ChemNanoMat
·
2024
·
IF 2.6
Jiangnan Guo,Shuozhen Hu,Xinsheng Zhang,Shigang Sun
Utilizing carbon coated ferroelectric materials to introduce polarization-induced electric field (PIEF) stimulates research of electric field-assisted catalysts for various reactions. However, effect of PIEF on carbon coating mechanism has not been studied. Herein, tourmaline nanoparticles (TNPs) with spontaneous dipole moments were applied as the PIEF supplier and sucrose was utilized as the carbon precursor to synthesize carbon coated TNPs (TNP@SC) to uncover the influence of PIEF on the carbon coating and catalytic activity of Pd toward formic acid decomposition (FAD). PIEF enhanced the adsorption capacity of TNPs for the caramelized intermediate species and increased H+ concentration by facilitating water ionization. Polymerization of adsorbed caramelized intermediate species on TNPs was accelerated. Uniformly coated carbon layer with more defects, larger specific surface area, and higher porosity was coated on TNP. Such surface properties of the carbon layer were beneficial for strongly anchoring ultrafine Pd nanoparticles. Owing to the specific properties of carbon layer and existence of PIEF, Pd/TNP@SC exhibited higher FAD activity than the catalysts absent of PIEF. Stronger PIEF leaded to higher initial turnover frequency. This study provides guidance to supply electric field for catalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Guang Xia,Jiajia Ye,Zifan Wang,Juan An,Zhen Kong,Quanxiang Han,Mingyuan Pang,Haohao Zhang,Wensi Li,Jibin Song
The development of Lithium‑sulfur batteries (LSBs) is considerably limited by the shuttle effect and slow redox kinetics, which result in low cycle stability and decreased energy density. To enhance the energy density and accelerate the reaction kinetics of LSBs, a heterostructure consisting of FeP/Fe(PO 3 ) 3 nanoparticles was anchored on three-dimensional hierarchical porous carbon nanosheets using a simple soaking and carbonization method. This FeP/Fe(PO 3 ) 3 heterojunction, featuring an intrinsic built-in electric field (BIEF) effect and sulphiphilic characteristics, exhibited high catalytic efficiency in trapping lithium-polysulfides (LiPSs), regulated the nucleation of Li 2 S, and accelerated oxidation conversion reactions. The 3D porous hierarchical carbon nanosheets, derived from corn stalks, provide a large surface area and numerous pores, which effectively accommodate the considerable volume expansion of S 8 and Li 2 S during the electrochemical reactions, while also offering a conductive network to facilitate electron and Li + ion transport. As expected, the PCS/FeP/Fe(PO 3 ) 3 @S cathode demonstrated excellent electrochemical performance, delivering a discharge capacity of 663.8 mAh g −1 at a current rate of 5.0C. Additionally, the constructed Li S pouch cell achieved a high areal capacity of 11.0 mAh cm −2 and maintained an energy density of 450 Wh kg −1 with a sulfur mass loading of 9.0 mg cm −2 . This work provides a novel approach to developing stable, high-energy-density LSBs for practical energy storage applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Shijie Du,Xicai Lai
CH₃NH₃PbI₃ (MAPbI₃) perovskites have demonstrated significant potential in optoelectronic devices. However, the stability and performance of these applications are critically influenced by electric fields and light soaking effect (LSE). The mechanisms by which these factors affect the photoluminescence (PL) and time-resolved photoluminescence (TRPL) characteristics of MAPbI₃ thin films are not yet fully understood. In this study, we constructed a symmetric lateral electrode structure (ITO/MAPbI₃/ITO) to systematically analyze the impact of varying electric field strengths and LSE wavelengths on the PL and TRPL characteristics of MAPbI₃ thin films. Our experimental results reveal that bias voltage significantly influences carrier recombination processes and transfer rates. Both forward and reverse bias voltages exhibit similar effects on the symmetric lateral electrode ITO/MAPbI 3 /ITO structure. As the bias voltage increases, the steady-state PL intensity of MAPbI 3 films decreases, and the TRPL decay time shortens. Additionally, our studies on different LSE indicate that higher photon energy has a more pronounced impact on the TRPL lifetime of MAPbI 3 films. This research elucidates the mechanisms by which electric fields and LSE affect the photophysical properties of MAPbI 3 perovskite films, providing new insights for optimizing the performance of these materials in optoelectronic devices.
