PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Zhuowei Zhao,Meng Zhou,Wenjie Zhao,Jianfeng Hu,Heqing Fu
Polymer matrix composite with a physical barrier network can efficiently inhibit corrosion on carbon steel. In this paper, 3-(2-Aminoethylamino) propyldimethoxymethylsilane modified graphene oxide (A-GO) and glass fiber (GF) were incorporated into Epoxy (EP) matrix, and EP/GF/A-GO composite coating with dual physical barrier network was prepared. The electrochemical impedance spectroscopy (EIS) showed that the impedance modulus of EP/GF/A-GO composite coating was highest among the different coatings, indicting EP/GF/A-GO composite coating with dual physical barrier network could significantly enhance the corrosion protection properties. Even after 45 days of immersion, the value of impedance modulus of the EP/GF/A-GO composite coating was above 3.9 × 10 7 Ω cm 2 . Moreover, the anti-corrosion protection mechanism of EP/GF/A-GO composite coating was investigated. EP/GF/A-GO composite coating has excellent anti-corrosion protection performance.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2018
·
IF 4.862
Liangliang Xiong,Jianhua Liu,Mei Yu,Songmei Li
A two-dimensional nanocomposite, salicylaldehyde@ZIF-8/GO (SZG), was synthesized by anchoring the ZIF-8 nanoparticles containing the inhibitor salicylaldehyde (SA) on GO nanosheets for corrosion protection of AA2024 aluminum alloy. Its stimuli-responsive release of SA under acid and Al 3+ cations conditions was proved by UV–vis. Electrochemical impedance spectroscopy demonstrated that SZG nanocomposites prominently improved the protection properties of PVB coating by enhanced passive and active protection compared with the controlled samples. The enhanced passive protection derived from the two-dimensional structure of SZG, while inhibitor SA acted the active protection. Quantum chemical calculation clearly clarified the release and inhibition mechanisms of SA.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Fan Gao,An Du,Ruina Ma,Chuang Lv,Huazhen Yang,Yongzhe Fan,Xue Zhao,Jianjun Wu,Xiaoming Cao
Acrylic coatings composed of modified MoS 2 nanosheets (MMN) were successfully prepared on the surface of galvanized sheets. Bulk MoS 2 was successfully exfoliated and modified using the ultrasonic method. Then, the effects of MMN on the morphology, composition , and corrosion resistance of the composite coatings were analyzed. Scanning electron microscopy results showed that MMN reduced the number of cracks in the coatings and made the coatings more compact. Furthermore, the coating corrosion resistance was significantly enhanced. Polarization curves showed that the corrosion current density was reduced by nearly two orders of magnitude by preparing the coating with 0.2 g/L of MMN (sample C M-0.2 ). Electrochemical impedance spectroscopy results also demonstrated that the barrier performance was stronger for the MMN composite coating.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yanchen Lai,Bowen Wang,Bingfeng Zu,Chasen Tongsh,Zhengguo Qin,Qing Du,Shangfeng Jiang,Kui Jiao
Clarifying the mass transfer mechanism of direct ammonia fuel cell (DAFC) can provide theoretical support for solving its complex water and heat management problems. Electrochemical impedance spectroscopy (EIS) as an electrochemical measurement technique that can characterize the losses in various parts of an electrochemical system, but it’s rarely used in DAFC experimental research. Therefore, this study proposes an EIS equivalent circuit model for low-temperature DAFC, which is used to quantitatively characterize the Faradaic impedance, Ohmic impedance, and mass transfer impedance of cells, meanwhile, the model takes into account the influence of solution aggregation in the anode diffusion layer (ADL). This study prepares 3 ADLs with different water contact angles and explores the influence of ADL hydrophobicity on DAFC performance through fitting between equivalent circuit model and experimental results. We find that DAFC with moderately hydrophobicity ADL which water contact angle of 126.5° exhibits better electrochemical performance, with peak power density of 10.07 mW cm −2 . As hydrophobicity decreases, water contact angle reduces to 100.9°, the solution aggregation phenomenon occurring at ADL becomes severe, which in turn increases the Ohmic impedance of 160 mΩ cm 2 and reduces cell performance. The cell with ADL water contact angle of 142.7° doesn’t exhibit solution aggregation in diffusion layer, its Ohmic impedance reduces by 270 mΩ cm 2 compare to the cell with ADL water contact angle of 126.5°, but its performance decrease to 9.23 mW cm −2 due to insufficient reactant supply. This study also explores the influence of ADL hydrophobicity on DAFC output stability. This achievement can enrich the theory of DAFC testing and to some extent fill the gap in the study of DAFC mass transfer mechanism.
