ELECTROCHEMISTRY COMMUNICATIONS
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2021
·
IF 4.724
Mao Yang,Jue Nan,Wei Chen,Anjun Hu,He Sun,Yuanfu Chen,Chunyang Wu
The thermal shrinkage of commercial polypropylene (PP) separator at high temperature seriously restricts the development of safe and stable lithium-sulfur (Li-S) batteries. To address such issue, herein, we present an interfacial engineering strategy by coating conductive polypyrrole (PPY) modified lithium-montmorillonite (PPY/Li-MMT) on the PP separator. The PPY/Li-MMT can service as an effective heat release layer to enhance the high-temperature stability of Li-S batteries. The engineered PP separator exhibits superior performance: it shows nearly no thermal shrinkage even up to 150 °C. Most importantly, the interface engineered separator has not be punctured during the hot piercing testing and the Li-S batteries deliver outstanding thermal stability even at 80 °C. In addition, the PPY/Li-MMT modified PP separator owns very high electrolyte uptake of 348.6%, large ionic conductivity of 3.63 mS cm −1 and stable performance over 600 cycles. This work provides an effective interfacial engineering strategy by coating PPY/Li-MMT interlayer to significantly improve the electrochemical performance and particularly the high-temperature stability of Li-S batteries.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wenjie Deng,Jie Yao,Lei Shi,Wensheng Wei,Fei Chen,Guangwen Xu
In catalytic chemistry, exploiting catalysts with superior activity and practicability is the ultimate goal. Herein, we found a brand-new organocatalyst 1-ethyl-3-methylimidazolium pyrrole ([EmIm]Py). Using in carbonate synthesis, this catalyst realized a record-breaking efficiency of 20.7 g DMC (mol Cat min) −1 even at 0℃. Notably, this catalyst did better in varied base-catalyzed reactions than most reported catalysts. [EmIm]Py also exhibited potential operability in dimethyl carbonate (DMC) industrial production. The mechanism of propylene carbonate (PC) and methanol interesterification over [EmIm]Py catalyst was proposed by a combination of experimental and theoretical studies.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Yuncheng Ye,Xin Guo,Yongjun Ma,Qi Zhao,Yan Sui,Jia Song,Weijing Ma,Pengxue Zhang,Chuanli Qin
Transition metal sulfides have attracted extensive attention as promising electrode materials for advanced supercapacitors. However, their poor electronic conductivity and low utilization rate of the unfavorable structure still hinder energy-power outputting performance of supercapacitors. Herein, polypyrrole nanotubes@nickel-molybdenum sulfide (PNTs@NiMoS) core–shell composites were successfully synthesized via a one-step hydrothermal method in which honeycomb-like NiMoS nanoflakes were in-situ grown on the surface of PNTs. The introduction of PNTs with high conductivity as the core facilitates the rapid transportation of electrons and ions besides providing pseudocapacitance. And the in-situ grown NiMoS nanoflakes with special honeycomb-like as the shell provide much active sites accessible to electrolyte ions for charge storage. Owing to the synergistic electrochemical contributions from PNTs and NiMoS, the ratio-optimized PNTs@NiMoS exhibits the high specific capacitance of 1557.2 F g −1 at 1 A g −1 , remarkably superior to NiMoS (885.1 F g −1 ), PNTs (172.2 F g −1 ) and other reported bimetallic sulfides-based electrode materials. Moreover, the assembled asymmetric supercapacitor in 6 M KOH electrolyte with PNTs@NiMoS as the positive electrode and N-doped carbon nanotubes as the negative electrode delivers a superior energy density of 35.8 Wh kg −1 at a significantly high power density of 13719.1 W kg −1 , much higher than previously-reported similar supercapacitors. Furthermore, the asymmetric supercapacitor exhibits good cycling stability with the capacitance retention of 84.9% after 5000 cycles. This study offers a feasible strategy to design electrode materials with special microstructure for high-performance energy storage devices.
