ELECTROCHIMICA ACTA
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2021
·
IF 6.901
Xiaojie Zhang,Jinchen Zhao,Yan Zhao,Zhumabay Bakenov,Yongguang Zhang
The lithium sulfur (Li-S) battery holds great promise in next-generation energy storage technologies. However, the lithium polysulfide (LiPS) shuttle and slow reaction kinetics still limit its commercial development. Here, a squaraine-based porous organic framework (POF) with sulfophilic and lithiophilic moieties was developed as the separator modifications for the first time. The POF coating layer on the common separator builds a strong barrier against the LiPS shuttling, resulting in a robust inhibition on the shuttle effect as well as boosted sulfur reaction kinetics. Therefore, the POF-PP separator demonstrates stable cycling performance with a low capacity attenuation rate of 0.04% over 500 cycles and high areal discharge capacity of 4.67 mAh cm −2 with a sulfur loading of 5 mg cm −2 , which show high potential for high loading and practical Li-S battery.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiangfeng Shu,Sheng Wang,Wenjie Wu,Sifan He,Hengdong Ren,Yenan Song,Zhenjie Zhao
Polyaniline (PANI)-based networks combined with Fe 3 O 4 hollow spheres and carbon balls (FCP) for improved electromagnetic wave (EMW) absorption were investigated using an easy-to-industrialize solvothermal and physical method. Hollow structure Fe 3 O 4 spheres with a lower density than that of the common solid sphere were prepared. As a thin and light magnetic material, Fe 3 O 4 hollow spheres generate magnetic loss, carbon balls and PANI networks generate dielectric loss. The magnetic and conductive parts play appropriate roles in achieving complementarity in the EMW absorption. The relatively high specific surface area introduced by PANI networks promotes interfacial polarization and further supports dielectric loss. In conclusion, the above reasons provide multiple attenuation mechanisms. Samples FCP1 (−65.109 dB, at 12.800 GHz, 1.966 mm, from 5.6 to 18.0 GHz) and FCP2 (−61.033 dB, at 8.480 GHz, 3.328 mm, from 4.3 to 18.0 GHz) demonstrated a wide bandwidth, a small thickness, a minimum reflection loss (R L ), and a low loading ratio (25%) in paraffin-based composites. Specifically, their loading ration of 25% is much lower than the loading ratio of conventional materials (usually 50% and above). In addition, the bandwidth is excessively wide, above 12 GHz, possessing good absorption performance in continuous intervals with different thicknesses. Such excellent characteristics have rarely been reported in literature.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2021
·
IF 1.134
Guang-Lei CHU,Jing-Cheng HUANG,Jia-Qi YIN,Ye-Min GUO,Ming LI,Yan-Yan ZHANG,Xia SUN
In this paper, a new type of copper nanoparticles (Cu NPs) coated with antioxidant film was prepared, and a low-cost nitrite electrochemical sensor was constructed. Low-cost carboxymethylcellulose sodium (CMC-Na) and aniline were used as raw materials, and CMC-Na was used as the polymerization template of aniline to successfully prepare polyaniline-carboxymethyl cellulose nanorods (PANI-CMC). In order to slow down the oxidation rate of copper nanoparticles, CMC@copper nanoparticles (CMC@Cu NPs) containing 2.5 nm antioxidation film were prepared in consideration of the high water solubility, good chemical stability and strong film-forming ability of CMC. It turns out that the prepared PANI-CMC@Cu NPs/GCE had a good current response to nitrite with the linear detection ranges of 3-15,000 μM and 15,000-29,000 μM, and the limit of detection (LOD) of 0.170 μM (S/N= 3). The sensor based on the PANI-CMC@Cu NPs performed good stability and retained 91.3% of the initial sensitivity after 25 days. Meanwhile, the preparation cost of the sensor was extremely low owing to the low price of raw materials in the experiment process, which made mass production possible.
