Alexandria Engineering Journal
·
2023
·
IF 6.8
Nengli Xiao
The use of conductive polymers with excellent electrochemical properties and environmental friendliness is becoming increasingly important in the field of metal corrosion inhibition. To this end, a polypyrrole anticorrosive coating was synthesized on the surface of structural steel Q235 via potentiostatic deposition. By altering the deposition potential value in a stirred ice bath, the best deposition performance was achieved. It was found that potentiostatic deposition could yield effective anticorrosive coatings over a wide voltage range. The electrochemically deposited films were all Ppy films with C 2 O 4 2- . This proposed coating has extended the lifespan of metal materials in civil engineering applications.
研究领域:
材料科学
·
防腐蚀工程
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2022
·Vol. 12
·期 3
·383
·
IF 2.695
Hetao Zhu,Xiaoyan Liu,Hua Hao,Xingwen Zheng
Plasma discharging treatment (hydroxylation) was conducted on copper surfaces for the subsequent electro-polymerization procedure of polypyrrole (PPy) coating (d-PPy). The hydroxylated surface could solve the criticized adhesion strength and protection efficiency of electropolymerized coatings for metal substrate in corrosive media. Compared with the counterpart obtained via passivation pretreatment (p-PPy), a well-adhered d-PPy layer was acquired on the hydroxylated copper surface, which earned a satisfactory adhesion grade, compactness and conductivity. Appreciable protection of d-PPy was measured for copper in the artificial seawater (ASW) at 298 K via electrochemical and surface analyses. Results of electrochemical measurements indicated that d-PPy coating effectively retarded copper corrosion in ASW with a lowered corrosion current density and improved charge transfer resistance. Surface analysis revealed that the typical morphology of PPy was retained after 240 h immersion in ASW. A favorable physical barrier and anodic protection efficacy might account for the superior protection of d-PPy coating for the underlying copper. Molecular dynamics simulations for the deposition of PPy chains on pristine and hydroxylated copper planes provided a definite correlation between the theoretical calculations and experimental observations. Theoretical modelling also disclosed in-depth the anchoring nature and anticorrosive mechanism for PPy toward the hydroxylated copper in ASW.
研究领域:
材料科学
·
电化学
·
防腐蚀工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shengjie Liang,Mengyuan Hu,Baoe Li,Dan Xia,Chunyong Liang,Feng Peng,Donghui Wang
Bacterial infections around implants constitute a significant cause of implant failures. Early recognition of bacterial adhesion is an essential factor in preventing implant infections. Therefore, an implant capable of detecting and disinfecting initial bacterial adhesion is required. This study reports on the development of an intelligent solution for this issue. We developed an implant integrated with a biosensor electrode based on alternating current (AC) impedance technology to monitor the early growth process of Escherichia coli (E. coli) and its elimination. The biosensor electrode was fabricated by coating polypyrrole (PPy) doped with sodium p-toluenesulfonate (TSONa) on titanium (Ti) surfaces. Monitoring the change in resistance using electrochemical impedance spectroscopy (EIS), combined with an equivalent circuit model (ECM), enables the monitoring of the early adhesion of E. coli. The correlation with the classical optical density (OD) monitoring value reached 0.989. Subsequently, the eradication of bacteria on the electrode surface was achieved by applying different voltages to E. coli cultured on the electrode surface, which caused damage to E. coli. Furthermore, in vitro cellular experiments showed that the PPy coating has good biocompatibility and can promote bone differentiation.
