Chemistry-An Asian Journal
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2023
·Vol. 18
·期 16
·e202300440
·
IF 4.1
Wen Sun,Ying Fang,Gaoming Sun,Congfu Dai,Yana Liu,Jiguang Zhang,Yunfeng Zhu,Jun Wang
Graphical A rutile Ru 0.75 Mn 0.25 O 2−δ solid solution oxide with a porous structure and high Ru >4+ proportion has been developed as an efficient electrocatalyst for simultaneously boosting oxygen evolution reaction under acidic and alkaline conditions, outperforming the commercial RuO 2 and many previously reported catalysts. Proton exchange membrane water electrolysers and alkaline exchange membrane water electrolysers for hydrogen production suffer from sluggish kinetics and the limited durability of the electrocatalyst toward oxygen evolution reaction (OER). Herein, a rutile Ru 0.75 Mn 0.25 O 2−δ solid solution oxide featured with a hierarchical porous structure has been developed as an efficient OER electrocatalyst in both acidic and alkaline electrolyte. Specifically, compared with commercial RuO 2 , the catalyst displays a superior reaction kinetics with small Tafel slope of 54.6 mV dec −1 in 0.5 M H 2 SO 4 , thus allowing a low overpotential of 237 and 327 mV to achieve the current density of 10 and 100 mA cm −2 , respectively, which is attributed to the enhanced electrochemically active surface area from the porous structure and the increased intrinsic activity owing to the regulated Ru >4+ proportion with Mn incorporation. Additionally, the sacrificial dissolution of Mn relieves the leaching of active Ru species, leading to the extended OER durability. Besides, the Ru 0.75 Mn 0.25 O 2−δ catalyst also shows a highly improved OER performance in alkaline electrolyte, rendering it a versatile catalyst for water splitting.
研究领域:
材料科学
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电化学
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能源材料
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催化
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 2
·704-718
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IF 3.9
Jian Bao,Wei Du,Haitao Wu,Zhenxing Yue
In this study, two novel microwave dielectric ceramics were designed and synthesized using the solid-state reaction method based on the CaO–MoO 3 –La 2 O 3 pseudo-ternary phase diagram. The X-ray diffraction (XRD) patterns and Rietveld refinement results indicate that pure phase microwave dielectric ceramics (CaLa 2 (MoO 4 ) 4 and Ca 3 MoO 6 ) can be produced with CaO, MoO 3 , La 2 O 3 ratios of 1, 1, 4, and 3, 1, 0, respectively. CaLa 2 (MoO 4 ) 4 shows the potential value for application in Low Temperature Co-fired Ceramic technology. In addition, the Phillips–van Vechten–Levine theory, infrared reflectance spectrum, and THz time-domain spectrum are used further to study the structure-property relationship of the two ceramics. Finally, a 5G patch antenna used in Sub-6 GHz communication technology was successfully designed and manufactured. The study of the relationship between chemical bonds and dielectric properties of the two ceramics, along with the development of the patch antenna, establishes a foundation for scientific research and practical applications in related ceramic systems.
研究领域:
材料科学
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陶瓷
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电磁工程
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电信
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhong-Yin Zhao,Xiaoxu Sun,Hongwei Gu,Zheng Niu,Pierre Braunstein,Jian-Ping Lang
Metal–organic framework (MOF) nanosheets with attractive chemical and structural properties have been considered as prominent oxygen evolution reaction (OER) electrocatalysts, while the insufficient exposed active sites and low electrical conductivity of MOFs limit their electrocatalytic activity and further industrial applications. Herein, a unique strategy to remarkably boost electrocatalytic OER activity of one Ni-based MOF is developed by the simultaneous incorporation of Fe3+ ions and BF4– anions within its layer structure. The optimized electrocatalyst NiFe-MOF-BF4–-0.3 NSs shows superior OER activity with a required ultralow overpotential of 237 mV at 10 mA cm–2, a small Tafel slope of 41 mV dec–1, and outstanding stability in an alkaline medium. The experimental and density functional theory (DFT) calculation results verify that the interactions between metal (M) ions and BF4– anions (defined as M···F, M = Ni or Fe) in this catalyst can adjust the adsorption abilities of oxygen intermediates and lower the free energy barrier of the potential-determining step by tailoring its electronic structure, thereby remarkably boosting its OER activity. This protocol provides new insights into surface and structure engineering of 2D MOFs, leading to greatly enhanced electrocatalytic OER performance.
