Inorganic Chemistry Frontiers
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2017
·Vol. 4
·期 9
·1533-1538
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IF 4.036
Ming Zhong,Xin Zhang,Dong-Hui Yang,Bei Zhao,Zhaojun Xie,Zhen Zhou,Xian-He Bu
In this work, a composite of 3D network nitrogen-doped porous carbon on reduced graphene oxide (denoted as NPC/rGO) was derived from pyrolysis of zeolitic imidazolate framework-8 and graphene oxide. The as-prepared NPC/rGO possesses high specific surface area, nitrogen doping and mesopores. When evaluated as the cathode catalyst for Li–O2 batteries, NPC/rGO exhibited higher specific capacity, better cyclability, and greater rate capability than either nitrogen doped porous carbon or reduced graphene oxide. The outstanding performances suggest that zeolitic imidazolate framework derived nitrogen doped porous carbon materials are promising for Li–O2 batteries.
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高影响因子
Food & Function
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2016
·Vol. 7
·期 11
·4683-4692
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IF 2.686
Fan Yuan-jing,Wei Wei,Luo Jian-ping,Jin Yu-xia,Dai Zi-ling
This study aimed to explore the effects of genistein on regulating the activation of UGTs via the Nrf2/Keap1 pathway and to elucidate the underlying mechanisms of detoxification and hepatic protection. Experiments monitoring genistein-induced protection against acetaminophen-induced cell damage were performed in L-02, HepG2 and Hep3b cells. The results of the MTT, AST, ALT, LDH, GSH and GSSG assays showed that genistein evidently protected the cells from acetaminophen-induced injury in a dose-dependent manner. The control cells were treated with 10 mM acetaminophen without genistein to compare with the effects of the combination of acetaminophen and genistein on the expression of UGT1A1, 1A6 and 1A9, Nrf2 and Keap1 mRNAs, as well as the expression of Nrf2 and Keap1 proteins, which were tested by western blotting. The results showed that the expression of the Nrf2 mRNA and protein increased; in contrast, the expression levels of the Keap1 mRNA and protein were obviously reduced by genistein in a dose-dependent manner. Meanwhile, the expression of the UGT mRNA was increased, and UGT1A9 exhibited the highest expression among the three UGTs. Accordingly, the residual acetaminophen content was obviously reduced and acetaminophen glucuronidation increased after 24 hours of treatment with genistein in a dose-dependent manner.
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PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2017
·Vol. 35
·期 7
·1098-1108
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IF 1.852
Fengjin Qu,Xiaoyan Ma,Yuchen Hui,Fang Chen,Yan Gao
In this study, chemical reduced graphene-silver nanoparticles hybrid (AgNPs@CR-GO) with close-packed AgNPs structure was used as a conductive matrix to adsorb enzyme and facilitate the electron transfer between immobilized enzyme and electrode. A facile route to prepare AgNPs@CR-GO was designed involving in β -cyclodextrin ( β -CD) as reducing and stabilizing agent. The morphologies of AgNPs were regulated and controlled by various experimental factors. To fabricate the bioelectrode, AgNPs@CR-GO was modified on glassy carbon electrode followed by immobilization of glucose oxidase (GOx) or laccase. It was demonstrated by electrochemical testing that the electrode with close-packed AgNPs provided high GOx loading ( Γ =4.80 × 10 −10 mol•cm −2 ) and fast electron transfer rate ( k s =5.76 s −1 ). By employing GOx based-electrode as anode and laccase based-electrode as cathode, the assembled enzymatic biofuel cell exhibited a maximum power density of 77.437 μW•cm −2 and an open-circuit voltage of 0.705 V.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huiting Lin,Yichang Ma,Xiaocan Wang,Guiqin Yi,Aimei Zhu,Qinglin Liu,Qiugen Zhang
Ether-free proton exchange membranes (PEMs) based on aromatic polymers are considered as potential alternatives to perfluorosulfonic acid (PFSA) PEMs due to their low cost, less reactant crossing, exceptional chemical stability and outstanding thermal stability. Herein, a series of high-performance sulfonated poly(biphenyl alkylene) (BPSA-PT- x ) membranes with full carbon chain backbones were synthesized to investigate the effect of different ratios of hydrophobic components on membrane properties. Among the prepared membranes, the BPSA-PT-10 % PEM with the highest proton conductivity (311 mS cm -1 at 80 °C water) possessed excellent dimensional stability (in-plane swelling rate ≤19.7 %, through-plane swelling rate ≤24.9 %), mechanical properties (elongation at break: 89.8 % in wet state), thermal stability (glass transition temperature >450 °C) and low H 2 crossover (1.80 mA cm -2 ). Further, the assembled H 2 /O 2 fuel cell based on BPSA-PT-10 % PEM exhibited competitive performance with a peak power density of 2.62 W cm -2 . The developed poly(biphenyl alkylene)-based PEMs should have potential applications in hydrogen energy field.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zining Man,Hao Tian,Xingbao Zhu,Zhe Lü
