MACROMOLECULAR RAPID COMMUNICATIONS
·
2023
·
IF 4.6
Chunyan Cao,Tao Huang,Yunming Li
Conductive polymer hydrogels are vital instrain sensors, yet achieving high resilience and toughness is a challenge. This study employs a prestretch method to engineer a tough conductive polymer hydrogel with sufficient resilience. Initially, a blend film of polyvinylalcohol (PVA) and ethylene-vinyl alcohol copolymer (EVOH) is prepared through solution casting, followed by a swelling process to form a PVA-EVOH hydrogel. This hydrogel, with PVA crystallites as crosslinking points, exhibits high toughness. The hydrogel is then immersed in pyrrole and ferric chloride solutions for in-situ polymerization of polypyrrole (PPy), creating a conductive PPy/PVA-EVOH hydrogel. Finally, a 200% prestretch is applied, breaking short chains within the network, eliminating energy dissipation at low strains. This results in a hydrogel with a 100% elastic deformation range, while maintaining high fracture toughness (1700 J m -2 ). The prestretched PPy/PVA-EVOH hydrogel functions as a strain sensor with low hysteresis, providing consistent strain measurements during loading and unloading. This outperforms the non-prestretched sample, which shows inconsistent responses between stretching and releasing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zifan Li,Yueyue Wu,Xu Luo,Xuemei Dong,Keyuan Pan,Fei Xiu,Juqing Liu
Room-temperature phosphorescence (RTP) holds tremendous potential in various fields such as optoelectronic devices, bioimaging, and information security applications. However, achieving efficient RTP in aqueous environments has been a challenge due to nonradiative deactivation caused by dissolved oxygen and solvent-induced relaxation. In this study, we propose a design strategy to enhance the phosphorescence emission of carbon dots (CDs) in aqueous solutions by constructing hydrogen-bonded networks between CDs and ammeline (AM). The formation of robust hydrogen-bonded networks, combined with the synergistic effect of bound water, significantly enhances the phosphorescence emission by stabilizing the triplet excited states of CDs. Furthermore, the prepared AM-CD suspension exhibits an exceptionally long phosphorescence lifetime of up to 697.58 ms, showcasing its potential applications in two-photon information encryption and decryption.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Ling Wang,Yawen Li,Yang Yu,Luxuan Guo,Chencan Li,Zhuo Zhang
Hygroscopic hydrogels have been receiving widespread attention as effective atmospheric water harvesters due to their freshwater production capabilities for alleviating water scarcity stress in arid regions. Nevertheless, not only can the hydrophilic networks notably hinder water release but also harsh preparation conditions (UV light and oxygen-free environment) are required to achieve free-radical polymerization. Herein, facile and processable moisture-harvesting hydrogel paints (MHPs) have been developed to address these challenges. Benefiting from the high tunability and processability, the MHPs can be optionally cured into moisture-harvesting hydrogels (MHGs) with different sizes by various operations according to actual circumstances, manifesting their potential for multiscenario applications. Via the synergistic effect of thermal-responsive networks and hygroscopic components, the MHGs can harvest atmospheric water with a broad range of relative humidities (RH, 10–90%), high water uptake (highest ∼50% of hydrogel’s own weight at ∼90% RH, 25 °C within 24 h), fast moisture-absorbing rate (up to ∼0.23 g g–1 h–1 at ∼90% RH, 25 °C), low energy, rapid water release rate (∼0.2 g g–1 h–1 at ∼90% RH, 4 °C), and outstanding cycling stability. Also demonstrated is a proof-of-concept outdoor water-collecting system, which possesses ∼2.5 mL g–1 (L kg–1) water yield per day to satisfy an adult’s daily water demand. Our low-cost and easy-to-scale-up MHGs can provide a viable solution to design next-generation atmospheric water harvesters for achieving efficient, sustainable, and multiscenario applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Guowei Yu,Chen-Yang Wang,Wenda Dong,Ya-Wen Tian,Zhaoyun Wang,Jingyi Lu,Pu Hu,Yong Liu,Min Yan,Yu Li,Zhitian Liu
Inhibiting the shuttle effect and propelling polysulfide conversion by introducing a suitable sulfur container has been proven as a promising strategy to enhance the cycle life of lithium-sulfur (Li–S) batteries. Here, a unique three-dimensional (3D) inter-connected framework assembled with SO 4 2− -doped polypyrrole (PPy-SO 4 ) nanowires is proposed. The doping SO 4 2− anion in a polymer skeleton could confine lithium polysulfides (LiPSs) by polar-polar interaction to inhibit the shuttle effect and enhance the conductivity of PPy to accelerate polysulfide conversion. Moreover, the electrostatic coupling between SO 4 2− anion and Li + , as well as between –N + – and S n 2− , at polypyrrole /electrolyte interface can effectively regulate the redox kinetics of polysulfide. Besides, the inter-connected framework creates a large contact surface for sulfur and high-flux paths for electron transport. Consequently, the Li–S batteries assembled with PPy-SO 4 /S cathode exhibit a stable capacity of 501 mAh g −1 after 350 cycles at 1C, showing a low decay rate of 0.09% per cycle. Notably, the efficiency of the anion doping strategy is further verified in the pouch cell, realizing a capacity of 480 mAh g −1 after 250 cycles. This work illustrates that anion doping with rational structural design is a feasible solution to boost the electrochemical performance of Li–S batteries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Composites Part C: Open Access