研究领域:
材料科学
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电化学
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催化
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纳米技术
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理论化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 18
·15061-15067
·
IF 3.201
Jing Ma,Bing Yan
We prepared multi-component luminescent hybrid films based on a silicon chip by a covalent functionalization strategy of both metal–organic frameworks (ZIF-90) and lanthanide complexes. Herein the Si chip is firstly covalently modified by aminopropyltriethoxysilane (APTES) via a hydrolysis and condensation reaction, and then ZIF-90 is covalently grafted onto the surface of Si chip through imine condensation with APTES to form the hybrid films (Si-APTES-ZIF-90). Ternary lanthanide complexes with 3-methacryloxypropyltrimethoxysilane (MPTMS) and Phen (1,10-phenanthroline) are introduced to the above film systems through MPTMS as a covalent linker. The final multi-component hybrid films (Phen-Ln-MPTMS-Si-APTES-ZIF-90) display the typical Ln3+ (Ln = Eu, Tb, Sm and Dy) luminescence through the energy transfer from the MPTMS-Si-APTES-ZIF-90 host. Moreover, fine tuning of the luminescence color for these films is discussed by adjusting the excitation wavelength. Phen-Ln-MPTMS-Si-APTES-ZIF-90 (Ln = Eu, Sm, Dy) can exhibit white color emission closely by selective excitation. In addition, the consolidation stability under airflow of the film and the luminescence stability of the film under certain humidity environments are discussed.
研究领域:
材料科学
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化学
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光学
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 16
·e202200827
·
IF 9.14
Qimin Peng,Xiaoling Zhuang,Longgui Wei,Luyan Shi,Tayirjan Taylor Isimjan,Ruobing Hou,Xiulin Yang
Graphical A thorny challenge : A nanothorn-like superhydrophilic Nb−CoSe 2 /CC (CC=carbon cloth) catalyst is fabricated through a facile in-situ hydrothermal selenization and Ar annealing strategies. The catalyst illustrates an excellent oxygen evolution activity (297 mV at 200 mA cm −2 ), outstanding long-term durability, and good overall water splitting performance (1.93 V at 500 mA cm −2 ). Developing cost-effective, highly active, and robust electrocatalysts for oxygen evolution reaction (OER) at high current density is a critical challenge in water electrolysis since the sluggish kinetics of the OER significantly impedes the energy conversion efficiency of overall water splitting. Here, a 1D nanothorn-like Nb−CoSe 2 /CC (CC=carbon cloth) structure was developed as an efficient OER catalyst. The optimized Nb−CoSe 2 /CC catalyst exhibited remarkable OER performance with the low overpotentials of 220 mV at 10 mA cm −2 and 297 mV 200 mA cm −2 and a small Tafel slope (54.1 mV dec −1 ) in 1.0 m KOH electrolyte. More importantly, the Nb−CoSe 2 /CC electrode displayed superior stability after 60 h of continuous operation. In addition, cell voltages of 1.52 and 1.93 V were required to achieve 10 and 500 mA cm −2 for the electrolyzer made of Nb−CoSe 2 /CC (anode) and the Pt/C (cathode). Density functional theory (DFT) calculations combined with experimental results revealed that incorporating niobium into the CoSe 2 could optimize the adsorption free energy of the reaction intermediates and enhance the conductivity to improve the catalytic activity further. Additionally, the super-hydrophilicity of Nb−CoSe 2 /CC resulting from the surface defects increased the surface wettability and facilitated reaction kinetics. These results indicate that Nb−CoSe 2 /CC intrinsically enhances OER performance and possesses potential practical water electrolysis applications.