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ACS Applied Electronic Materials
·
2021
·
IF 3.314
Nan Lv,Wenbo Jiang,Kongsen Hu,Zhiwei Lyu
Fabrication of flexible piezoelectric sensing nanomaterials is essential for the development of wearable and microscopic electronic devices. However, existing piezoelectric sensing materials usually rely on the secondary synthesis process to accomplish the preparation of conductive layer electrodes. Here, we report a one-step strategy for synchronous construction of piezoelectric elements and nanoresistance networks via fabricating flexible [polyacrylonitrile/BaTiO3]@[polyaniline/polyvinyl pyrrolidone] core–shell nanofibers (NFs, denoted [PAN/BTO]@[PANI/PVP]) by coaxial electrospinning. This is the first time to collect and output voltage signals generated by piezoelectric materials through nanoresistance networks based on the Wheatstone bridge principle. As a result, flexible [PAN/BTO]@[PANI/PVP] core–shell NFs as an integrated sensing system without layer electrodes can directly result in voltage signals under repeating press–release motions. The potential of a flexible core–shell [PAN/BTO]@[PANI/PVP] integrated nanofiber membrane (INFM) for pressure sensing is properly explored and evaluated. The integration of piezoelectric elements and nanoresistance networks enables the INFM to perceive pressures with high sensitivity (728 mV N–1) down to approximately 0.05 N and a quick response (26 ms). Overall, our study demonstrates a promising strategy to fabricate nanoscale, highly sensitive, and low-cost integrated sensing materials, which have potential applications in micro-/nanoscale sensors and wearable electronics.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Kaili Gong,Lian Yin,Keqing Zhou,Xiaodong Qian,Congling Shi,Zhou Gui,Bin Yu,Lijun Qian
Interfacial interaction played a crucial role in the performance of nanofiller-reinforced polymer composites . Here, an interface-engineered strategy was adopted to establish the strong interfacial linkage between phosphorus-doped cerium oxide (P-CeO 2 ) and EP via introducing polyaniline (PANI) coating, and then endow EP composites with superb fire resistance. The as-prepared P-CeO 2 @PANI nanohybrids were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TGA) and scanning electron microscopy (SEM), respectively. Subsequently, P-CeO 2 @PANI nanohybrids were incorporated into EP matrix to probe their influences on the thermal properties, flame retardancy and mechanical properties of EP composites. The coated PANI could strengthen the interfacial adhesion between P-CeO 2 and EP by covalent bonding, achieving a good dispersion state in EP matrix. Moreover, the introduction of P-CeO 2 @PANI nanohybrids led to the decreasing peak heat release rate (PHRR), total heat release (THR), peak CO production rate (PCO) and peak CO 2 production rate (PCO 2 ), with the reduction of 21%, 26%, 40% and 31%, respectively. Additionally, the introduction of P-CeO 2 @PANI enhanced cross-linking density and dynamic mechanical properties of EP composites. In conclusion, the reinforced interfacial interactions promoted the dispersion of interface-engineered nanofiller, which together with the lamellar barrier effect and catalytic effect of P-CeO 2 @PANI hybrids, contributed to the enhancements of the thermal properties, fire safety and mechanical properties of EP composites.
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ACS Applied Nano Materials
·
2021
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IF 5.097
Fangwei Qi,Xiuwen Gao,Shuping Peng,Wenjing Yang,Guowen Qian,Sheng Yang,Cijun Shuai
Piezoelectric polyvinylidene fluoride (PVDF) provided an opportunity for non-invasive in situ electrical stimulation of cell behavior, yet its electroactive β phase was difficult to obtain due to its instability in the molten state. Herein, polyaniline (PANI) protrusions were in situ oxidation-polymerized on molybdenum disulfide (MoS2) nanosheets (PANI-MoS2). Then, PANI-MoS2 was introduced into laser additive-manufactured PVDF scaffolds. On the one hand, PANI protrusions produced steric hindrance between adjacent MoS2 nanosheets and inhibited the stacking and aggregating of MoS2. On the other hand, PANI-MoS2 could serve as a platform to achieve interfacial polarization locking. Specifically, Mo–S dipoles in MoS2 and π electron clouds over the N atom in PANI locked −CH2 dipoles in PVDF through electrostatic and hydrogen bond interactions, respectively, which forced −CH2 to align perpendicularly to the basal plane of MoS2 and bialy to one side of the PVDF main chain, thereby forming a full-reverse planar zigzag configuration of the polarized β phase and maintaining its stable existence. The results demonstrated that the β phase of the scaffolds was significantly increased from 43 to 90%, which resulted in an enhanced electrical output performance. The improved electrical output greatly promoted osteoblast-like cell proliferation and differentiation. Furthermore, owing to the pulling-out effect of MoS2 and improved interfacial stress transfer between MoS2 and the polymer matrix, the mechanical properties of scaffolds were also enhanced. These findings suggested that the piezoelectric scaffolds had great potential in bone tissue engineering.
