MOLECULES
·
2023
·Vol. 28
·期 4
·1815
·
IF 4.6
Bin Tang,Wei Yin,Qibiao Wang,Long Chen,Heyong Huo,Yang Wu,Hongchao Yang,Chenghua Sun,Shuyun Zhou
High-resolution neutron radiography provides novel and stirring opportunities to investigate the structures of light elements encased by heavy elements. For this study, a series of Gd2O2S:Tb, F particles were prepared using a high-temperature solid phase method and then used as a scintillation screen. Upon reaching 293 nm excitation, a bright green emission originated from the Tb3+luminescence center. The level of F doping affected the fluorescence intensity. When the F doping level was 8 mol%, the fluorescence intensity was at its highest. The absolute quantum yield of the synthesized particles reached as high as 77.21%. Gd2O2S:Tb, F particles were applied to the scintillation screen, showing a resolution on the neutron radiograph as high as 12 μm. These results suggest that the highly efficient Gd2O2S:Tb, F particles are promising scintillators for the purposes of cold neutron radiography.
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高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Jiangli Feng,Chenhui Wang,Hailin Lei,Songtao Liu,Jing Liu,You Han,Jinli Zhang,Wei Li
Lithium cobalt oxide (LiCoO 2 ) is proverbially employed as cathode materials of lithium-ion batteries attributed to the high theoretical capacity, and currently, it is developing towards higher cut-off voltages in the pursuit of higher energy density. However, it suffers from serious structural degradation and surface side reactions, in particular, at the voltage above 4.60 V, leading to rapid decay of the battery life. Taking into account the desirable oxygen buffering property and the fast ion mobility characteristic of cerium oxide fluoride, in this work, we prepared Ce & F co-modified LiCoO 2 by using the precursors of Ce(NO 3 ) 3 ·6H 2 O and NH 4 F, and evaluated the electrochemical performance under voltages exceeding 4.60 V. The results indicated that the modified samples have multiphase heterostructure of surface CeO 2− x and unique Ce O F solid solution phase. At 3.0–4.60 V and 25 °C, the preferred sample LCO-0.5Ce-0.3F has a high initial discharge specific capacity of 221.9 mA h g −1 at 0.1 C, with the retention of 80.3% and 89.6% after 300 cycles at 1 and 5 C, comparing with the pristine LCO (56.4% and 22.6%). And at 3.0–4.65 V, its retention is 64.0% after 300 cycles at 1 C, versus 8.5% of the pristine LCO. Through structural characterizations and DFT calculations, it suggests that Ce 4+ & F − co-doping suppresses the H3 to H1/3 irreversible phase transition, stabilizes the lattice structure, and reduces the redox activity of the lattice oxygen by modulating the Co 3 d –O 2 p energy band, consequently improving the electrochemical performance of LiCoO 2 at high voltages.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 10
·14534-14545
·
IF 4.672
Yicen Liu,Bing Zhu,Yan-gai Liu,Hang Zhao,Zekun Wang,Liming Wu,Xi Zhang,Jian Chen
Summary In this study, we synthesized a bimetal hydroxyl fluoride, Co 0.6 Zn 0.4 (OH)F, with an overlapping nanoneedle structure using a simple hydrothermal method. The synthesized Co 0.6 Zn 0.4 (OH)F was used as a new electrode material to study its electrochemical performance. Because of the synergy between Co and Zn and the high ionicity of fluorides, the Co 0.6 Zn 0.4 (OH)F electrode exhibited a discharge capacity of 1355.5 mAh g −1 during the first charging and discharging cycle. After 400 cycles at a current density of 2 A g −1 , the Co 0.6 Zn 0.4 (OH)F electrode showed an excellent specific capacity of 756 mAh g −1 . The Co 0.6 Zn 0.4 (OH)F electrode also exhibited an excellent capacitance contribution rate, indicating good rate performance. In addition, the hydroxyl and oxygen vacancies in the electrode material promoted the lithium/dilithium reactions. Therefore, Co 0.6 Zn 0.4 (OH)F is an excellent lithium storage material with high rate; thus, it has a certain potential application value in the future.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 7.9
Li-Qian Cheng,Yi Gong,Jiangyun Ding,Jingye Pan,Kai Chen,Xuxia Hao,Yu Dai,Min Jiang,Xinyuan Xie,Fan Yang,Ruiping Liu
