Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Yang Yang,Zhu Xiaojuan,Wang Lili,Lang Junyu,Yao Guohua,Qin Tian,Ren Zhouhong,Chen Liwei,Liu Xi,Li Wei,Wan Ying
Pd catalysts are widely used in alkynol semi-hydrogenation. However, due to the existence of scaling relationships of adsorption energies between the key adsorbed species, the increase in conversion is frequently accompanied by side reactions, thereby reducing the selectivity to alkenols. We report that the simultaneous increase in alkenol selectivity and alkynol conversion is achieved by manipulating interstitial atoms including B, P, C, S and N in Pd catalysts. A negative linear relationship is observed between the activation entropies of 2-methyl-3-butyn-2-ol and 2-methyl-3-buten-2-ol which is highly related to the filling of d -orbital of Pd catalysts by the modification of p -block elements. A catalyst co-modified by B and C atoms has the maximum d charge of Pd that achieves a 17-fold increase in the turn-over frequency values compared to the Lindlar catalysts in the semi-hydrogenation of 2-methyl-3-butyn-2-ol. When the conversion is close to 100%, the selectivity can be as high as 95%.
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DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Huang De-Xuan,Zhao Jian-Wei,Hu Xue-Lei,Liu Tong
Transition metal oxides have garnered significant attention as electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). However, their sluggish reaction kinetics and poor stability hinder commercial applications. Herein, we report the synthesis of a bimetallic cobalt manganese oxide, Co 0.99 Mn 2.01 O 4 (CMO), synthesized via a hydrothermal technique, which serves as a highly efficient bifunctional ORR/OER electrocatalyst owing to its impressive half-wave potential of 0.767 V and low overpotential of 1.677 V at 10 mA cm −2 . Theoretical calculations revealed that the d-band centers of Co 3d and Mn 3d in CMO, located at tetrahedral and octahedral sites, are positioned near the Fermi level, facilitating the adsorption of electrocatalytic intermediates. Furthermore, the distance between the Co 3d and O 2p band centers in CMO is smaller than that in Co 3 O 4 , and the distance between the Mn 3d and O 2p band centers in CMO is shorter than that in Mn 2 O 3 , indicating that the Co–O and Mn–O bonds in CMO exhibit greater covalency, significantly enhancing ORR/OER activity. Notably, CMO serves as an advanced air electrode material for rechargeable zinc-air batteries (ZABs), demonstrating improved charge–discharge performance with a low voltage gap of 0.87 V at 5 mA cm −2 , high peak power density of 124 mW cm −2 , and excellent cycle stability of over 540 h at 5 mA cm −2 . This superior ORR/OER activity, combined with the simple material combination, makes CMO a promising catalyst for rechargeable ZABs. Graphical
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Jialin Zhao,Xiaojun Hu,Xing Huang,Xin Jin,Kwangnak Koh,Hongxia Chen
The assembly of nanoparticle into electrodes with precise structure and uniform core sizes is important for electrocatalysis. In this study, we reported on a simple strategy for in-situ preparation of gold nanoparticles embedded D-sorbitol hydrogel ( [email protected] ). D-sorbitol hydrogel with acyl hydrazide (D-gel) was synthesized and characterized. AuNP’s stable electronic structure, high surface coverage and good conductivity was achieved enabled [email protected] exhibits the enhanced electrocatalytic performance. The electrochemical results reveal that the catalytic progress is highly promoted by the [email protected] with a detection limit of 0.067 mM and detection range of 0.1–30 mM. The high enzymatic activity and stability provide the high possibility for the development of high value glucose sensors. This mechanistically novel strategy expands the scope of assembly of NPs method for the development of enhanced other electrochemical properties such as amperometric sensing and photcatalysis applications, as well as electrocatalysis.
研究领域:
生物传感
·
材料科学
·
电化学
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Chengjian Li,Lijie Ye,Jingwei Sun,Cheng Zhang,Qingbao Song,Kai Wang,Mi Ouyang
A close-bonded D-A-D′ luminophore BOTPA was designed via direct coupling of secondary arylamine derivatives (D, D′) with benzothiadiazole cyanostilbene group (A). Both near-infrared (NIR) aggregation-induced emission (AIE) and hybridized local and charge-transfer (HLCT) effects, which endow it with highly efficient NIR piezochromic performance, are observed owing to its especially short D-A distance and twisted conformation. The luminophore shows bright fluorescence at 740 nm with an absolute photoluminescence quantum yield (PLQY) as large as 13.2%. Remarkable piezochromism with high sensitivity (11.0 nm•Gpa −1 ) completely in the NIR region (700–840 nm) could be observed from BOTPA crystals, which is rarely found in piezochromic materials (PCMs). The effects of the shortened D-A distance towards the highly efficient NIR piezochromism are confirmed via single-crystal analysis, in-situ FTIR and theoretical calculations. This work provides a new strategy for the development of high-efficiency NIR PCMs which possess strong penetrating capacity.
