Frontiers in Chemistry
·
2022
·
IF 5.545
Lei Yuxi,Xiao Xuefeng,Ma Tianpeng,Li Weiyin,Zhang Huan,Ma Chao
Layered transition metal dichalcogenides (TMDs), such as molybdenum ditelluride (MoTe2), have attracted much attention because of their novel structure-related physicochemical properties. In particular, semi-metallic-phase MoTe2 (1T′) is considered as a competitive candidate for low-cost electrocatalysts for water splitting. However, there are few reports on the simple hydrothermal synthesis of MoTe2 nanostructures compared with other layered TMDs. In this study, a facile one-step hydrothermal process was developed for the fabrication of layered MoTe2, in which uniform nanotubes with a few layers of 1T′ MoTe2 were fabricated at a lower temperature for the first time. The as-obtained MoTe2 nanotubes were fully characterized using different techniques, which revealed their structure and indicated the presence of layered 1T′ nanocrystals. The efficient activity of MoTe2 nanotubes for the electrocatalytic hydrogen evolution reaction (HER) in 0.5 M H2SO4 was demonstrated by the small Tafel slope of 54 mV/dec−1 and endurable ability, which is attributed to the abundant active sites and remarkable conductivity of 1T′ MoTe2 with a few-layer feature. This provides a facile method for the design and construction of efficient layered MoTe2 based electrocatalysts.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2020
·
IF 7.888
Lei Liu,Han Gao,Shu-Qing Yang,Xiao-Chao Chen,Yong Lu,Ye Liu,Fei Xia
The one-pot tandem hydroformylation-reduction to synthesize alcohols from olefins is in great demand but suffering from low yields, poor selectivity and harsh condition. Herein, 1,10-phenanthroline ( L1 ) modified Ir-catalyst proved to exhibit multiple catalysis in terms of FA dehydrogenation, hydroformylation of olefins, and transfer hydrogenation of aldehydes to accomplish the tandem hydroformylation-transfer hydrogenation of olefins with formic acid (FA) as hydrogen source, as the result of 52–70% yields for the target alcohols and the corresponding formate esters (obtained upon esterification of the alcohol with FA). In this sequence, only the use of FA with trans - and cis -conformers could fulfill the reduction of aldehydes to the alcohols through transfer hydrogenation as well as greatly depress hydrogenation of the olefin, which universally occurred in the high pressured gaseous H 2 . Both the in situ FT-IR spectroscopic analysis and the DFT-calculations verified that, over L1 -[Ir(COD)Cl] 2 catalyst, cis -FA serving as the hydride-ligand was responsible for the efficient dehydrogenation of FA to release H 2 along with CO 2 , and trans- FA serving as the carbonyl O-containing ligand corresponded to the transfer hydrogenation of the aldehydes to the alcohols under the same catalytic conditions.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Lian Yu,Yao Meng,Ze-Lin Wang,Liu Cao,Chang Liu,Ming-Zhu Gao,Chun-Jian Zhao,Yu-Jie Fu
Nowadays, developed an efficient and sustainable method to extract bioactive compounds from plants biomass has gained more and more attention. As surfactant aqueous possesses an obviously advantage of highly extraction efficiency from the raw plants, it is naturally to emerge as an alternative to traditional extractant. In order to obtain the maximum yield in the shortest time, the surfactant-based microwave-assisted extraction was applied to extract five target bioactive compounds from fig ( Ficus carica L.) leaves. Under optimal conditions, the extraction yields of caffeoylmalic acid, psoralic acid-glucoside, rutin , psoralen and bergapten reached 9.72 mg/g, 5.95 mg/g, 4.77 mg/g, 15.65 mg/g and 3.49 mg/g, respectively. These results showed that the final extraction yields were much higher than those by traditional methods. The present study indicated that the surfactant (PEG8000)-based microwave-assisted extraction method was extremely sustainable and efficient for extraction of active ingredient from fig leaves.
