CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Xinpeng Che,Meiyan Wu,Guang Yu,Chao Liu,Huanfei Xu,Bin Li,Chaoxu Li
Flexible actuators with responses to various environmental stimuli have attracted great attention, but the issues of weak layer-to-layer bonding and low water resistance of cellulose-based actuators severely restrict their practical application. Herein, inspired by the internal structure of lignocellulose and reversible opening movement of pine cones by external humidity stimuli, a novel Janus film consisting of the insulated lignin-containing cellulose nanopaper (CNP) layer and the conductive reduced graphene oxide (rGO) layer was delicately designed and well fabricated through lignin adhesion between the two layers. Characterization showed that the obtained Janus film with a tensile strength of 141 MPa could be used as a flexible actuator, which could be operated based on water absorption and dehydration of the CNP layer as well as the light-to-heat conversion and high conductivity of rGO layer. Thus, the as-fabricated Janus film with excellent durability (folding resistance (>1000 times), good wet stability, and durable electrical actuation (>500 cycles)) had quick multi-responses to humidity, near-infrared radiation and electrical stimulation. Particularly, the resultant Janus film had the fastest response speed (1.875°/s/V) under the electrical stimuli compared to the reported carbon/polymer-based flexible actuators with comparable weights. Therefore, this CNP-based Janus film can be potentially used in many fields such as humidity sensor, bionic artificial arm/driving motor, and it could be helpful to develop facile and environmentally friendly strategies for the construction of multi-responsive Janus actuator/intelligent devices.
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高影响因子
Materials
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2021
·Vol. 15
·期 1
·62
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IF 3.623
Ying Liu,Gengyuan Gao,Dan Jiang,Zhongwei Yin
This paper studied a hybrid polytetrafluoroethylene (PTFE)/Nomex fabric composite with lower friction coefficient (COF) and high underwater wear resistance. A pin-on-disk tribometer was used to test tribological properties under different applied loads and rotation speeds. The wear surface, transfer film and cross-section were analyzed by scanning electron microscope (SEM) and optical microscope. The results showed enhanced underwater tribological properties because of excellent self-lubricating properties of PTFE fibers and a good lubricating effect and load-carrying capacity of graphite fillers. Improved underwater mechanical strength was connected to the high strength of epoxy resin and high bonding force between Nomex and epoxy resin.Keywords:fabric composite;epoxy;graphite;friction and wear;water-lubricated
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高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Ruijun Bai,Miaoxin Zhang,Xin Zhang,Shijing Zhao,Weifeng Chen,Ning Chen,Puguang Ji,Mirtemir Sh Kurbanov,Hua Wang,Huiyang Gou,Gongkai Wang
Transparent flexible supercapacitors (TFSCs) are a tantalizing power supplier for future transparent flexible electronics. However, their energy density is far behind a practical level while maintaining high transparency. We report here a transparent flexible potassium-ion microcapacitor, and its high energy density (15.5 μWh cm–2) roots in the battery-supercapacitor hybrid storage mechanism and much enlarged working voltage (3 V), outperforming the state-of-the-art TFSC, which is generally based on an aqueous electrolyte and an asymmetric pseudocapacitive mechanism. From an electrode material perspective, a multidimensional topotactic host composite anode is designed in which the component not only performs energy storage by synchronous and reversible uptake of potassium ions and electrons into its host structure, but also mutually compensates individual weakness in functional and structural aspects, efficiently constructing a three-dimensional potassium-ion diffusion and electron transport system. This conceptual exhibition provides design principles at material and device levels for high-performance TFSCs.