研究领域:
电化学
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材料科学
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催化
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能量转换
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纳米技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Yongde Ma,Yanru Wang,Wenquan Wu,Jiayin Zhang,Yanning Cao,Kuan Huang,Lilong Jiang
Slurry-phase hydrocracking is one of the most advanced technologies for the conversion of inferior heavy oil to light fuel oil. In this work, MoS2 was combined with SiO2–ZrO2 mixed oxides to offer a new class of bifunctional catalysts for slurry-phase hydrocracking. In the bifunctional catalysts, SiO2–ZrO2 mixed oxides with abundant mesopores and acid sites act as cracking catalysts. They were presynthesized by a sol–gel-hydrothermal method and systematically characterized by X-ray diffraction (XRD), N2 adsorption, Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), NH3-temperature programed desorption (NH3-TPD), and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The effect of Si/Zr molar ratios on the chemical structure, especially the acid properties of SiO2–ZrO2 mixed oxides were examined. Subsequently, a mixture of decalin–phenanthrene was selected as the model system to investigate the performance of bifunctional catalysts. It was found that the conversions of decalin and phenanthrene were significantly improved for MoS2/SiO2–ZrO2 bifunctional catalysts. Further analysis indicated that the Brønsted acid sites of SiO2–ZrO2 mixed oxides played an important role in the improvement of decalin and phenanthrene conversions.
研究领域:
化学工程
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催化
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石油炼制
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·8142-8154
·
IF 4
You-Hui Zhao,Hai-Yan Li,David James Young,Xiangqian Cao,Da-Liang Zhu,Zhi-Gang Ren,Hong-Xi Li
Earth-abundant copper(I) coordination complexes of an imine-phosphine and a diimine have been developed as visible-light photocatalysts. Reaction of [Cu(MeCN)4]BF4 with hetero-bidentate phosphinopyrazole (phpz) ligand R1R2C3HN2PPh3 (R1 = R2 = H (1a); R1 = H, R2 = Me (1b); R1 = H, R2 = Ph (1c); R1 = R2 = Me (1d)) and 2,9-dimethyl-1,10-phenanthroline (dmp) gave four heteroleptic bis-chelate Cu(I) complexes [Cu(dmp)(R1R2C3HN2PPh3)]BF4 (R1 = R2 = H (2a); R1 = H, R2 = Me (2b); R1 = H, R2 = Ph (2c); R1 = R2 = Me (2d)) with distorted tetrahedral geometries. Complexes 2a–2d exhibited broad absorption in the visible spectrum and could facilitate photochemical intermolecular atom-transfer radical addition reactions of CBr4, or CCl3Br, CHI3 to styrenes in yields up to 91% and with a broad substrate scope. The absorption, emission, redox potential and photocatalytic activity were dependent on the substituents on the phpz ligand. Mechanistic studies supported an atom-transfer radical addition (ATRA) mechanism.
研究领域:
无机化学
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光化学
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催化
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2025
·
IF 6.2
Xintong Gao,Kaixuan Liu,Chong Zhang,Xian Cao,Takashi Sakamaki,Xiangfeng Xie,Xianning Li
This study investigated how manganese mineral addition enhanced the extracellular electron transfer (EET) capacity of humic acids (HAs) in soil bioelectrochemical systems. Through electrochemical analysis, EEM-PARAFAC, hetero-2DCoS, and structural equation modeling, two complementary transformation pathways of HA components were identified. The first was a microbial-driven aromatic condensation that converted intermediate Component 2 into aromatic-rich, electron-accepting Component 3. The second was an abiotic Mn4+-mediated oxidative fragmentation that produced low-molecular-weight, electron-donating Component 1. These dual processes increased the redox heterogeneity of the HA matrix and supported bidirectional electron shuttling, facilitating continuous redox cycling for pollutant degradation, which enhanced system performance, resulting in a 23% higher phenanthrene removal efficiency and nearly 2-fold greater power density. The findings established a mechanistic basis for the synergistic microbial and abiotic regulation of humic substances, offering new insights for sustainable soil remediation.
