JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 4
·997-1006
·
IF 2.646
Song Haishen,Yuan Hailiang,Chen Hezhang,Tang Anping,Xu Guorong,Liu Lihua,Zhang Zhian,Kuang Qiujuan
The commercial application of lithium-sulfur (Li-S) battery is hampered by the insulating characteristic and dissolution problem of sulfur and lithium polysulfides. Herein, a mesoporous TiO 2 @PPy material has been fabricated to act as the chemical immobilizer for sulfur species in Li-S battery. In the structure, PPy layer is covered uniformly on surface of the mesoprous TiO 2 , forming a core-shell structure. The well-developed mesopores act as the reservoir for sulfur, while the PPy layer improves the conductivity of material and further prevents diffusion of soluble polysulfides. The synthesized TiO 2 /S@PPy composite delivers an improved rate capability and cycling stability, with an initial discharge specific capacity of 1013.7 mAh g −1 at 0.1 C. In addition, the composite reserves a high capacity of 567.0 mAh g −1 after 300 cycles at 0.5 C, with a decreasing rate of 0.103% per cycle.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2023
·
IF 0
Fei Wang,Yuliang Zhang,Bochen Jiang,Mengyang Cong,Ting Shu,Ying Qin,Yanhua Lei,Lihua Dong
The issue of anti-icing and deicing in the low-temperature and high-humidity environment of polar regions has long troubled researchers. The problem cannot be solved perfectly by superhydrophobic coatings alone, and multifunctional composite coatings as well have become a research hotspot. First, hexagonal boron nitride nanosheets were functionalized with polypyrrole (PPy), and then hydrophobic modification was completed by grafting perfluorodecyltriethoxysilane (FAS) to obtain fluorine-modified polypyrrole-functionalized boron nitride (F-BN@PPy). Finally, a photothermal superhydrophobic coating was successfully prepared by using silicone resin as a binder. The coating exhibited excellent photothermal properties, reaching 80 °C in just 3 min under 1 sun irradiation at 25 °C. This can be attributed to the high photothermal conversion efficiency of PPy and the nanostructure of the coating surface, which enhances sunlight utilization. The coating also demonstrated superior hydrophobic properties, reflected by a contact angle of 162° and a sliding angle of 1°, due to the hydrolysis of tetraethyl orthosilicate forming a rough micronanosilica shell and the grafting of the low surface energy FAS. In addition, the performance of the coating maintained good hydrophobic properties by sandpaper abrasion, falling sand impact, bending experiments, or immersion in strong acids and bases for 7 days. This shows that the coating has good mechanical properties and chemical durability. Compared to tinplate, the coating successfully delayed the complete freezing of droplets on its surface at −20 °C by 10 min. On a cooling platform at −40 °C, the F-BN@PPy coating with 1 sun light reached 5.7 °C in only 90 s. The F-BN@PPy photothermal superhydrophobic coating provides an excellent anti-icing/deicing solution for extreme environments.
研究领域:
材料科学
·
表面工程
·
纳米技术
✓ 已验证
DOI
Journal of Energy Chemistry
·
2022
·
IF 13.599
Yaqin Qi,Chao Shen,Qian Hou,Zengying Ren,Ting Jin,Keyu Xie
The gallium-based liquid metal as one of the self-healing materials has gained wide attention, especially in the energy storage system. However, volume expansion with the “liquid–solid-liquid” transformation process still leads to un-controlled electrode failure, which stimulates the irreversibility of liquid metal and hinders their self-healing effect as the anode for lithium-ion batteries. Herein, the polypyrrole (PPy) with highly conductive and adhesive features is first introduced to fasten the liquid metal nanoparticles (gallium-tin alloy, EGaSn) in the integrated electrode and applied as the anode for lithium-ion batteries. A tightly PPy wrapped EGaSn nanoparticles structure is formed during the in - situ polymerization synthesis process, which effectively avoids the detachment of solid alloyed products. Based on the features of PPy, polyacrylic acid is added to facilitate strengthening the integrity of the electrode by constructing the hydrogen bond. The “dual-insurance” design endows the EGaSn to exhibit superior electrochemical kinetics and an astonishing self-healing effect. As a result, the customized anode displays superior cycling stability (499.8 mAh g −1 after 500 cycles at 1.0 A g −1 ) and rate capability (350 mAh g −1 at 2.0 A g −1 ). This work enriches the electrode engineering technology of liquid metal nanoparticles and opens up a new way to customize the self-healing anode for lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 13
·10298-10309
·
IF 4.6
Wenjuan Zhang,Xiangyue Yang,Youliang Wang,Yaxian Wang,Xuyang Wu,Yongqian Shen