研究领域:
材料科学
·
光学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2014
·
IF 3.193
Liang Wang,Fuxing Xu,Xinhua Dai,Xiang Fang,Chuan-Fan Ding
A mesh-electrode linear ion trap (ME-LIT) mass analyzer was developed and its performance was primarily characterized. In conventional linear ion trap mass analyzers, the trapped ions are mass-selected and then ejected in a radial direction by a slot on a trap electrode. The presence of slots can strongly affect the electric field distribution in the ion trapping region and distort the mass analysis performance. To compensate for detrimental electric field effects, the slot is usually designed and fabricated to be as small as possible, and also has very high mechanical accuracy and symmetry. A ME-LIT with several mesh electrodes was built to compensate for the effects caused by slots. Each mesh electrode was fabricated from a plate electrode with a relatively large slot and the slot was covered with a conductive mesh. Our preliminary experimental results show that the ME-LIT could considerably diminish the detrimental electric field effects caused by slots, and increase the mass resolving power and ion detection efficiency. Even with 4-mm-wide slots, a mass resolution in excess of 600 was obtained using the ME-LIT. Mass resolution could be remarkably improved using mesh electrodes in ion traps with asymmetric electrodes. The stability diagram of the ME-LIT was mapped, and highly efficient tandem mass spectrometry was demonstrated. The ME-LIT was qualified as a LIT mass analyzer. The ME-LIT can improve the mass resolution and decrease the requirements of mechanical accuracy and symmetry of slots, so it shows potential for a wide range of practical uses.
研究领域:
分析化学
·
质谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Rui Chen,Na Wang,Yiwen Xie,Yayun Hu,Yuxia Song,Rong Wang
Photocatalytic inactivation, emerging as a novel bactericidal technique, is gaining increasing attention. While oxygen vacancies (OVs) and heterogeneous junction structures have been extensively investigated to enhance photocatalytic performance, the synergistic effect between the two remains largely unexplored. In this study, a Bi 2 S 3 @BiOCl-OV heterojunction structure enriched with oxygen vacancies as a promising photocatalyst was developed. Bi 2 S 3 @BiOCl-OV effectively improved photocatalytic properties due to the presence of oxygen vacancies and the unique structure of Z-type heterojunction. Further mechanism investigation shows that the unique heterojunction structure can induce the formation of internal electric field, the existence of oxygen vacancies can promote the generation of micro local electric field, and effectively promote the charge redistribution under the action of dual-electric field. Simultaneously, O 2 and H 2 O in the system are adsorbed by oxygen vacancies, and are activated by electrons to form the reactive oxygen species, thereby achieving the goal of killing microorganisms.
研究领域:
材料科学
·
环境科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wenjie Wang,Shan Ni,Yue Zhao,Yafeng Liu,Wang Yao,Jianrong Zeng,Congmei Chen,Huizhou Liu,Liangrong Yang
Uranium capture from aqueous solution is a hopeful project for the development of the nuclear industry, while the construction of adsorbents with high adsorption capacity, kinetics and selectivity remains a challenge. Herein, a feasible two-dimensional superstructure of Fe-based Mott-Schottky heterojunction (2D-Fe-N-C) is fabricated by an ice template and pyrolysis coupling strategy, which synergistically achieves the high-performance adsorption and reduction of UO 2 2+ from aqueous solution. The two-dimensional superstructure exposes more active sites and promotes ion transport, thereby increasing the adsorption capacity and accelerating the adsorption rate of the material. In addition, the internal electric field generated by the work function difference formed by each component of heterojunction contributes to improving the conductivity and speeding up the charge transfer. Meanwhile, the resulting charge space at the heterogeneous interface enhances the adsorption of uranium and the reduction reaction. Thus, the designed 2D-Fe-N-C demonstrates excellent adsorption and reduction properties for uranium, with extraction efficiency reaching up to 1348.0 mg/g and achieving adsorption equilibrium within 4 h. Moreover, 2D-Fe-N-C demonstrates high selectivity for various ions and exhibits superior adsorption performance in real water systems. This research offers a feasible strategy based on the synergistic effects of superstructure and interface engineering to achieve highly efficient selective adsorption of uranium.