研究领域:
植物化学
·
提取技术
·
药用植物研究
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Ying Liu,Yi Liu,Yingying Xu,Qingshen He,Rongyang Yin,Pengfei Sun,Xiaoping Dong
Nitrophenols (NPs) are widely used in industries and highly toxic to ecological environment and human health. Because aminophenols (APs) are important chemicals, catalytic reduction of NPs via efficient and environment-friendly strategies is of great importance. Herein, we developed a green photocatalysis route to efficiently convert NPs to APs using a Fe (II) modified graphitic carbon nitride (g-C 3 N 4 ) photocatalyst, where phenanthroline units were employed to bridge Fe (II) and carbon nitride framework. The optimized sample P-CN-8-Fe presented significantly improved absorption of visible light, separation of photogenerated charges and carrier transportation in comparison with the pristine g-C 3 N 4 and the modified samples of CN-Fe and P-CN-8. Accordingly, the P-CN-8-Fe showed a high conversion (97%) of p -nitrophenol ( p -NP) to p -aminophenol ( p -AP) under 2 h visible light irradiation, and meanwhile possessed high photocatalytic durability. Its high activity was also demonstrated through photocatalytic reduction of other NPs and nitrobenzene compounds. Finally, a possible mechanism was proposed for the photocatalytic reduction of p -NP by P-CN-8-Fe. This work provides an effective approach to prepare Fe (II) modified g-C 3 N 4 through the bridging effect of phenanthroline group, which is a potential visible light driven photocatalyst for reduction of nitrobenzene derivatives.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Fengxiang Sun,Shan Zhu,Zixun Liu,Chang Liu,Kezhu Jiang,Yangyang Zhang,Biao Chen,Shijian Zheng
In evaluating the oxygen evolution reaction (OER) electrocatalysts, a lower Tafel slope signifies a reduced overpotential requirement to achieve a given current density. Metal oxides have attracted considerable attention as promising OER catalysts due to their natural abundance and high catalytic activity. However, the factors influencing the Tafel slope of metal oxides are inherently complex, encompassing both intrinsic material properties and extrinsic experimental conditions. In this study, we pioneer a data-driven approach integrated with experimental synthesis to investigate the key parameters affecting the Tafel slope of metal oxide OER catalysts. Leveraging a comprehensive database sourced from extensive literature and multiple machine learning (ML) algorithms, we have identified the specific surface area (SSA) as a crucial parameter for optimizing the Tafel slope. This represents a data-driven discovery that has remained unexplored in studies on the OER. Guided by these insights, we developed a sacrificial carbon template method to synthesize 3D mesoporous network NiCo 2 O 4 (3D-MN NiCo 2 O 4 ) with structural advantages. This unique architecture achieves high SSA (132.3 m 2 g −1 ), uniform nanoscale particles, and enhanced conductivity through its 3D interconnected network, enabling superior mass/charge transport efficiency. The catalyst demonstrates low Tafel slope (38 mV dec −1 ) across wide current densities, minimal overpotential (0.304 V@10 mA cm −2 ), and good stability (>100 h@10 mA cm −2 ), outperforming RuO 2 and conventional nanoparticles. Remarkably, the synthesis strategy shows generalizability, successfully extending to MnCo 2 O 4 , FeCo 2 O 4 , FeNi 2 O 4 , and high entropy oxides. This work bridges theoretical data analysis with practical catalyst design, establishing a versatile strategy for developing advanced electrocatalysts.
研究领域:
材料科学
·
电化学
·
数据科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Jin Chen,Yiwei Fang,Borui Sun,Ying Xu,Wanyi Chen,Kai zhao,Huiping Zhang
Polycyclic aromatic hydrocarbons (PAHs) are widespread pollutants from incomplete combustion of organic materials, linked to various health issues and pregnancy complications. This study explored the relationship between PAH metabolites and gestational hypertension. Urine samples from 118 normal pregnant women and 40 with gestational hypertension were analyzed. In vitro experiments using human trophoblast cells (HTR-8/SVneo) exposed to these metabolites assessed their effects on cellular metabolism. Comprehensive metabolomics analysis was performed using Tidymass and DRomics to integrate global and dose-response metabolomics data. Results showed higher levels of 1-hydroxypyrene (1-OHPYR) and 9-Hydroxyphenanthrene (9-OHPHE) linked to gestational hypertension, inhibiting trophoblast cell invasion and migration. Identified markers include Isobutyryl-L-carnitine, methyl-3-hydroxybutyric acid, threonine, and glutamic acid for 1-OHPYR, and phosphocreatine for 9-OHPHE. This study highlights the connection between PAH metabolites and gestational hypertension, suggesting potential biomarkers and mechanisms. Future research should confirm these findings and explore prevention and treatment strategies.