As wireless communication technologies and electronic devices continue to advance quickly, electromagnetic waves (EMWs) have a serious impact on equipment interference and human health. The development of new materials for EMW absorption and shielding is crucial to mitigate electromagnetic (EM) interference. In this study, a unique strategy was implemented for developing a mesoporous polypyrrole/MXene (mPM) composite. The mPM composite was prepared by a molecular synergistic self-assembly method using spherical block copolymer micelles as templating agents to regulate mesopores. The effects of the polypyrrole/MXene ratio and pore size on the EMWs absorption performance of composites were systematically investigated. The mPM composite formed by MXene and polypyrrole exhibits a well-developed porous structure and conductive network, significantly enhancing dielectric loss. The rich mesoporous structures and the multi-layer heterogeneous interfaces can improve the interface polarization, realize multiple reflections, and enhance the EMWs absorption performance of the mPM. The mPM-1 composite, prepared using the PS100-b-PEO114 template, achieved a reflection loss (RL) of −67.82 dB at an MXene to polypyrrole ratio of 1 with a matching thickness of 1.37 mm. Its effective absorption bandwidth (EBW) was 3.68 GHz (ranging from 14.16 to 17.84 GHz) with a matching thickness of 1.25 mm. It is a reliable way to develop absorbing materials with light, thin, large EBW and high-quality EMWs absorption performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Gu Ziyu,Zou Xunliang,Zhang Wenbo,Xiong Yunfeng,Zhai Zhuangzhuang,Zhou Kui,Ai Fanrong,Li Ke
The objective of this research is to address the issue of excessive degradation in magnesium alloys and to achieve controlled degradation of such alloys. To fulfill this objective, montmorillonite/polypyrrole-polycaprolactone (MMT/PPy-PCL) composite coatings were fabricated on the surface of AZ31B magnesium alloy through a two-step method. The outcomes of the study revealed that the PCL-PPy composite coating, developed on the foundation of MMT pre-coating, exhibited a protection efficiency of over 95% for the magnesium alloy substrate, significantly enhancing its corrosion resistance. The incorporation of PPy particles in the composite coating facilitated cell adhesion and proliferation, thereby improving the material’s biocompatibility. Furthermore, the introduction of PPy augmented the number of surface pores in the initially dense PCL composite coating by 0.9-2.5%. Adjusting the PPy particle content in the composite coating proved beneficial in regulating the coating’s porosity, thereby aiding in controlling the degradation rate of the magnesium alloy matrix. Additionally, the cell viability of the MMT/PPy-PCL composite coating consistently exceeded 90%, indicating its favorable impact on the biocompatibility of the magnesium alloy. AZ31B magnesium samples coated with the MMT/PPy-PCL composite coating demonstrated exceptional performance in terms of corrosion resistance, mechanical properties, and biocompatibility. This suggests that it holds great promise as a versatile medical implant material, offering an optimal combination of characteristics for various biomedical applications.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mingzhe Chen,Sailing Zhu,Shaowei Wang,Weisheng Yang,Mingqiang Ye,Yihui Zhou,Shaohua Jiang,Shuijian He,Jingquan Han
Lignin-removed cellulose skeleton (CS) with porous structure and abundant oxygen-containing groups synergized with functional MXene is a promising strategy for constructing high-performance energy storage electrodes. However, the intrinsic instability of MXene under environmental conditions poses a significant challenge to the advancement of MXene-CS (MCS) electrodes. Herein, Polypyrrole@MXene-CS (PPy@MXene-CS, PMCS) electrodes with excellent antioxidant and electrochemical performances are developed by constructing PPy-encapsulated MXene on CS through impregnation and in-situ loading. The impregnated MXene is tightly bound to CS through hydrogen bonding interactions to form the homogeneous MCS conductive network. The in-situ encapsulated PPy not only strengthens the oxidation resistance of MXene, but also imparts the PMCS additional pseudocapacitance. Benefiting from the natural CS pore structure and the synergistic electrochemical energy storage materials, the PMCS electrode demonstrates an area capacitance of up to 2622 mF cm −2 (at 3 mA cm −2 current density) and without significant degradation after two months storage. The assembled quasi-solid-state symmetric supercapacitor exhibits the satisfactory area capacitance (2144.5 mF cm −2 at 3 mA cm −2 ), energy density (21.6 μWh cm −2 ) and cycling capability (93.2 % capacitance retention after 6000 cycles). This work presents a breakthrough strategy for fabricating high-performance and oxidation-resistant CS electrodes, paving the way for advanced energy storage technologies.
