic state transition from paramagnetic to antiferromagnetic state. GdCoO 3 nanofibers showed a paramagnetic ordering at high temperature. The cooperation of the R 3+ ions and the Co 2+ ions contributed to the magnetism of rare earth orthocobaltates nanofibers. The antiferromagnetic behaviors of the fabricated samples confirm the potential application into spin-electronic devices.
研究领域:
材料科学
·
电化学
·
纳米技术
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固态物理
·
能量存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xingxing Li,Yan Zhu,Nan Zhang,Yansheng Gong,Rui Wang,Huanwen Wang,Jun Jin,Ling Zhao,Beibei He
The development of symmetrical solid oxide fuel cells (SSOFCs) faces a significant challenge in designing electrode materials that exhibit both high activity and stability. In this work, a novel layered perovskite oxide symmetric electrode material PrBaFe 1.8 Hf 0.2 O 5+δ (PBFH) for SSOFCs is proposed and synthesized. Doping Hf at the B-site of PrBaFe 2 O 5+δ (PBF) improves the stability in reducing atmosphere and increases the concentration of oxygen vacancies . Furthermore, a small amount of RuO x is deposited by atomic layer deposition (ALD) onto PrBaFe 1.8 Hf 0.2 O 5+δ scaffold as symmetric electrodes. The surface modification of ALD-RuO x significantly boosts the catalytic activity for both fuel oxidation and oxygen reduction, simultaneously. Compared to PBF electrodes, the interfacial polarization resistances of RuO x -PBFH decrease to 0.77 Ω cm 2 under H 2 /Ar and 0.021 Ω cm 2 under air atmosphere at 800 °C, respectively. At 800 °C, SSOFCs equipped with RuO x -PBFH symmetric electrodes exhibit a high peak power density of 0.85 W cm −2 and 0.41 W cm −2 using humidified hydrogen and propane as fuels, respectively. Moreover, the RuO x -PBFH electrode demonstrates long-lasting performance, displaying high resistance against coking. These findings reveal a facile ALD approach for tailoring symmetric perovskite electrodes, offering robust and efficient electrocatalysis with efficient noble metal utilization.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体离子学
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催化化学
·
功能陶瓷
✓ 已验证
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Hui Wang,Chongrui Zhang,Lusha Jiang,Shan Tong,Yu-Chao Li,Hefu Pu,Qiang Zhao
Calcium bentonites (CaB), rich in European and Asian countries, are potential barrier materials for landfill leachate containment. However, CaB has to be converted into sodium bentonite (NaB) by Na-activation so as to facilitate intercalation modification. In this study, salt-resistant poly(acrylic acid-N, N-diethyl acrylamide) [P(AA-DEA)] was designed to intercalate and graft CaB by in situ polymerization without prior Na-activation. By this design, acrylic acid monomers were first adsorbed into interlayers of Ca-montmorillonite (Ca-MT) through the electrostatic complexation with Ca 2+ , dislodging Ca 2+ from montmorillonite surfaces. Then, ammonium ions of N, N-diethyl acrylamide were adsorbed into Ca-MT interlayers. Swelling index of the obtained CaB/P(AA-DEA) nanocomposite in aggressive coal combustion product (CCP) leachate is 15.8 mL/2g, which is as high as 3.4 times that of CaB. CaB/P(AA-DEA)-based geosynthetic clay liners (GCLs) exhibit very low hydraulic conductivity (1.6✕10 −12 m/s) to CCP leachate, which is as low as 3.3% that of the U.S. standard requirement and ∼4 orders of magnitude lower than that of CaB-based GCL. Polymer elution of CaB/P(AA-DEA)-8% in CCP leachate is as low as 1.9% that of the dry mixed samples.