One experiment in this study utilized the plasticizer succinonitrile and lithium salt LiTFSI to directly create an ionic liquid electrolyte, with an artificial solid electrolyte interface layer generated using fluoroethylene carbonate. The typical electrolyte exhibited an ionic conductivity of 10–3 S cm–1 at room temperature and an electrochemical window of up to 5.3 V based on electrochemical impedance spectroscopy and linear sweep voltammetry tests. This electrolyte system effectively addresses the issues of decomposition and deterioration of traditional organic electrolytes in Li–O2 batteries at high voltages (over 4.5 V), as well as the problem of direct oxidation of the anode caused by oxygen shuttling, thereby greatly improving the lifespan of Li–O2 batteries. Additionally, the electrolyte’s low volatility and flame retardancy allowed for reliable operation of the battery in an air atmosphere. A Li–O2 battery assembled with the novel electrolyte was capable of cycling in a pure oxygen atmosphere for more than 1000 cycles at a capacity density of 200 mA h g–1 and over 150 cycles at 500 mA h g–1. Even when connected to ambient air without an additional oxygen selective membrane (OSM), the battery can still cycle continuously for more than 350 and 150 cycles at these two kinds of capacity density.
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高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
·
IF 4.7
Kai Li,Junqi Cai,Yue Tao,Yunhe Xing,Zuchao Zhu,Zhiqiang Lu,Xuming Zhang
The direct conversion of methane into the value-added chemical methanol using molecular oxygen was investigated via plasma catalysis under mild condition. An efficient synergistic effect between plasma and catalyst was achieved using an oxygen vacancy-rich ZnO/Al 2 O 3 catalyst. A high methanol selectivity of 48.5 % and a high synergy factor of 2.1 could be achieved simultaneously over ZnO/Al 2 O 3 R300 catalyst. The presence of oxygen vacancies played a crucial role in methanol formation. A close relationship between oxygen vacancy content and methanol selectivity was established. In situ DRIFT and optical emission spectra were employed to identify key intermediates, and a plausible reaction mechanism was proposed. The CH 3 and CH 3 O species were the key intermediates on the catalyst surface. The oxygen vacancy could efficiently adsorb the O radicals and accelerate the formation of CH 3 O species. This work offers insights into the rational engineering of efficient catalyst for plasma catalysis process.
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ELECTROANALYSIS
·
2018
·Vol. 30
·期 6
·1033-1040
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IF 2.851
Bo Li,Yongzhao Fan,Changqing Li,Xu Zhao,Kun Liu,Yuqing Lin
This study for the first time establishes a reliable non-enzymatic online electrochemical system (OECS) for selective and continuous measuring glucose in animal cerebral system. We proposed a one-step electrochemical method to synthetize a Cu nanostructure directly onto electrode, and over-oxidize it in NaOH to form acanthosphere-like CuOOH nanospheres (denoted as AN-CuOOH), which can serve as an excellent electrochemical catalyst for glucose oxidation and thus for simple and reproducible non-enzymatic glucose detection in strong alkaline solution. To validate the AN-CuOOH-based sensors for in vivo applications, we connect the sensors to a merged solution of in vivo microdialysis and 0.4 M NaOH to set up an OECS for in vivo glucose monitoring in rat brain. The response of this system has strong tolerance to the oxygen and pH fluctuation which may happen in the cerebral brain system during some physiological and pathological processes. The fabricated non-enzymatic OECS has a good linear current response to glucose within a concentration range from 10 to 1000 μΜ with sensitivity of 130.22 nA ⋅ μΜ −1 cm −2 . Additionally, the OECS is stable and does not suffer from the interference coexisting in the cerebral system. With the fabricated non-enzymatic OECS for glucose measurement, the basal level of glucose in the microdialysate from rats striatum was determined to be 248.63 μΜ (n=3). Furthermore, the glucose was clearly decreased to 26.37 % of the basal level when the rat was undergone by 20 min ischemia, and the glucose concentration was gradually restored to 99.15 % during 40 min of reperfusion. Our work propose a technically simple strategy for the fabrication of a highly reproducible non-enzymatic OECS system free from oxygen and pH interference, which is promising in exploring the molecular mechanism associated with brain functions.