研究领域:
材料科学
·
环境科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Wenliang Liu,Xiaohan Li,Yuqi Wang,Debo Yang,Zongzhen Guo,Mengfei Liu,Jiqian Wang
High-curvature multi-noble metallic heterostructures can effectively enhance the electrocatalytic hydrogen evolution performance by utilizing the synergism of tip-enhanced electric field effect and local electric field effect. Herein, we report a two-step synthesis strategy to obtain multi-branched high-curvature AgAuPt heterostructure, firstly amino acids-induced growth of Au branches on Ag nanocubes, and secondly L -AA reduction of H 2 PtCl 6 to incorporate tiny Pt nanoparticles on Au branches. The D -CAgAuPt results in a low overpotential of 38 mV to deliver a cathodic current density of 10 mA cm −2 , which is superior to commercial 20% Pt/C (46 mV). The strong electronic interactions between multi-noble metals intrinsically enhance the durability and stability of the catalysts. The intrinsic mechanism of promoting HER performance is investigated and revealed in-depth via the FDTD simulations and DFT calculations. In addition, D -CAgAuPt can also achieve efficient and stable hydrogen evolution in a proton exchange membrane electrolyzer, which has the potential for commercial practical application. This work designs a novel multi-branched high-curvature multi-noble metallic heterostructure, and fully provides insights into the generical and efficient enhancement of electrocatalytic HER performance of multi-noble metallic heterostructures.
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Jian Zhu,Hui Chang,Jian-Jun Li,Xin Li,Jun-Wu Zhao
The effect of silicon-coated gold nanoparticles with different gold core diameter and silica shell thickness on the fluorescence emission of CdTe quantum dots (QDs) was investigated. For gold nanoparticles with a diameter of 15 nm, silica coating can only results in fluorescence recover of the bare gold nanoparticle-induced quenching of QDs. However, when the size of gold nanoparticle is increased to 60 nm, fluorescence enhancement of the QDs could be obtained by silica coating. Because of the isolation of the silica shell-reduced quenching effect and local electric field effect , the fluorescence of QDs gets intense firstly and then decreases. The maximum fluorescence enhancement takes place as the silica shell has a thickness of 30 nm. This enhanced fluorescence from silicon-coated gold nanoparticles is demonstrated for sensing of Hg 2 + . Under optimal conditions, the enhanced fluorescence intensity decreases linearly with the concentration of Hg 2 + ranging from 0 to 200 ng/mL. The limit of detection for Hg 2 + is 1.25 ng/mL. Interference test and real samples detection indicate that the influence from other metal ions could be neglected, and the Hg 2 + could be specifically detected.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Chaorui Xue,Ruizhi Xue,Ruirui Huang,Xiangqian Fan,Huinian Zhang,Wenjing Zheng,Ying Li,Ning Li,Qing Chang,Shengliang Hu
Interfacial solar driven water evaporation (ISDWE) technology has been widely studied to desalinate seawater in aiming to alleviate the scarcity of clean water. In this paper, the ISDWE performance of Ti mesh was enhanced by anodized TiO 2 nanotube film and applied voltage, and the water evaporation rate increased from 1.20 kg•m −2 •h −1 to 2.48 kg•m −2 •h −1 . Due to hydrophilic and nanoporous nature of TiO 2 nanotube film, the solar absorptivity, wettability of Ti mesh was improved, the water evaporation enthalpy was reduced, and the water evaporation rate reached 1.98 kg•m −2 •h −1 . For the superior ISDWE performance with applied voltage, electrothermal effect and internal electrical filed were proved to be contributing factors. The solar irradiation can enhance the electrothermal effect for the semiconducting nature of TiO 2 . The internal electrical field can optimize the solar absorptivity and water evaporation enthalpy through doping TiO 2 and breaking water clusters. Moreover, the applied voltage also increased the salt-resistance property of Ti mesh coated with TiO 2 nanotube film. When increasing NaCl concentration, stable water evaporation rate was attainable under 1.2 V, whereas continuous deceleration of water evaporation occurred without external voltage. Therefore, our study provides strategies for achieving high efficient and salt-free seawater desalination by ISDWE technology.