研究领域:
生物医学工程
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材料科学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Jingwen Liao,Yu Zhang,Guoxin Tan,Chengyun Ning
Conducting polymer coatings have unique property and performance allowing potential application in various fields. In this article, we fabricated a nanostructured polypyrrole (PPy) coating on biomedical titanium via template-free electrochemical polymerization in a phosphate buffer solution (PBS). Field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM) were utilized to observe the morphology of nanostructured PPy coatings. Raman spectra and X-ray photoelectron spectroscopy (XPS) were employed to characterize the molecular structure and element composition of the obtained product. The results showed that conducting PPy coatings of high roughness, with aligned nanofibrous structure and inner diameter of 20 ± 5 nm, have been successfully fabricated on titanium. Moreover, the morphology of nanostructured PPy coatings could be regulated with the reaction time varying.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Pengju Zhang,Junying Weng,Zhengkun Lu,Longchen Li,Bingyang Ji,Minghui Ding,Yiran Sun,Wenyong Yuan,Pengfei Zhou,Hailin Cong
P 2-Na 0.67 Mn 0.67 Ni 0.33 O 2 is a promising cathode material for sodium ion batteries (SIBs) due to its low cost, high theoretical capacity, and non-toxicity. However, it still suffers from unsatisfactory cycling stability mainly incurred by the Jahn-Teller effect of Mn 3+ and electrolyte decomposition on the electrode/electrolyte interface. Herein, the P 2-Na 0.67 Ni 0.33 Mn 0.67 O 2 @PPy (NNMO@PPy) composite applied as cathode materials for SIBs is obtained by introducing conductive polypyrrole (PPy) as coating layer on the P 2-Na 0.67 Ni 0.33 Mn 0.67 O 2 (NNMO) microspheres. Numerous physical characterization methods indicate that the PPy layer was uniformly coated on the surface of NNMO microspheres without change in phase structure and morphology. The PPy coating layer can alleviate Mn dissolution and effectively suppress the side reactions between the electrolyte and electrode during cycling. The optimal NNMO@PPy-9 with 9 wt% PPy delivers a high capacity of 127.4 mAh/g at the current density at 150 mA g −1 , an excellent cyclic stability with high capacity retention of 80.5 % after 300 cycles, and enhanced rate performance (169.3 mAh/g at 15 mA g −1 while 89.8 mAh/g at 600 mA g −1 ). Furthermore, hard carbon (−)//NNMO@PPy-9 (+) full cell delivers a high energy density of 305.1 Wh kg −1 and superior cycling stability with 88.2 % capacity retention after 150 cycles. In-situ X-ray diffraction experiment and electrochemical characterization verify the highly reversible structure evolution and robust P 2-type phase structure of NNMO@PPy-9 for fast and stable Na + diffusion. This effective strategy of using conductive PPy as a coating layer may provide a new insight to modify NNMO surface, improving the cycling stability and rate capability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3709-3722
·
IF 4.5
Mu Wenxiao,Liang Weidong,Wang Yanqing,Sun Hanxue,Zhu Zhaoqi,Li Jiyan
Improving solar energy conversion efficiency and salt resistance is particularly important for the practical application of green and sustainable solar steam generation technology. In this work, an interfacial evaporation polypyrrole-coated film was fabricated by the mixed-dimensional clay consisting of 1D palygorskite (Pal), 2D montmorillonite (Mt) and mica, etc., that was intercalated using polyaniline (PANI) and then introduced polyvinyl pyrrolidone (PVP) as pore-forming agent and polyvinylidene fluoride (PVDF) as a base film. The prepared film could efficiently convert light energy to heat under solar irradiation with excellent properties of self-desalination and photothermal conversion efficiency as well as superhydrophilicity and low thermal conductivity. The photothermal conversion efficiency achieved up to 93.6% under the simulated sunlight of 1 kW m −2 . The evaporation rate in 15% NaCl brine differed very little from that in pure water, and 0.2 g of NaCl placed on the film would be eliminated in short time at room temperature, which demonstrated that the film had salt resistance and self-cleaning capability. In addition, the resulting film had low thermal conductivity (0.09994 W m −1 K −1 ) and good mechanical properties (tensile strength of 1.1 MPa) and exhibited superhydrophilicity (water contact angle ~ 0°) which could transport water molecules rapidly.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 27
