JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Wenjing Yu,Gaofeng Shao
Graphene with abundant defects has been considered as the most lightweight electromagnetic functional materials . Although important, the dominant electromagnetic response of defective graphene with diverse morphologies is rarely the focus of existing research. Herein, the defective graphene with two-dimensional planar structure (2D-ps) and three-dimensional continuous network (3D-cn) morphologies were dexterously designed with 2D mixing and 3D filled systems of polymeric matrix. A comparison between the topologies of defective graphene-based nanofillers and the microwave attenuation behaviors was examined. Defective graphene with 3D-cn morphology can achieve ultralow filling content and broadband absorption, which is attributed to the presence of numerous pore structures that promote impedance matching, induce continuous conduction loss and provide multiple reflection and scattering sites for electromagnetic wave attenuation. Comparatively, by virtue of the increased filling content of 2D-ps, the dielectric losses primarily originate from the dielectric genes, including aggregation-induced-charge transport, abundant defect and dipole polarization, resulting in good microwave absorption at low thickness and low frequency. Therefore, this work provides a pioneering insight into morphology engineering of defective graphene microwave absorbers, and it will guide future exploration of customizing high-performance microwave absorption materials based on graphene-based low-dimensional building blocks.
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CARBOHYDRATE POLYMERS
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2023
·
IF 11.2
Qinglu Li,Ruihua Tang,Hao Zhou,Xuxu Hu,Sufeng Zhang
With the development and popularity of portable electronic devices, there is an urgent need for flexible energy storage devices suitable for mass production. We report freestanding paper electrodes for supercapacitors fabricated via a simple but efficient two-step method. Nitrogen-doped graphene (N-rGO) was first prepared via a hydrothermal method . This not only obtained nitrogen atom-doped nanoparticles but also formed reduced graphene oxide . Pyrrole (Py) was then deposited on the bacterial cellulose (BC) fibers as a polypyrrole (PPy) pseudo-capacitance conductive layer by in situ polymerization and filtered with nitrogen-doped graphene to prepare a self-standing flexible paper electrode with a controllable thickness. The synthesized BC/PPy/N 15 -rGO paper electrode has a remarkable mass specific capacitance of 441.9 F g −1 , a long cycle life (96 % retention after 3000 cycles), and excellent rate performance. The BC/PPy/N 15 -rGO-based symmetric supercapacitor shows a high volumetric specific capacitance of 244 F cm −3 and a max energy density of 67.9 mWh cm −3 with a power density of 1.48 W cm −3 , suggesting that they will be promising materials for flexible supercapacitors.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 14
·7711-7723
·
IF 11.9
Min Wang,Xuezhong Zhang,Chuanliang Chen,Yong Wen,Qichao Wen,Qiang Fu,Hua Deng
Solar-powered interfacial water evaporation is thought as a promising strategy for clean water production to tackle global water pollution and scarcity. Nevertheless, the water evaporation rate under all-weather conditions still needs to be improved. Herein, we report an effective approach to develop an integrated photo-electro-thermal steam generation system consisting of aramid-based aerogels that illustrate high evaporation rate under 1 sun (1 kW m−2) illumination and can also carry out water evaporation effectively in low-light or dark environments. The porous aerogel evaporators with high conductivity are composed of aramid nanofibers (ANFs) and carbon nanotubes (CNTs) coated with in situ synthesized polypyrrole (PPy). Based on the photo-thermal effect and electro-thermal effect simultaneously, the evaporators ensure efficient all-weather water production. The evaporation rate of the photo-electro-thermal system reaches 4.71 kg m−2 h−1 with 1 sun radiation and an input voltage of 5 V, while the rate is 2.81 kg m−2 h−1 under only 1 sun illumination. Meanwhile, the system also shows promising potential in salt tolerance and dye wastewater treatment.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
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IF 11.4