研究领域:
材料科学
·
光学
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2018
·
IF 3.849
Shujie Ma,Leilei Fu,Siqi He,Xiaopeng Lu,Yuanyong Wu,Zhiqing Ma,Xing Zhang
The evaluation of herbicidal activity and the isolation of plant allelopathic substances can lead to the discovery of new herbicide. This study has confirmed that the ethanol extract of S. mukorossi leaves was inhibitory to growth of Avena fatua L. and Amaranthus retroflexus L. both in petri dish experiment and pot culture assay, with the fresh weight inhibition varied between 47.60% and 62.05% at a concentration of 40 g/L of the leaf extract, being comparable to that of a commercialized natural product herbicide pelargonic acid at a concentration of 4 g/L. Five herbicidal compounds, oleanolic acid (1) , lupeol (2) , d-pinitol (3) , hexadecanoic acid (4) and octadecanoic acid (5) were isolated from the most active fraction, petroleum ether extract. D-pinitol (3) showed the highest growth inhibitory activity against both the shoot and root of A. fatua , with the half maximal inhibitory concentration (IC 50 ) values of 53.61 and 56.43 μg/mL, respectively. Furthermore, oleanolic acid (1) and d-pinitol (3) also inhibited the growth of A. retroflexus with the IC 50 value of 56.05 and 61.89 μg/mL against shoot growth, and 58.07 and 66.70 μg/mL against root growth, respectively. Thus, oleanolic acid (1) and d-pinitol (3) are the main phytotoxin constituents of S. mukorossi , and these compounds have the potential for further development as a botanical herbicide.
研究领域:
植物生理学
·
化感作用
·
天然产物化学
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杂草科学
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农药学
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DOI
高影响因子
Current Analytical Chemistry
·
2024
·Vol. 21
·期 7
·884-897
·
IF 1.7
Tian-Hao Pei,Yu-Long Niu,Bin Liu,Ming Yuan,Ai-Guo Zhang,Xiao-Feng Li,Lian-Xia Wang,Meng-Lei Xu,Yu Gao
BackgroundEssential oils (EOs) are recognized for their potent insecticidal activity and are widely considered promising agents for pest control.MethodsThe insecticidal activity of seven commercial citrus EOs against the global phytophagous pest Thrips flavus was evaluated using bioassays conducted under laboratory conditions. Moreover, the chemical composition of these EOs was analyzed using gas chromatography-mass spectrometry (GC-MS).ResultsAmong the 45 identified compounds, the major constituents were d-limonene (23.77%–95.10%), methyl jasmonate (38.76%), and linalyl acetate (34.55%). Orange flower oil, sweet orange oil, tangerine peel oil, bergamot oil, lime oil, lemon oil, and grapefruit oil exhibited good insecticidal activity against T. flavus without demonstrating significant repellent activity. Orange flower oil and sweet orange oil showed higher insecticidal toxicity, with LC50 values of 0.20 g/L and 0.37 g/L, respectively. In pot experiments, the higher control efficacy against T. flavus was found after 7 days of treatment for orange flower oil (91.14±1.27% at 720.00 g a.i.·hm−2 and 100% at 900.00 g a.i.·hm−2), sweet orange oil (91.14±5.52% at 900.00 g a.i.·hm−2), tangerine peel oil (96.20±2.19% at 720 g a.i.·hm−2 and 100% at 900.00 g a.i.·hm−2), lemon oil (96.20±2.19% at 900 g a.i.·hm−2), and lime oil (97.47±2.53% at 900.00 g a.i.·hm−2).ConclusionTaken together, orange flower oil and tangerine peel oil, which were found to contain d-limonene and methyl jasmonate, demonstrated rapid and more effective insecticidal activity compared to the other EOs tested, which makes these two EOs promising alternatives to chemical insecticides.