研究领域:
能源科学
·
电化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 47
·37574-37580
·
IF 3.84
Chao-Feng Du,Lei Jiang,Lei Sun,Nian-Yu Huang,Wei-Qiao Deng
We synthesized a D–π–A–π–A type dye and demonstrated its application in dye-sensitized solar cells (DSSCs). This D–π–A–π–A type dye, named C321, consisted of a triphenylamine as a donor, a 3,4-ethylenedioxythiophene (EDOT) as a π-bridge, and a benzothiazole (BTDA)–phenyl-cyanoacrylic acid as an A–π–A group. Compared with DSSCs based on a traditional D–π–A type dye C311, the DSSCs based on C321 exhibited a significant enhancement of cell performance. A power conversion efficiency of 8.2% was achieved for DSSCs based on C321, which was 9 times higher than that for DSSCs based on C311 (0.9%). The theoretical calculations and electrochemical impedance spectroscopy investigations revealed the mechanism of the enhancement of cell performance.
研究领域:
材料科学
·
能源技术
·
有机化学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 4
·1381-1393
·
IF 2.8
Zeng Yong,Wang Keliang,Ke Xiang,Tan Xiaoqing,Jiang Bo,Zhu Weichen,Xiao Rengui
Compared with Li-ion batteries, dual-graphite batteries (DGBs) have low cost, easy handling, and renewable advantages. However, DGBs with pure ionic liquid as the electrolyte (LEDGBs) suffer from high self-discharge rate (SDR). Here, a gel polymer electrolyte (ILGPE) was prepared using polyvinylidene fluoride as the polymer matrix and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide as the electrolyte and assembled into a gel polymer double-graphite battery (IGDGB). The results show that the IGDGB has an initial discharge capacity of 34.9 mAh g -1 , and SDR is only 3.63%/h lower than the LEDGB (25.07%/h) after resting for 3 h. Notably, even after resting for 10 h, the IGDGB still has a discharge capacity of 27.5 mAh g -1 . Meanwhile, the electrochemical impedance spectroscopy analysis results indicate that the low SDR of IGDGB is due to the limiting effect of ILGPE on the carrier strength. This result provides an idea of self-discharge reduction strategy for other electrochemical energy storage systems with intercalation storage mechanism.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2021
·Vol. 27
·期 11
·4673-4686
·
IF 2.817
Zhang Lei,Zhang Xuping,Wang Li,Zhuang Quanchao,Ju Zhicheng,Cui Yanhua
LiMn 0.8 Fe 0.2 PO 4 by coating with carbon and reducing the particle size to nanometric scale can be used as a superb cathode material for lithium-ion batteries. In this study, LiMn 0.8 Fe 0.2 PO 4 /C composite is synthesized by high-energy milling method, and the charge and discharge test results show that it has high capacity and good cycle stability. The electrochemical impedance spectra (EIS) of LiMn 0.8 Fe 0.2 PO 4 /C cathodes are obtained in the initial lithiation and delithiation process. It is found that the Nyquist plots of LiMn 0.8 Fe 0.2 PO 4 /C cathodes mainly consist of three parts in the lithiation and delithiation process, namely, high-frequency semicircle, middle-frequency semicircle, and low-frequency line. The above three parts are assigned to Schotty contact problem, charge transfer step, and lithium-ion solid-state diffusion process, respectively. A quantitative analysis of the variations of the resistance and barrier capacitance of Schotty contact with the polarization potential of the electrode and a reasonable explanation is given, as well as the resistance and space charge layer capacitance of charge transfer. Moreover, the change of n (a parameter in constant phase angle element (CPE) with a value between − 1 and 1) value is briefly discussed.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2018
·
IF 6.042
Meng Zhang,Qingyu Zhai,Liping Wan,Li Chen,Yu Peng,Chunyan Deng,Juan Xiang,Jiawei Yan
Layer-by-layer dissolution and permeable pore formation are two typical membrane damage pathways, which induce membrane function disorder and result in serious disease, such as Alzheimer’s disease, Keshan disease, Sickle-cell disease, and so on. To effectively distinguish and sensitively monitor these two typical membrane damage pathways, a facile electrochemical impedance strategy was developed on a porous self-assembly monolayer (pSAM) supported bilayer lipid membrane (BLM). The pSAM was prepared by selectively electrochemical reductive desorption of the mercaptopropionic acid in a mixed mercaptopropionic acid/11-mercaptoundecanoic acid self-assembled monolayer, which created plenty of nanopores with tens of nanometers in diameter and several nanometers in height (defined as inner-pores). The ultralow aspect ratio of the inner-pores was advantageous to the mass transfer of electrochemical probe [Fe(CN)6]3–/4–, simplifying the equivalent electric circuit for electrochemical impedance spectroscopy analysis at the electrode/membrane interface. [Fe(CN)6]3–/4– transferring from the bulk solution into the inner-pore induce significant changes of the interfacial impedance properties, improving the detection sensitivity. Based on these, the different membrane damage pathways were effectively distinguished and sensitively monitored with the normalized resistance-capacitance changes of inner-pore-related parameters including the electrolyte resistance within the pore length (Rpore) and the metal/inner-pore interfacial capacitance (Cpore) and the charge-transfer resistance (Rct-in) at the metal/inner-pore interface.