High-manganese-to-iron-ratio lithium manganese iron phosphate (LMFP) is a promising candidate for next-generation electric vehicle cathodes due to its high energy density, low cost, and safety. However, its poor cycling reversibility, especially at elevated temperatures, has limited its practical application, which is mainly due to the Jahn-Teller effect and Mn-ion dissolution. Ion doping is a commonly used modification method. Herein, in this work, a novel V/F co-doping and Mn 2+ capture membrane coated with CNT-doped hydroxyapatite (HAP-C) were employed to modify LMFP. The V/F co-doped LMFP showed enhanced structure stability during cycling tests compared to LMFP, and the capacity retention rate increased to 89.5 % after 300 cycles at 1C/1C. Meanwhile, the Mn 2+ -capturing separator further protected the anode stability by preventing the deposition of dissolved manganese ions. Due to these combined properties, the doped cathode battery using the HAP-C modified separator exhibited less manganese deposition on the anode. After 300 cycles at 1C/1C, 25 °C, the capacity retention rate further improved to 96.7 %, and after 300 cycles at 0.5C/0.5C, 45 °C, the capacity retention rate increased to 84.0 %, demonstrating outstanding cycling stability. This comprehensive strategy provides a basis for developing high-energy-density and long-cycle-life lithium-ion battery.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 79
·41968-41975
·
IF 3.708
Xiaona Han,Zhen Zhao,Yunlong Xu,Dong Liu,Huang Zhang,Chongjun Zhao
The F-doped and carbon coated Li4Ti5O12−xFx/C (LTOF/C) composite anode materials are synthesized via a conventional solid-state reaction with lithium citric acid as the conductive carbon source, and LiF as the fluorine source. The structure and electrochemical properties of the LTOF/C materials are investigated and the effects of carbon coating and F ion doping on the performance of as-prepared materials are discussed. Under a potential range from 0.01 to 2.5 V, LTOF/C exhibits better reversibility and higher cyclic stability compared with LTO and LTO/C, especially at high current rates. The initial specific discharge capacity is 325.6 mA h g−1 at a current density of 170 mA g−1, and remains about 165 mA h g−1 over 1000 cycles when the current density increases to 850 mA g−1. The main factors influencing the excellent performances should be attributed to the cooperation of the F-doping and carbon-coating, which can increase the amount of mixed Ti3+/Ti4+, leading to improved ionic conductivity and electron conductivity in LTO at the same time.
研究领域:
材料科学
·
电化学
·
储能技术
·
纳米材料
·
锂离子电池
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高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2023
·
IF 2.3
Qiang Ling,Zhi-hao Wang,Han-wen Liang,Rong Wu,Zhao Lei,Zhi-gang Zhao,Qing-ping Ke,Rui-lun Xie,Xiang-chun Liu,Ning Zhang,Ping Cui
We reported an experimental and theoretical study on the promotion role of F doping in the improved catalytic performance of fluorinated graphene(F-GO) for ammonium perchlorate (AP) pyrolysis. F-GO was prepared by using graphite oxide (GO) as carbon sources and CF3COOH as fluorinating agent. Compared with other samples, the F-GO-180 with the highest F doping amounts, more C-F semi-ionic and C-F covalent bond amounts exhibit superior catalytic performance, as 10 wt% of catalyst added in AP, the exothermic peak temperature proceeded in just one step was even lower than the HTD peak temperature for pure AP and the released apparent specific heat of the thermal decomposition of AP catalyzed by F-GO-180 is 4261.2 J/g, which is almost sevenfold of that of pure AP (603.5 J/g). The doping of F atoms in graphene increased surface defects and the content of C-F semi-ionic and C-F covalent bond amounts of F-GO, which provided more active sites during the thermal decomposition of AP. The molecular simulation calculation results further confirmed that the F doping could react with the defect structure of graphene to form more C-F semi-ionic and C-F covalent bond, which could act as catalytic active sites and facilitate the electron transfer ability of the graphene to promote the formation of free radicals in the reaction.