研究领域:
环境健康
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生殖医学
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代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Miao Lu,Siyuan Zhang,Liang Ma,Zhongmei Song,Xiushen Ye,Huifang Zhang,Haining Liu,Zhijian Wu
The efficient removal of recalcitrant organics in high-salinity systems, specifically brine, poses a significant challenge for electrochemically advanced oxidation processes in terms of both activity and stability. Herein, a composite electrode comprising of CNT/Nafion functionalized Ti/SnO 2 -Sb/β-PbO 2 -CNT/Nafion was developed for efficient and stable removal of octadecylamine (ODA) and 4-dodecylmorpholine (DMP) in a real high-salinity environment. The degradation efficiencies of ODA and DMP on the composite electrode can reach 100 % within 60 min, respectively. The total organic carbon (TOC) removal efficiency of ODA and DMP was significantly improved to 78 % and 66 % with remarkably low energy consumption (0.414 and 1.402 kWh/g TOC), respectively. The electrochemical characterizations demonstrate that the composite electrode exhibits improved electrochemical activity (oxygen evolution potentials = 1.791 V) and electrode surface area (ECSA = 20 cm 2 ), while maintaining reduced charge transfer resistance ( R ct = 18.21 Ω/cm 2 ) and enhanced corrosion-resistant capacity (corrosion potential = 1.115 V). Based on recycling and accelerated lifespan testing, the composite electrode demonstrates exceptional stability and recyclability. Additionally revealed was the linked stability mechanism. The electrocatalytic degradation of ODA and DMP begins with the removal of amino and morpholine rings, and then the decomposition of the carbon chains. Gas chromatography-mass spectrometry (GC–MS) and theoretical calculations were used to identify intermediate products generated during the degradation of ODA and DMP, and possible degradation pathways were provided in high-salinity systems, respectively. This work offered a fresh perspective on electrocatalytic oxidation for a real high-salinity system that is more efficient and stable.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH INNOVATIONS
·
2025
·
IF 0
Mengyuan Zhao,Tingting Wu,Jiale Han,Nan Hu,Hongyuan Zhao
We developed a facile and easy-to-use preparation technique to fabricate peanut shell-derived porous carbon (PSPC) with highly electroactive area and interconnected porous carbon structure. The introduction of zirconium dioxide (ZrO2) nanoparticles into the microporous structure of PSPC results in the formation of PSPC@ZrO2 composite, which was used as electrode sensitiser in the presence of Nafion membrane to modify the surface of glass carbon electrode (GCE) to successfully prepare the PSPC/ZrO2/Nafion/GCE sensor. PSPC has excellent conductivity and abundant electroactive region, which effectively facilitates electron transfer between the sensing interface and electrolyte. The biocompatible ZrO2 recognise the phosphate group of methyl parathion (MP), which enables the effective enrichment of MP. Meanwhile, the presence of Nafion enhanced the stability of the sensing electrode surface. The PSPC/ZrO2/Nafion/GCE sensor achieves highly sensitive detection of MP in the linear range of 0.05–10 μM (Limit of detection: 15.7 nM). The prepared sensor has favourable practicality for MP detection in real samples.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Xiaoyi Zhang,Shengjie Jiang,Guoliang Lin,Hongyu Guo,Fafu Yang
In this article, two new tetraphenylethylene- rufigallol-tetraphenylethylene triads 7a and 7b were synthesized in yield of 50%. These compounds were characterized by mass spectrometry, NMR spectroscopy, and elemental analysis. Their mesomorphic behaviors were studied by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffractometry. Investigation of their liquid crystalline behaviors indicated that compounds 7a and 7b possessed the hexagonal columnar mesophase. Compound 7b with dodecyl chains exhibited the low phase transition temperatures and wide range of mesophase temperatures in comparison with compound 7a . Compounds 7a and 7b exhibited excellent aggregation-induced emission in H 2 O/THF solution. The fluorescence quantum yields of these compounds in the solid state were 22% and 16%, respectively. Results from this study suggest that symmetrical trimer was a good approach to construct novel fluorescence columnar liquid crystals.
