ChemSusChem
·
2023
·Vol. 16
·期 17
·e202300493
·
IF 8.4
Yong-Feng Shen,Meng-Meng Zhang,Dong Yan,Jia-He Lv,Tao Wu,Bin He,Wen-Cui Li
Graphical From petroleum coke : Soft carbon cathode with superb rate performance for dual-ion batteries is presented. In situ XRD and Raman show that PF 6 − anions form stage-1 graphite intercalation compounds in the surface region, and directly stage-2 in the bulk, skipping the conversion from stage-4 to stage-2 due to the benefit of surface effect. The improved reaction kinetics results in better rate performance than that of conventional graphite. Dual-ion battery is a new type of battery in which both anions and cations participate in the energy storage process. However, this unique battery configuration imposes high requirements on the cathode, which typically presents a poor rate performance due to the sluggish diffusion dynamics and intercalation reaction kinetics of anions. Herein, we report petroleum coke-based soft carbon as the cathode for dual-ion batteries, exhibiting a superior rate performance with a specific capacity of 96 mAh g −1 at a rate of 2 C and 72 mAh g −1 remained even at 50 C. In situ XRD and Raman demonstrate that the anions can directly form lower-stage graphite intercalation compounds during the charge process owing to the surface effect, skipping the long evolutionary process from higher to lower stage, thus significantly improving the rate performance. This study highlights the impact of the surface effect and provides a promising perspective for dual-ion 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
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Kangning Sun,Peizhuo Han,Changlin Yao,Yaning Zhao,Chuanchi Zhang,Yao Zhang,Jingke Jiang,Lei Wang
Molecules at the liquid/vapor interface have different properties, such as faster mobility and special packing structure, which can potentially affect crystal nucleation. However, the surface effect varies significantly among different small organic molecules and the underlying mechanism is still poorly understood. Herein, the effect of the surface on the crystal nucleation dynamics has been investigated in the glass-forming liquid molnupiravir (MPV) by measuring the crystal nucleation rates at the surface and in the bulk. It was found that the surface of the glass-forming liquid MPV could significantly enhance the nucleation rate by around six orders of magnitude without a polymorphic change. In comparison to water and acetaminophen with a surface enhancement factor of Js/Jv ≈ 105, the larger surface enhancement factor of MPV indicates a higher similarity between the nucleated crystal structure and the molecular packing at the surface. Our work enriches the surface-enhanced nucleation systems, which are beneficial to further understanding the stability of amorphous drugs.
研究领域:
材料科学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2025
·
IF 6.6
Fan Li,Yong-Feng Shen,Bin He,Wen-Cui Li
Dual-ion batteries are attracting much attention due to the joint participation of anions and cations in the energy storage process. However, this unique battery configuration imposes high demands on the cathode, which typically presents an inferior rate performance. Herein, we employ graphite in different microcrystalline sizes as cathodes, associated with high concentration electrolyte to construct sodium dual-ion batteries. The results of in-situ XRD and Raman evidence that the surface effect is enhanced by suitably small graphite microcrystals, where a greater surface involvement affords more electro-activated regions for the ions. Furthermore, the analysis of sputtering XPS confirms that the PF6- is accompanied by the co-intercalation of Na+ into cathodes by constructing the model of concentration effect, thus accelerating the kinetic process. In conclusion, the co-intercalation of PF6- together with Na+ is demonstrated under the influence of enhanced surface concentration effect in cathodes, and thus the cathodes exhibit a superior rate performance with a capacity of 103.6 mAh g-1 at a rate of 2 C and a rate retention of 94.8% even at 50 C. This work provides new insights to explain the mechanism of ion intercalation in dual-ion batteries and offers a perspective for the construction of high energy storage systems.
