JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Johar Zeb,Shuai Zhang,Muhammad Bilal Ahmed Qureshi,Manas Kumar Mandal,Qunhui Yuan,Wei Gan
Photoinduced intra and intermolecular charge transfer processes are vital in the solar energy conversion system. This research compared the photoinduced charge transfer processes of 1-aminoanthraquinone (AAQ) and 1,5-diaminoanthraquinone (DAAQ) molecules in ethanol using steady-state and transient absorption spectroscopic techniques, along with density functional theory (DFT) methods. The results revealed that AAQ shows greater intramolecular charge transfer (ICT) than the intermolecular charge transfer process. On the other hand, DAAQ, which has a lower solubility in ethanol and exhibits strong π-π stacking, displays higher intermolecular charge transfer processes than AAQ alongside its ICT process. The lifetimes for ICT and intersystem crossing (ISC) are shorter for DAAQ than AAQ molecules, representing their fast ICT and ISC processes. This work provides a comprehensive insight into the photoinduced intra- and intermolecular charge transfer processes of these two molecules, explaining their respective suitability as additives in photovoltaics and other optoelectronic devices due to their photoinduced charge transfer processes and structural planarity.
研究领域:
物理化学
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材料科学
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光化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 20
·8101-8108
·
IF 8.067
Meiling Xu,Chaomin Gao,Shan Yao,Shubo Sun,Lina Zhang,Kui Li,Xin Cheng
Facilitating the efficient separation of charge carriers is vitally crucial to achieving highly effective photocatalytic intermediate water splitting without any sacrificial reagents in pure water. Herein, the directional modulation separation of charge carrier strategy is proposed for Zn0.5Cd0.5S based on MOF-derived Co@NC and Co–Pi serving as dual charge transfer materials. The Co@NC acts as the electron transporting material to capture electrons and Co–Pi serves as the hole transporting material to extract holes, achieving the efficient separation of charge carriers and dramatically enhancing the photocatalytic performance. Moreover, the improved specific surface area can also provide more abundant active sites. The optimized Co@NC/Zn0.5Cd0.5S/Co–Pi sample achieved yields of H2 and H2O2 of up to 613.8 and 592.7 μmol h−1 g−1 in pure water, which are 13.2 and 14.4 times higher than that of pristine Zn0.5Cd0.5S, accompanied by a notable apparent quantum efficiency of 2.73% at 420 nm and the longest photocatalytic stability for 90 h. This work illustrates the importance of charge carrier separation to the photocatalytic performance and paves the way for designing highly efficient photocatalytic systems without sacrificial reagents.
研究领域:
材料科学
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能源化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
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2025
·
IF 7.7
Xianhua Huan,Bingbing Hu,Zhiwen Ji,Chao Gao,Fusheng Zhou,Jiahe Yu,Bin Du,Yushun Zhao
Epoxy composites with flame-retardant fillers are key electrical insulation materials for dry-type high-voltage (HV) transformers, but the ionic structure nature of the flame-retardant fillers can lead to the deterioration of the insulation performance, limiting the reliability of HV power systems. This study systematically examines how flame-retardant filler introduction and interface structure evolution impact charge transport within composites, aiming to refine the design principles of flame-retardant electrical insulation materials. Composites with uniformly dispersed fillers and ideal interfacial bonding with the matrix exhibit improved resistivity (1.41 × 10 16 Ω cm), attributed to the dense cross-linked network that limits impurity ion movement. More importantly, the behavior of space charge accumulation and dissipation within the composites indicates that the interfacial structure affects the internal energy level distribution, thereby influencing charge carrier transport characteristics. By optimizing the interfacial structure, the suppression of electrode charge injection and reduction of electric field distortion (from 15.1 % to 8.5 %) enhance the electrical insulation reliability of epoxy composites. These findings deepen the understanding of structure-property relationships in epoxy composites, offering critical insights for designing advanced flame-retardant HV electrical insulation materials.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 8
