JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shixuan Zhu,Dexu Zhang,Zhihong Xue,Yiqiang He,Cailing Chen,Zhan Shi
Establishing robust atomic-level interfaces, particularly through the selective modulation of surface active sites within heterojunctions to achieve superior solar energy conversion, remains largely unexplored. Herein, sulfur vacancy sites (V S ) in ZnIn 2 S 4 (ZIS) are selected, driven by the interaction between unsaturated zinc sites and the nitrogen-rich sites of g-C 3 N 4 , forming a step-scheme (S-scheme) heterojunction. The defect-induced interfacial Zn–N–C bonds not only provide rapid channels at the atomic level, thereby lowering the energy barrier for charge transfer, but also selectively tune the highly active pyrrolic N site to enhance H 2 evolution. Furthermore, molecular dynamics simulations (MD) combined with density functional theory (DFT) calculations reveal that V S regulates the pyrrolic N sites within the heterojunction, leading to a reduction in the Gibbs free energy for hydrogen production. Kinetic analysis by carrier transport activation energy (CTAE) indicates that the charge transfer energy barrier is accelerated, decreasing from 211.20 eV for ZIS/CN-360 % to 155.71 eV for V S -ZIS/CN-360 %. Consequently, the designed catalyst significantly enhances the H 2 yield (27.94 mmol g −1 h −1 ) in the absence of platinum. This work emphasizes the importance of generating defect-induced interfacial atomic channels, as well as changes in the surface microenvironment, which underscore the significance of defect heterostructures in promoting the photocatalytic process.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 1
·77-90
·
IF 2.914
Shen Bin,Dong Chencheng,Yang Bo,Xing Mingyang,Zhang Jinlong
Abstract A novel defect-induced inorganic photoluminescence powder silica (CSI-SiO 2 ) nanomaterial was successfully synthesized via a facile method, where Cs + was doped into SiO 2 by ion exchange, and oxygen vacancy defects were produced during a vacuum calcination treatment at high temperature. CSI-SiO 2 was characterized by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy. The result showed that CSI-SiO 2 contained merely three elements including Cs, Si, and O. Compared with conventional fluorescent materials, the preparation method of fluorescent material (CSI-SiO 2 ) didn’t need the precursor of heavy metals, rare earth metals and other harm contents, making it capable to be an environmentally friendly candidate. More importantly, CSI-SiO 2 exhibited hyper-stable photoluminescence performance in harsh conditions including strong acidic, weak alkaline, moist and high temperature conditions, which can be applied in security marking. Graphic abstract The mechanism diagram of material CSI-SiO2 for defect-induced photoluminescence.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 50
·2408508
·
IF 27.4
Sheng Wu,Guangyu Zhou,Yafen Wu,Puxian Xiong,Binli Xiao,Zhiyao Zhou,Yao Xiao,Peishan Shao,Shouping Wang,Zhigang Shao,Yinzhen Wang,Feifei Wang
Mechanoluminescence (ML) materials, known for their ability to convert mechanical energy into light, are increasingly recognized for their potential applications, such as in intelligent stress sensing, in vivo bioimaging, and stress non-destructive monitoring. However, the low signal-to-noise ratio (SNR) and narrow-band emission of single-defect-induced ML materials usually limit their biological-related practical applications. Here, these limitations will be addressed by modulating the microstructure evolution in Y 3 Ga 3 MgSiO 12 :Cr 3+ through the [Si 4+ +Mg 2+ ] → [Ga 3+ +Ga 3+ ] chemical substitution strategy. Density functional theory (DFT) calculation reveals the defect types and dynamic charge migration processes. In addition, Y 3 Ga 3 MgSiO 12 : Cr 3+ with continuously distributed “shallow-deep” defects (0.68–1.61 eV) can avoid persistent luminescence (PersL) and bright-field environment interference. Herein, such high SNR near-infrared broadband ML emission may provide a reliable way for high-quality biological non-destructive sensing and detection. Finally, benefiting from the different absorption of ML signals in glucose/lipid, one may find a novel non-invasive blood glucose/lipid testing technology in patients.