研究领域:
材料科学
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能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Weijie Lin,Han Han,Xilai Yan,Jie Xie,Hongshen He,Shibo Han,Dengwen Ning,Ajoy Kanti Mondal,Shuai Wu,Fang Huang
The preparation of natural polymer-based highly conductive hydrogels with reliable durability for applications in supercapacitors (SCs) is still challenging. Herein, a facile method to prepare alkaline lignin (AL)-based polypyrrole (PPy)-rich, high-conductive PPy@AL/PEGDGE gel was reported, where AL was used as a dopant , polyethylene glycol diglycidyl ether (PEGDGE) as a cross-linking agent, and PPy as a conducting polymer . The PPy@AL/PEGDGE gel electrode materials with hollow structures were prepared by electrochemical deposition and chemical etching method and then assembled into sandwich-shaped SCs. Cyclic voltammetry (CV), galvanotactic charge discharge (GCD), electrochemical impedance spectroscopy (EIS) and cycling stability tests of the PPy@AL/PEGDGE SCs were performed. The results demonstrated that the SCs can achieve a conductivity of 25.9 S·m −1 and a specific capacitance of 175 F·g −1 , which was 127.4 % higher compared to pure PPy (77 F·g −1 ) electrode. The highest energy density and power density for the SCs were obtained at 23.06 Wh·kg −1 and 5376 W·kg −1 , respectively. In addition, the cycling performance was also higher than that of pure PPy assembled SCs (50 %), and the capacitance retention rate can reach 72.3 % after 1000 cycles. The electrode materials are expected to be used as sensor and SCs devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Cuiping Bu,Xingzhen Zhang,Aqiang Chu,Xue Cao,Shenxiang Zhang,Jian Jin
Solar-driven evaporation has received widespread attention in obtaining fresh water from seawater and wastewater. However, a major challenge in this process is maintaining a high evaporation rate, while preventing salt accumulation. Herein, a hydrophilic tannic acid (TA)-induced polypyrrole (PPy) coating layer with a controllable thickness was developed on nonwoven fabric using a layer-by-layer (LbL) assembly technique. TA along with pyrrole (Py) molecules was first deposited on the substrate surface through noncovalent interactions. Then, Fe3+ was bonded with TA through metal coordination, acting as an oxidant for the polymerization of Py molecules. After the LbL cycle process, a uniform TA/PPy coating was formed on the fabric surface, exhibiting excellent hydrophilicity and solar absorption performance. The roof-structure evaporation system was then built by placing the fabric on the roof-structure support, ensuring that seawater flows from top to bottom. This structure helps to remove the concentrated brine from the fabric at the bottom of the evaporator, thereby preventing the accumulation of salt crystals. This design results in a high evaporation rate of 2.67 kg m–2 h–1 and a comparable evaporation efficiency of 89.6% under 1 sun irradiation. It is possible to achieve rapid and continuous evaporation even with high-concentration saline water containing 21% NaCl. Therefore, this study provides a simple construction of TA/PPy coatings suitable for different substrates and demonstrates the design of a roof-structure evaporation system for efficiently producing fresh water from seawater and high-salinity wastewater.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenxuan Xie,Mingzhe Li,Ziyu Ling,Xiaofen Wang,Yuzhen Lv,Kepi Chen
Highly efficient and stable electrocatalysts toward hydrogen evolution reaction (HER) under large current density are essential for alkaline water splitting. Herein, an active and durable CoMoO 4 -based HER electrocatalyst is developed, with a coupling of surface phosphorization and polypyrrole (PPy) modification to accelerate water dissociation and prevent alkaline corrosion during HER process, ensuring great catalyst stability. The prepared PPy-CoMoO 4 /P@NF catalyst achieves perfect HER activity with only 242.1 mV overpotential at the industrial current density of 1000 mA·cm −2 in 1.0 M KOH as well as a low Tafel slope of 39.0 mV dec −1 . Moreover, PPy modification greatly inhibits the alkaline corrosion and the catalyst exhibits stable operation for 100 h at 1000 mA·cm −2 with a conservation rate of 98.5 %. Electrochemical tests and theoretical calculations reveal that the multiple interfaces formed by CoMoO 4 /CoP/PPy significantly reduce the energy barrier of hydrolysis and improve the interfacial adsorption of H ads . Meanwhile, the surface phosphating changes the Gibbs free energy of rate-determining step (RDS) from −0.54 to −0.29 eV, optimizing the energy barriers for hydrogen adsorption-desorption. Remarkably, an electrolyzer with PPy-CoMoO 4 /P @NF as cathode catalyst only needs a cell voltage of 1.92 V at 1000 mA cm −2 for overall water splitting. This study provides an effective way to develop highly efficient and stable HER catalysts toward industrial water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 13