研究领域:
农业昆虫学
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植物保护学
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天然产物化学
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农药学
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化学生态学
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DOI
高影响因子
Materials Chemistry Frontiers
·
2019
·Vol. 3
·期 4
·702-708
·
IF 0
Haohao Feng,Xin Song,Ming Zhang,Jiangsheng Yu,Zhuohan Zhang,Renyong Geng,Linqiang Yang,Feng Liu,Derya Baran,Weihua Tang
Two novel dithieno[3,2-b:2,3-d]pyrrol fused electron acceptors (FREAs) with branched alkyl side-chains have been developed. With 2-ethylhexyl and 2-butyloctyl introduced on the N-position of the pyrrol unit, the sidechain engineered acceptors (INPIC-EH and INPIC-BO) were evaluated for organic solar cells (OSCs) by comparison with our reference INPIC-4F bearing a linear octyl chain. The optoelectronic properties of the FREAs and their bulk-heterojunction (BHJ) with a PBDB-T donor for OSCs are systematically studied. All FREAs exhibit similar absorption spectra and energy levels. Notably, the charge dissociation process, charge mobility, and morphology of the BHJ films make a distinct difference. Consequently, the OSCs constructed with INPIC-EH and INPIC-BO delivered a power conversion efficiency (PCE) of 11.9% and 11.2%, lower than that of INPIC-4F devices (13.1%). The lower short-circuit current density (JSC) and fill factor (FF) of INPIC-EH and INPIC-OB based devices are attributed to unfavorable morphology of the active layers and more bimolecular recombination and unbalanced charge transport. Our investigation demonstrates that side-chain engineering on FREAs has a great impact on the morphology of blends and thus the photovoltaic properties of their OSCs.
研究领域:
材料科学
·
光电化学
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DOI
Nanomaterials
·
2021
·Vol. 11
·期 6
·1595
·
IF 5.076
Jing Qi,Tianli Wu,Mengyao Xu,Dan Zhou,Zhubing Xiao
To address the challenge of highly efficient water splitting into H2, successful fabrication of novel porous three-dimensional Ni-doped CoP3nanowall arrays on carbon cloth was realized, resulting in an effective self-supported electrode for the electrocatalytic hydrogen-evolution reaction. The synthesized samples exhibit rough, curly, and porous structures, which are beneficial for gaseous transfer and diffusion during the electrocatalytic process. As expected, the obtained Ni-doped CoP3nanowall arrays with a doping concentration of 7% exhibit the promoted electrocatalytic activity. The achieved overpotentials of 176 mV for the hydrogen-evolution reaction afford a current density of 100 mA cm−2, which indicates that electrocatalytic performance can be dramatically enhanced via Ni doping. The Ni-doped CoP3electrocatalysts with increasing catalytic activity should have significant potential in the field of water splitting into H2. This study also opens an avenue for further enhancement of electrocatalytic performance through tuning of electronic structure andd-band center by doping.Keywords:transition-metal phosphide;electrocatalyst;hydrogen-evolution reaction;density-functional theory
研究领域:
材料科学
·
电化学
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PubMed
高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2022
·Vol. 194
·期 11
·5274-5291
·
IF 3.094
Lei Jiping,Tang Kexin,Zhang Ting,Li Yan,Gao Zhen,Jia Honghua
2-O-α-D-Glucosyl glycerol (2-αGG) can be used as a multipurpose anti-aging, cell-stimulating, and skin moisturizing agent in the cosmetic industry. Sucrose phosphorylase (SPase) has been widely used in the production of 2-αGG. In this paper, the gene encoding sucrose phosphorylase from Bifidobacterium longum (BlSP) was inserted into pRSF-Duet-1 to construct the recombinant plasmid pRSF-BlSP and was functionally expressed in E. coli BL21(DE3) to be used as a biocatalyst for the synthesis of 2-αGG firstly. The mutations of BlSP were carried out based on alanine scanning, and a positive mutant G293A with a 50% increase in activity for 2-αGG production was identified. Mutant G293A has less K m and bigger k cat / K m towards glycerol than the parental BlSP. Subsequently, the production of 177.6 g/L 2-αGG was attained from 1 M sucrose and 1.2 M glycerol catalyzed by 17 mg/mL G293A mutant. This study indicated that BlSP has good potential in the production of 2-αGG.