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ACS Applied Nano Materials
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2021
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IF 5.097
Junping Zheng,Yu Liu,Cheng Ye,Yang Liu,Zhigang Zhang,Mingzhu Yin,Qinghua Gao,Hongtao Liu
Monitoring H2O2 has profound meaning for food safety and life health. Generally, non-enzymatic H2O2 biosensors based on nanomaterials are subject to tedious preparation and short working life. In this study, a facile H2O2 biosensor was proposed for simultaneously realizing rapidity, simplicity, sensitivity, and selectivity. The in situ electro-polymerized polypyrrole functionalized with electrodeposited platinum-palladium nanoparticles (PPy-PtPd) was used as the H2O2 sensing element. The Pt7Pd4 bimetallic nanoparticles may bind PPy through an NH–metal interaction and endow glassy carbon electrodes robust electrocatalytic performance to H2O2. By parameter optimization, this H2O2 biosensor showed favorable electrochemical performance toward H2O2 reduction with a wide detection range of 2.5–8000 μM, high sensitivity (1360.83 μA·mM–1·cm–2), favorable anti-interference property, reproductivity, and outstanding endurance (> 60 days at room temperature). Importantly, the proposed biosensor worked successfully for the determination of H2O2 in three kinds of biological samples. The electrochemical biosensor using nanocomposites from electrochemistry provides a simple-make and easy-use strategy for biosensor design. In the future, PPy-PtPd NPs can be easily integrated onto high-end devices including microelectrodes and implantable and wearable biosensors for detecting H2O2in vivo and in vitro.
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POLYMER ENGINEERING AND SCIENCE
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2021
·Vol. 61
·期 7
·1982-1990
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IF 2.428
Chengcheng Zhang,Qiang Ren,Dahu Cheng,Chunyang Li,Jiaming Yang,Hong Zhao
To study the effect of nano conducting materials on the direct current (DC) dielectric properties of low density polyethylene (LDPE), polypyrrole nanospheres are prepared by the soft template method and then melt-blended with LDPE to obtain LDPE/polypyrrole nanocomposites. The micro-structure, space charge distribution, thermally stimulated depolarization current, DC conductivity and DC breakdown strength of the nanocomposites are investigated. The results show there is interaction between polypyrrole nanospheres and LDPE, which will not affect the crystal structure of LDPE, but slightly increase the crystallinity of LDPE/polypyrrole nanocomposites. Polypyrrole nanospheres can introduce deep traps in LDPE to capture space charge carriers, which will suppress the accumulation of space charges in LDPE and reduce the DC conductivity. The DC breakdown strength of LDPE/polypyrrole nanocomposites is improved slightly by adding a small amount of polypyrrole nanospheres.
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ELECTROCHIMICA ACTA
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2021
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IF 6.901
Yanmeng Cai,Yue Wang,Yazhen Zhao,Shixuan Wang,jixiao Wang
The structural characteristics of electrode material greatly affect desalination performance of capacitive deionization (CDI) process. Currently, there appears a new trend to develop novel materials with improved salt adsorption ability by designing reasonable hollow and robust spatial supporting structure. Herein, we report a novel hollow porous bottle-like carbon supporting framework (HPBC) derived from β-cyclodextrin for enhancing the CDI performance. The superior framework endows HPBC with large surface area, robust spatial supporting structure, optimized ion diffusion pathway, and ample ion storage space. By coupling ion-doped polypyrrole layer with HPBC, two types of composite materials (PPy-Cl/HPBC and PPy-DBS/HPBC) are developed with the integrated advantage of electrical-double layer ion storage process and ion-exchange pseudo-capacitive behavior. Electrochemical tests results indicate that both composite electrodes present considerable specific capacitances of 241.6 and 210.2 F g −1 , fast charge transfer rate, and stable cycling performance. When PPy-Cl/HPBC and PPy-DBS/HPBC electrodes are assembled into the CDI cell (named cell Cl/C-DBS/C), the cell demonstrates the superior desalination ability of 34.5 mg g −1 . Furthermore, the CDI cell Cl/C-DBS/C exhibits fast salt adsorption rate (4.0 mg g −1 min −1 ), prominent charge efficiency (77.6%), and excellent deionization stability after multi-regeneration cycles owing to the synergetic effect of ion-exchange ability of the PPy layer and the unique structural characteristics of HPBC. The CDI cell Cl/C-DBS/C also shows preferable adsorption of monovalent ions to divalent ions in the multi-salt solutions.