·3666-3674
·
IF 3.5
Amir Said,Guanjie Chen,Guanyun Zhang,Dexin Wang,Yanshu Liu,Fangfang Gao,Guo Wang,Chen-Ho Tung,Yifeng Wang
Titanium-oxide clusters (TOCs) are well-defined molecular models for TiO2 materials and provide the opportunity to study the structure–activity relationships of TiO2. Here, we report a new Pb-doped TOC, Ti12Pb2, which resembles a two-layer decker of the {TiTi6} structural units of rutile TiO2 with two Ti4+ ions replaced by two Pb2+ ions. Its electronic structure, photoresponse, and photocatalytic performances were investigated and compared with those of the Ti14 cluster, which is isostructural to Ti12Pb2. Our results indicate that Pb2+ does not affect the electronic structure, but it greatly enhances the photocatalytic activity by improving the charge-separation and interfacial charge-transfer properties of the TOC. The successful synthesis of Ti12Pb2 highlights the roles of closed-shell heterometal ions in the construction of new TOCs. Our mechanism may be an inspiration for understanding the structure–activity relationships of closed-shell heterometal-doped TiO2.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2022
·Vol. 71
·期 11
·1257-1266
·
IF 3.213
Yujia Fan,Ting-Ting Li,Wankai Ge,ChingWen Lou,Jia-Horng Lin
A two-step strategy is used to produce micro–nano composite filters that are flexible and exhibit charge recovery. Polytetrafluoroethylene (PTFE) electret powders are incorporated during the process to provide melt-blown micro–nano membranes with good charge recovery and improved fiber fineness. Then the advantages of the nanofiber membrane are utilized to load the PTFE suspension onto the surface of melt-blown microfiber membranes to construct a composite filtration membrane with a micro–nano structure, to achieve high-efficiency and gradient filtration. The test results indicate that the gradient filtration composite membranes exhibit 100% filtration efficiency against 2.5 μm particles, 94.96% filtration efficiency against 0.200–2.5 μm particles and 95.39% filtration efficiency against 0.200–4.595 μm particles, which is 232.02% higher than that of polypropylene membranes. In addition, the gradient filtration composite membranes have a pressure drop that is only 86 Pa and a quality factor of 0.0358 Pa −1 . Featuring excellent electret property and charge recovery rate, the gradient filtration micro–nano composite membranes are outstanding filters that have high filtration efficiency, low pressure drop, stable surface potential and excellent thermal stability. © 2022 Society of Industrial Chemistry.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Jiangping Jing,Zhuoyuan Chen,Chang Feng,Li Ma,Jian Hou,Likun Xu,Mingxian Sun
The application of graphitic carbon nitride (g-C3N4) in the field of photoelectrochemistry is booming due to its visible light response, stability, low cost, and environmental compatibility. However, the modulation of the photogenerated charge carriers in the g-C3N4 photoelectrode is still a challenge, especially for the control of the charge transfer direction and the improvement of charge migration rate. In this work, PEDOT was in situ deposited on the surface of g-C3N4 to modify the transfer process of the photogenerated holes. The band structure was investigated based on the valence band and work function. The charge transfer properties were characterized by analyzing the processes of hole transfer, separation, and depolarization. PEDOT is found to play two roles: one is to act as a semiconductor material to form a heterojunction with g-C3N4, regulating the charge transfer direction and promoting the separation efficiency of the photogenerated charge carriers; the other one is to act as a hole transmission medium, promoting the migration and depolarization processes of the photogenerated holes. Therefore, the photoelectrochemical performance of g-C3N4 is greatly improved, which is further verified by the enhanced photoinduced cathodic protection performance, whether with the assistance of hole sacrificial agents or not.