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
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
·
2022
·
IF 2.004
C. Zhang,Y. Wan,X.H. Liang,M.H. Rong,G.T. Ma,L. Li,C.H. Hu,Chengying Tang
Au–Co nanoparticles (NPs) were prepared by water-phase chemical reduction method with metal precursor. The samples were coated with silica by Stöber method and characterized by ultraviolet and visible spectrophotometer (UV–vis), transmission electron microscopy (TEM) to obtain the absorption spectrum , size, composition distribution of the nanoparticles. The melting behaviors of the prepared Au 8 Co 2 NPs and Au 6 Co 4 NPs were examined by differential scanning calorimetry (DSC). It was observed by DSC measurements that two endothermic effects existed in range of 700.0 K–1350.0 K, corresponding to the melting temperatures of the nanoparticles and the bulk Au–Co alloys, respectively. The surface tension, surface segregation and surface energy of Au–Co NPs of particle size and temperature were calculated by the Butler's equation. On the basis of the obtained experimental results and the Gibbs free energy contributed by surface effects of pure elements and alloys at nanoscale, the nanophase diagrams of Au–Co system with various sizes were optimized. It was indicated that the calculated nanophase diagrams were in good agreement with the experimental results. The calculated eutectic temperatures decreased with the decrease of the size.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 7
·1607
·
IF 3.1
Hang Li,Jiazhen He,Xiaoqian Wang,Qi Liu,Xuemin Luo,Mingwei Wang,Jinfeng Liu,Chengqi Liu,Yong Liu
As a direct band gap semiconductor, perovskite has the advantages of high carrier mobility, long charge diffusion distance, high defect tolerance and low-cost solution preparation technology. Compared with traditional metal halide perovskites, which regulate energy band and luminescence by changing halogen, perovskite quantum dots (QDs) have a surface effect and quantum confinement effect. Based on the LaMer nucleation growth theory, we have synthesized CsPbBr3QDs with high dimensional homogeneity by creating an environment rich in Br−ions based on the general thermal injection method. Moreover, the size of the quantum dots can be adjusted by simply changing the reaction temperature and the concentration of Br−ions in the system, and the blue emission of strongly confined pure CsPbBr3perovskite is realized. Finally, optical and electrochemical tests suggested that the synthesized quantum dots have the potential to be used in the field of photocatalysis.
研究领域:
材料科学
·
光电催化
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2012
·
IF 0.901
Fang WANG,Chenglu LIU,Zhiqiang ZHOU,Peiyun JIA,Jun LIN
YVO 4 :Eu nanocrystalline phosphors were successfully prepared at 400 °C in equal moles of NaNO 3 and KNO 3 molten salts. NaOH concentration and annealing temperature played important roles in phase purity and crystallinity of the nanocrystallines, and the optimum NaOH concentration and annealing temperature were 6:40 and 400 °C, respectively. The nanocrystallines were well crystallized with a cubic morphology in an average grain size of 18 nm. Upon excitation of the vanadate groups at 314 nm, YVO 4 :Eu nanocrystallines exhibited the characteristic emission of Eu 3+ , which indicated that there was an energy transfer from vanadate groups to Eu 3+ . Moreover, the influence of superficial effect, especially the dangling bonds on the structure and luminescent properties of the nanocrystallines was discussed in detail.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2021
·
IF 3.407
Pinhua Zhang,Wenhao Di,Kaifeng Xue,Guangliang Cui
Cu 2 O/ZnO heterostructure ordered nanoarrays were prepared with an in situ electrodeposition method for H 2 S detection in biological samples at room temperature. Based on this new material, a novel sensor was proposed, which exhibited good performances for sensitivity and selectivity for bio-H 2 S detection due to the surface/interface effects and long-range ordered structure. It was confirmed by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) that these good performances were mainly attributed to the conversion of Cu 2 O to metallic Cu x S on the surface of the ordered structure. In addition, the sensor had good portability due to its small size. Our results suggest that the Cu 2 O/ZnO heterostructure ordered nanoarrays are promising candidates for high-performance H 2 S sensors applied in disease diagnosis and environmental assessment.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jinming Shi,Yue Chang,Yuanshun Tang,Xuanbo Wang,Wenqing Yao,Zhenxing Yue,Badar Minhas,Jiangli Cao
Abstarct Ferrous titanate (FeTiO 3 ) nanoparticles with hexagonal disc structure were prepared by a simple hydrothermal method . The VSM results show that ferromagnetic-paramagnetic transition of FeTiO 3 caused by high temperature hydrogenation. The morphology and lattice structure of FeTiO 3 was characterized in detail by XRD , Raman, SEM and TEM . It was found that the magnetic transition of FeTiO 3 nanoparticles after hydrogenation could be attributed to the change of lattice structure and surface effect. Further research by XPS found that the high temperature hydrogenation treatment could cause the change of elemental valence states and oxygen vacancies concentration for FeTiO 3 . The weakening of double exchange interaction (Fe 2+ -O-Fe 3+ ) and the reduction of uncompensated surface spin were the main cause of the ferromagnetic-paramagnetic transition. This experiment would provide a new idea for regulating the magnetic property of materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Hongyu Yang,Zhenghua Tang,Wei Yan,Likai Wang,Qiannan Wang,Yongqing Zhang,Zhen Liu,Shaowei Chen
Peptide-capped nanoparticles represent a unique type of nanomaterials with emergent optical and electrochemical properties . Herein, a series of peptide capped palladium nanoparticles have been prepared and employed as highly efficient catalysts for oxygen electroreduction. The peptide sequence was tuned by substituting amino acid residues at specialized positions, and strong surface effects were observed between the peptide sequence and the electrocatalytic activity. The findings corresponded well with the previously reported C C coupling catalytic reactions, indicating that the residue-specific binding effects but not the overall binding strength governed the electrocatalytic activity. The results may shed light on the rational design of bio-inspired nanomaterials with optimized electrocatalytic properties.