·275404
·
IF 3.551
Xinzhe Yang,Xiaofei Liu,Tingting Qin,Xiaoyu Zhang,Wei Zhang,Weitao Zheng
Although there are numerous virtues for lithium sulfur batteries, the notorious shuttle effect and insulated nature are impeding their practical application. To address these issues, here we report the design and synthesis of polypyrrole coated sulfur and cobalt co-doped carbon nanocages (PSCC). It demonstrates that both the performance and stability of the PSCC assisted Li-S batteries are improved. The hollow structure of PSCC bypassed the structural collapse effectively caused by volume expansion of sulfur during the reaction and physically suppressed shuttle effect of the intermediate product polysulfide lithium (LiPSs). Also, LiPSs was also trapped to inhibit the shuttle effect due to the strong adsorption of LiPSs via PSCC. In addition, PSCC can also provide an outstanding electronic conductivity, which will facilitate the next-step reaction of the absorbed LiPSs and enhance electrochemical reaction kinetics. Thus, the excellent rate performance was obtained with high specific discharge capacities of 1300 mAh g−1 at 0.1 C and 1000 mAh g−1 at 0.5 C. Such packaged high-performance positions our design for the ideal electrochemical energy storage devices.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2018
·Vol. 26
·期 2
·1169-1181
·
IF 3.809
Zhang Chuanjie,Chen Zeqi,Rao Weida,Fan Lingling,Xia Zhigang,Xu Weilin,Xu Jie
Abstract Yarn supercapacitors (YSCs) are attracting considerable interest for wearable electronics and intelligent textiles due to their high flexibility and weavability. In the present study, stainless steel/cotton blended yarns were used as supports and current collectors to produce polypyrrole-coated yarn electrodes. The as-made YSC exhibited a high areal specific capacitance of 344 mF cm −2 at a current density of 0.6 mA cm −2 and good cycling stability (almost 93% capacitance retention over 1000 cycles). Moreover, the YSC could be knitted into other fabrics without damaging its original structure and electrochemical performance owing to its superior flexibility, indicating that it can meet the requirements of energy-storage devices for wearable electronics. Graphical abstract
研究领域:
材料科学
·
能源存储
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Peng He,Maolin Zhang,Saijing Wang,Limin Yuwen,Yuan Wang,Yangxi Yan,Dongyan Zhang,Xiaofei Sun
Co-free and Ni-rich LiNi 0.95 Mn 0.05 O 2 (NM95) cathodes are expected to be widely employed in power batteries due to their high capacity and low cost. However, the loss of Co and increase in Ni compromise cyclic stability and high-rate performance. Herein, PPy coating layer with excellent flexibility and conductivity is introduced on NM95 surface to enhance the structural stability and charge transfer properties. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry are utilized to elaborate on positive influence of PPy on electrochemical performance. PPy coating alleviates volumetric changes of cathode caused by charge/discharge process, suppressing mechanical fragmentation. Moreover, PPy provides protective layer to suppress side reactions and isolate the corrosion of electrolytes. Besides, PPy is widely recognized excellent electronic conductor that can promote electronic conduction. It is revealed that PPy-coated NM95 cathode exhibits excellent capacity retention of 90.1 % (4.3 V) and 84.4 % (4.5 V) after 100 charge/discharge cycles at 1 C. Moreover, capacity retention is 91.1 % after 100 cycles and initial capacity is as high as 153.4 mAh/g at 5 C. These results indicate that flexible and electronically conductive coating is effective strategy to enhance cyclic stability of NM95 cathodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Renjie Yang,Tingting Yu,Xiangyu Zhao
