Journal of Energy Chemistry
·
2025
·
IF 14.9
Wei Hua,Xiya Yang,Zhangyi Zheng,Mutian Ma,Kun Feng,Daqi Song,Peng Liu,Fenglei Lyu,Jun Zhong,Zhao Deng,Yang Peng
Electrocatalytic CO 2 reduction (eCO 2 R) in acidic electrolytes is propitious to enhance CO 2 utilization, yet suffering from low current efficiency due to the rapid kinetics of the competing hydrogen evolution reaction (HER), especially under high current densities. This study proposes the implementation of a single-atom NiNC cocatalyst concurrently generating CO and releasing OH − to neutralize H + in the electrolyte, thereby simultaneously suppressing HER and promoting C–C coupling. By homogeneously mixing the NiNC cocatalyst with Cu nanoparticles (NPs), as opposed to a stratified configuration, a high ethylene Faradaic efficiency (FE) of 57% was achieved at 600 mA cm −2 in acidic media, along with a remarkable single-pass CO 2 conversion efficiency of 52.4%. While rotating disk electrode tests and operando Raman spectroscopy attest to the restricted H + diffusion and elevated local pH near the catalyst surface, in situ Infrared and differential electrochemical mass spectrometries corroborate the spillover of CO from the cocatalyst to neighboring Cu NPs for enhanced C–C coupling. This work offers new insights into the design and application principles of compositional eCO 2 R catalysts for promoting multicarbon synthesis in acidic media at high current density.
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产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2017
·
IF 4.849
Qiujie Tang,Zhaogang Bian,Wei Wu,Jin Wang,Ping Xie,Charles U. Pittman,Jr.,Aihua Zhou
The method for constructing C–S bonds is very important in organic synthesis. Here a new sulfenylation method to generate flavone thioether derivatives was developed by employing aromatic or alkyl halides, S powder and Na2S2O3 as reactants. Good yields of regioselective Calkyl–S and Caryl–S-substituted flavones were generated under relatively environmentally friendly and simple conditions. This method might be potentially applicable to large scale production, and it enriches current sulfenylation methods.
研究领域:
有机化学
·
药物合成
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DOI
PubMed
高影响因子
CHEMISTRY OF NATURAL COMPOUNDS
·
2023
·Vol. 59
·期 6
·1067-1074
·
IF 0.8
Chen Yi-Fang,Luo Ji-Feng,Zhang Yan-Ni,Wang Yue-Hu
Four flavonoid C -glycosides, including two new diglycosides, dendrodiglycosides A ( 1 ) and B ( 2 ), along with known isoviolanthin ( 3 ) and apigenin 6- C - β -D-glucopyranosyl-(1→2)-α-L-arabinopyranoside ( 4 ), were isolated from the leaves of Dendrobium officinale (Orchidaceae). Their structures were elucidated by NMR and MS. Apigenin 6- C - β -D-glucopyranosyl-(1→2)-α-L-arabinopyranoside exhibited an inhibitory effect against tyrosinase with an IC 50 value of 146.5 μg/mL.
研究领域:
植物化学
·
药理学
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DOI
高影响因子
Food & Function
·
2021
·Vol. 12
·期 17
·7688-7698
·
IF 5.396
Huifang Ge,Yiqun Jiang,Zhenzhen Ning,Zhiqing Hu,Sitong Ma,Yin Shao,Jingbo Liu,Ting Zhang
Recent studies have indicated that active peptides can induce an improvement in wound repair. Herein, we evaluated egg white peptides (EWPs) as a nutritional supplement to improve mechanical skin damage in BALB/c mice. Two symmetrical circular full-thickness wounds were created with 5 mm biopsy punches in the skin of the mouse dorsal region, and EWPs (200, and 400 mg kg−1) were administrated by gavage for 14 days. We analyzed the EWPs for their in vivo and in vitro antioxidant capability, toxicity, and microscopy of skin wounds, and there was no cytotoxicity or in vivo toxicity. During the period of wound healing, EWPs could promote healthy cell migration, increase serum superoxide dismutase and catalase activities and accelerate the wound healing process in a time- and dose-dependent manner, whereas the levels of malondialdehyde and reactive oxygen species showed the opposite trend. After administration with 400 mg kg−1 EWPs for 10 days, the wound had almost healed. Meanwhile, EWPs significantly enhanced serum amino acids, particularly enhancing the content of Arg, Glu, Pro, Met, and Lys, which could provide sufficient nutrition in the wound healing process. The present study demonstrates that EWPs possess a positive potential to accelerate the wound healing process of mechanical skin damage at the cellular and animal level.