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高影响因子
Advanced Materials Interfaces
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2021
·Vol. 9
·期 4
·2101705
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IF 6.147
Wancong Leng,Leilei Cui,Yang Liu,Yun Gong
By annealing [Mn(phen)H 2 O][V 2 O 6 ] (phen = 1,10-phenanthroline) in the presence of graphite template, MnV 2 O 4 /C microparticles are obtained, in which MnV 2 O 4 particles with one-layer or few-layer coating of graphene are anchored on the graphite sheets. The optimal sample, MnV 2 O 4 (p)/C-700 with a high carbon content (35.3 at. %) can deliver a large specific capacity of 410 mAh g −1 at 0.1 A g −1 with a high capacity retention of 94.3% over 1000 discharge/charge cycles at 20 A g −1 as cathode in zinc-ion battery. Ex situ X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectra, as well as elemental mappings and X-ray photoelectron spectroscopy of MnV 2 O 4 (p)/C-700 discern the partial phase transformation mechanism of MnV 2 O 4 →Zn 3 (OH) 2 V 2 O 7 (H 2 O) 2 during discharge/charge process. It is because the rich oxygen defects of MnV 2 O 4 can improve electrical conductivity, favor the electron transfer from V→Mn/O, thus facilitate the binding of Zn 2+ , and the captured Zn 2+ cannot be extracted, as evidenced by density functional theory calculations. Furthermore, it is found that O-deficiency can capture the water shell from the hydrated Zn 2+ , then the dehydrated Zn 2+ is easy to insert into MnV 2 O 4 with lower migration barrier of Zn 2+ (0.84 eV), leading to the structural reversibility of MnV 2 O 4 in cycling test.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Jiaxin Wang,Lili Ma,Jinmei He,Yali Yao,Xuedan Zhu,Lei Peng,Jie Yang,Kanshe Li,Mengnan Qu
The triboelectric nanogenerator (TENG) is a promising renewable energy conversion technology for harvesting various low-frequency mechanical motions in nature, such as human motion and raindrops. However, traditional TENGs still suffer from challenges including poor mechanical stability, low environmental adaptability, and single working mode. Herein, a scalable and flexible hybrid dielectric-based TENG (HD-TENG) based on triboelectric layer with internal micro/nano pores and hierarchical superhydrophobic micro-cilia structure has been developed and designed to effectively harvest energy from various human motions as well as natural environment (raindrops and waves). Working in the single-electrode mode, the HD-TENG demonstrates high output (∼465 V, ∼60 μA, ∼3.2 W m −2 ) and maintains a stable signal output under various deformations, vigorous washing, and high humidity environment. Furthermore, two liquid–solid generators are designed to separately harvest droplet energy and wave energy by bulk effect between placed top electrode and the developed HD-TENG. As a result, the output performance of the generators has been significantly improved through further parameter optimization, and peak power densities reach 215 mW m −2 and 1.3 W m −2 , respectively. Due to the strong adaptability and simple fabrication, the versatile HD-TENG can serve as self-powered devices with energy harvested from various sources in different application scenarios.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2021
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IF 6.064
Duraisami Dhamodharan,Veeman Dhinakaran,Radhika Nagavaram,Pradnya Prabhakar Ghoderao,Hun-Soo Byun,Lixin Wu
Waterborne epoxy (WEP) resins are of great significance as multifunctional properties recently. Nevertheless, their curing process, which involves the formation of numerous micro-pores via water evaporation, has limited applications in the industrial utilizations. In this work, we have synthesized and enhanced the water-dispersible Zirconium phosphate decorated graphene oxide (ZrP@GO) nanocomposites through a one-step preparation method of graphene oxide (GO) sheets decorated with ZrP nanoparticles, and the as-prepared ZrP@GO nanocomposites were introduced as nanofillers for WEP system in order to enhance its multifunctional properties. The as-prepared GO, ZrP, and ZrP@GO hybrids were scrutinized by XRD, XPS, Raman, TGA, and its morphology study were investigated with the assistance of AFM, TEM, and FESEM. The anticorrosive properties were analyzed using natural salt spray tests (NSS). The ZrP@GO mixed WEP coatings exhibit better protection towards corrosion when compared to WEP/GO and WEP/ZrP coatings. Also, the excellent mechanical and thermal properties were achieved with the incorporation of ZrP@GO hybrids with the WEP system. The better performance of ZrP@GO was achieved through enhanced dispersion, exfoliation, and the outstanding shielding effect of the smectic aligned layers of ZrP@GO hybrids. Besides, a finite element model proposed through this research to predict the tensile behaviors are good in agreement with the measured vales.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Dengke Zhao,Shunlian Ning,Xiaolong Yu,Qikai Wu,Wei Zhou,Jiacheng Dan,Yuguang Zhu,Hao Zhu,Nan Wang,Ligui Li
