NANOTECHNOLOGY
·
2023
·Vol. 34
·期 25
·255402
·
IF 3.5
Chenhui Xu,Furong Xiong,Yao Wang,Jianwei Nai,Wang Zhang
The integration of ultrathin two-dimensional (2D) semiconductors with other conductive 2D materials to form hybrid electrocatalysts with abundant heterointerfaces can enhance the electrocatalytic activity by facilitating interfacial charge transfer. However, the hybrid electrocatalysts with weak interfacial bonding have limited effect on the electrocatalytic performance because the intrinsic activity of interfacial sites cannot be altered by weak interfacial interactions. As a proof-of-concept, we design ultrathin 2D–2D heterostructures with bridge-bonded Ni–O–Ti ligands based on single-layered Ti3C2Tx MXene and metal hydroxides, and further reveal the structure-activity correlation between interfacial bonding and electrocatalytic oxygen evolution reaction by combining theoretical and experimental studies. Density functional theory calculations reveal the modulation of the electronic structure of interfacial metal sites after the formation of bridged interfacial Ni–O–Ti bonding. Compared with the hydrogen-bond-linked heterostructure, the ultrathin 2D–2D heterostructure with bridge-bonded Ni–O–Ti ligands shows enhanced intrinsic activity and stability towards electrocatalytic oxygen evolution with a very low overpotential of 205 mV at 10 mA cm−2 and the long-term durability. This work provides a new understanding and approach for the design and development of 2D hybrid catalysts with highly efficient electrocatalytic activity.
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高影响因子
Science China-Materials
·
2021
·Vol. 64
·期 7
·1598-1608
·
IF 8.273
Hu Jiahui,Tang Wu,Liu Sihong,Hu Yang,Yan Yichao,Lai Huanhuan,Xu Liang,Fan Cong
A new organic cathode namely potassium 2,6-dihydroxyanthraquinone (AQ26OK, theoretical capacity ( C T ) = 169 mA h g −1 ) is synthesized and fully characterized for K-ion batteries. AQ26OK is called polyanionic organic cathode because it has a polyanionic organic skeleton (−2 valent) and two strong ionic K-O bonds. Consequently, the polyanionic AQ26OK is hardly soluble into most organic liquid electrolytes. In half cells (0.3–3.4 V vs. K + /K) using 1 mol L −1 KPF 6 in dimethoxyethane, AQ26OK delivers a highly stable specific capacity of 201 mA h g −1 @50 mA g −1 over 450 cycles (4-month test) and realizes ~106 mA h g −1 for 3200 cycles at 500 mA g −1 . Using the reduced state (K 4 TP) of potassium terephthalate (K 2 TP) as the organic anode, the resulting K 4 TP II AQ26OK organic potassium ion batteries can display a highly stable average discharge capacity of 135 mA h g −1 cathode over 250 cycles at 100 mA g −1 and ~47 mA h g −1 for 1000 cycles at 500 mA g −1 during the working voltage of 0.01–3.1 V. To the best of our knowledge, AQ26OK is among the best stable cathodes reported for K ion batteries.
