Journal of Energy Storage
·
2023
·
IF 9.4
Shuzhen Cui,Yaya Lv,Wenxing Miao,Wenbo Hou,Xiangbing Wang,Qinzheng Hu,Kanjun Sun,Hui Peng,Guofu Ma
Conventional polyvinyl alcohol-based gel electrolytes are generally limited in ionic conductivity and cannot well meet the requirements of the self-healing and flexible smart device . Herein, we design a highly conductive hydrogel electrolyte (ionic conductivity up to 84 mS cm −1 ), based on cross-linked aqueous acrylamide (AAm) solution in the presence of poly(N-vinylpyrrolidone) (PVP), with excellent self-healing capability by intermolecular hydrogen bonds between PVP and PAM. The self-healing all-in-one flexible supercapacitor fabrication with the gel electrolyte and in-situ polymerization polypyrrole (PPy) electrode can achieve repeated healable 5 cycles without extra addition, stretch up to 750 % compared with the original lengths and bend different angles with slight performance decay. This work provides new idea for the synthesis of highly conductive, self-healing and flexible hydrogel electrolyte to promote the development of all-in-one supercapacitor with high specific capacitance for practical applications in flexible and wearable electronics .
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yilin Wu,Xinlan Zhu,Dongyang Miao,Jun Song,Shaohai Fu,Jichao Zhang
Oily wastewater, resulting from oil recovery, petrochemical industries, or accidents, poses a significant threat to the aquatic environment. Membrane separation technology can offer unprecedented opportunities for highly efficient water remediation but at the cost of poor permeability and serious oil fouling. Here, we report a faveolate nanofibrous membrane through the steric growth of bismuth oxybromide-bismuth oxyiodide nanoflakes on the TiO 2 /polypyrrole nanofibers. The spatially faveolate cells create highly covered confined spaces that efficiently capture and coalesce nanosized oil droplets, thus achieving substantial selectivity for micron porous membranes. The faveolate membranes are capable of efficiently separating various oil-in-water emulsions, particularly nanoscale surfactant-stabilized emulsions with a high permeation flux of 6075 L m -2 h −1 and a good separation efficiency of 99.95 %. Moreover, the membranes with multi-heterostructure act as efficient photocatalysts, giving rise to visible light-induced sufficient fouling-tolerant property with nearly zero irreversible oil fouling. This study could provide a novel strategy for developing a new generation of membranes with high performance and long service lifetime for oily sewage remediation.
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Journal of Energy Storage
·
2023
·
IF 9.4
Jinghao Huo,Xin Wang,Xinyi Zhang,Lifeng Zhang,Gentian Yue,Shouwu Guo
Aqueous zinc-ion hybrid supercapacitors (ZISCs) are a kind of energy storage device with promising applications due to their easy assembly, low cost, safety and reliability. Polypyrrole (PPy)-derived carbon is usually used as a cathode material for ZISCs with N-doping originating from the polymer structure and simple preparation. Herein, the porous PPy-derived carbon nanotubes (PCNTs) are prepared by calcination and KOH activation. The microstructure and physicochemical properties of PCNTs can be optimized by regulating the mass ratio of KOH to PPy-derived carbon. The high specific surface area (3537 m 2 g −1 ), hierarchical porous structure , and high contents of O/N-codoping (12.02 at.% and 3.39 at.