研究领域:
环境科学
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土壤修复
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生物地球化学
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生物电化学
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微生物生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Chemistry and Ecotoxicology
·
2025
·
IF 8.2
Hongmin Lu,Ruoqi Wang,Xin Zhang,Yuze Dong,Hao Liu,Yunfan Zhang,Chengxue Ma,Mingwei Xing
Chronic exposure to fluoride and phenanthrene is recognized as a significant risk factor for neurobehavioral toxicity, and the gut-brain axis has been identified as a key mechanism in the development of anxiety behaviors following prolonged toxic insult. Nevertheless, the connections between gut microbiota disruption, serotonin (5-HT) production, and neurobehavioral toxicity induced by long-term co-exposure to fluoride and phenanthrene remain unclear. In this study, co-exposure model of phenanthrene and fluoride at environmentally relevant concentrations was established in zebrafish. Through comparative database analysis, anxiety behavior tests, 16S rRNA sequencing, metabolomics, qPCR, Western blotting, ELISA, flow cytometry, comet assay, histological analysis, and immunohistochemistry, the neurotoxic effects of fluoride or/and phenanthrene were investigated. In this study, neurobehavioral toxicity was observed in zebrafish following co-exposure to environmentally relevant concentrations of fluoride and phenanthrene, characterized by diminished swimming capacity and heightened anxiety behavior. The toxic mechanism was mediated through disruption of the microbiome–gut–brain axis homeostasis and suppression of the Wnt/β-catenin signalling pathway. Specifically, co-exposure decreased intestinal synthesis of 5-HT and impaired the blood–brain barrier. As the intestine serves as the primary source of 5-HT, its impairment (histopathological alterations, gut microbiota dysbiosis and metabolomics) led to dysregulation of the 5-HT system. Histopathological analysis of brain tissue revealed synaptic loss, nuclear pyknosis, and the presence of apoptotic bodies. Investigations into the molecular mechanisms indicated that fluoride or/and phenanthrene inhibited Wnt signalling, promoted β-catenin degradation, and induced neurological dysfunction, as evidenced by reductions in SYP and MAP2, which subsequently activated pro-apoptotic genes (Bax, Caspase9, and Caspase3) and inflammatory responses (decreased IL-10, elevated NF-κB, IL-6, TNF-α, and cleaved IL-1β). These alterations ultimately contributed to neurobehavioral deficits. Collectively, these findings indicate that fluoride and phenanthrene induce anxiety behavior and neurotoxicity, associated with perturbations in 5-HT metabolism, gut microbiota composition, oxidative stress, apoptosis, and neuroinflammation.
研究领域:
毒理学
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环境科学
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神经科学
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分子生物学
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生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Shuangqiang Li,Enchao Li,Feng zhang,Kaiming Peng,Chen Cai,Lijun Lu,Xiangfeng Huang,Jia Liu
Persulfate-based advanced oxidation processes (PS-AOPs) are extensively employed for the remediation of soils contaminated with polycyclic aromatic hydrocarbons (PAHs). However, PAHs could form stable aggregates via π-π interactions, and how these aggregated structures dictate degradation pathways remains unexplored. This study reveals that phenanthrene (PHE) aggregates exhibit accelerated degradation kinetics, with a 3.78 - 25.79 % higher degradation rate than molecules within 3 hours. Structural characterization confirmed the formation of stable submicron aggregates (180.09 nm ± 23.8 nm to 532.03 nm ± 20.5 nm) with ordered lamellar stacking. Density functional theory (DFT) calculations disclosed that the compact architecture of aggregates enhances electrophilic reactivity by facilitating electron delocalization, which reduces the orbital energy gap by 14.34 %. Mechanistic investigations via reactive oxygen species (ROS) probing and electrochemical assays demonstrated that thermal activation preferentially promotes 1 O 2 accumulation (by 54.19 %) and direct electron transfer (by 8.82 %) in aggregates. The non-radical pathways synergistically facilitate the transformation of PHE into characteristic oxygenated products with potential ecotoxicity concerns. The findings elucidate a mechanistic nexus between aggregation-induced electronic effects and preferential non-radical oxidation, providing a fundamental basis for designing targeted remediation strategies for PAH pollutants.