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高影响因子
Journal of Energy Chemistry
·
2026
·
IF 15.6
Fengyu Wu,Fenyang Tian,Menggang Li,Longyu Qiu,Xue Ren,Lin He,Guanghui Han,Tongbo Zhang,Xinyu Wang,Jie Sheng,Weiwei Yang,Yongsheng Yu
Overcoming the mismatched adsorption energies is critical for efficient alkaline hydrogen electrocatalysis, yet modulating the strong Ru–O covalency without compromising structural integrity remains a key challenge. Herein, we address this by introducing ionic Ru–F bonds into selected regions of RuO 2 via tailored chemical bond engineering for enhanced hydrogen evolution and oxidation reactions (HER/HOR). Using fluorine‑doped amorphous RuO 2 (F‑RuO 2 ) nanosheets as a model catalyst, we find that electrons around fluorine atoms can become highly localized, forming ionic-character Ru–F bonds. This design results in a low HER overpotential of 32 mV at 100 mA cm −2 and delivers a high HOR diffusion-limiting current density of 2.98 mA cm −2 , positioning F-RuO 2 among the best‑performing Ru‑based electrocatalysts yet reported. Moreover, the anion-exchange-membrane water electrolyzer with F-RuO 2 can maintain a cell voltage of 1.60 V at 100 mA cm −2 for over 300 h with negligible degradation. In-situ spectroscopic analysis and density functional theory calculations reveal that the formed Ru–F bonds weaken Ru–O covalency and moderately lower the Ru oxidation states, optimizing hydrogen‑intermediate adsorption toward the ideal range and enhancing both HER and HOR electrocatalysis. This work offers fundamental insights into covalent‑bond modulation in amorphous oxides and establishes a generalizable design paradigm for high-performance electrocatalysts in sustainable energy conversion. The ionic Ru–F bonds reduce the covalency of RuO 2 and optimize the adsorption behaviour of the Ru sites, enabling F‑RuO 2 to exhibit superior reaction kinetics and catalytic activity in both HER and HOR. Download: Download high-res image (166KB) Download: Download full-size image
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118901
·
IF 6.3
Zipeng Huang,Lili Gan,Lihua Qiao,Yanru Wu,Chenru Hao,Li Cheng,Ziqiang Chi
Microwave dielectric ceramics for next-generation communication systems require a high relative permittivity (
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高影响因子
ACS ES&T Engineering
·
2026
·
IF 6.3
Wenjie Luo,Min Xie,Zihao Wang,Hang Zhang,Kang Liu,Jun Liu,Zhang Lin,Liyuan Chai,Min Liu
Alumina (Al2O3)-based catalysts are widely used for the catalytic hydrolysis of CF4, where coordinatively unsaturated Al (AlIII) sites cooperate with surface hydroxyl groups to facilitate C–F bond activation. However, the catalytic performance of conventional Al2O3 is strongly limited by the low abundance of AlIII sites and the insufficient reactivity of hydroxyl species, making high temperatures necessary for complete CF4 conversion. In this study, we report a single-atom Fe modification strategy (Fe1/Al2O3) that promotes CF4 hydrolysis by simultaneously increasing the fraction of AlIII sites and enhancing the Brønsted acidity of surface hydroxyl groups. 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy showed that the incorporation of isolated Fe atoms increased the proportion of AlIII sites from 2.1% to 9.9%, corresponding to a 4.7-fold enhancement. Pyridine-IR (Py-IR) results further indicated that the Brønsted acidity associated with surface −OH species on Fe1/Al2O3 was 5.4 times higher than that of pristine Al2O3. In addition, temperature-programmed desorption (TPD) and in situ infrared spectroscopy revealed much stronger CF4 adsorption and C–F bond activation ability over Fe1/Al2O3. Consequently, Fe1/Al2O3 delivered complete CF4 decomposition at 580 °C and maintained stable performance for more than 200 h, whereas pure Al2O3 only achieved 56% conversion and remained stable for 30 h. These findings provide a viable strategy for the rational design of highly active catalysts for low-temperature CF4 hydrolysis.