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ENVIRONMENTAL TECHNOLOGY
·
2015
·
IF 1.56
Qunxing Huang,Xu Cai,Moussa Mallaye Alhadj Mallah,Yong Chi,Jianhua Yan
The high concentration of heavy metals in solid wastes may cause serious pollution during thermal treatment. We have investigated, theoretically and experimentally, the effects of several important flue gas species and mineral sorbents on the partitioning behaviour of four major heavy metals (cadmium, lead, zinc and copper) which are often present in municipal solid waste (MSW). Their concentrations in bottom ash, fly ash and flue gas were quantified when model MSW samples were treated thermally under different conditions. The evaporation ratio of the four metals, excluding Cu, increased with decreasing oxygen concentration. The presence of HCl promotes heavy metal evaporation by preventing the formation of stable metallic species, especially for Zn (evaporation of more than 20%). An increase in oxygen concentration has a negative influence on the effect of HCl. In the presence of SO2, Cd and Pb exhibited a higher evaporation ratio, while Zn and Cu were insensitive to the change. SO2 also inhibits Cd vaporization in an oxidative atmosphere. The effect of NH3 on reducing the metal volatilization rate was established indirectly. Calcium oxide addition enhances metal evaporation except for that of Zn (which shows a decrease of 38%). Although desulphurization by calcium injection decreases the volume of acid gas, calcium affects heavy metal pollution control adversely. The presence or addition of SiO2- or Al2O3-containing minerals can lead to the formation of stable metallic salts. This may favour the control of Cd, Pb, Zn and Cu volatilization up to 13%, 50%, 17.5% and 19%, respectively.
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PubMed
高影响因子
JOURNAL OF CATALYSIS
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2026
·
IF 6
Shiyi Li,Jie Zhang,Bei Liu,Wanchao Hu,Changli Lü
Solar-driven photocatalytic H 2 O 2 production presents a sustainable alternative to the industrial anthraquinone process. An in situ anthraquinone (AQ) functionalized metal–organic framework (UiO-66-F 4 ) with fluorinated linkers enables efficient concurrent synthesis of H 2 O 2 and value-added benzaldehyde (BzH) in a two-phase system. The AQ-modified F-MOF achieves exceptional H 2 O 2 production rates of 118.1mmol g -1 h −1 under visible light and 328.2mmol g -1 h −1 under simulated sunlight, along with high BzH selectivity (∼95%). Fluorinated linkers and AQ act synergistically to enhance the built-in electric field, promote charge separation, and facilitate oxygen adsorption and activation. RDE and RRDE studies verify a highly selective two-electron oxygen reduction pathway (94% H 2 O 2 selectivity) and reveal a non-traditional mechanism involving energy transfer to form electrophilic 1 O 2 , which is subsequently reduced to •O 2 – by electron and protonated to H 2 O 2 . Both experimental and theoretical results demonstrate that the 1 O 2 mediated pathway proceeds with a lower free energy barrier compared to the molecular oxygen route. Meanwhile, the incorporation of AQ reduces the oxygen adsorption energy and provides additional adsorption sites, further enhancing photocatalytic H 2 O 2 production. EPR spectroscopy corroborates the interconversion between 1 O 2 and •O 2 – during the reaction. This work offers mechanistic insight into the coexistence and interconversion of reactive oxygen species, while demonstrating spontaneous separation and collection of both H 2 O 2 and high-value oxidation products in a two-phase system.
