JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Yiyang Cui,Kai Zheng,Ruoqing Sun,Zhiwei Yuan,Dengfeng Guo,Juan Xu,Xiaofei Yu,Jian Zang,Jianyu Cao
Aqueous phenazine redox flow batteries hold great potential in large-scale energy storage. The chemical/electrochemical properties of phenazine compounds are greatly influenced by their functional groups and electrode catalytic materials. In this study, we present a facile synthesis of the multi-substituted phenazine derivative containing hydroxyl, methyl and carboxyl groups, namely, 7(8)-hydroxy-8,9(6,7)-dimethylphenazine-2-carboxylic acid (HDMPC), which serves as an anolyte material and exhibit sufficient negative redox potential, quasi-reversible redox kinetics, and high aqueous solubility in LiOH aqueous electrolyte with moderate alkalinity. Pairing with lithium ferrocyanide catholyte in 1 M LiOH (pH∼12.3), with the promotion of a carbon-supported CuO electrocatalyst, the HDMPC anolyte delivers a high open circuit voltage of ∼1.16 V, average energy efficiency of 80.23 % and a low temporal fade rate of ∼0.0086 % per cycle (equivalent to ∼0.38 % per day) for over 200 cycles at 20 mA cm −2 . The post-analysis further reveals that tautomerization of the charged HDMPC rather than crossover, is responsible for most of the fade of cycling capacity during electrochemical cycling.
研究领域:
能源材料化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hanzi Liu,Changfu You,Haiming Wang
Transient in-situ IR spectroscopy was performed to analyze the molecular behavior of selective catalytic reduction of NO with NH 3 on V 2 O 5 -WO 3 /TiO 2 catalyst. During NH 3 adsorption, an unexpected growth in the intensity of Lewis acid sites was observed due to the hydrogen migration, which was verified by the DFT calculation and the existence of intermediate species. The comparison between the isolated atmosphere experiments and the simultaneous exposure of NH 3 -NO-O 2 on catalytic monolayer demonstrated that: (i) there exists a pathway for Lewis to Brønsted acid sites transformation at T > 300 °C, (ii) the rate determining step of the SCR cycle involves in the re-oxidation of acid sites by O 2 at 200–300 °C. Generally, the Lewis acids are crucial at high temperatures, while Brønsted acids dominate the overall reaction at lower temperatures. Based on the experimental data and the DFT calculation, a mechanism for ammonia adsorption, acidity conversion and re-oxidation for the redox loop of the de-NOx reaction was proposed. The findings shed light on the understanding of relative strength of NO reduction and acid re-oxidation at different temperatures.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 2.368
Qing Xu,Jianbo Guo,Chunmei Niu,Jing Lian,Zhenghao Hou,Yankai Guo,Shaoying Li
This study investigated the denitrification characteristics and practical applications of PET–CAs (chloroanthraquinones immobilised on polyethylene terephthalate), which are novel functional biocarriers. The PET–CAs were characterized using Fourier transform infrared spectroscopy (FT-IR) and energy dispersive spectrometry (EDS). Among the PET–CAs, PET-1,8-DCA (PET modified by 1,8-dichloroanthraquinone) was the best functional biocarrier for accelerating the denitrification process with approximately 0.14 mmol anthraquinone. The denitrification process was pseudo-zero order, with C NO3 − = 175.64–19.28 t and R 2 = 0.9715. The pH of the PET-1,8-DCA system increased and ultimately reached 9.7. The stabilized ORP value with PET-1,8-DCA was approximately 70 mV lower than that of the control with PET . This study explored a novel design concept for the immobilization of quinone.