研究领域:
生物技术
·
酶学
·
药学
·
化妆品
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DOI
PubMed
高影响因子
Oxidative Medicine and Cellular Longevity
·
2018
·
IF 4.936
Kaiyue Sun,Pengyu Yang,Rong Zhao,Yuting Bai,Zijiao Guo
The present study was designed to evaluate the effects of matrine (MAT) on D-galactose- (D-gal-) induced aging and relative mechanism. Vitamin E at the dose of 100 mg/kg was used as a standard positive control. MAT significantly improved the D-gal-induced recognition and spatial memory impairment in novel object recognition and Y maze tests, and exercise endurance decreased in the weight-loaded swimming test at 2 and 10 mg/kg. We found that D-gal treatment induced noticeably aging-related changes such as reducing thymus coefficients, increasing the pathological injury and cellular senescence of liver, spleen, and hippocampus, as well as an increase in cyclin-dependent kinase inhibitor p16, p19, and p21 gene expression and the interleukin-1β expression in the liver and hippocampus. MAT showed effective protection on such changes. Furthermore, MAT decreased the oxidative stress of the liver, plasma, and brain, as evidenced by increased total antioxidant capacity, total superoxide dismutase, and catalase activities and decreased the malondialdehyde level. Additionally, there was a significant positive correlation between swimming time in weight-loaded swimming time and thymus index. MAT ameliorated aging-related disorder caused by D-gal through the inhibition of both cellular senescence and oxidative stress. The study provides further evidence for drug development of MAT for prevention or treatment of the aging-associated disorder.
研究领域:
药理学
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衰老研究
·
神经科学
·
生物化学
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DOI
PubMed
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2025
·
IF 3.1
Dazhi Su,Bowen Tang,Shuoyan Ren,Hengxin Zhong,Zhiqian Liu,Ju Tang,Fuping Zeng
With the development of wide bandgap power semiconductor devices represented by silicon carbide (SiC) to higher voltage levels and faster switching speeds, the reliability of packaging insulation is facing severe challenges. In this paper, the strategy of modifying silicone gel by nano boron nitride (BN) doping is proposed, and the breakdown characteristics of composite insulation materials under high du/dt voltage are studied. The experimental results show that the breakdown voltage of composite insulating materials with different BN doping mass fractions decreases significantly with the increase of voltage rise rate. The doping of BN can effectively improve the high du/dt breakdown voltage of the composite insulating medium, and the modification effect is the most significant when the doping mass fraction of BN is 2%. Further combined with molecular simulation studies, it is found that the change in energy level structure of composite insulating materials under the action of electric field will lead to an increase in the number of carriers, which will accelerate the initiation of avalanche breakdown under high du/dt conditions. The doping of BN changes the charge transport mechanism of the composite material, and enhances the polarization of the molecular chain, thus exhibiting better insulation performance under high du/dt conditions. This study provides important data support and theoretical basis for the development of new high-performance insulation materials for new generation power device packaging.
研究领域:
电力电子
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材料科学
·
电气绝缘
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纳米复合材料
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高电压工程
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
Lu Sun,Jie Wei,Qing Hu,Xiuquan Xu,Jing Wu,Yaoyao Cao,Yao Zhang,Haoyan Wu
A Fe/V-CN nanozyme with synergistically enhanced POD-like activity was rationally designed. • A sensitive cascade colorimetric platform for detecting gastric cancer-related D-amino acids was successfully constructed. • The assay supports reliable quantification of D-amino acids in complex human saliva matrices. The development of a practical and reliable cascade colorimetric method for detecting D-amino acids (DAAs) provides a promising tool for the prevention and preliminary diagnosis of gastric cancer. Herein, a bimetallic Fe V supported on graphitic carbon nitride (Fe/V-CN) nanozyme was rationally designed and synthesized via a simple annealing strategy. The atomic dispersion of Fe and V species, along with their coexisting multivalent states (Fe 2+ / 3+ , V 4+ / 5+ ) synergistically boosted the intrinsic peroxidase-like (POD) activity to Fe/V-CN, which were characterized by a high substrate affinity ( K m of 0.078 and 0.083 mM for TMB and H 2 O 2 ) and an accelerated catalytic turnover ( V max of 4.94 × 10 −7 and 7.76 × 10 −7 M·s −1 , respectively). Leveraging this improved activity, a cascade colorimetric sensing system was developed by integrating Fe/V-CN with D-amino acid oxidase (DAAO) for the specific detection of DAAs. The platform exhibited favorable analytical performance for D-proline (D-Pro) and D-alanine (D-Ala), offering wide linear ranges of 0–200 μM and 0–160 μM and low detection limits of 0.93 μM and 1.45 μM, respectively, combined with acceptable selectivity against common interferents. For real-sample analysis, the platform was successfully implemented in determine DAAs in human saliva, delivering satisfactory recoveries (95.8–105.7%) and good precision (RSD < 3.5%). This work presented a synergistic Fe/V bimetallic nanozyme and a practical sensing strategy, demonstrating the feasibility of DAAs detection in complex biological matrices. Download: Download high-res image (70KB) Download: Download full-size image
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）