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NANOTECHNOLOGY
·
2021
·Vol. 33
·期 4
·045405
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IF 3.874
Hui Liu,You Tao,Huijuan Sun,Tian-Xiong Wang,Zhisheng Peng,Jiyou Jin,Zhongpu Wang,Kang Peng,Haonan Wei,Yong Jun Li,Bao-Hang Han,Lianfeng Sun
Polyaniline, as a kind of conductive polymer with commercial application prospects, is still under researches in its synthesis and applications. In this work, polyaniline was fabricated on flexible substrates including carbon cloths and polyethylene naphthalate by in situ electropolymerization method. The synthesized flexible electrodes were characterized by scanning electron microscopy, High resolution transmission electron microscope, atomic force microscope, Fourier transform infrared, x-ray diffraction, and x-ray photoelectron spectroscopy. Owing to the conductivity and the reversible redox property, the polyaniline/carbon cloth electrodes show excellent properties such as decent supercapacitor performance and good detection capability toward ascorbic acid. As supercapacitors, the electrodes exhibit a specific capacitance as high as 776 F g–1 at a current density of 1 A g–1 and a long cycle life of 20 000 times in the three-electrode system. As ascorbic acid sensors, the flexible electrodes demonstrate stable response to ascorbic acid in the range of 1–3000 μM with an outstanding sensitivity (4228 μA mM–1 cm–2), low detection limit (1 μM), and a fast response time. This work holds promise for high-performance and low-cost flexible electrodes for both supercapacitors and non-enzymatic ascorbic acid sensors, and may inspire inventions of self-powered electrochemical sensor.
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PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 2
·953-966
·
IF 5.044
Li Shuai,Yang Xiaochun,He Yingying,Wang Yanan,Liao Daogui,Chen Yunhua,Xie Huihong,Liu Hongxia,Zhou Li
An integrated aero-cryogel (A-CG) monolith with hierarchical porous structure was developed by inter-crosslinking of cellulose nanofiber/polylactic acid nanocomposite aerogel and carboxymethyl cellulose (CMC) cryogel (CG). The photothermal nanoparticles-enriched CMC CG phase served as a sunlight absorbing layer, exhibiting a broadband sunlight absorption of 98%. Due to the large amount of weakly bounded water molecules, the swelled CMC CG possessed a lower evaporation enthalpy than that of pure water, which facilitates water evaporation, while the nanocomposite aerogel phase acted as an excellent thermal insulator and afforded highly efficient water transport channels. Thus, the developed A-CG monolith supported by insulated polystyrene foam to protrude above the water surface, could reach an evaporation rate of 2.16 kg m −2 h −1 under an irradiation of 1 Sun (100 mw/cm 2 ) with an efficiency of 93.6%. More remarkably, when the wind energy was imparted, an evaporation rate of 5.67 kg m −2 h −1 was achieved at a wind speed of 3 m s −1 . The high-efficiency purification outcomes of various raw water demonstrate the great potentials of A-CG material in solar vapor generation. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zihua Wang,Chijia Wang,Weihao Fan,Shuyi Liu,Kaka Li,Hongxin Luo,Shupei Liu,Huaiyuan Wang
A robust bifunctional platform (FA-PANI-Fe-F) with both shielding performance and corrosion inhibition activity was prepared and observed for its structure and morphology. During the corrosion test , Fe 2+ /Fe 3+ and perfluorinated groups effectively strengthened the shielding performance and corrosion inhibition activity of the coating. The results show that the perfluorinated group not only improved the hydrophobic performance of the functional filler but also provided effective inhibition against corrosion for the anode area. In addition, Fe 2+ /Fe 3+ resulted in the functional filler exhibiting anodic protection and cathodic inhibition properties, thereby forming a dense metal passivation film between the coating and the substrate interface. After the EIS test, the |Z| 0.01 Hz value of FPF-Fe 10% C still reached 7.91 × 10 8 Ω·cm 2 . Additionally, the FPF-Fe 10% C showed a lower cathodic corrosion trend in the SVET test, which indicated that Fe 2+ /Fe 3+ effectively inhibited the corrosion process in the cathode region. This study is expected to open new insights into the anti-corrosion inhibition process between the interior of the coating and the metal substrate, and prepare a robust bifunctional filler platform with long-term corrosion resistance .