研究领域:
环境生物学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 7
·1-11
·
IF 1.434
Gao Baojiao,Zhang Dandan,Li Yanbin
A special redox surface-initiating system, tertiary aromatic aniline/BPO (benzoyl peroxide, BPO), was constituted at the interface between polysulfone (PSF) microfiltration membrane and an organic solution, in which the monomer glycidyl methacrylate (GMA) and BPO were dissolved, and the graft-polymerization of GMA on the porous membrane of PSF was smoothly carried out by the initiating of the surface initiating system, getting the grafted membrane PSF- g -PGMA, which is a precursor of many functional composite membranes. The microfiltration membrane of chloromethylated polysulfone (CMPSF) was first prepared by the method of immersion-precipitation phase transformation; subsequently the CMPSF membrane was modified with 3-hydroxy-N,N-diethylaniline (HDEA) as reagent, and through the nucleophilic substitution reaction between the chloromethyl group on CMPSF membrane and the hydroxyl group of HDEA, tertiary aromatic aniline group DEA was bonded on the PSF microfiltration membrane, obtaining the modified membrane PSF-DEA; finally, the graft-polymerization of GMA was successfully realizing by the surface-initiating system of DEA/BPO, getting the grafted porous membrane PSF- g -PGMA. The grafted membrane was characterization by FTIR and SEM. The experimental results show that the reaction between the chloromethyl group on CMPSF membrane and HDEA in the solution belongs to unimolecular nucleophilic substitutions. For the graft-polymerization of GMA, the appropriate temperature is 70 °C, the suitable mass percent concentration of GMA in solution is 5%, and the optimal concentration of BPO is 1.5% of monomer GMA mass. For the grafted membrane PSF- g -PGMA prepared under the optimal reaction conditions, the grafting degree of PGMA can reach 0.86 g/cm 2 .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 21
·
IF 1.86
Xiaoya Jiang,Xiaoyan Jiao,Doudou Zhang,Ligai Bai,Haiyan Liu,Hongyuan Yan
A polymer monolithic column was prepared via redox system in a stainless steel column (50 × 4.6 mm i.d.) by using 1,6-hexanediol diacrylate as monomer and ethylene dimethacrylate as cross linking agent. Characteristics of the homemade monolithic column were investigated by scanning electron microscopy, nitrogen adsorption-desorption and mercury intrusion porosimeter, respectively. The results showed that the resulting monolithic column occupied relative uniform porous skeleton structure. Furthermore, the monolith was tested by separating aromatic compounds in conjunction of high performance liquid chromatography with the highest column efficiency of more than 21,000 plate per meter, which was relative high for polymer-based monolithic column with 4.6 mm i.d. At last, the monolithic column was used to simultaneously separate and quantitatively analyzes five active compounds in Chinese herb Rheum palmatum L. The validation of the method was carried out, which indicated that the accuracy represented by recovery was in the range of 98.48% to 101.57%. Limit of detection and limit of quantification for the five active compounds were less than 33.7 ng and 90.8 ng, respectively. All the results indicated that the present method was simple and efficient for quantitative analysis of the five active compounds from Chinese herb Rheum palmatum L. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44874.
研究领域:
分析化学
·
中药学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yang Feng,Gang Wang,Liyuan Wang,Jingge Ju,Weimin Kang,Nanping Deng,Bowen Cheng
Owing to high energy density , lithium sulfur (Li–S) battery is regarded as one of the most promising candidates for future energy storage. However, “shuttle effect” and sluggish redox kinetics of lithium polysulfides impede its practical application. Herein, a novel g-C 3 N 4 /Co-based MOFs derived chestnut-like superstructure (Co/CNT@DCNS) was prepared to act as the component of interlayer through a low-temperature one-step carbonization strategy. The prepared superstructure was constructed by the strong catalysis of 0D Co nanoparticles , high conductivity of 1D CNTs and excellent polysulfides adsorption of 2D defect C x N y nanosheets, which could not only ensure the rapid electrons/ions transport and fast redox kinetics, but also provide sufficient spaces for accommodating the volume expansion of active materials. Therefore, the cells with the prepared interlayer exhibited stable performances with an initial capacity of 1348.3 mAhg −1 and an extended cycling stability of 0.04% per cycle during the 1000 cycles at 1C. Even at a high sulfur loading of 3.1 mg cm −2 , a specific capacity of 691.7 mAh g −1 can be maintained after 500 cycles at 0.5C. This work shares a convenient and safe strategy for the synthesis of multi-dimension, dual-functional and stable superstructure interlayer for advanced Li–S batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Haijun Ji,Hui Yang,Yan Wan,Liwei Li,Jiaqi Wang,Xin Zhang,Jie Yu,Xinxin Zhou,Runguo Wang,Liqun Zhang