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dewei Liu,Qijie Zhang,Saipeng Ding,Fufeng Yan,Haiyang Dai,Tao Li,Renzhong Xue,Jing Chen,Gaoshang Gong,Cui Shang,Xuezhen Zhai
A series of nano-V 1- x Mn x O 2 samples ( x = 0–0.035) were prepared by a simple solvothermal method. XRD patterns and the Rietveld refinement results of V 1- x Mn x O 2 samples showed that Mn ions were incorporated into the V sites during the solvothermal process. XPS results indicated that the valence state of Mn ion was a mixed state of Mn 2+ , Mn 3+ and Mn 4+ . The corresponding relationship between the diameter, specific surface area and electrochemical performances of V 1- x Mn x O 2 nanorods was studied. It can be found that Mn doping promoted the insertion of K + ions into the electrode material and improved the conductivity, discharge capacity and cycle stability, which was due to more defects induced by Mn doping. The x = 0.020 sample had the largest specific capacitance (the 88% capacity retention rate after 550 cycles at 0.1 A·g −1 ) due to the improvement of structural stability by Mn-ion doping. These results provide great potential applications for nano-VO 2 (B) in the cathode material of lithium-ion battery and supercapacitor .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Dan Xu,Jiale Wei,Taolin Yu,Fujia Ben,Xinyuan Zhou,Wenping Cao,Wenjie Zhao
The BaTi 1- x (Ni 0.5 Zn 0.5 ) x O 3 ( x = 0–0.10) ceramics are prepared by conventional sintering strategy. With increasing Ni/Zn co-doping, a continuous phase transition between BaTiO 3 (BT) polymorphs is demonstrated in this work. The phase composition evolution of orthorhombic(O)/tetragonal(T)-T/cubic(C)/hexagonal(H)-H phase can be observed in Ni/Zn co-doped BT ceramics. Owing to the successive transition of this phase structure, the micro morphology is modulated from normal circular grains to elongated morphology structure. Meanwhile, the strong ferroelectricity of the pure BT with O/T symmetry is gradually suppressed, and eventually disappears in the high-concentration Ni/Zn co-doped BT ceramics ( x = 0.08, 0.10) with H symmetry. The oxygen vacancy defects induced by Ni/Zn acceptor doping at local Ti-sites are responsible for the continuous phase transformation. To maintain charge balance, A-site Ba vacancy and the reduction of Ti 4+ to Ti 3+ is generated and hence, the polar displacement of Ti-O ions is restrained in multiphase coexistence samples. For the low Ni/Zn content of x = 0.02, the broadened phase transition region is advantageous for energy storage application. The energy storage density ( W rec ) of the x = 0.02 sample is 0.49 J/cm 3 and corresponding energy efficiency ( η ) is 85 % at 140 kV/cm. The variation in electrical properties is closely associated with phase structure evolution and defects/defect dipoles caused by Ni/Zn co-doping. Our work is instructive for the design and engineering the phase composition and morphology structure of BT-based ceramics.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·645-656
·
IF 7.2
Wang Long,Liu Jiurong,Xie Shenghui,Deng Yanli,Wang Zhou,Hou Shanyue,Yue Shengying,Wang Gang,Wu Na,Zeng Zhihui