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高影响因子
COMBUSTION AND FLAME
·
2020
·
IF 4.57
Qiang Lu,Wen-luan Xie,Bin Hu,Ji Liu,Wei Zhao,Bing Zhang,Ti-peng Wang
Pyrolysis of lignin involves complex unimolecular decomposition and bimolecular interaction mechanisms. Unimolecular decomposition of lignin model compounds has been widely investigated, while bimolecular interactions are far from well elucidated. Currently, only two radical reaction-based interactions, i.e., hydrogen abstraction and hydrogen-bond-induced homolysis mechanisms, have been proposed to explain the interactions in the lignin pyrolysis process, which ignores the concerted reaction-based interactions involving the pyrolytic products of lignin. Particularly, a large number of phenolics are produced in the pyrolysis of lignin, which can further affect the concerted pyrolysis reactions of lignin. In the present work, a novel interaction mechanism, phenolics-assisted hydrogen transfer (phenolics-AHT) process for the concerted reactions, is confirmed and carefully investigated. Phenylethyl phenyl ether (PPE), a typical β -O-4 lignin dimer, is used as the model compound to reveal the phenolics-AHT mechanism in the lignin pyrolysis system. Density functional theory (DFT) calculation, electrostatic potential (ESP) analysis, and fast pyrolysis experiment results are combined to reveal that the phenolic products participate in the hydrogen transfer process of the concerted Maccoll elimination reaction by means of their phenolic hydroxyl structures and significantly reduce the energy barrier, thus promoting the cleavage of the β -O-4 linkage. On the contrary, phenolics-AHT has no obvious effect on the concerted retro-ene fragmentation. At medium pyrolysis temperatures, the hydrogen transfer processes induced by phenolic products play a more significant role in the dissociation of the β -O-4 linkage than the hydrogen abstraction induced by radicals, due to the limited amount of free radicals . In addition, DFT calculation results further suggest that decarbonylation , decarboxylation , dehydration, tautomerism , and other concerted reactions can also be promoted by phenolics-AHT.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Chenfei Xiang,Xiuping Wu,Yanjie Zhang,Zihan Zhao,Desheng Li,Hao Song,Bing Li
White light with excellent color rendering property has been highly required for comfortable and healthy illumination. A facile strategy to achieve high color rendering index (Ra >90) in practical applications is using near ultraviolet chips as excitation sources combined with RGB phosphors. However, achieving high color rendering with both blue chips and near-ultraviolet (NUV) chips for commercial phosphors dispersed in phosphor-in-glass (PiGs) materials is still a big challenge. In this work, the PiG based on the ultra-low melting point Sn–F–P–O glass with commercial green (Lu 3 Al 5 O 12 :Ce 3+ ) and red (Sr x Ca 1-x AlSiN 3 :Eu 2+ ) phosphors has been successfully fabricated by one-step sintering method. The phase identification and distribution of monochromatic red phosphor in glass (R-PiG) and green phosphor in glass (G-PiG) were investigated in detail. The Sn 2+ ions in Sn–F–P–O matrix show the intense blue emission bands centered at 420 nm under the excitation of NUV chips (365 nm). Notably, the polychromatic red/green phosphor in glasses (R/G-PiGs) are versatile and exhibited excellent color rendering (Ra = 93, Ra = 95, Ra = 92, respectively) properties excited by both blue chips, NUV chips and laser diodes (WLD). The working temperature of R/G-PiGs is stable at ∼33 °C and ∼55 °C when employed in WLEDs/WLDs (1 W), which greatly prevented the phenomenon of “thermal quenching” for the phosphors caused by high temperature. Thus, the versatile R/G-PiG with ultra-high color rendering and excellent thermal properties indicates its promising application in high-power white LEDs/LDs.
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高影响因子
Journal of the Korean Ceramic Society
·
2025
·
IF 3.8
Zhang Feng-Jun,Zhang Jun-Jie,Zhu Meng-Yuan,Wang Ying-Rui,Li Dong-Cai,Oh Won-Chun
Cu 2 MoS 4 became a novel active alternative material to noble metal co-catalysts, which can effectively promote photocatalytic hydrogen evolution. To investigate the effect of Cu 2 MoS 4 on the photocatalytic performance of Zn-VIA compounds, ZnO, ZnS, ZnSe, and ZnTe were composited with Cu 2 MoS 4 to construct the photocatalysts, and we analyzed the four catalysts for the crystal structure, microscopic morphology, photoelectronic properties, and hydrogen evolution performance. Comparing the four different photocatalysts, the composite of ZnSe and Cu 2 MoS 4 has the highest photocatalytic hydrogen evolution efficiency, and the hydrogen evolution rate of the optimal ratio of ZSeC-20 reaches about 2617 μmol/g/h, which is about 46 times higher than that of pure ZnSe. It is attributed to the loading of Cu 2 MoS 4 to build a heterogeneous structure, which reduces the photogenerated electron and hole recombination rate, which enhances the photocatalytic water splitting hydrogen evolution rate.