Ruimeng Wang,Xinqi Luan,Muhammad Yaseen,Jingyu Bao,Jing Li,Zhongxing Zhao,Zhenxia Zhao
High-capacity adsorption and removal of complex volatile organic compounds (VOCs) from real-world environments is a tough challenge for researchers. Herein, a swellable array adsorption strategy was proposed to realize the synergistic adsorption of toluene and formaldehyde on the flexible double hypercross-linked polymers (FD-HCPs). FD-HCPs exhibited multiple adsorption sites awarded by a hydrophobic benzene ring/pyrrole ring and a hydrophilic hydroxyl structural unit. The array benzene ring, hydroxyl, and pyrrole N sites in FD-HCPs effectively captured toluene and formaldehyde molecules through π–π conjugation and electrostatic interaction and weakened their mutual competitive adsorption. Interestingly, the strong binding force of toluene molecules to the skeleton deformed the pore structure of FD-HCPs and generated new adsorption microenvironments for the other adsorbate. This behavior significantly improved the adsorption capacity of FD-HCPs for toluene and formaldehyde by 20% under multiple VOCs. Moreover, the pyrrole group in FD-HCPs greatly hindered H2O molecule diffusion in the pore, thus efficiently weakening the competitive adsorption of H2O toward VOCs. These fascinating properties enabled FD-HCPs to achieve synergistic adsorption for multicomponent VOC vapor under a highly humid environment and overcame single-species VOC adsorption properties on state-of-the-art porous adsorbents. This work provides the practical feasibility of synergistic adsorption to remove complex VOCs in real-world environments.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Tao Yu,Yiting Che,Hao Fu,Dingfeng Ma,Wenjia Zhao,Shitan Yan,Ting Bian,Liuting Zhang
The innovative design of highly active and noble-metal-free electrocatalysts for the oxygen reduction reaction (ORR) is urgently required for the widespread application of Zinc-air batteries (ZABs). This study presents a porous composite, Co 9 S 8 @NSC, which integrates N and S co-doped carbon aerogels with Co 9 S 8 nanoparticles to create ideal ORR electrocatalysts. The porous carbon aerogels posesess a high specific surface area, which offers abundant catalytic sites and efficient channels for the reactants and electrolytes, while maintaining a uniform distribution of nanoparticles during long-term operation. The collaboration of ORR-active Co 9 S 8 nanoparticles and N and S co-doped carbon aerogels significantly improves ORR performance. Co 9 S 8 @NSC demonstrates a competitive ORR activity, including a high half-wave potential (E 1/2 , 0.85 V), fast electron transfer kinetics (Tafel slop, 53.3 mV dec −1 ), and prominent long-term stability. When utilized as an air cathode catalyst in primary Zn-air batteries, the Co 9 S 8 @NSC electrode displays a power density of 150.9 mW cm −2 and a specific capacity of 735 mAh g zn −1 . Overall, this work presents a promising electrocatalyst design for ORR, which could greatly benefit the development of ZABs.
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Micromachines
·
2023
·Vol. 14
·期 4
·855
·
IF 3.4
Weizhuo Gao,Weixuan Jing,Yanrui Du,Zehao Li,Pengcheng Liu,Feng Han,Libo Zhao,Zhaochu Yang,Zhuangde Jiang
With polymerization duration and Au3+concentration of the electrolyte regulated, a desirable nitrate-doped polypyrrole ion-selective membrane (PPy(NO3−)-ISM) and Au solid contact layer of anticipate surface morphology were obtained, and the performance of nitrate all-solid ion-selective electrodes (NS ISEs) was improved. It was found that the roughest PPy(NO3−)-ISM remarkably increases the actual contact surface area of the PPy(NO3−)-ISMs with nitrate solution, which leads to better adsorption of NO3−ions upon the PPy(NO3−)-ISMs, and produces a larger number of electrons. The most hydrophobic Au solid contact layer avoids the formation of the aqueous layer at the interface between the PPy(NO3−)-ISM and Au solid contact layer, and ensures unimpeded transporting of the produced electrons. The PPy-Au-NS ISE for polymerization duration 1800 s and at Au3+concentration 2.5 mM of the electrolyte displays an optimal nitrate potential response, including a Nernstian slope of 54.0 mV/dec, LOD of 1.1 × 10−4M, rapid average response time less than 1.9 s, and long-term stability of more than 5 weeks. This indicates that the PPy-Au-NS ISE is an effective working electrode for the electrochemical determination of NO3−concentration.