·1940
·
IF 4.7
Kuo Zhao,Yunbo Shi,Mingrui Cui,Bolun Tang,Canda Zheng,Qinglong Chen,Yuhan Hu
High sensitivity and selectivity and short response and recovery times are important for practical conductive polymer gas sensors. However, poor stability, poor selectivity, and long response times significantly limit the applicability of single-phase conducting polymers, such as polypyrrole (PPy). In this study, PPy/MoS2composite films were prepared via chemical polymerization and mechanical blending, and flexible thin-film resistive NO2sensors consisting of copper heating, fluorene polyester insulating, and PPy/MoS2sensing layers with a silver fork finger electrode were fabricated on a flexible polyimide substrate using a flexible electronic printer. The PPy/MoS2composite films were characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. A home-built gas sensing test platform was built to determine the resistance changes in the composite thin-film sensor with temperature and gas concentration. The PPy/MoS2sensor exhibited better sensitivity, selectivity, and stability than a pure PPy sensor. Its response to 50 ppm NO2was 38% at 150 °C, i.e., 26% higher than that of the pure PPy sensor, and its selectivity and stability were also higher. The greater sensitivity was attributed to p–n heterojunction formation after MoS2doping and more gas adsorption sites. Thus, PPy/MoS2composite film sensors have good application prospects.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Weijia Gong,Langming Bai,Heng Liang
Electrification can enhance the antifouling performance of ultrafiltration membranes and improve the sustainability of membrane technologies. The design of high-performance conductive membrane materials remains one of the core technologies in electro-assisted ultrafiltration. Here, conductive PVDF/PEDOT:PSS composite membranes were prepared via in situ chemical oxidation polymerization on a PVDF surface. The PVDF/PEDOT:PSS membranes were subsequently used for electro-filtration to study the effect of the applied potential on humic acid fouling. When a voltage of 3 V was applied, the PVDF/PEDOT:PSS 20 membrane was continuously polluted for 5 cycles. The results showed that after simple hydraulic cleaning, the membrane flux recovery rate reached 91 %. Compared with that of the PVDF membrane, the irreversible fouling of the PVDF/PEDOT:PSS 20 membrane decreased by 65 %. The modified Poisson Boltzmann equation indicates that applying cathodic potential on the surface of PEDOT:PSS conductive layer increases the cumulative concentration of counter ions on the membrane surface and the thickness of the charged layer, thereby promoting the migration of peak forces on the membrane surface to the bulk solution, changing the fouling behaviour of HA from cake filtration to standard blocking.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Dan Wang,Zhen Hou,Fengling Wang,Hui Zhang,Jiwei Jiang,Bin Dong
Light-driven rotary actuators have undergone tremendous progress in recent years and show great potential for different applications ranging from sensors, soft robots to micro–nano intelligent systems. However, most photoactuators with rotary motions have a low rotational speed due to their low responsive speed and small driving force, which hinder both their fundamental and practical research. In this paper, we report a fast rotation of a soft actuator in response to light, which harnesses the synergistic interactions between two binary responsive components, i.e. water responsive agar and photothermally responsive polypyrrole, leading to a structural protrusion at the irradiation center that provides a jet-propulsion when the gas expands to the edge of the film. Interestingly, the motion behavior of the photoactuator film could be well controlled from the in-place rotation to horizontal motion as a result of the fast rotation with a speed as high as 5200 rpm. The current study indicates a fast rotation could be realized by the simple design and fabrication, which may not only stimulate the exploration of new motion behaviors for photothermal actuators but also open up new opportunities for their practical applications.
研究领域:
材料科学
·
智能系统
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）