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POLYMER
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2021
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IF 4.43
Xing Zhou,Renfang Song,Dong Wang,Changqing Fang,Qiang Wang,Jingrui Deng
Integrating polymer with biological matters to form hybrids or conjugates is innovative in organic/organic system with significantly promise for sensor, medical, and materials science. In this work, a uniform 2D nanofilm with the hybridization of lysozyme and polypyrrole was prepared at the air/water interface. Lysozyme was employed as the biological adhesion template, and the polypyrrole conductive layer assembled onto lysozyme film, forming a hybrid and functional film with both conductivity and bio-adhesion. The functionality and potential applications of the hybrid film were investigated by detecting the conductivity, patterning and antibacterial property. The hybrid film presents refined patterning through UV lithography , and significant antibacterial property by dissolving the outer wall of bacteria. Owing to the significant conductivity, the mechanical sensor can detect the tiny airflow changes effectively, such as tiny vibrations from human throat and basic locomotion. It supplies a path to prepare functionally flexible nanofilm in organic/organic system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yingjie Chen,Chong Gong,Zhihao Shi,Di Chen,Xing Chen,Qian Zhang,Beili Pang,Jianguang Feng,Liyan Yu,Lifeng Dong
A melt-salt-assisted method is utilized to construct an onion-like hybrid with Co/CoO nanoparticles embedded in graphitic Fe-N-doped carbon shells (Co/CoO@FeNC) as a bifunctional electrocatalyst. The iron-polypyrrole (Fe-PPy) is firstly prepared with a reverse emulsion. Direct pyrolysis of Fe-PPy yields turbostratic Fe-N-doped carbon (FeNC) with excellent oxygen reduction reaction (ORR) electrocatalysis, while the melt salt (CoCl 2 ) mediated pyrolysis of Fe-PPy obtains onion-like Co/CoO@FeNC with a reversible overvoltage value of 0.695 V, largely superior to Pt/C and IrO 2 (0.771 V) and other Co-based catalysts reported so far. The ORR activity is mainly due to the graphitic FeNC and further enhanced by Co N x bonds, whereas the oxygen evolution reaction (OER) activity is principally due to the Co/CoO composite. Concurrently, Co/CoO@FeNC as cathode catalyst enables Zn-air battery with a high open circuit voltage of 1.42 V, a peak power density of 132.8 mW cm −2 , a specific capacity of 813 mAh g Zn −1 , and long-term stability.
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PubMed
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Dong Liu,Qi Zhang,Haiyan Pei,Wei Pan,Yingliang Liu,Shengang Xu,Shaokui Cao
In recent years, low-cost wearable energy storage devices attract much more attention. In this work, the PET/CuS/PPy composite electrodes are fabricated for portable flexible solid-state supercapacitors (FSSC), originating from the insulating PET fabric substrate. In this occasion, the functional layer of copper sulfide (CuS) are designed and chemically deposited on the insulating PET fabric to synchronously develop its dual functions such as high electrical conductivity and large capacitance. As a result, the PET/CuS/PPy electrode shows a high specific capacitance of 5410 mF cm–2 at 2 mA cm–2 and good cyclic stability (retaining 84.1% after 2000 cycles). This excellent recyclable specific capacitance is ascribed to the outstanding homogenous binder-free conductive morphologies of CuS and PPy, forming the rapid electronic and ionic transfer channels. Especially, the synchronous dual functions of CuS including high electrical conductivity and large capacitance play a more important role in the large specific capacitance. The flexible solid state supercapacitor (FSSC) also bears a superior specific capacitance of 1335 mF cm–2 (10.1 F cm–3) at 2 mA cm–2 and an outstanding energy density of 1.4 mW h cm–3 at the power density of 8.4 mW cm–3, together with fine flexibility and cyclic stability. Four serially connected FSSC devices can easily supply the electric power for LED indicator lights, calculators, and electric fans, indicating the prospective practical applications in portable flexible energy storage devices. This work provides a facile approach to develop the synchronous dual roles of CuS, which will have the extensive applications in wearable flexible E-textiles.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Shuangjie Sun,Yameng Wang,Binbin Sun,Feifei Zhang,Qing Xu,Hao-Yang Mi,Heng Li,Xiaoming Tao,Zhanhu Guo,Chuntai Liu,Changyu Shen
Solar steam generation is an efficient way of harvesting solar energy for water purification. Developing a versatile solar absorber with salt resistance and the capability to purify an oil-in-water emulsion is a grand challenge. Herein, a polypropylene (PP) nonwoven fabric-based photothermal absorber is fabricated by the combination of carbon nanotubes (CNTs), polypyrrole (PPy), and a fluorinated hydrophobic coating in a layer-by-layer approach. The specially designed architecture displays a hierarchical microstructure and Janus wetting properties, facilitating solar absorption and heat generation on the evaporation surface, and can effectively prevent salt crystallization. The water layer formed on the superhydrophilic/underwater superoleophobic bottom surface could repel oil droplets and form a channel to advect concentrated salt back into bulk water, which enabled high purity separation of an oil-in-water emulsion and continuous desalinization of seawater without the reduction of the evaporation rate. As a result, the solar absorber can achieve a remarkable evaporation rate of 1.61 kg m–2 h–1 and an energy efficiency of 91.2% under 1 sun irradiation and shows extraordinary performance in the purification of contaminated wastewater (over 99.8% purity). The strategy proposed provides a pathway for developing versatile high-performance solar absorbers for the sustainable treatment of saline water, wastewater, and oil-containing water.