研究领域:
材料科学
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光化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Han Wu,Xuguang Liu,Wen Li,Shenglin Kang,Boyu Zhu,Lijun Yang,Ruijin Liao,Zhenlian An,Jiyu Wang
Triboelectric polymer with high charge density and stable output performance is the cornerstone to promote the urgent commercialization of triboelectric nanogenerators (TENGs) for various applications. In this work, the facilitated surface manipulation strategy based on direct fluorination technique is applied for triboelectric polymers to boost their performance. The Polydimethylsiloxane film as experimental samples is treated with different fluorination temperatures and times, whose characterization results demonstrated significant changes in both physical and chemical properties. The F atoms substitution in the fluorination process yields strong electron-withdrawing groups on the molecular, and a μm level fluorinated layer is formed with nanostructured surface . In the atmosphere environment, the fluorinated sample-based contact separation TENG attains a maximum charge density of about 150 μC/m 2 , an enhancement of 385% compared to the original sample. Meanwhile, the TENG features favorable output stability with output charge retention of about 87% in a high humidity environment and realizes sustainable operation in the long term. The enhanced charge density is attributed to the fluorinated molecular with negative electrostatic potential and lower energy level of the lowest unoccupied molecular orbital , while a rougher and denser physical structure with favorable humidity resistance allows to maintain the charge stability. Finally, the manipulation strategy for elevating the electrification performance of triboelectric polymers is summarized in terms of both elemental composition and physical structure. This work represents a feasible approach to manipulate the triboelectric polymer on surface that can be large-scale preparation and utilization, which is dedicated to guiding high performance TENGs employment towards commercialization and practical application in the near future.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2018
·Vol. 11
·期 3
·1111-1122
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IF 7.233
Chunmei Li,Zhihui Chen,Weiyong Yuan,Qing-Hua Xu,Chang Ming Li
Photoelectrochemical (PEC) water splitting represents a promising strategy to convert solar energy into chemical energy in the form of hydrogen, but its performance is severely limited by the sluggish water oxidation reaction. Herein, for the first time, we report the direct assembly of an ultrathin, uniform, and dense layer of Co3O4 on wormlike nanostructured hematite (WN-α-Fe2O3) to form a large-area and high-density WN-α-Fe2O3@Co3O4 core–shell nanoarray via in situ hydrothermal growth followed by calcination, in which the electrostatic force between WN-α-Fe2O3 and the reactants, pH- and temperature-controlled structures of WN-α-Fe2O3, and ultralow nucleation rate of Co3O4 precursors all play critical roles. The obtained heteronanostructure array shows a photocurrent density of 3.48 mA cm−2, which is 4.05 times higher than that of pristine WN-α-Fe2O3 (0.86 mA cm−2), an onset potential of ∼0.62 V, 60 mV lower than that of α-Fe2O3 (∼0.68 V), and a photoconversion efficiency of 0.55%, 3.93 times higher than that of WN-α-Fe2O3 (0.14%). This is among the highest performances reported for Fe2O3-based photoanodes for water splitting. It is discovered that the Co3O4 shells can significantly enhance the charge separation, accelerate the charge transport and transfer, and reduce the charge transfer resistance from the photoelectrode to the electrolyte for a fast water oxidation reaction, thereby greatly promoting the PEC water oxidation performance of pristine WN-α-Fe2O3. This work not only creates a novel low-cost and Earth-abundant WN-α-Fe2O3@Co3O4 photoelectrode with superior PEC water oxidation performance and provides scientific insights into the enhancement mechanism, but also offers a general strategy for the in situ growth of water oxidation catalysts on various photoelectrodes with 3-D complex geometries for PEC water splitting.
研究领域:
材料科学
·
能源转换与存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Materials Today
·
2025
·
IF 22
Zekun Li,Aifang Yu,Jitao Liu,Yuanhong Shi,Wenwen Hu,Zhong Lin Wang,Junyi Zhai
The attainment of outrageous electrode charge density in triboelectric nanogenerators (TENGs) hinges on substantially strengthening the charge-carrying capacity of triboelectric materials. Here, a universal cistern model is first proposed to derive essential prerequisites for reaching this destination. According to the deduction, surface functionalized BaTiO 3 (BTO) nanoparticles and poly(ether-ether-ketone) (PEEK) are exploited to construct interfaces from nanoscale to macroscopic scale in poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) to immensely bolster its 3D charge confinement capability. Subsequently, through the collaboration of a charge planting module (CPM), the charge hindrance effect is efficaciously attenuated, enabling the modified P(VDF-HFP) to confine more charges. As a consequence, the transferred charge density (TCD) of the TENG utilizing the modified P(VDF-HFP) reaches 600 μC/m 2 , a 20-fold increment over the TCD of the unmodified P(VDF-HFP). Meanwhile, the charge de-trapping of the modified P(VDF-HFP) also reveals that the CPM not only elevates the surface charge of the dielectric but also raises the space charge of the dielectric, indicative of a synergistic effect between the various tactics. Furthermore, the model and methodology we have crafted can be broadly applied to refine a broad spectrum of triboelectric materials, potentially propelling forward the advancement of highly charged triboelectric dielectrics.