In the rubber industry, the substitution of traditional engineering rubbers derived from fossil resources with novel biobased elastomers is considered for sustainable development, which largely relies on a straightforward and environmentally friendly synthesis procedure and the availability of material properties. In the research, semi-biobased elastomers, poly(dibutyl fumarate-co-butadiene)s (PDBFBs), were prepared by redox emulsion polymerization of dibutyl fumarate obtained from fumaric acid esterified with n-butanol and partially petroleum-derived butadiene. The microscopic structures of PDBFBs were verified by FTIR, NMR, and GPC analyses. The Tg values of PDBFBs were in the range of −73 and −58 °C. Additionally, the reactivity ratios of two comonomers in PDBFBs were evaluated by two methods: the Fineman–Ross and Kelen–Tüdös methods. The macroscopic properties of semi-biobased elastomers, such as thermal and mechanical performances, were meticulously regulated via molecular design. To achieve the desired properties, silica was incorporated into the PDBFBs to prepare strong nanocomposites. These nanocomposites displayed adequate tensile strength (14.3–31.6 MPa), adequate elongation at break (338–457%), low rolling resistance, and excellent thermoresistant oxygen aging performance. These results showed that PDBFB nanocomposites possessed quite good properties and had the potential for practical applications. This work provides a facile, efficient, solvent-less green synthesis route to design new-generation promising sustainable engineering elastomers for the rubber industry.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Lidong Gong,Changrong Wang,Pengcheng Xu,Jingjing Gong,Chuanda Zhu,Shiming Di,Yanglonghao Li,Yongxu Mu,Hongbin Han,Qiang Zhang,Zhiqiang Lin
Bioresponsive nanomaterials are increasingly important in a variety of applications such as disease imaging, drug delivery, and tissue engineering. However, it remains a big challenge to manipulate response efficacy of such materials for performance optimization in a highly complex milieu in vivo. Here, we developed chemically adjustable nanoreactors (CANs) with the structure of polymeric cores and albumin shells to achieve tunable redox responsivity. In vitro characterization demonstrates stable, spherical nanoparticles of the CANs with a particle size of about 50 nm. The fluorescence activation ratios of the CANs are determined by various albumin modification densities on the shell. Meanwhile, the response sensitivity of the CANs to GSH levels (0.6–4 mM) can be tuned by acid–base properties of polymeric blocks in the core. This unique tunable redox responsivity enables the CANs suitable for probe optimization in cancer imaging both in vivo and at histological levels. Overall, this study offers a new design strategy for manipulation on performance of core/shell nanoreactors or bioresponsive nanomaterials.
研究领域:
生物材料学
·
医学工程
·
分子影像学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Karthick Ramalingam,Yuchao Zhu,Jian Wang,Mengjun Liang,Qiang Wei,Xuncai Chen,Fei Sun,Deyang Chen,Zhang Zhang,Su Htike Aung,Than Zaw Oo,Fuming Chen
Both low-energy consumption and high salt removal rate are highly required in the electrochemical desalination. In this work, a conducting polymer poly(3,4-ethylene-dioxythiophene), i.e., PEDOT, is electrochemically decorated on a graphite foil as an electrode material of redox-flow desalination (RFD). At a current density of 2 mA·cm–2, the energy consumption of the RFD is reduced to 38.1 kJ·mol–1 with PEDOT-modified electrodes, compared with 154.5 kJ·mol–1 using a bare graphite electrode. Meanwhile, the salt removal rate is enhanced to 1.54 μmol·cm–2·min–1 using the PEDOT electrode from 1.11 μmol·cm–2·min–1 in the bare graphite electrode. The PEDOT electrodes can also provide excellent cycling stability. The improved performance may be due to the promising conductivity and porous structure of PEDOT, which would supply more active sites between the electrode and the redox electrolyte. The current research provides an electrochemical desalination strategy with low energy consumption and high salt removal rate, which is significant for the development of RFD technology.