Iron oxychloride has been regarded as a promising cathode material for chloride ion batteries (CIBs). However, it suffers a severe capacity decay during repeated conversion reactions based on chloride ion transfer. Herein, we report an iron oxychloride composite material with a polypyrrole coating (FeOCl@PPy), which is prepared by a facile and efficient chemical vapor phase polymerization method , as cathode for CIB. The as-prepared FeOCl@PPy cathode material with drastically enhanced charge transfer and chloride ion diffusion shows a stable core-shell structure, which can prevent the FeOCl particles from pulverization during cycling. As a result, a maximum capacity of 187 mA h g −1 and significantly improved cycling stability with 82.9% capacity retention after 30 cycles are obtained. In contrast, the neat FeOCl cathode fades fast and shows only 13.2% capacity retention.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
功能材料
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·234
·
IF 4.6
Fei Tang,Wei Jiang,Jingjing Xie,Deyang Zhao,Yanfeng Meng,Zhenglong Yang,Zhiqiang Lv,Yanbin Xu,Wenjuan Sun,Ziqiao Jiang
Heterostructured materials show great potential to enhance the specific capacity, rate performance and cycling lifespan of lithium-ion batteries owing to their unique interfaces, robust architectures, and synergistic effects. Herein, a polypyrrole (PPy)-coated nanotube-like Mo3S4/CoMo2S4heterostructure is prepared by the hydrothermal and subsequent in situ polymerization methods. The well-designed nanotube-like structure is beneficial to relieve the serious volume changes and facilitate the infiltration of electrolytes during the charge/discharge process. The Mo3S4/CoMo2S4heterostructure could effectively enhance the electrical conductivity and Li+transport kinetics owing to the refined energy band structure and the internal electric field at the heterostructure interface. Moreover, the conductive PPy-coated layer could inhibit the obvious volume expansion like a firm armor and further avoid the pulverization of the active material and aggregation of generated products. Benefiting from the synergistic effects of the well-designed heterostructure and PPy-coated nanotube-like architecture, the prepared Mo3S4/CoMo2S4heterostructure delivers high reversible capacity (1251.3 mAh g−1at 300 mA g−1), superior rate performance (340.3 mAh g−1at 5.0 A g−1) and excellent cycling lifespan (744.1 mAh g−1after 600 cycles at a current density of 2.0 A g−1). Such a design concept provides a promising strategy towards heterostructure materials to enhance their lithium storage performances and boost their practical applications.
研究领域:
材料科学
·
能量存储
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Hao Yu,Peng Zhang,Dongbao Song,Hao Chen,Peng Huang,Srđan D. Rončević,Hongwen Sun
The global concern of per- and polyfluoroalkyl substance (PFAS) contamination has gradually shifted from long- to ultrashort- and short-chain PFAS, but the widely used pyrogenic carbons (PCs) are almost ineffective at removing such hydrophilic pollutants. Herein, a polypyrrole (PPy) nanostructured coating strategy was proposed to modify PCs (PPy@P-BC) for rapid and efficient removal of ultrashort- and short-chain PFAS from water. Static batch tests revealed that the sorption rate constant and sorption capacity of PFAS (C2–C6) on PPy@P-BC are at least 38 times and 5 times greater than those on undecorated PCs and benchmark materials of granular activated carbon, respectively, and their sorption equilibrium time is within 300 s. The outstanding sorption performance of PPy@P-BC is maintained in dynamic column tests (>3120 bed volumes) and different types of real water contaminated by 36 PFAS, including 11 previously identified emerging PFAS (removal >95.3%). PPy@P-BC also exhibited excellent regeneration and reusability. The following dual-drive mechanisms for PFAS removal were identified based on experimental results and density functional theory (DFT) calculations: (i) electrostatic attraction between amino functional groups (especially −NH•+−) on the nanostructured PPy coating and anionic PFAS and (ii) pore filling facilitated by the well-preserved porous structure via construction of the nanostructured coating. Overall, these results provide a promising solution to address the ultrashort- and short-chain PFAS crisis.
研究领域:
环境科学
·
水处理技术
·
纳米技术
·
吸附过程
·
化学工程
·
材料科学
·
污染控制
·
环境化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）