·
2023
·
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.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
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.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Peng Wang,Shuang Liang,Xiaohua Li,Zhanying Sun,Haoran An,Na Li
High temperature can cause aging of materials , so it is urgent to investigate self-healing materials with low temperature positioning and self-healing ability. In this paper, water-based polyurethane/polypyrrole nanocomposites with NIR-induced self-healing properties (SWPUA/PPy) were prepared by mixing polypyrrole nanoparticles (PPy) as photo-thermal conversion agent with self-healing waterborne polyurethane emulsion (SWPUA). The effects of PPy content on thermal stability, mechanical properties and self-healing effects of SWPUA/PPy nanocomposites were investigated. The results showed that the addition of PPy had little effect on the chemical structure of SWPUA, and a small amount of PPy could make the material have excellent NIR-induced self-healing properties. When PPy content was 0.0125 wt %, the self-healing efficiency of NIR irradiation for 40 min was 89.25 %. Besides, the addition of PPy also improved the thermal stability and tensile strength of SWPUA/PPy samples.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Ma,Xiangyi Zhang,Chenshan Dong,Huiyu Yang,Kaimin Deng,Mengyao Zhu,Ziwei Deng,Jingjing Huang,Shaojin Gu,Xin Liu,Bin Shang
Engineering the pore structure of evaporator to effectively integrate water and thermal management is critical for efficient solar-driven interfacial vapor generation. Here, inspired by the unique structure of Benincasa hispidas , a bioinspired pore-gradient aerogel was fabricated for the first time. Experiments and numerical simulations reveal that the unique anisotropic porous structure of aerogel, which consists of small-pores at top region and large-pores at bottom region, enabling it to maximize the heat gains from the sunlight and localize the generated heat while provide adequate water supply concurrently. Under solar illumination (1 kW m −2 ), the fabricated aerogel can achieve a high evaporation rate of 2.49 kg m −2 h −1 , and the calculated energy efficiency is approximately 96.3 %, which is comparable to most of state-of-the-art evaporators. Additionally, with this aerogel employed, effective purification toward various undrinkable water can be achieved. This work derives from nature, providing us a design blueprint to integrate water and thermal management in a bulky material, and it is expected to advance one step further toward the design and practical application of high-performance solar evaporators.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Wenfeng Zheng,Lingling Fan,Zhenghua Meng,Jiangang Zhou,Dezhan Ye,Weilin Xu,Jie Xu
Polypyrrole (PPy)/cellulose nanofiber (CNF) composites have been widely used in flexible energy storage devices because of their lightweight, inherent mechanical flexibility and large specific surface area. However, it is still a challenge to obtain PPy/CNF composite electrodes with high cycling stability. Herein, an electrostatic self-assembly strategy was adopted to deposit anion-doped PPy onto cationic poly(methacryloxyethyltrimethyl ammonium chloride)-grafted bacterial cellulose (BCD) nanofibers. The optimized PPy@BCD electrode demonstrated a high areal capacitance of 6208 mF cm −2 at a current density of 0.5 mA cm −2 and superior cycling stability (a capacitance retention of 100 % after 10,000 charge-discharge cycles at 10 mA cm −2 ). A quasi-solid-state anti-freezing flexible supercapacitor (AF-FSC) was designed by employing polyacrylamide organohydrogel electrolyte, yielding an areal capacitance of 2930.6 mF cm −2 at 1 mA cm −2 and a capacitance retention of 92.2 % after 1000 cycles at −20 °C. The present AF-FSC is expected to serve as a power source in real-life low-temperature applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
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.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2023
·
IF 7.8
X. Jiang,J. Liu,J. Ren,P. Fan,K. Yang,H. Cai
Using polypyrrole (PPy)-coated agricultural corn straw (CS) as support frameworks, polyethylene glycol (PEG) as phase change components, a shape-stable phase change thermal storage composite (CS@PPy-PEG x ) was obtained by simple crosslinking, melt-blending, and freeze-drying processes. With the help of potential non-covalent interactions among each component (e.g., hydrogen bonding), the encapsulation of PEG in these composites reached as high as 90 wt%, and displayed-enhanced thermal conductivities (a maximum of ∼0.22 W/(m·K)), thermal reliabilities and stabilities (with no obvious shape deformation after 100 heating and cooling cycles), promising thermal storage capacities (with max latent melting heat of ∼145.80 J/g and crystallization heat of ∼141.50 J/g), as well as conducive leakage resistance . Thus, this study paved a green and feasible strategy to convert agricultural straw residues into shape-stable and high-performance phase change composites that demonstrated great potential in the field of building thermal energy storage.
✓ 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）