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jinming Ma,Huizhen Deng,Zhe Zhang,Lexin Zhang,Zhihui Qin,Yaru Zhang,Lili Gao,Tifeng Jiao
In this study, a series of Ag 3 PO 4 /PPy/PANI ternary composite catalysts were fabricated by adjusting the mixed solution of pyrrole and aniline with different volume ratios of 4:1, 3:2, 1:1, 2:3, and 1:4, and combining with the in-situ synthesis method. The synthesized Ag 3 PO 4 /PPy/PANI nanoparticles were examined by XRD , SEM, TEM and EDX , Raman spectroscopy . When the ratio of pyrrole and aniline is 1:1, the polymerized PPy/PANI acted as the supporting matrix to effectively immobilize and prevent the aggregation of Ag 3 PO 4 nanoparticles. The catalytic performances of the Ag 3 PO 4 /PPy/PANI composites were confirmed for reduction of 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP) in the presence of NaBH 4 at room temperature by UV–vis spectroscopy. Results showed that the catalytic reduction effect of the Ag 3 PO 4 /PPy/PANI (1:1) on 2-NA is obviously better than that on 4-NP, which followed the pseudo-first-order kinetic, and the corresponding rate constants are 0.0053 min −1 and 0.022 min −1 , respectively, indicating that it has potential application in wastewater treatment in industries.
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高影响因子
Defence Technology
·
2021
·
IF 3.172
Wissam Bessa,Djalal Trache,Mehdi Derradji,Ahmed Fouzi Tarchoun
The design of astonishing combinations of benzoxazine resins with various fillers is nowadays of great interest for high quality products, especially in ballistic armors. The objective of this study is to investigate a new hybrid material prepared as multi-layered composite plate by hand lay-up technique. Different composites were manufactured from Kevlar fabrics reinforced polybenzoxazine, which was filled with silane treated microcrystalline cellulose (MCC Si) at various amounts in the interlayers. The developed materials were tested for their flexural, dynamic mechanical and ballistic performance. The aim was to highlight the effect of adding different amounts of MCC Si on the behavior of the different plates. Compared to the baseline, the dynamic mechanical and bending tests revealed an obvious decrease of the glass transition of 21 °C and a notable increase in storage modulus and flexural strength of about 180 %and17%, respectively, upon adding 1% MMC Si as filler. Similarly, the ballistic test exhibited an enhancement in kinetic energy absorption for which the composite supplemented with 1% MCC Si had the maximal energy absorption of 166.60 J. These results indicated that the developed panels, with interesting mechanical and ballistic features, are suitable to be employed as raw materials to produce body armor.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2021
·
IF 9.078
Wen Zheng,Yiru Li,Zhiyuan Xie,Moxi Liu,Aibo Zhang
A novel absorbing material with a flexible sandwich structure (S121) was designed and assembled using light-weight foams of Polydimethylsiloxane (PDMS) to achieve a full X-band absorption. The PDMS foams based on the composites of hollow polyaniline and MWCNTs (HPC) were prepared by means of impregnation technology selecting sugar cubes as a template. For the construction of sandwich S121, the upper and lower layers were HPC-PDMS foams (d foam = 1.0 mm) and the middle layer was HPC-PDMS film (d film = 0.5 mm). The SEM results revealed plentiful pores existed in S121, which would endow S121 with the traits of light-weight and lower density. The absorption performance of S121, single-layer HPC-PDMS foam (S1) and single-layer HPC-PDMS film (S2) had been characterized. Of importance, S121 achieved full absorption in X-band and its minimum reflection loss (RL min ) reached −32.65 dB at 9.5 GHz. In contrast, the RL min of S1 and S2 were only −15.42 dB and −11.72 dB. The frequency regions with RL < −10 dB of S1 and S2 were surprisingly narrow, which were 1.5 GHz and 0.4 GHz, respectively. The results indicated that the design of S121 demonstrated a synergistic effect of foams and film, which was helpful to enhance absorption and realize an X-band full absorption. Of great significance, due to the excellent flexibility of S121, after bending and compressing many times, RL min value is nearly identical to that of original S121, and the effective bandwidth is also full coverage of X-band. The results showed that the proposed S121 design is feasible for applications in X-band.
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