研究领域:
营养学
·
生物医学
·
细胞生物学
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DOI
PubMed
高影响因子
eFood
·
2022
·Vol. 3
·期 3
·e13
·
IF 0
Hui Cao,Petra Högger,Miguel-Angel Prieto,Jesus Simal-Gandara,Jianbo Xiao
Quercetin is evidently unstable in Dulbecco's modified Eagle's medium (DMEM) at 37°C. However, the underlying mechanism of this instability is not clear yet. The stability and new degradation products of quercetin in DMEM at 37°C were investigated via in UPLC-MS-MS analysis. With increasing incubation time, quercetin formed various degradation products derived from its dimer and there were numerous isomers formed during this process. Ascorbic acid significantly improved the stability of quercetin by protecting quercetin from auto-oxidation in this medium. Ascorbic acid also remarkably enhanced the stability of quercetin in DMEM in the presence of A549 cells and obviously increased the antiproliferative effect of quercetin toward A549 cells.
研究领域:
药理学
·
细胞生物学
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DOI
JOURNAL OF ORGANIC CHEMISTRY
·
2022
·
IF 4.198
Shihai Lv,Ya-Nan Tian,Yanyan Yang,Chaoying Wen,Shiqing Li
An efficient one-pot synthesis of 1,1′-biisoquinolines by a three-component reaction of commercially available raw materials (benzils, NH4OAc, and alkynes) is disclosed. This complicated reaction involves in situ diimine formation via benzil-NH4OAc condensation, Rh(III)-catalyzed 2-fold imine-directed C–H activation, and annulation with alkynes. Both symmetric and unsymmetric 1,1′-biisoquinolines could be assembled in moderate to high yields. The reaction mechanism is supported through ESI-MS, in which Cp*ClRh+, Cp*(OAc)Rh+, Cp*(OPiv)Rh+, and two rhodacycle intermediates are successfully detected to explain the evolution of rhodium species.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
ChemSusChem
·
2023
·
IF 8.4
Kangzhe Cao,Sitian Wang,Jiahui Ma,Xiaobing Xing,Xiaogang Liu,Yong Jiang,Yang Fan,Huiqiao Liu
Graphical MnNb 2 O 6 -C nanofibers (NFs) with MnNb 2 O 6 nanoparticles (~15 nm) confined in carbon NFs were prepared and evaluated as Li-ion battery anode. Microstructure reconstruction is verified in this kind of intercalation type anode material and that increases the pseudo-capacitance contributions, which is the main reason for the high-capacity achieved by the MnNb 2 O 6 -C NFs electrode. MnNb 2 O 6 anode has attracted much attention owing to its unique properties for holding Li ions. Unluckily, its application as a Li-ion battery anode is restricted by low capacity because of the inferior electronic conductivity and limited electron transfer. Previous studies suggest that structure and component optimization could improve its reversible capacity. This improvement is always companied by capacity increments, however, the reasons have rarely been identified. Herein, MnNb 2 O 6 -C nanofibers (NFs) with MnNb 2 O 6 nanoparticles (~15 nm) confined in carbon NFs, and the counterpart MnNb 2 O 6 NFs consisting of larger nanoparticles (40–100 nm) are prepared by electrospinning for clarifying this phenomenon. The electrochemical evaluations indicate that the capacity achieved by the MnNb 2 O 6 NF electrode presents an activation process and a degradation in subsequence. Meanwhile, the MnNb 2 O 6 -C NF electrode delivers high reversible capacity and ultra-stable cycling performance. Further analysis based on electrochemical behaviors and microstructure changes reveals that the partial structure rearrangement should be in charge of the capacity increment, mainly including pseudocapacitance increment. This work suggests that diminishing the dimensions of MnNb 2 O 6 nanoparticles and further confining them in a matrix could increase the pseudocapacitance-dominated capacity, providing a novel way to improve the reversible capacity of MnNb 2 O 6 and other intercalation reaction anodes.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
Chem Catalysis
·
2022
·
IF 0
Xianhao Zhang,Huijuan Jing,Shiming Chen,Bing Liu,Liang Yu,Jianping Xiao,Dehui Deng
Summary Cyclohexanone oxime (CHO), a key C=N organic compound in the manufacture of nylon 6, is conventionally synthesized via a multistep process that consumes expensive NH 3 and H 2 under harsh conditions. Herein, we report the direct electro-synthesis of CHO from low-cost NO, H 2 O, and cyclohexanone over a carbon catalyst under ambient conditions. A high Faradaic efficiency of 44.8% and a formation rate of 10.7 mg cm −2 h −1 for CHO were achieved at −0.4 V versus the reversible hydrogen electrode through optimizing the surface hydrophobicity of the catalyst to facilitate diffusion of reactants. Controlled experiments and 15 N-labeling tests verified that the nitrogen in the CHO product originates from NO. Density functional theory calculations showed that the armchair edge of carbon could be the active site with a reaction mechanism following NO → NO∗ → HNO∗ → HNOH∗ → NH 2 OH → CHO. This work suggests a direct, green, and low-cost synthesis strategy for high-value CHO from pollutant NO.