研究领域:
环境科学
·
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Lin Chen,Tingting Fan,Min Yang,Dunfeng Si,Haotian Wu,Song Wu,Jian Xu,Dongmei Zhou
Microplastics weathering by various types of oxidants in the oxic environment and their interaction with environmental contaminants have drawn numerous scientific attention. However, the environmental fate of microplastics under a reducing environment has been largely unresolved. Herein, the change of physicochemical and redox properties of microplastics during the weathering under a sulfate-reducing environment and the interaction with arsenite were addressed. The sulfurization of phenol-formaldehyde resin microplastics under a sulfate-reducing environment generated smooth and porous particles with the induction of organic S species. Multiple spectroscopic results demonstrated thioether and thiophene groups formed by the substitute removal of O-containing functional groups. Moreover, the sulfurization process induced the reduction of carbonyl groups and oxidation of phenolic hydroxyl groups and resulted in the formation of semiquinone radicals. The O-containing functional groups contributed to microplastics redox property and As(III) oxidation while S-containing functional groups showed no obvious effect. The sulfurized microplastics had lower efficiency in mediating arsenite oxidation than the unsulfurized counterparts due to the decreased electron donating capacity. Producing hydrogen peroxides by electron-donating phenol groups and semiquinone radicals and the direct semiquinone radicals oxidation could mediate arsenite oxidation. The findings of this study help us understand the fate of microplastics in redox fluctuation interfaces.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Yannan Ma,Yong Chen,Chengwen Xin,Yanqiong Cheng,Qianqi Li,Hui Xu
Redox electrolytes bridge the energy density gap between carbon-based supercapacitors and batteries. However, across-diffusion of soluble redox couples results in subpar rate performance, therefore, how to deal with this impasse becomes the focus of the field’s attention. In this study, we put forth the idea that the problem can be solved by using activated carbon nanopores as reservoirs to retain redox species and prevent their diffusion. The electric field is used to help confine sodium anthraquinone-2-sulfonate (AQS, size is around 1.634 × 0.634 × 0.864 nm3) to the nanopores of the tea-leaf biomass carbon electrode (TAC, 59.65% of micropores). We show that AQS molecules occupy small micropores (less than 1 nm), resolving the problem of cross-diffusion that arises naturally in redox-enhanced electrochemical capacitors. Thus, in the 1 M H2SO4 electrolyte, a high specific capacitance of 733.3 F g–1 is produced in a three-electrode system at a current density of 1 A g–1, and only 7% of the specific capacitance decays at a current density of 10 A g–1. Besides, the TAC/AQS-5 electrode-based symmetric device delivers a maximum energy density of 41.48 Wh kg–1 and excellent capacitance retention of 86.2% after 5000 charge and discharge cycles at 2 A g–1. The maximum energy density obtained by our symmetrical supercapacitor is higher than that of currently reported aqueous electrolyte supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Biomedicines
·
2023
·Vol. 11
·期 6
·1743
·
IF 4.7
Xuelian Zhou,Xuefeng Chen,Li Zhang,Jinna Yuan,Hu Lin,Mingqiang Zhu,Xiaoqin Xu,Guanping Dong,Junfen Fu,Wei Wu
Objective:To investigate the role of mannose-binding lectin (MBL) in modulating autophagy and protecting endothelial cells (ECs) from oxidized low-density lipoprotein (ox-LDL)-induced injury.Methods:Serum MBL concentration and carotid intima-media thickness (cIMT) were measured in 94 obese and 105 healthy children. ECs were transfected with MBL over-expression plasmid, LOX1 was knocked-down to explore the protective role of MBL in ox-LDL induced ECs injury. Dendritic cells (DCs) were co-cultured with ECs, and inflammatory factors, DC maturation, and autophagy was assessed. WT and ApoE−/−mice were fed with a high fat diet (HFD) with or without MBL-adenovirus injection for 16 weeks and aortic vascular endothelial tissue was isolated, then atherosclerotic plaque, cell injury and autophagy were analyzed.Results:Serum MBL concentration in obese children was lower than healthy controls and was negatively correlated with cIMT. The uptake of ox-LDL was decreased in LOX1 knock-down ECs. MBL over-expression in vitro inhibited LOX1-ox-LDL binding. Both LOX1 knock-down and MBL over-expression can ameliorate EC autophagy and cell injury. MBL over-expression in vivo alleviated atherosclerotic plaque formation, influenced DC maturation and down-regulated IL-6, IL-12, and TNF-a levels.Conclusions:MBL exerts a protective role in ox-LDL-induced EC injury by modulating DC maturation and EC autophagy via inhibiting LOX1-ox-LDL binding.Keywords:mannose-binding lectin;endothelial cells injury;autophagy;LOX1;atherosclerosis
研究领域:
心血管疾病
·
细胞生物学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）