研究领域:
环境工程
·
材料科学
·
土木工程
·
高分子化学
·
地质屏障材料
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2024
·Vol. 18
·期 4
·1-17
·
IF 6.1
Peng Huiting,Chen Yan,Lin Jiaopan,Benally Chelsea,El-Din Mohamed Gamal,Gao Junkai
Recently, research on hydrogel materials with a porous structure and superior water absorption capabilities significantly grown. However, the hydrogel under gravity-driven separation conditions often exhibit an unstable pore structure, poor mechanical properties, and limited functionality. To this end, this work presents a novel approach that combines a macro-micro double bionic strategy with a triple crosslinking method to develop a multifunctional alginate composite hydrogel filter (2%-SA-κ-CG-PVA-Ca 2+ , 2%-SKP-Ca 2+ for short) with a stable pore structure and superior mechanical properties, which possessed an umbrella-shaped structure resembling that of jellyfish. The 2%-SKP-Ca 2+ filter was synthesized using polyvinyl alcohol (PVA) as a stable structure-directing agent, and sodium alginate (SA) and κ-carrageenan (κ-CG) as polymer hydrogels. The distinctive umbrella-shaped hydrogel of 2%-SKP-Ca 2+ filter, formed through the triple crosslinking method, overcomes the limitations of unstable pore structure and poor durability seen in hydrogels prepared by traditional crosslinking methods. Furthermore, the utilization of the 2%-SKP-Ca 2+ filter in water treatment demonstrates its good selective permeability, excellent resistance to fouling, and extended longevity, which enables it to simultaneously achieve the multifunctional water purification and the coating of multi-substrate anti-fouling coatings. Therefore, not only does this research provide an efficient, multifunctional, highly pollution-resistant preparation method for designing a new filter, but it also confirms the application prospect of the macro-micro dual bionic strategy developed in this study in complex water treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理技术
·
仿生学
✓ 已验证
DOI
高影响因子
Water Supply
·
2022
·Vol. 22
·期 5
·5589-5602
·
IF 1.768
Lu Zhanpeng,Zeng Guilu,Zhou Zhengyuan,Liu Yulong,Wang Peng,Sheng Xianxian,Dong Jiaqi,Idress Ayesha,Sui Qian,Lyu Shuguang
As a kind of refractory chlorinated hydrocarbon, 1,2-dichloroethane (1,2-DCA) has been frequently detected in contaminated groundwater, and it is hard for common technology to degrade it due to its stability. Moreover, the existence of 1,2-DCA can do harm to human organs. Hence, it is urgent to develop an effective technology for the remediation of 1,2-DCA-contaminated groundwater. In this study, a calcium peroxide (CaO 2 ) system activated by Fe(III) was applied to the degradation of 1,2-DCA and 83.3% of 1,2-DCA could be effectively removed within 3 h when the molar ratio of CaO 2 /Fe(III)/1,2-DCA was 30/120/1. The results of probe experiments, electron paramagnetic resonance (EPR) detection, and scavenging tests demonstrated that both HO • and O 2 −• were the key factors for 1,2-DCA degradation. The released amount of Cl − (84.1%) revealed that most of the chlorine in 1,2-DCA could be dechlorinated. GC-MS was applied for the detection of intermediates during 1,2-DCA degradation and the possible degradation pathway was proposed that 1,2-DCA was first reduced to vinyl chloride (VC) and then oxidized to CO 2 and H 2 O. Finally, 73.4% removal of 1,2-DCA could be achieved in actual groundwater when the molar ratio of CaO 2 /Fe(III)/1,2-DCA was 100/400/1, demonstrating that the CaO 2 /Fe(III) system has a remarkable prospect in 1,2-DCA-contaminated groundwater remediation. Efficient degradation of 1,2-DCA in the CaO 2 /Fe(III) system was achieved. HO • and O 2 –• were the key factors for 1,2-DCA removal in the CaO 2 /Fe(III) system. The possible degradation pathway of 1,2-DCA was proposed. The effect of water matrices on 1,2-DCA degradation in the CaO 2 /Fe(III) system was investigated.