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Fan Fan,Hao Xiu,Huiting Ma,Yuting Wang,Yongpeng Cui,Wenqing Yao,Yajun Wang
Efficient separation and rapid migration of photogenerated charges are crucial for achieving high photocatalytic H₂O₂ production. In this study, a K, P, and O co-doped carbon nitride (KPOCN- x ) was synthesized through simple one-pot polymerization for efficient photocatalytic H₂O₂ production. The synergistic doping of metal and non-metal elements enhances light absorption and simultaneously promotes both in-plane and interplane photogenerated charge transfer. Induced by multi-heteroatom doping, especially the form of K bridging, the built-in electric field of KPOCN-5 increases up to 2.27 times that of undoped polymeric carbon nitride (Bulk CN), facilitating the efficient separation of photogenerated charges. Meanwhile, the rod-shaped structure shortens the migration distances of photogenerated charges, further promoting electron transfer and minimizing recombination. As a result, the H₂O₂ production rate of KPOCN-5 reached 3306.6 μmol g −1 h −1 under visible light, approximately 50 times higher than that of Bulk CN. This work highlights the construction of a giant built-in electric field as a powerful strategy for boosting the photocatalytic production of H₂O₂.
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高影响因子
CHEMISTRY & BIODIVERSITY
·
2021
·Vol. 18
·期 11
·e2100301
·
IF 2.408
Zhuojin Yang,Yi Zheng,Nafisa Tursumamat,Mingyan Zhu
Isorhamnetin is a natural flavonoid which shows a variety of biological activities such as antioxidant, anti-inflammatory and antitumor. In order to identify the cellular binding protein of isorhamnetin as potential anti-cancer target, we first synthesized 3′- O -substituted quercetin as isorhamnetin homologues and evaluated the growth inhibitory activity of these derivatives on breast, colon and prostate cancer cell lines. The preliminary results showed that the 3′- O modification did not affect the cytotoxic activity of the scaffold. Analysis of the co-crystal structure and the docking pose of isorhamnetin with reported binding protein of isorhamnetin or quercetin indicated the 3′- O -substitution groups located outside of the binding pocket, which is in accordance with activity of 3′- O derivatives. Then a biotin conjugate of isorhamnetin with a tetraethylene glycol (PEG) 4 linker at the 3′ position was synthesized and the resulting probe retained the anti-proliferative activity on cancer cell lines, while the cellular fluorescence analysis showed the distribution of probe inside the cells which indicated the probe had limited cell permeability. Finally, pull down assay both in situ inside cells and in the cell lysates indicated the isorhamnetin biotin probe was capable of protein labeling in cell lysates. These findings provide the isorhamnetin 3′- O -biotin probe as a tool to reveal the target proteins of isorhamnetin. Graphical
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PubMed
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Kanghui He,Qi Li,Yan Li,Bin Li,Shilin Liu
In this work, water-insoluble bamboo shoot dietary fiber (BSDF) was prepared, and used as plant food particle stabilizer for oil-in-water (O/W) Pickering emulsions. The obtained plant food particle had novel emulsification ability, the prepared emulsions were stable against coalescence for at least 4 weeks and also insensitive to pH, ionic strength and pasteurization conditions. The BSDF suspensions and BSDF-stabilized O/W emulsions both exhibited shear-thinning behaviors; moreover, both viscosity and module were increased with the increase of BSDF contents. The surface coverage of emulsions was positively correlated with the content of BSDF suspensions. It indicated that the dietary fibers from bamboo shoot had a soft nature and suitable shape to produce stable Pickering emulsions, which could be used as food-grade particles for applications of food and cosmetics industries.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yandong Xu,Mengxia Guo,Chengjun Ge,Ping Zhang,Wen Xu,Linlin Zhang,Shihao Zhou,Jianjun Liao