研究领域:
材料化学
·
有机化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Aidi Han,Cehuang Fu,Xiaohui Yan,Junren Chen,Xiaojing Cheng,Changchun Ke,Junbo Hou,Shuiyun Shen,Junliang Zhang
With the wide use of platinum alloy electrocatalysts proton exchange membrane fuel cells, the dissolution of transition metal in the acid environment of catalyst layer becomes a major concern due to the decreased catalytic activity during long-term operation. Although great efforts have been done, few attention is paid to the effect of transition metal ion contamination of Nafion ionomer that wrapped around catalyst particles within catalyst layer which might greatly influence the proton conduction. To elucidate such effect, ultrathin Nafion film on SiO 2 model substrate is prepared via self-assembly method to represent the ionomer in fuel-cell catalyst layers, and the ultrathin film with specific thickness is further equilibrated in Co(NO 3 ) 2 /HNO 3 solutions with different Co 2+ concentration to achieve different doping level. Conductivity measurements demonstrate that the non-precious metal contamination severely worsens proton conduction of Nafion ionomer, but it is always ignored before. In addition, when the occupation of H + in Nafion ionomer is less than 50%, the activation energy shows a sharp increase, indicating a possible change in proton conduction mechanism.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2021
·
IF 5.645
Tian Tan,Jiali Zhou,Xin Gao,Xiaoning Tang,Heng Zhang
The eco-benign water-absorbent gel was obtained by modification of tartaric acid (TA) onto parenchyma cellulose from corn stalk pith (CSP) in N, N-dimethylacetamide (DMAc)/LiCl system. The water affinity of the gel was aided with TA as both grafting agent and cross-linker via esterification. The degree of swelling was strongly influenced by TA amount, reaction temperature and duration, and the absorbency of TA-esterified product reached up to about 417 g H 2 O/g dry gel. The three-dimensional macro-porous structures of the bio-absorbent led to fast penetration and diffusion of water into gel. Studies of absorption behavior in deionized water showed that the initial water uptake followed the non-Fickian mechanism, the Schott second-order equation governed the swelling kinetics, and the later part of swelling was relaxation of polymer chains. FTIR and X-ray diffraction analyses confirmed successful modification of TA molecules onto cellulose chains through the formation of ester bonds and transition of crystalline forms from cellulose Ⅰ to cellulose Ⅱ. Moreover, thermogravimetric outcomes illustrated the thermal resistance of the TA-esterified gel with a loose structure was lower than SCP cellulose. This work designed a green water-absorbent that could be potentially utilized as favorable water retention material in agriculture and horticulture.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2018
·Vol. 8
·期 6
·245
·
IF 3.465
Ya Chu,Lin Gu,Xiuping Ju,Hongmei Du,Jinsheng Zhao,Konggang Qu
A composite catalyst was obtained by covalently linking G4-NH2dendrimers and 1,10-phenanthroline-5-carboxylic acid on the surface of carbon powder, and the composite was named as PMPhen/C. In order to improve the catalytic performance of the composite, copper ions (II) were introduced to PMPhen/C by complex to form the PMPhen-Cu/C catalyst. Scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) were applied to investigate the surface microstructure and elemental compositions of the catalysts. The results from electrochemical analysis show that PMPhen/C reduced oxygen to hydrogen peroxide (H2O2) through a two-electron transfer process. PMPhen-Cu/C could reduce oxygen to water through a four-electron pathway. Except the slightly lower initial reduction potential, PMPhen-Cu/C has a comparable oxygen reduction ability (ORR) to that of the commercially available Pt/C catalyst, which makes it a potential candidate as the cathodic catalyst in some fuel cells running in neutral medium, such as a microbial fuel cell.Keywords:Polyamidoamine (PAMAM) G4-NH2dendrimers;phenanthroline;covalent link;ORR catalyst
研究领域:
材料科学
·
电化学
·
催化领域
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）