W-type barium–nickel ferrite (BaNi 2 Fe 16 O 27 ) is a highly promising material for electromagnetic wave (EMW) absorption because of its magnetic loss capability for EMW, low cost, large-scale production potential, high-temperature resistance, and excellent chemical stability. However, the poor dielectric loss of magnetic ferrites hampers their utilization, hindering enhancement in their EMW-absorption performance. Developing efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but remains challenging. Here, an efficient strategy substituting Ba 2+ with rare earth La 3+ in W-type ferrite was proposed for the preparation of novel La-substituted ferrites (Ba 1− x La x Ni 2 Fe 15.4 O 27 ). The influences of La 3+ substitution on ferrites’ EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and discussed. La 3+ efficiently induced lattice defects, enhanced defect-induced polarization, and slightly reduced the ferrites’ bandgap, enhancing the dielectric properties of the ferrites. La 3+ also enhanced the ferromagnetic resonance loss and strengthened magnetic properties. These effects considerably improved the EMW-absorption performance of Ba 1− x La x Ni 2 Fe 15.4 O 27 compared with pure W-type ferrites. When x = 0.2, the best EMW-absorption performance was achieved with a minimum reflection loss of −55.6 dB and effective absorption bandwidth (EAB) of 3.44 GHz.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Ling-Ling Zheng,Lei Tian,Long-Shuai Zhang,Jian Yu,Ying Chen,Qian Fu,Xiao-Zhen Liu,Dai-She Wu,Jian-Ping Zou
The waste of carbon sources and greenhouse gas production during wastewater treatment have become extremely important environmental issues. Herein, the BiOBr/BiVO4 compounds with defect-induced frustrated Lewis acid–base pairs (DFLPs) and internal charge transfer were fabricated to convert the organic pollutants into CO with nearly 100% selectivity. The oxygen vacancy (Ov) induced the built-in electric field in BiOBr/BiVO4 to create directional charge transfer from BiOBr to BiVO4. Density functional theory (DFT) calculations prove that the Ov combines its adjacent hydroxyls to form the DFLP active sites that can additionally capture and activate CO2. Meanwhile, the active sites in BiOBr/BiVO4 reduce the formation-free energy of the COOH* intermediates, which is the key rate-limiting step to convert CO2 to CO with high selectivity. This system has achieved selective conversion of value-added chemicals from organic pollutant degradation and provides a theoretical basis for actual wastewater recycling of carbon sources.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 42
·1903297
·
IF 10.856
Xiaofeng Zhang,Xiaocui Li,Ruchun Li,Yang Lu,Shuqin Song,Yi Wang
Developing highly efficient electrocatalysts with earth abundant elements for oxygen evolution reaction (OER) is a promising way to store light or electrical energy in the form of chemical energy. Here, a new type of electrocatalyst with core–shell carbon/NiCo 2 O 4 double microtubes architecture is successfully synthesized through a hydrothermal method combined with the calcination process with wet tissues as the template and carbon resource. The outer NiCo 2 O 4 nanosheet arrays contain abundant defects, which come from reduction of the carbon in wet tissues. This indicates that carbon is a very excellent defect inducer. The inner carbon microtubes can act as the robust structure skeleton and these core–shell double microtubes provide abundant diffusion channels for oxygen and electrolyte, both of which contribute to improving the stability by avoiding damage to the electrode from produced O 2 bubbles and the collapse of the outer NiCo 2 O 4 microtubes. Electrochemical results show that the electrode, core–shell carbon/NiCo 2 O 4 double microtubes loaded on carbon cloth, exhibits prominent electrocatalytic activity with an overpotential of only 168 mV at 10 mA cm −2 and a Tafel slope as low as 57.6 mV dec −1 in 1.0 mol L −1 KOH. This new type of electrocatalyst possesses great potential in water electrolyzers and rechargeable metal–air batteries.