研究领域:
环境化学
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高级氧化技术
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土壤修复
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污染物降解
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理论化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Haijun Huang,Yili Li,An Liu,Ranxin Gui,Qin Shu,Bao Yu,Chuan Jing,Weiguo Cao
Polycyclic aromatic hydrocarbons (PAHs) are high-risk, persistent organic pollutants that exhibit carcinogenic, teratogenic, and mutagenic effects. These compounds readily form and accumulate during cultivation, processing, and storage of herbal medicines. Therefore, it is significant for enhancing the quality control of herbal medicine by developing effective determination methods. In this study, a composite material was synthesized based on layered double hydroxide-derived carbon (LDC) and silver nanoparticle-doped reduced graphene oxide (rGO@AgNPs). The composite has been successfully applied in the simultaneous electrochemical sensing of benzo[a]pyrene (BaP) and phenanthrene (PHE). The morphological and structural properties of the material were characterized by using field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR) techniques. The LDC-rGO@AgNP-based sensor demonstrated exceptional performance in 0.1 M Mg(ClO4)2/acetonitrile aqueous solution, exhibiting wide linear ranges (2–256 μM for both analytes), low detection limits (0.72 μM for BaP and 0.82 μM for PHE), significant anti-interference capability against common interferents, along with good reproducibility and stability. The practical applicability of this sensor was demonstrated through the standard addition method in Coptis chinensis samples, thereby establishing an electrochemical sensing platform for robust monitoring of PAH contaminants in herbal medicines.
研究领域:
环境分析化学
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电分析化学
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纳米材料
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药物分析
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食品与环境安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MARINE POLLUTION BULLETIN
·
2025
·
IF 4.9
Ruicong Gao,Jiaqi Lu,Zhixuan Wei,Hao Xu,Siyuan Jing,Minghuo Wu
PAHs, a group of persistent organic pollutants with significant carcinogenic and mutagenic effects, are widely distributed in the environment and can accumulate in sediments, posing potential threats to mangrove ecosystems and human health. This study is one of the most recent studies that presents an analysis of the vertical contamination characteristics of PAHs in mangrove sediments down to a depth of 80 cm, utilizing a combination of solid-phase extraction and gas chromatography–mass spectrometry. The results showed that the mean value of PAHs was 258.82 ng/g (range from 226.41 to 320.07 ng/g) in the studied mangrove areas (Beihai City, Guangxi). The results indicated a decline in PAH concentrations with increasing sediment depth, with values of 259.3 ng/g in surface sediments (0–10 cm), 240.9 ng/g in intermediate sediments (30–40 cm), and 241.1 ng/g in deeper sediments (60–70 cm). This suggests that PAHs not only remain in the surface layer of the sediment, as in previous studies, but also migrate vertically within the sediment. Based on the results, the potential ecological risks of PAHs were also evaluated by the ERL/ERM model. After environmental risk assessment, it was found that among the six PAHs studied, the contents of all except acenaphthene were lower than the ERL, indicating a low ecological risk. This study elucidates the vertical distribution of PAHs in mangrove sediments, offering crucial data for ecological risk assessment and establishing a foundation for future research on PAH transport mechanisms and their ecological impacts, thereby informing environmental management strategies.
✓ 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）