研究领域:
材料科学
·
能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jin Li,Xia Long,Juexian Cao,Yong Hu
Direct monitoring of chemical reactions under external thermal control at the single-molecule scale remains highly challenging. Herein we report the first example of in-situ label-free single-molecule detection of a thermal-reversible Diels-Alder (DA) reactions using the scanning tunneling microscopy break junction (STM-BJ) technique equipped with a thermocouple mounted under the substrate with feedback control. The initial and final conductance states in single-molecule junctions based on the reaction can be reversibly switched in-situ between two different temperature levels. Furthermore, quantitative statistical analysis of the single-molecule reaction dynamics reveals that orientated external electric fields can selectively accelerate the forward DA reaction more than three times while having no impact on the reverse reaction. This finding emphasizes the potential of electric fields in selectively manipulating chemical reactions. The combined theoretical calculations suggest that the applied electric fields stabilize the dipole of the transition state and therefore reduce the energy barrier of the forward reaction. The integration of reversible reactions into nanocircuits not only provides an efficient strategy to manipulate chemical reactions but also offers new opportunities for designing functional molecular-scale devices such as transistors and switches.
研究领域:
纳米科学
·
化学
·
物理化学
·
分子电子学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 101
·82789-82799
·
IF 3.84
Yudi Guo,Dongyan Tang,Erqing Zhao,Zaiqian Yu,Haitao Lv,Xinyu Li
Effective surface fluorine enrichment has great potential application value for superhydrophobic electrospun films, which has presented a challenge to researchers. The aim is expected to be achieved by electrospinning functional polymers with controlled structure based on the polarization characteristics of functional groups in polymer chains and their directional ordering induced by an electric field. Herein, an amphiphilic graft copolymer of poly(methyl methacrylate-ran-hydroxypropyl acrylate)-graft-poly(dodecafluoroheptyl methacrylate) (PMMA-r-PHPA-g-PDFMA) was synthesized by the combination of free radical polymerization and atom transfer radical polymerization (ATRP). Superhydrophobic fibrous films with high surface fluorine atomic content of 29.1% and even up to 34.8% were fabricated by eletrospinning the resultant fluoropolymer. It is concluded that the electric field can drive the surface segregation of positively charged fluorinated groups and bulk segregation of negatively charged –OH groups, thus contributing to the effective surface fluorine enrichment, which was confirmed by XPS results. Additionally, we also found that the superhydrophobicity of electrospun films has no apparent dependence on fibre morphologies. The variation in the surface wettability can be attributed to the difference in surface compositions obtained by changing the applied electric field strength and solvents. This research would present potential application prospects in fabricating high surface fluorinated superhydrophobic electrospun fibres or novel surface functionalized electrospun fibres.
研究领域:
材料科学
·
高分子化学
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Ke Pei
Ferroelectric organic field-effect transistor (Fe-OFET) memory devices exhibit low power consumption, low cost and good flexibility, which are indispensable to next generation flexible and wearable memory devices. However, up until the present, the ferroelectric materials used in Fe-OFETs have been limited to ferroelectric polymers, i.e. poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)], and suffer from large surface roughness and high-risk of depolarization. This work integrates a new two-dimensional CuInP 2 S 6 crystal into Fe-OFET, which can introduce excellent ferroelectric property due to its single crystalline smoothness and noncentrosymmetric crystal structure. Meanwhile, the high-mobility rubrene crystal is selected as the channel material to construct rubrene/CuInP 2 S 6 organic/inorganic van der Waals heterojunctions . Associated with synergetic effect of single-crystalline nature of the heterojunction and atomically flat/defect-free interface, the memory devices possess a high programming speed of 0.5 s and long retention time of 10 4 s with a current ratio larger than 10 3 . Furthermore, the performance of flexible devices is also demonstrated, including a programming/erase cycle of 1000 with a current on/off ratio approaching 10 3 , data retention time of 10 4 s with a current on/off ratio of 10 3 and a current on/off ratio maintained at 10 2 even after 100 bending cycles under a bending radius of 25 mm, which are qualified for memory buffer usage or short-term data storage especially when they are integrated with other flexible electronics. The proposed configuration of memory transistors using organic/inorganic heterojunctions provides a rational design of device structure toward flexible Fe-OFET non-volatile memory applications.
研究领域:
材料科学
·
凝聚态物理
·
微电子学
·
纳米科技
·
柔性电子学
·
半导体器件
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）