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
Nanoscale
·
2022
·Vol. 14
·期 29
·10449-10455
·
IF 8.307
Rui Hao,Xiaodie Li,Lingling Zhang,Lei Zhang,Hongjun You,Jixiang Fang
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have been widely investigated for optoelectronic applications. Here, by employing the nanocasting method, molybdenum disulfide (MoS2) nanostructures, including supercrystals, nanoparticles and nanowires, are synthesized with curved features by changing the precursor concentration and template types. The Raman properties of different MoS2 nanostructures are investigated by varying the laser power under both resonant and non-resonant excitations. The defect disorder induced LA(M) mode and other silent Raman modes in planar 2D materials are clearly observed under the resonant excitation. We believe that the varying optical properties of TMDC nanostructures will greatly broaden the optoelectronic applications of 2D materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 28
·期 3
·035601
·
IF 3.573
Jin Shen,Chunlei Wang,Shuhong Xu,Changgui Lv,Ruohu Zhang,Yiping Cui
In this work, highly luminescent quaternary CuNiInS nanocrystals (NCs) are put forward as a good prototype for investigating defect-induced room temperature ferromagnetism. A ferromagnetic Ni cation can preserve the strong luminescence of NCs without introducing intermediate energy levels in the center of the forbidden band. The strong luminescence of NCs is used as an indicator for monitoring the concentration of vacancy defects inside them, facilitating the investigation of the origin of room temperature ferromagnetism in CuNiInS NCs. Our results reveal that the patching of Cu vacancies ({{{\rm{V}}}_{{\rm{Cu}}}}^{-}) with Ni will result in bound magnetic polarons composed of both {{{\rm{V}}}_{{\rm{Cu}}}}^{-} and a substitution of Cu by Ni ({{{\rm{Ni}}}_{{\rm{Cu}}}}^{+}), giving rise to the room temperature ferromagnetism of CuNiInS NCs. Either the ferromagnetic Ni or the non-ferromagnetic Cu cation can tune the magnetism of CuNiInS NCs because of the change of bound magnetic polaron concentration at the altered concentration ratio of {{{\rm{V}}}_{{\rm{Cu}}}}^{-} and {{{\rm{Ni}}}_{{\rm{Cu}}}}^{+}.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 32
·期 14
·1905578
·
IF 27.398
Jiewei Chen,Bi Luo,Qiushui Chen,Fei Li,Yanjiao Guo,Tom Wu,Peng Peng,Xian Qin,Gaoxiang Wu,Mengqi Cui,Lehao Liu,Lihua Chu,Bing Jiang,Yingfeng Li,Xueqing Gong,Yang Chai,Yongping Yang,Yonghua Chen,Wei Huang,Xiaogang Liu,Meicheng Li
The rate-determining process for electrochemical energy storage is largely determined by ion transport occurring in the electrode materials. Apart from decreasing the distance of ion diffusion, the enhancement of ionic mobility is crucial for ion transport. Here, a localized electron enhanced ion transport mechanism to promote ion mobility for ultrafast energy storage is proposed. Theoretical calculations and analysis reveal that highly localized electrons can be induced by intrinsic defects, and the migration barrier of ions can be obviously reduced. Consistently, experiment results reveal that this mechanism leads to an enhancement of Li/Na ion diffusivity by two orders of magnitude. At high mass loading of 10 mg cm −2 and high rate of 10C, a reversible energy storage capacity up to 190 mAh g −1 is achieved, which is ten times greater than achievable by commercial crystals with comparable dimensions.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
CARBON
·
2025
·
IF 11.6
Shijie Zhang,Jiajun Zheng,Changpeng Lv,Di Lan,Qingfeng Tian,Zhenguo Gao,Siyuan Zhang,Zhiwei Zhao,Shichang Cai,Guanglei Wu
The incorporation of a built-in electric field (BIEF) in nanocomposites has been well-recognized as a mainstream approach for enhancing the interface polarization. Nevertheless, the effect of sole BIEF on the dielectric loss is insufficient, and its combination with other loss mechanisms is necessary to achieve optimized electromagnetic wave performances. Herein, the nano carbon hybrids with Cu–ZnO Schottky BIEF with abundant defects were designed and derived through an etching and ligand exchange process, which involved the conversion of CuZn-BTC into a bimetallic ZIF structure. The conversion process effectively controlled the morphologies and induced a significant density of defects in the derivatives, thereby imparting diverse electrical conductivities and dielectric properties to the composites. This was achieved through the modulation of the cell volumes of Cu–ZnO polycrystals, the oxygen vacancies in ZnO, the nitrogen defects within the carbon matrix, and the creation of extensive heterointerfaces. The analysis indicated that the polarization relaxation dominated the dielectric loss. When the H 2 O/methanol in etching solvent was 3:7, the derived composite (S2) exhibited well matched impedance, and synergistic enhancement of BIEF effect and defect-induced polarization. Attributed to these merits, S2 achieved an ultra-wide effective absorption bandwidth (EAB) of 7.12 GHz at 2.3 mm. Notably, the EAB exceeded 6.0 GHz when the matched thickness ranged from 1.8 mm to 2.7 mm. This study can introduce a novel approach for the development of advanced absorbers based on the Schottky BIEF.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）