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BIOCONJUGATE CHEMISTRY
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2023
·
IF 4.7
Yulin Jiang,Juehan Wang,Ruibang Wu,Lin Qi,Leizheng Huang,Jing Wang,Meixuan Du,Zheng Liu,Yubao Li,Limin Liu,Ganjun Feng,Li Zhang
Inspired by the negative Poisson’s ratio (NPR) effects of the annulus fibrosus (AF) in intervertebral discs (IVDs), we designed a re-entrant honeycomb model and then 3D printed it into a poly(ε-caprolactone) (PCL) scaffold with NPR effects, which was followed by in situ polymerization of polypyrrole (PPy), thus constructing a PPy-coated NPR-structured PCL scaffold (−vPCL-PPy) to be used as the AF implant for the treatment of lumbar herniated discs. Mechanical testing and finite element (FE) simulation indicated that the NPR composite implant could sustain axial spine loading and resist nucleus pulposus (NP) swelling while displaying uniform stress diffusion under NP swelling and contraction. More interestingly, the NPR-structured composite scaffold could also apply a reacting force to restrain NP herniation owing to the NPR effect. In addition, the in vitro biological assessment and in vivo implantation demonstrated that the NPR composite scaffold exhibited good biocompatibility and exerted the ability to restore the physiological function of the disc segments.
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International Journal of Smart and Nano Materials
·
2023
·
IF 3.9
Bingkun Tian,Xiaofeng Jiang,Weicun Chu,Chunxiao Zheng,Wanlin Guo,Zhuhua Zhang
Developing high-performance nanostructured materials is key to deliver the potential of hydrovoltaic technology into practical applications. As single-component materials have approached its limit in generating hydrovoltaic electricity, the development of multi-component hydrovoltaic materials has been necessary in continuously boosting the electricity output. Here, we report a hydrovoltaic material by integrating reduced graphene oxides and polypyrrole nanoparticles (rGO/PPy), where the rGO contributes improved conductivity and large specific surface area while PPy nanoparticles enable enhanced interaction with water. The device fabricated with this material generates a short-circuit current of 6 μA as well as a maximum power density of over 1 μW/cm3 from natural evaporation of water. And the substantial ion–PPy interaction enables robust voltage generation from evaporation of various salt solutions. Moreover, an outstanding scaling ability is demonstrated by connecting 10 devices in series that generate a sustainable voltage of up to ~2.5 V, sufficing to power many commercial devices, e.g. LED bulb and LCD screen
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
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IF 4.5
Huaiyu Li,Chenxi Xu,Wei Wang,Gangyong Li,Junlin Huang,Liang Chen,Zhaohui Hou
The development of single atom catalysts is considered as a hotspot in the field of electrocatalysis. As the representative of single atom catalysts, metal and nitrogen co–doped carbon (M N C) attracts worldwide attentions due to its great potential in the application of oxygen reduction reaction (ORR). However, the actual preparation of M N C still confronts with tedious procedure, harsh condition and relatively low loading of single metal atom. In this work, we successfully prepare high–loading 3D Co N C architecture by a facile oxidation polymerization followed by pyrolysis process employing 3D nitrogen–doped graphene hydrogel (NGH) and pyrrole (PY) as the reaction precursors. Benefitting from the individual advantages of 3D NGH and PY, the resultant 3D Co N C possesses unique 3D architecture, high–loading single Co atom (2.74 wt%), large specific surface area and enriched mesopores, which benefit the exposure of sufficient catalytic sites and facilitate electrons transfer and ions transport, thus generating much enhanced ORR performance. When used as the cathode catalyst for zinc–air batteries (ZABs), it shows comparable performance with commercial Pt/C catalyst. Clearly, our finding offers a good guidance on the design and synthesis of advanced high–loading single atom catalysts.