研究领域:
生物物理学
·
分析化学
·
医学
✓ 已验证
DOI
高影响因子
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2020
·
IF 0.512
Le Lv,Wei Liu
Sol-gel method is the most popular way for the preparation of organic-inorganic hybrid anticorrosion coatings. Such sol-gel coatings is environmental friendly and chemical stable, showing enhanced corrosion resistance for metal substrates. Here, a saline with aniline substituted group N-(3-(trimethoxysilyl)propyl)aniline (TMPA) has been used together with tetraethyl orthosilicate (TEOS) for the preparation of organic-inorganic hybrid coating (OIHC) materials by sol-gel approach. Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements show that the hybrid coatings exhibit high corrosion resistance on aluminum substrates.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Shan Wan,Xiao-Ze Ma,Chun-Hui Miao,Xin-Xin Zhang,Ze-Hua Dong
Initial atmospheric corrosion of clean copper and NaCl-deposited copper was investigated by quartz crystal microbalance and electrochemical impedance spectroscopy. 2-phenyl imidazoline (2-PI) exhibits increasing inhibition efficiency with temperature on chloride-induced atmospheric corrosion of Cu. However, on the NaCl-deposited Cu, adsorption amount of 2-PI is much higher than that on clean Cu possibly due to that rough corrosion products entrap lots of 2-PI molecules. The adsorption of 2-PI on corroded Cu is suggested to obey a capillary condensation and entrapment mechanism, but in dry argon atmosphere, it obeys a simple pseudo first-order model for lack of corrosion products.
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2024
·Vol. 31
·期 10
·3463-3481
·
IF 3.7
Ji Wen-hui,Cao Lin,Ji Xiao-hong,Peng Li-ming,Myronyuk Oleksiy,Han Dong-xiao,Pei Yan-tong,Li Wei-hua,Wang Wei
In this paper, 1-butyl-3-methylimidazole tetrafluoroborate ([BMIM]BF 4 ) is used as corrosion inhibitor. Polyacrylonitrile (PAN) is used to load the corrosion inhibitor. PAN/[BMIM]BF 4 hybrid nanofibers are successfully synthesized by electrospinning technology. The alkyd varnish is coated on the fiber membrane to prepare a composite coating, and then a series of tests are carried out on the self-healing and anticorrosive performance of the composite coating. It is observed by scanning electron microscope that the fiber morphology is stable and there is no bead-like structure. The composition of the composite fiber is analyzed by Fourier infrared spectroscopy, and it is confirmed that the hybrid nanofiber was successfully prepared. 3D laser confocal scanning microscope was used to observe the corrosion morphology and profile of the carbon steel. The composite coating shows good self-healing performance. [BMIM]BF 4 can form a protective film on the surface of the bare carbon steel substrate through physical adsorption or chemical adsorption in an alkaline environment. Electrochemical impedance spectroscopy was tested and analyzed. It is found that the maximum corrosion inhibition efficiency of the coating is 88.5% in 3.5 wt.% alkaline NaCl solution. Compared with the blank coating without nanofibers, the composite fiber varnish composite coating exhibits good self-healing and anti-corrosion properties.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Meng Yuan,Xiaoman Zhang,Jun Kong,Wenhui Zhou,Zhengji Zhou,Qingwen Tian,Yuena Meng,Sixin Wu,Dongxing Kou
Both recombination and band-edge shift are important factors for the open-circuit voltage ( V oc ) improvement of metal chalcogenide hole-transport material (HTM) based perovskite solar cells, but it is still not clear that which aspect plays the dominant role in such devices. Herein, we addressed this aspect through employing the band-tunable metal chalcogenide Cu 2 ZnSnS 4 (CZTS) QDs as HTM into perovskite solar cells . By replacing sulfur with selenium atom , the band gap of HTM was tuned from 1.64 eV to 1.14 eV and their influences on cell performances were further discussed. Though the Cu 2 ZnSnSe 4 (CZTSe) device with higher hole transport ability could improve the fill factor (FF), its V oc was still remarkably lower than that of the CZTS device. Electrochemical impedance spectroscopy (EIS) measurements indicated that the V oc loss (45 mV) induced by recombination here was far less than the V oc differences between the two devices (140 mV). After analyzing the band level alignment at TiO 2 /CH 3 NH 3 PbI 3 /HTM heterojunction, we proposed that the V oc enhancement of CZTS device was mainly ascribed to the more downward valence band-edge shift of HTM. This further approves that developing a wide band gap material without hindering charge injection is more pressing rather than depressing recombination process for future metal chalcogenide HTM researches.
研究领域:
材料科学
·
能源研究
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）