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Wei Bao,Ming-Yang Shi,Pei-Zheng Liu,Hao Du,Zheng-Xuan Ni,Lin-Na Tian,Jia-Jia Zhao,Chao Shi,Li-Zhuang Chen
Molecular ferroelectric materials exhibit structural tunability and high flexibility, demonstrating significant potential in flexible electronics and wearable sensing applications. Herein, we use nonpolar piperidinium tetrafluoroborate PipBF4 (1, Pip+ = piperidine) as the precursor. We designed and synthesized an organic–inorganic hybrid ferroelectric, (4,4-DFPD)BF4 (2, 4,4-DFPD+ = 4,4-difluoropiperidinium), via H/F substitution strategy. Single-crystal structural analysis indicates that the introduction of fluorine atoms successfully induces symmetry breaking in the crystal structure, causing it to crystallize at room temperature in the ferroelectric space group Pca21. At the Curie temperature, the (4,4-DFPD)BF4 transitions from an ordered ferroelectric state to a disordered paraelectric state. This (4,4-DFPD)BF4 exhibits a phase transition temperature (Tc = 398 K), spontaneous polarization, and piezoelectric properties (d33 ≈ 28 pC/N). Based on the piezoelectric properties of (4,4-DFPD)BF4, we fabricated flexible composite films of (4,4-DFPD)BF4/PBAT PBAT = poly(butylene adipate-co-terephthalate). These films achieve mechanical-to-electrical energy conversion without additional polarization treatment, delivering an output voltage up to 4 V at the optimal composition. This flexible sensor can stably monitor various physiological signals ranging from large-scale human joint movements to minute vocal cord vibrations. It exhibits high durability, exceeding 2000 cycles.
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PubMed
高影响因子
Advanced Science
·
2026
·
IF 14.1
Hang Zhang,Jialin Zheng,Xiaojian Wang,Hao Yu,Diya Xie,Wenjie Luo,Minghui Yang,Kang Liu,Yuxia Duan,Zhang Lin,Liyuan Chai,Emiliano Cortés,Min Liu
Geometric singularities are known to concentrate electric and optical fields, but whether curvature alone can localize thermal energy and thereby influence chemical kinetics remains unresolved. Here, we show experimentally and computationally that nanoscale curvature generates localized thermal fields that directly lower reaction barriers in heterogeneous catalysis. Using γ-Al 2 O 3 architectures with systematically varied curvature, nanoneedles, micro-needles, and spheres, while maintaining comparable composition, phase, acidity, and defect states, we observe curvature-dependent temperature localization of up to ∼30 °C at nanoneedle tips under identical external heating. In situ infrared thermography confirms hotspot formation, and operando vibrational spectroscopy reveals enhanced water dissociation and increased *CF 3 intermediate populations during CF 4 decomposition. These effects reduce the apparent activation energy and enable complete CF 4 decomposition at 580 °C, substantially below that required for lower-curvature structures. The results establish curvature-induced thermal localization as a general physical mechanism linking geometry to interfacial energy density and reaction kinetics, providing a universal design principle for activating strongly bound molecules.
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PubMed
高影响因子
Coatings
·
2026
·Vol. 16
·期 6
·711
·
IF 3.4
Hui Liu,Yu Zhu,Xin Cheng,Zhenhua Dong,Qiang Liu
Superhydrophobic materials offer promising prospects for utilization in energy, environmental, and related fields. However, their long-term stability in natural environments is constrained by factors such as mechanical wear and aging, which compromise their practical effectiveness and service life. While notable experimental results have been obtained worldwide, scalable application remains limited by the complexity of the requisite fabrication processes. In this study, a durable superhydrophobic coating was developed through a facile one-step process, utilizing a polyaspartic ester (PAE) matrix reinforced with a composite of self-synthesized fluorinated silica (F-SiO2) and hexagonal boron nitride (h-BN) micro-/nano-structures. This strategy effectively enhanced filler dispersion within the resin matrix and promoted hydrophobicity, yielding a stable superhydrophobic surface. The resulting coating exhibits significant potential for scalable application. The optimized coating demonstrated a water contact angle of 161.2° and a roll-off angle of 7.6°, showing excellent repellency to water, corrosive liquids, and fluids across a wide pH range, along with remarkable self-cleaning performance. Benefiting from the synergistic enhancement of h-BN and F-SiO2, the coating also exhibits superior mechanical durability, maintaining a contact angle of 144.4° after 1000 abrasion cycles. Furthermore, in low-temperature anti-icing tests, the coating significantly delayed ice formation on its surface. Notably, after 1000 h of UV aging tests, the F-SiO2@BN/PAE coating retained its intact superhydrophobic structure, with the water contact angle only slightly decreasing from 159.6° to 152.8°, still within an excellent superhydrophobic state, demonstrating outstanding weather resistance. By integrating surface functionalization with mechanical reliability through a facile one-step fabrication process, this study provides significant insights for the large-scale application of hydrophobic materials in the energy and transportation sectors.
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高影响因子
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