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Small
·
2023
·Vol. 19
·期 21
·2300233
·
IF 13.3
Tian Li,Jinzhe Li,Zhengkan Xu,YingRui Tian,Jiatong Li,Jiani Du,Fanbin Meng
Nowadays, the rapidly development of advanced antidetection technology raises stringent requirements for microwave absorption materials (MAMs) to focus more attention on wider bandwidth, thinner thickness, and lower density. Adding magnetic medium to realize broadband absorption may usually result in the decline of service performance and accelerating corrosion of MAMs. Chiral MAMs can produce extra magnetic loss without adding magnetic medium due to the unique electromagnetic cross polarization effect. However, more efforts should be taken to furtherly promote efficient bandwidth of chiral MAMs and reveal attenuation mode and modulation method of chiral structure. Herein, a novel superhelical nano-microstructure based on chiral polyaniline and helical polypyrrole is successfully achieved via in situ polymerization strategy. The enhanced multiscale-chiral synergistic effect contributes to broaden effective absorption bandwidth, covering 8.6 GHz at the thickness of 3.6 mm, and the minimum reflection loss can reach −51.3 dB simultaneously. Besides, to further explain response modes and loss mechanism of superhelical nano-microstructures, the electromagnetic simulation and test analysis are applied together to reveal their synergistic enhancement attenuation mechanism. Taken together, this strategy gives a new thought of how to design, prepare, and optimize the hierarchical structure materials to achieving broadband and high-performance microwave absorption.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Wei Luo,Kai Qi,Yubing Qiu,Xingpeng Guo
A polypyrrole/zinc (PPy/Zn) bilayer coating is prepared to significantly improve the corrosion resistance of ZK60 magnesium alloy in 37 °C Hank's solution to meet the requirements for biodegradable metals. The zinc coating composed of dense and uniform flake-like zinc crystals displays good abrasion resistance and adhesion strength , acting as a vital intermediate layer for growing the PPy film doping with tartrate anions (TA − ). The prepared PPy/TA films (10, 20 and 28 μm) on the Zn coating are compact and have high stability in Hank's solution. The electrochemical and hydrogen evolution tests for PPy/Zn/ZK60 specimens show that the PPy/TA film's stability determines the protective performance of PPy/Zn coating in a long immersion period. The PPy(20 μm)/Zn coating has the longest protection time (40 ± 4 days), and too thick PPy film (28 μm) damages its structure to accelerate breakage, developing local corrosion quickly on ZK60. The corrosion mechanism involved is discussed.
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Nanomaterials
·
2023
·Vol. 13
·期 5
·865
·
IF 5.3
Yinbo Wu,Yaowei Feng,Xiulian Qiu,Fengming Ren,Jian Cen,Qingdian Chong,Ye Tian,Wei Yang
Lithium-sulfur batteries with high theoretical energy density and cheap cost can meet people’s need for efficient energy storage, and have become a focus of the research on lithium-ion batteries. However, owing to their poor conductivity and “shuttle effect”, lithium-sulfur batteries are difficult to commercialize. In order to solve this problem, herein a polyhedral hollow structure of cobalt selenide (CoSe2) was synthesized by a simple one-step carbonization and selenization method using metal-organic bone MOFs (ZIF-67) as template and precursor. CoSe2is coated with conductive polymer polypyrrole (PPy) to settle the matter of poor electroconductibility of the composite and limit the outflow of polysulfide compounds. The prepared CoSe2@PPy-S composite cathode shows reversible capacities of 341 mAh g−1at 3 C, and good cycle stability with a small capacity attenuation rate of 0.072% per cycle. The structure of CoSe2can have certain adsorption and conversion effects on polysulfide compounds, increase the conductivity after coating PPy, and further enhance the electrochemical property of lithium-sulfur cathode material.Keywords:lithium-sulfur battery;transition metal selenides;metal-organic framework;polypyrrole;sulfur host
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