研究领域:
环境科学
·
化学工程
·
水污染控制
·
高级氧化工艺
·
污染物降解机制
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 8
·期 5
·1197-1204
·
IF 5.958
Xiao-Qin Xu,Hua Zhang,Xue-Qin Huang,Yu-Ling Liu
Ferroelastic materials have attracted wide attention due to their great application prospects in energy and information conversion, data storage applications, etc. In this report, we designed and synthesized an organic–inorganic hybrid halide perovskite ferroelastic (TMTB)CdCl3 (TMTB: N,N,N-trimethyl-tert-butylammonium) under the quasi-spherical strategy. (TMTB)CdCl3 shows a structural phase transition at around 356 K (Tc). In the ferroelastic phase, a quasi-spherical TMTB cation is orientationally ordered with the symmetry of mmm. Above the Tc in the paraelastic phase, the crystal symmetry of 6/mmm compels the TMTB cation with multiple orientations showing spherical distribution. The phase transition with an Aizu notation of 6/mmmFmmm agrees well with one of the 94 ferroelastic species. Under a polarized light microscope, the evolution of ferroelastic domains was visually observed. The calculated spontaneous strain value of (TMTB)CdCl3 is 0.0507 based on the lattice parameters. Moreover, (TMTB)CdCl3 shows prominent ‘ON’/‘OFF’ dielectric switches with good reproducibility. Theoretical calculations based on density functional theory (DFT) were further performed to explore the ‘spherical’ – ‘quasi-spherical’ variation of the TMTB cation. This work demonstrates that the quasi-spherical molecular strategy provides a shortcut for discovering new molecular ferroelastic materials, and also provides guidance for the directional design of functional materials.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
应用物理
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Kejun Liao,Lisha Xie,Yuying Cui,Shurong Wang,Chengbo Li,Aili Wang,Xiaoyu Deng,Yong Xiang,Liming Ding,Feng Hao
Crystal orientation of perovskite film and interface modification plays an important role in the efficient operation and stability of perovskite solar cells (PSC). Herein, a high quality perovskite film with large grain size, high crystallinity and preferred crystal orientation on (100) plane is deposited on an aqueous solvent (H 2 O and DMF) pretreated nickel oxide (NiO x ) substrate (HDP). The aqueous solvent treatment increases the wettability and conductivity of NiO x layer during perovskite growth. Steady-state and time-resolved photoluminescences reveals a significantly increased charge extraction efficiency in the HDP perovskite films. In addition, the HDP devices exhibit impressively improved photovoltaic performance as well as enhanced long-term stability under high moisture, UV irradiation and thermal stress. Therefore, our work provides a versatile strategy to introduce preferred orientation and interfacial modification to enhance the crystal quality and stability of halide perovskite thin films and related optoelectronic devices.
研究领域:
材料科学
·
能源技术
·
纳米技术
·
固体物理
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
·
2025
·
IF 2.2
Songxue Chen,Yong Li,Yue Jin,Zehui Hu,Yinuo Jiang,Bing Han
This study improves weak interlaminar properties of carbon fiber-reinforced PMMA (CF/PMMA) laminates by incorporating calcium sulfate whisker (CSW)/PMMA interleaf films. Compared to direct whisker sprinkling, the film method enables uniform CSW dispersion and stabilization in the matrix. ILSS and IFSS tests revealed that 6 wt% CSW content optimized performance: ILSS reached 51.8 MPa (46.9% increase vs 35.3 MPa control) and IFSS achieved 40.2 MPa (83.1% increase vs 21.9 MPa control). Excessive CSW (>6 wt%) caused agglomeration, reducing ILSS and IFSS—particularly IFSS due to interfacial defects. Microscopic analysis demonstrated that CSW enhances interlaminar strength through crack deflection, pinning, matrix pull-out, and fracture mechanisms, while improving interfacial adhesion via mechanical anchoring with carbon fibers. The film-introduction strategy effectively enhances the interlaminar shear strength and overall quality stability of CFRP laminates, while establishing a research foundation for interfacial optimization in CSW-reinforced composites.
研究领域:
材料科学
·
复合材料
·
聚合物基复合材料
·
力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Y.C. Hu,H.Y. Wang,X.W. Wang,G.L. Song,J. Su,Y.W. Cui,H. Ma,F.G. Chang
Ordered double-perovskite oxides of Sr 2− x K x FeMoO 6 (0.00 ⩽ x ⩽ 0.10) are synthesized via sol–gel method. X-ray powder diffraction analysis shows that all the samples have a single phase and exhibit I4/m symmetry. The cation order of Sr 2− x K x FeMoO 6 decreases from 94.4(2)% to 50.4(2)%, indicating that Fe/Mo is in nearly complete disorder. The magnetic property of Sr 2− x K x FeMoO 6 samples depends on temperature under zero-field-cooling (ZFC) and field-cooling (FC) processes at an applied magnetic field of 100 Oe. The thermal irreversibility behavior in the FC and ZFC curves indicates a typical cluster glass behavior in this system. The H / M versus M 2 curves indicate a second-order magnetic transition, resulting in a small variation in magnetic entropy. Antisite defect is the primary reason for the effective paramagnetic moment.
研究领域:
材料科学
·
固体物理
·
无机化学
·
磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）