研究领域:
化学工程
·
环境科学
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DOI
Catalysts
·
2022
·Vol. 12
·期 5
·571
·
IF 4.501
Yuxin Liu,Jing Ye,Fanpeng Kong,Chunyu Du,Pengjian Zuo,Lei Du,Geping Yin
Proton exchange membrane (PEM) fuel cells using Pt-based materials as electrocatalysts have achieved a decent performance, represented by the launched Toyota Mirai vehicle. The ideal PEM fuel cells consume stored pure hydrogen and air. However, SO2, as a primary air contaminant, may be fed along with air at the cathode, leading to Pt site deactivation. Therefore, it is important to improve the SO2tolerance of catalysts for the stability of the oxygen reduction reaction (ORR). In this work, we develop the Pt/C-TiO2catalyst against SO2poisoning during ORR. Impressively, the hybrid Pt/C-TiO2catalyst with 20 mass % TiO2shows the best ORR and anti-toxic performance: the kinetic current density of ORR is 20.5% higher and the degradation rate after poisoning is 50% lower than Pt/C. The interaction between Pt and TiO2as well as the abundant hydroxyl groups on the surface of TiO2are both revealed to account for the accelerated removal of poisonous SO2on Pt surfaces.
研究领域:
材料科学
·
电化学
·
能源科学
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DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2021
·Vol. 31
·期 2
·1317-1324
·
IF 1.819
Jin Ling,Jiang Kaiyong,Kang Lei,Yan Binggong
Copper and copper alloys own high thermal conductivity, electrical conductivity, good plasticity, and corrosion resistance, which are widely used in electric power, aerospace, and marine engineering. Due to low absorption rate of infrared and near infrared light, high thermal conductivity and high activity with oxygen, laser cladding of copper, and copper alloys are difficult to be conducted in air since the problems associated to cracks and voids are always hardly to be eliminated. In this paper, C-Al 2 O 3 -Cu composite powder mixed with Ni and Fe was developed to solve these problems. Use of carbon was to depress the oxidation and improve the laser absorption, while alumina was used to improve the laser absorption and mechanical strength. To improve the bonding strength between cladding layer and substrate, Ni and Fe were used. Experimental results showed that no obvious aggregation was observed and the powder showed good fluidity. The tensile strength of the cladding layer is 406.7 ± 0.1MPa which is about 1.7 times higher than that of pure copper substrate, and the tensile fracture of the cladding layer revealed microporous aggregation fracture due to the existence of Al 2 O 3 in the cladding layer.
研究领域:
材料科学
·
激光技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Chunxu Hu,Xueping Zheng,Wenshuai Liu,Linkun Liang
Magnesium holds significant promise as an on-site hydrogen generation material due to its high theoretical hydrogen yield, low cost, and environmental friendliness. However, its practical application is severely hindered by the magnesium hydroxide passivation layer formed during hydrolysis. In this study, a composite catalyst of molybdenum disilicide supported on coconut shell-derived activated carbon (MoSi 2 /C) was synthesized via a two-step calcination method and subsequently compounded with magnesium powder through ball milling. The as-prepared Mg-5wt% MoSi 2 /C composite exhibits remarkable hydrogen production performance via hydrolysis in a 3.5 wt% NaCl solution (simulating seawater). At 25 °C, it achieves a hydrogen yield of 916 mL/g within 90 s and a maximum hydrogen generation rate (mHGR) of 780 mL·g −1 ·min −1 , significantly outperforming pure Mg and a Mg-C composite. The apparent activation energy for the hydrolysis of this composite is notably reduced to 15.62 kJ mol −1 , indicating substantially enhanced reaction kinetics. The enhanced performance originates from the synergistic effect between the conductive carbon matrix and the highly dispersed MoSi 2 nanoparticles: the carbon matrix effectively prevents the agglomeration of Mg particles and facilitates electron transfer, while the MoSi 2 nanoparticles provide abundant active sites for the hydrolysis reaction. This work presents an efficient catalytic strategy for developing high-performance, low-cost magnesium-based materials for hydrogen production via hydrolysis.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Bin Yao,Xudong Bu,Yurong Zhang,Xiaodong Chen,Yanshuang Meng,Kai Zhang,Xiaofeng Zhu,Sheng Wang,Xueyan Du
Ti 3 C 2 T x MXene holds great promise as an electrode material for electrochemical energy storage, but its practical application is often limited by the restacking of nanosheets, which impedes ion accessibility and rate capability. Herein, a simple in-situ carbonization strategy using polyacrylonitrile (PAN) is developed to fabricate MXene/C composite electrodes. During pyrolysis, PAN transforms into N-doped amorphous carbon, which not only spacers and bridges adjacent Ti 3 C 2 T x MXene lamellae but also introduces porosity, thereby enlarging the interlayer spacing and forming a permeable mesoporous network while maintaining efficient electron transport. Electrochemical evaluation identifies 600 °C as the optimal carbonization temperature, leading to surface-capacitive-dominated charge storage with enhanced ion diffusion kinetics. By optimizing the composition, the composite with 20 wt% PAN achieves a specific capacitance of 237.75 F g -1 at 1 A g -1 , along with significantly improved rate performance and cycling stability compared to the pristine MXene electrode. This polymer-derived carbon intercalation approach offers a straightforward and effective route for tailoring the MXene interlayer structure, facilitating the rational design of high-performance supercapacitor electrodes.
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DOI
高影响因子
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