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Materials Science & Engineering C-Materials for Biological Applications
·
2021
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IF 7.328
Na Guo,Feng Cang,Zhen Wang,Ting-Ting Zhao,Xin-Rui Song,Stefano Farris,Yan-Yan Li,Yu-Jie Fu
Microbial contamination of water represents a great threat to the public health that has attracted worldwide attention. In this work, polypyrrole magnetic nanoparticles (Fe 3 O 4 @PPy NPs) with sterilization properties were fabricated. More specifically, the Fe 3 O 4 @PPy NPs obtained via aqueous dispersion polymerization and an in situ chemical oxidative polymerization exhibited a cationic surface and high photothermal conversion efficiency. More than 50% of bacteria adsorption can be achieved at a dosage of 100 μg/mL Fe 3 O 4 @PPy NPs under magnetic field, and high photothermal sterilization efficacy (~100%) can be obtained upon NIR exposure at the same dosage for 10 min. Noteworthy, the Fe 3 O 4 @PPy NPs can be recycled by magnetism and reused without affecting their photothermal sterilization capability. This study clearly provides experimental evidence of the great potential of Fe 3 O 4 @PPy NPs as stable and reusable nanocomposite materials for bacteria adsorption and photothermal sterilization performance. The application of Fe 3 O 4 @PPy NPs can realize enviromental-friendly bacterial contaminated water treatment as well as provide stratgies for synergistical antibacterial materials design.
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ACS Applied Energy Materials
·
2021
·
IF 6.024
Yang Zang,Hui Luo,Hang Zhang,Huaiguo Xue
Layered double hydroxides (LDHs), composed of typical lamellar architectures, have become splendid electroactive materials for supercapacitors by means of large specific surface area and high theoretical capacitance. However, severe agglomerations and poor conductivities of single LDHs are disadvantageous to obtain the excellent electrochemical performance. Herein, polypyrrole nanotubes (PNTs) with good conductivity and mechanical capacity were prepared for in situ growth of ZIF-67, and the obtained PNT@ZIF-67 nanocomposites could serve as effective sacrificial templates and Co2+ sources. After a facile solvothermal reaction and acid etching, three-dimension hierarchical PNT-interconnected nickel cobalt-layered double hydroxide (PNT@NiCo-LDH) nanocages were successfully synthesized to construct the supercapacitors, in which the formed networking hierarchical structure could facilitate the uniform distribution of ZIF-67-derived NiCo-LDH nanocages, not only providing an enhanced conductivity and cycling stability but also achieving outstanding specific capacitance (1448.2 F g–1 at 1 A g–1). Additionally, the asymmetric supercapacitor, assembled by positive PNT@NiCo-LDH and negative activated carbon, could achieve an excellent energy density of 64.4 Wh kg–1 at 800 W kg–1 and endure a satisfactory cycling stability with 84.3% capacitance retention over 5000 cycles, which was superior to the electrochemical properties of the NiCo-LDH-dependent asymmetric supercapacitor, showing a promising prospect in high-performance supercapacitors.
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