%), the PCNTs process high specific capacity and excellent cyclic stability. ZISCs based-PCNTs cathode and Zn anode obtain a high specific capacity of 387.8 mAh g −1 at a current density of 0.2 Ag −1 , superior rate capability (127.2 mAh g −1 at 20 Ag −1 ), large energy density (151 Wh kg −1 ), and power density (12.695 kW kg −1 ). Furthermore, after 10,000 GCD tested at 5 A g −1 , the capacity retention of ZISCs is 90.9 %. This study provides a valuable reference for regulating the microstructure of porous carbon derived from other polymers and promoting its application in aqueous ZISCs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoyue Ren,Qingli Tian,Xiaoshuai Zhu,Hao-Yang Mi,Xin Jing,Binbin Dong,Chuntai Liu,Changyu Shen
Commercial foam based piezoresistive sensors are promising flexible sensing units for wearable devices, while they suffer from relative low sensitivity, especially in low pressure range. Herein, inspired by scorpion slit organs, multi-scale closure piezoresistive sensors are developed by self-polymerization of a polydopamine (PDA) layer and a polypyrrole nanofibers (PPy NFs) layer on polyurethane (PU) foam, and constructing a macroscopic narrow orifice configuration (NOC), which allows the generation of a great mount of conductive paths at low pressure. The synergetic effects of inner space closure, pore collapse, and PPy NFs contact contributed to an ultra-high sensitivity of 0.8251 kPa −1 , which surpasses reported foam-based sensors. The developed NOC foam possesses fast response time and recovery time (120 ms and 100 ms), high linearity, and excellent stability. Moreover, the sensor can be used to precisely detect the human walking, running, and jumping behaviors, and the grabbing force. When integrated into a sensing array, the NOC PPP foams demonstrated excellent potential to be used in human activity monitoring such as yoga postures and sleeping positions. This work provides new thoughts for designing biomimetic highly sensitive piezoresistive sensors and enhancing the foam stability using PPy NFs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
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IF 9.9
Peng Song,Congcong Li,Xiaohui Yao,Dongyang Zhang,Ningmiao Zhao,Yue Zhang,Keqiang Xu,Xiaojuan Chen,Qi Liu
Planar wearable supercapacitors (PWSCs) have sparked intense interest owing to their hopeful application in smart electronics. However, current PWSCs suffered from poor electrochemical property, weak flexibility and/or large weight. To relieve these defects, in this study, we fabricated a high-performance PWSC using silk protein derived film electrodes (PPy/RSF/MWCNTs-2; RSF, PPy and MWCNTs represent regenerated silk film, polypyrrole and multi-walled carbon nanotubes, respectively, while 2 is the mass ratio of silk to MWCNTs), which were developed by ‘dissolving-mixing-evaporating’ and in situ polymerization. In three-electrode, PPy/RSF/MWCNTs-2 showed a superb area specific capacitance of 8704.7 mF cm −2 at 5 mA cm −2 , which surpassed numerous reported PWSC electrodes, and had a decent durability with a capacitance retention of 90.7 % after 5000 cycles. The PPy/RSF/MWCNTs-2 derived PWSC showed a largest energy density of 281.3 μWh cm −2 at 1660.1 μW cm −2 , and a power density as high as 13636.4 μW cm −2 at 125.6 μWh cm −2 . Furthermore, impressive capacitive-mechanical stability with a capacitance retention of 92 % under bending angles from 0 to 150 was depicted. Thanks to the rational and affordable preparation, our study for the first time prepared RSF electrode that had great capacitive property, high mechanical flexibility and light weight, simultaneously. The encouraging results can not only open up a new path to manufacture high-performance flexible electrodes, but may also help to realize the high-value-added utilization of silk.