研究领域:
材料科学
·
电化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 13
·8444-8451
·
IF 12.732
Qi Xue,Yue Zhao,Jingyi Zhu,Yu Ding,Tiaojiao Wang,Huiying Sun,Fumin Li,Pei Chen,Pujun Jin,Shibin Yin,Yu Chen
Co-regulation of the crystal plane and composition is a powerful strategy to effectively enhance the catalytic properties of nanomaterials. Herein, high-quality PtxRu nanocubes (PtxRu-NCs) with an adjustable composition and exposed (100) planes are synthesized by a simple hydrothermal method. For the ammonia electrooxidation reaction (AOR), Pt6Ru-NCs show obviously higher mass activity (192 mA mgPt−1) and specific activity (1.02 mA cm−2) than other PtxRu-NCs, Pt-NCs and commercial Pt nanocrystals. Density functional theory calculations demonstrate that the Pt6Ru (100) plane is more energetically favourable for the AOR than the Pt (100) plane due to the stronger binding of *NH2 and *NH. For the hydrogen evolution reaction (HER), the optimized Pt6Ru-NCs also deliver the smallest overpotential (37.6 mV) at 10 mA cm−2. The high activity of bifunctional Pt6Ru-NCs for both AOR and HER can be attributed to the crystal surface effect and Pt-Ru bimetallic interactions. A symmetric ammonia electrolyzer constructed here with Pt6Ru-NCs as the cathode and anode only requires 0.72 V electrolysis voltage for electrochemical hydrogen production.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2011
·Vol. 21
·期 18
·6736-6741
·
IF 5.101
Xiwei Zhang,Jiansheng Jie,Zhi Wang,Chunyan Wu,Li Wang,Qiang Peng,Yongqiang Yu,Peng Jiang,Chao Xie
Single-crystal p-type ZnSe nanowires (NWs) with zinc blende structure and [21–1] growth direction were synthesized by using bismuth (Bi) as dopant via a thermal co-evaporation method. The ZnSe : Bi NWs showed evident p-type conductivity with hole concentration up to 4.1 × 1018 cm−3 after the acceptor activation. Negative photoconductivity was first investigated in the p-ZnSe NWs, i.e., the conductivity of the NWs under light was dramatically lower than that in the dark. Surface effects arising from oxygen absorption and photo-desorption were suggested to be responsible for this. By using Al as the Schottky gate, high-performance nano-metal-semiconductor field-effect transistors (nanoMESFETs) were constructed, and measurements on the Al/p-ZnSe NW Schottky diode also revealed the bias-dependent photoresponse. It is expected that the p-type ZnSe : Bi NWs will have great potential in nano-optoelectronic applications.
研究领域:
材料科学
·
半导体物理
·
纳米技术
·
光电子学
·
凝聚态物理
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 52
·1905451
·
IF 10.856
Lijun Ji,Mindong Gong,Tong Xu,Jun Gu,Xu Jiang,Taotao Liang,Yu Chen,Qingren Liu
The interactions of ions and molecules with material surface are highly dependent on the surface properties of the material. Therefore, the distribution of ions or molecules near the material surface may be affected by the surface properties. This phenomenon can be significant enough for controlling the structure of a material synthesized in the sub-micrometer scale confinement space of a template. This work confirms that inverse opals are perfect templates for offering confinement space, while their different surface properties can strongly affect ion and block copolymer distribution in the confinement space. This surface effect principle can be used for the controlled synthesis of colloids with complex composition. As an example, four kinds of mesoporous magnetic bioactive glass colloids with ordered mesopores, core–shell structure, open surface pores, or disordered mesopores are prepared by using polystyrene and carbon inverse opal templates. This work reveals that inverse opal templates possess great advantage in controlled synthesizing colloidal structures due to their surface effect on ions and molecules and confinement space.
研究领域:
生物材料学
·
纳米医学
·
组织工程
·
药物递送
·
生物矿化
·
胶体化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）