To facilitate the activation of peroxymonosulfate, it is useful to simultaneously tune the coordination environment of the single-atom catalyst and develop a structure that effectively exposes the active site. In this study, we used a pre-assembly calcination method to prepare a structure composed of Cu single atoms on O-doped g-C 3 N 4 nanosheets (5Cu-OCN), and studied how this structure can effectively activate PMS under visible light catalysis. Compared to the g-C 3 N 4 , the 5Cu-OCN exhibits significantly improved PMS activation effect. Cu single atoms play an important role in catalyzing PMS activation and removing carbamazepine from solution, and explain the contribution of photo generated electrons and holes in enhancing the performance of catalysts in PMS activation. Furthermore, the constructive cooperation of 5Cu-OCN photocatalysts by PMS activation and photocatalysis has been shown to be useful in real aqueous systems. The results indicate that the main pathway for the generation of 1 O 2 is through the 5Cu-OCN photocatalytic process to promote PMS activation. In addition, the active reaction species involved in the degradation of carbamazepine were identified. This study provides an efficient copper monoatomic catalyst that can react to visible light for 1 O 2 based advanced oxidation processes.
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高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Tian-Hong Jing,Kai-Chun Zhao,Guang-Hui Shi,Yi-Ying Zhuang,Xiao-Chao Chen,Xiao-Li Zhao,Yong Lu,Ye Liu
A series of bis-P,O-hybrid ligands ( L1–L4 ) were synthesized and characterized. The crystal structures demonstrated that the ligand of L2 , 1,4-bis((2-(diphenylphosphaneyl)phenoxy)methyl)benzene, not only acted as a typical trans -positioned diphosphine as observed in the complexes Pd( L2 )(OAc) 2 and Pd( L2 )Cl 2 , but also potentially as a P,P,O-tripodal pincer. As a result, under mild conditions (80 °C, 0.5–3.0 MPa), L2 enabled Pd(OAc) 2 to exhibit remarkable performance in terms of high activity and excellent regioselectivity ( l / b > 97/3) in the alkoxycarbonylation of vinyl arenes with the isolated yields of 57–91 %.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2019
·
IF 4.745
Na Li,Jinku Bai,Xiaolin Zheng,Honghua Rao
An iron-catalyzed methylene forming strategy is disclosed through sequential C–H and C–O bond functionalization of methanol with cosolvent water. This protocol provides an easy and novel access to methylene-tethered imidazo[1,2-a]pyridine and 2-aminopyridine analogues in a sustainable manner and represents a complementary approach to traditional methylene forming strategies.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Changyu Leng,Kang Sun,Jihui Li,Jianchun Jiang
Dead pine needle derived O, N codoped activated carbons were prepared by an easy one-step carbonization without adding any chemical reagents. The as-obtained PN-X samples had a high rate performance as electrodes for supercapacitors. It was due to the unique structure of cells in dead pine needles, abundant contents of metal elements (K, Na, Ca, Mg) and a large number of heteroatom contents (O, N). The role of different metal atoms and air for the formation of pores, and the mechanism of one-step carbonization were proposed. Micro/Meso/Macropores are beneficial to ion adsorption and transportation, and the doping O and N can improve physical and chemical properties of the carbon surface and increase electrochemical active sites to generate additional pseudocapacitance. All chemical and physical properties of PN-X samples were provided in detail. Especially, the PN-1000 showed a high specific capacitance of 223 F g–1 (178 F cm–3) at 0.5 A g–1 while it still had 150 F g–1 (120 F cm–3) even at 100 A g–1. The results suggested the unique PN-1000 to be a promising electrode material for supercapacitors in many practical applications.
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高影响因子
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