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Composites Part C: Open Access
·
2023
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IF 4.2
Yanan Zhao,Jixiu Jia,Chunlu Li,Chuanping Feng,Zonglu Yao,Nan Chen
Developing efficient nitrate removal technologies is crucial for ensuring the safety of drinking water, a polypyrrole-grafted activated carbon (PPy-AC) was synthesized via in situ chemical oxidative polymerization to enhance nitrate adsorption from water. It was showed that the PPy-AC composite featured a maximum adsorption capacity of 13.36 mg NO 3 − -N/g and exhibited high selectivity toward nitrate in the presence of co-existing anions. The PPy-AC composite exhibited a considerable capacity for adsorbing nitrate over a wide pH range of 3.0–9.0. The absorption performances were well-fitted by the Redlich-Peterson isotherm model, and the adsorption kinetics were well-described by the pseudo-second-order equation. Furthermore, the mass and charge balance calculations showed that 8.4% of the nitrogen atoms in the PPy-AC facilitated the adsorption of nitrate. The mechanisms of nitrate removal by the PPy-AC composite were determined through the electrostatic attraction and ion-exchange process, in which the nitrate ions are replaced by doped chloride ions, and the other N + sites in PPy were occupied by nitrate ions. The PPy-AC is a promising material for the nitrate removal from wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Lin Han,Yueqin Li,Chen Chen,Zichun Lu,Lingke Liu
Developing all-gel supercapacitors with high capacitance and stretchability remains a challenge. Herein, high mass of electroactive anthraquinonemonosulfonate(AQS)-doped polypyrrole (PPy) nanoparticles templated by poly(vinyl alcohol) (PVA) have been loaded into poly(acrylic acid) (PAA) hydrogel. The extra energy storage of AQS significantly enhances the electrochemical performance of the obtained PPy-AQS-PVA/PAA hydrogel electrodes. As a result, the assembled symmetrical supercapacitor can deliver a large areal specific capacitance of 392.5 mF/cm 2 , a high energy density of 34.89 μWh/cm 2 and an enhanced cycling performance with 118% capacitance retention after 5000 CV cycles. Besides, such a device can work normally under various deformations and at extreme temperatures. Notably, the PPy-AQS-PVA/PAA hydrogels exhibit sustainable sensing capability for strain. When integrated the flexible supercapacitor with the strain sensor, a promising self-powered sensing system can monitor both large and subtle human movements accurately. Therefore, the multifunctional conductive PPy-AQS-PVA/PAA hydrogels have great potential in flexible electronic devices.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Guangli Li,Xiaoman Qi,Jingtao Wu,Xuan Wan,Tianyu Wang,Ying Liu,Yuwei Chen,Yonghui Xia
The overuse of pefloxacin (PEF) leaves residues in foods. Therefore, the development of robust analytical techniques for the selective detection of PEF is of great importance. In this study, a highly stable electrochemical sensing platform has been constructed, using molecularly imprinted polymer (MIP)-coated gold nanoparticle/black phosphorus nanocomposites (BPNS-AuNPs), for the selective detection of PEF. BPNS-AuNPs significantly enhance the black phosphorus (BP) stability and electrochemical activity and offer a larger surface area to accommodate more imprinted sites for selective PEF binding. MIP/BPNS-AuNPs exhibit a broad linear detection range (0.005–10 μM), low detection limit (0.80 nM), and high sensitivity (3.199 μA μM −1 ). The MIP/BPNS-AuNPs show a high binding affinity for PEF, even in the presence of structural analogs, and maintain stable voltammetric signals for at least 35 d. The MIP sensor exhibits consistent high sensitivity in the detection of PEF in real milk and orange juice samples.