研究领域:
材料科学
·
纳米技术
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2023
·
IF 18.9
Peng Yang,Yuxiang Shi,Xinglin Tao,Zhaoqi Liu,Xuanyi Dong,Zhong Lin Wang,Xiangyu Chen
The triboelectric charge density is the core parameter of triboelectric nanogenerators (TENGs), which is usually suppressed by charge escaping. This work proposes a compensation method for suppressing charge escaping on triboelectric polymer by inducing radical ion transfer. Radical anions are injected onto the polytetrafluoroethylene (PTFE) to prepare ionized-PTFE (I-PTFE), which serves as a positive component to fabricate TENG together with fully charged dielectrics. In open air, the unprecedented charge density of 525 μC m −2 and 1237 μC m −2 are respectively realized with contact-separation and sliding mode TENG, which are much higher than that for the calculated threshold of air breakdown. The selective ion transfer on contact interface is demonstrated by secondary ion mass spectrometry, which accounts for the compensation of charge escaping. Hence, a strategy for maintaining ultrahigh charge density in atmosphere is summarized. The coexistence and complementarity of electron and ion transfer can also elucidate the mechanism of contact electrification.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Youbo Nan,Xiutong Wang,Hui Xu,Yan Wu,Hui Zhou,Yanan Sun,Teng Yu,Yanliang Huang
Improving output performance is a key to develop triboelectric nanogenerator (TENG) applications. Herein, an improved melamine foam (MF) /MXene/Ecoflex@TiO 2 -TENG (FME@TiO 2 -TENG) based on the composite dielectric MF/MXene/Ecoflex@TiO 2 (FME@TiO 2 ) is developed after comprehensively considering charge generation, transport, trapping, and dissipation. A 3D MF framework with evenly dispersed MXene exhibits strong electronegativity , electrical conductivity , and a formation of a large number of micro-capacitances, which are advantageous for surface charge generation, transfer, and retention in the composite dielectric FME@TiO 2 . More importantly, dual functions of a TiO 2 nanotube array film, i.e., its high dielectric property and electron-trapping ability, are beneficial for output of electrical properties. A cathodic protection system powered by the FME@TiO 2 -TENG was designed to demonstrate its application potential in electrochemistry. Furthermore, a novel in-situ micro-electrolytic cell observation system using K 3 [Fe (CN) 6 ] as an indicator was designed to evaluate the cathodic protection effect. The results showed that the FME@TiO 2 -TENG could be used as an independent power source to provide electrochemical cathodic protection. This study provides a useful guidance for a development of the high-performance TENG composite dielectrics and promotes their practical application in the field of the electrochemical cathodic protection.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiuting Huang,Hongbo Gong,Guoqiang Wang,Weiye Hu,Weili Wang,Siqi Pan,Jing Xu,Guokun Liu,Zhongqun Tian
Surface-enhanced Raman spectroscopy (SERS) has been demonstrated as an ultrasensitive tool for various molecules. However, for the negatively charged molecules, the widely used SERS substrate [negatively charged Ag and Au nanoparticles (Ag or Au NPs (−)] showed either low sensitivity or poor stability. The best solution is to synthesize positively charged silver or gold nanoparticles [Ag or Au NPs (+)] with high stability and excellent SERS performance, which are currently unavailable. To this end, we revitalized the strategy of “charge reversal and seed growth”. By selection of ascorbic acid as the reductant and surfactant, the surface charge of Ag or Au NP (−) seeds is adjusted to a balanced state, where the surface charge is negative enough to satisfy the stabilization of the NPs (−) but does not hinder the subsequent charge reversal. By optimization of the chain length and electric charge of polyamine molecules, the highly stable and size-controllable uniform Ag NPs (+) and Au NPs (+) were seed-growth synthesized with high reproducibility. More importantly, the SERS performance of both Ag NPs (+) and Au NPs (+) achieved the trace detection of negatively charged molecules at the level of 1 μg/L, demonstrating an improved SERS sensitivity of up to 3 orders of magnitude compared to the previously reported sensitivity. Promisingly, the introduction of polyamine-capped Ag NPs (+) and Au NPs (+) as SERS substrates with high stability (1 year shelf life) will significantly broaden the application of SERS.
研究领域:
纳米技术
·
分析化学
·
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）