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高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Kailing Sun,Mingrui Liu,Siyan Yu,Huiyu Song,Jianhuang Zeng,Xiuhua Li,Shijun Liao
The Li–O 2 battery is one of the most promising next-generation energy storage systems due to its super-high theoretical energy density . However, its further development is impeded by the current cathode system, which exhibits low energy efficiency and poor cycling stability. Herein, we report a composite of vanadium nitride coated with nitrogen-doped carbon nanoribbons grown in situ on carbon paper (denoted as VN@C) as a novel binder-free cathode for Li–O 2 batteries. We find that the nitrogen-doped carbon coating can significantly improve the stability of VN and enhance the composite's ORR/OER activities. The Li–O 2 batteries with our optimal VN@C-850 cathodes achieve an initial discharge capacity of 8269 mA h g −1 , a discharge-charge voltage gap of 0.88 V, and considerable cycling stability for 183 cycles with a cut-off capacity of 1000 mA h g −1 , compared with 2027 mA h g −1 , 1.21 V, and 12 cycles with uncoated VN cathodes.
研究领域:
电化学
·
能源材料
·
纳米材料
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电化学储能
·
先进电池技术
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiayu Xiao,Luo Hai,Ke Yang,Yuze Luo,Zefeng Wang,Junqin Li,Chunlei Ou,Li Wang,Le Deng,Dinggeng He
Reactive oxygen species (ROS) such as hydroxyl radicals ( OH) and singlet oxygen ( 1 O 2 ) have emerged as promising therapeutic agents for combating biofilm-associated bacterial infections. However, the hypoxic microenvironments in the biofilms severely hinder the ROS production. Herein, we have rationally integrated copper peroxide (CP) and indocyanine green (ICG) into a polydopamine (PDA) nanoparticle to construct a versatile hybrid nanoplatform (PDA/CP/ICG), which can enhance ROS generation for highly efficient biofilm elimination by relieving hypoxic microenvironment. When the PDA/CP/ICG accumulates at the infection site or biofilm, the acidic microenvironment triggers the co-release of Cu 2+ and H 2 O 2 , and the former can catalyze the conversion of self-supplied H 2 O 2 into OH via a Fenton-like reaction and consume the overexpressed antioxidant glutathione (GSH) to further promote the oxidative stress. Moreover, with the help of an 808 nm laser, the hyperpyrexia caused by PDA induces the decomposition of CP into O 2 that is immediately converted by ICG into 1 O 2 . The PDA/CP/ICG shows satisfactory antibacterial and antibiofilm effect due to the self-amplified production of OH and 1 O 2 , and outstanding wound healing with good in vivo biosafety. Overall, this study provides a facile paradigm in ROS-based biofilm elimination, and the proposed hypoxia-irrelevant bactericidal nanoplatform has great potential for future biomedical applications.
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高影响因子
SmartMat
·
2022
·
IF 0
Yajun Ding,Yuanchao Huang,Yuejiao Li,Tao Zhang,Zhong-Shuai Wu
The realization of high-efficiency, reversible, stable, and safe Li-O 2 batteries is severely hindered by the large overpotential and side reactions, especially at high rate conditions. Therefore, rational design of cathode catalysts with high activity and stability is crucial to overcome the terrible issues at high current density. Herein, we report a surface engineering strategy to adjust the surface electron structure of boron (B)-doped PtNi nanoalloy on carbon nanotubes (PtNiB@CNTs) as an efficient bifunctional cathodic catalyst for high-rate and long-life Li-O 2 batteries. Notably, the Li-O 2 batteries assembled with as-prepared PtNiB@CNT catalyst exhibit ultrahigh discharge capacity of 20510 mAh/g and extremely low overpotential of 0.48 V at a high current density of 1000 mA/g, both of which outperform the most reported Pt-based catalysts recently. Meanwhile, our Li-O 2 batteries offer excellent rate capability and ultra-long cycling life of up to 210 cycles at 1000 mA/g under a fixed capacity of 1000 mAh/g, which is two times longer than those of Pt@CNTs and PtNi@CNTs. Furthermore, it is revealed that surface engineering of PtNi nanoalloy via B doping can efficiently tailor the electron structure of nanoalloy and optimize the adsorption of oxygen species, consequently delivering excellent Li-O 2 battery performance. Therefore, this strategy of regulating the nanoalloy by doping nonmetallic elements will pave an avenue for the design of high-performance catalysts for metal-oxygen batteries.
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