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VACUUM
·
2023
·
IF 4
Jingyan Tian,Leilei Zhang,Junnan Li,Lian Ma,Jianhao Wang,Zebin Chen,Yuping Wu,Qianting Wang,Xiaoyun Ye
With the development of radar stealth technology and electronic communication technology, electromagnetic (EM) wave absorbing materials with lightweight and broad absorbing bandwidth are widely expected. In this study, the multi-walled carbon nanotubes (MWCNTs)/reduced graphene oxide (rGO)/polypyrrole (PPy) ternary composites were prepared by in-situ polymerization under hydrothermal conditions. The effects of carbon substrate of MWCNTs/rGO and the content of PPy on the microwave absorption (MWA) properties of the ternary composites and the corresponding attenuation mechanism were investigated. The results showed that MWCNTs and rGO nanosheets interweave together to form a relatively uniform micro-network structure with even wrapping of PPy on the surface of MWCNTs/rGO substrate. The adjustable amount of PPy optimizes the impedance matching and EM wave attenuation capacity. The composites achieve effective absorption bandwidth (EAB) of 4.6 GHz at 2.1 mm, and the minimum reflection loss (RL min ) value of −57 dB at 15.8 GHz. The multi-void network structures formed by MWCNTs and lamellar rGO and the interfacial polarization between MWCNTs/rGO composite carbon substrate and PPy can effectively decay EM wave absorption, thus improving the MWA performance of the composites. This work provides an effective reference for the application of multi-component carbon composites in the field of microwave absorption.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2023
·
IF 2.5
Lin Yueming,Dai Huimin,Su Siyu,Zhu Xiaohong
The hydrophilicity of carbon cloth was improved through pretreatment using an oxidation process resulting in activated carbon cloth with microscopically pronounced grooved cracks. This activated carbon cloth served as a highly hydrophilic substrate suitable for electrode material loading while also possessing attractive electrochemical properties. Polypyrrole/reduced graphene oxide (PPy/rGO) composites were subsequently polymerized and chemically reduced in situ on the pretreated carbon cloth (HCC), introducing nitrogen atoms of different valences into the composite. Contact angle and electrochemical tests demonstrate that the prepared electrode material displayed enhanced hydrophilicity and low impedance. Based on HCC/PPy/rGO, the symmetrical flexible quasi-solid supercapacitor exhibited a high energy density of 0.60 mWh cm −3 at a power density of 6.25 mW cm −3 , as well as a great power density of 62.5 mW cm −3 at 0.34 mWh cm −3 and good flexibility. Moreover, three fabricated supercapacitor devices connected in series illuminated a white LED for about 4 min, demonstrating the potential use of pretreated-carbon cloth/polypyrrole/rGO materials for flexible wearable devices.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Chengyi Wang,Yangbo Qiu,Chao Wang,Yubo Xu,Long-Fei Ren,Jiahui Shao
Fluoride (F − ) pollution in groundwater is an important environmental issue and capacitive deionization (CDI) holds promise for defluorination at moderate concentrations (e.g., 200 −1000 mg L −1 ). However, existing electrodes suffer from the overlap of electrical-double-layer (EDL) and severe co-ion effects at low (e.g., <200 mg L −1 ) and high sodium fluoride (NaF) concentrations (e.g., >1000 mg L −1 ), respectively, exhibiting poor salt adsorption capacity (SAC). Hence, a three-layer structured electrode, “membrane/carbon nanotube (CNT)/activated carbon (AC)” (CNT-MCE), was prepared through electrospinning CNT onto AC, followed by a polymer membrane coating. Compared to AC and membrane coated electrode, CNT-MCE with mesopore-dominated structure prevented EDL overlap, achieving a higher SAC of 40.8 mg g −1 at 100 mg L −1 NaF. At 1500 mg L −1 NaF, the positively charged CNT-MCE exhibited an improved SAC of 58.8 mg g −1 by inhibiting co-ion effects. Meanwhile, CNT-MCE consistently demonstrated superb SACs at 200 − 800 mg L −1 NaF and maintained excellent stability over a wide concentration gradient by inhibiting severe oxidation. Notably, CNT-MCE successfully decreased the F − concentration in simulated groundwater from 3.4 to 1.1 mg L −1 . Overall, our work provides an efficient strategy of electrode design to broaden the applicability of CDI for groundwater defluorination over a wide concentration gradient.
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Nano-Micro Letters
·
2023
·Vol. 15
·期 1
·1-15
·
IF 26.6
Yu Zhen,Su Yuqing,Gu Ruonan,Wu Wei,Li Yangxi,Cheng Shaoan
Micro–nano water film enhanced interfacial solar evaporator enables a high evaporation rate of 2.18 kg m −2 h −1 under 1 sun.
An outdoor device with an enhanced condensation design demonstrates a high water production rate of 15.9–19.4 kg kW −1 h −1 m −2 .
A multi-objective predictive model is established to assess outdoor water production performance.
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危险品化学品经营许可证（带存储）