The exploration of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline conditions is an important way to promote the development of electrolytic water technology . Herein, the reduced graphene oxide-supported MoO 4 2- modified amorphous cobalt metaphosphate cubes (a-Co(PO 3 ) 2 /MoO 4 /rGO) as bifunctional OER/HER catalyst is prepared by anion exchange and phosphating, using the Prussian blue analogue (PBA) as a precursor. The resulting composite exhibits the low overpotentials (η) that of 290 and 50 mV for OER and HER in 1.0 M KOH solution at 10 mA cm −2 , respectively. The electrochemical test and density functional theory (DFT) results reveal that the MoO 4 2- -modified optimizes the adsorption/desorption energy of H* of Co(PO 3 ) 2 , thus enhance the HER activity. Benefiting from efficient HER and OER performances, an efficient and stable alkaline water electrolysis operation using a-Co(PO 3 ) 2 /MoO 4 /rGO used as bifunctional catalyst can be carried out, which can deliver a current density (j) of 20 mA cm −2 at 1.65 V cell voltage and work continuously for 24 h.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yu-Hui Jiang,Yu-Qing Zhang,Ce Gao,Qing-Da An,Zuo-Yi Xiao,Shang-Ru Zhai
Superhydrophobic membranes have been playing crucial role in efficient remediation of organic pollutants contaminated water, especially for oily discharged wastewater. Taking advantages of the inherent features of graphene oxide (GO), sodium alginate (SA) and lignin, a novel type of superhydrophobic biopolymer aerogel membrane (T-SA/lignin x /rGO-MTMS) was prepared by freeze-casting technique and subsequent chemical vapor deposition, during which trimethoxymethylsilane (MTMS) silylation growth was achieved for the supreme protuberance, leading to the formation of rough and hydrophobic surface that favorably looks like a hedgehog carrying apples. Due to the air cushion induced by cooperative interaction between rough lignin particles and SA of 3D porous network with gas as a dispersion medium, and crumpled GO nanosheets, as-fabricated membrane with integrated functions of biopolymers possessed superhydrophobic surface characteristics (WCA = 161°). More favorably, utilizing the inherent molecular features, lignin has been successfully employed to de-oxidize GO during this preparative concept. By virtue of the low-surface-energy reduced GO (rGO) and abundant protuberance, T-SA/lignin x /rGO-MTMS exhibited potential cycling performance even with 10 cycles of oil/water separation and oil sorption. This study might shed light on the value-added utilization of integrated functions of biopolymers for designing task-specific functional materials for various applications.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 139
·期 14
·51910
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IF 3.125
Lingyun Wang,Yaxin Chen,Jing Luo,Ren Liu
Graphene derivatives are excellent fillers for providing outstanding barrier performance in organic protective coating but no active inhibition property. In this paper, a facile and environmentally friendly strategy is presented to improve the anticorrosion ability of graphene by modifying graphene oxide (GO) with a green corrosion inhibitor derived from nature, phytic acid (PA). The as-prepared PA modified GO (PAGO) thus possesses the passive barrier property and active corrosion inhibition function simultaneously. Employing PAGO as filler, a high-performance waterborne epoxy composite coating (PAGO/WEP) with “barrier + inhibitor” double anticorrosion effect was fabricated. The EIS test results demonstrated that after 21 days of immersion, the impedance modulus of the PAGO/WEP coating did not decrease and still maintained at the initial impedance value. The salt spray tests also demonstrated the significantly enhanced anticorrosion performance.
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高影响因子
COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Hewei Zhao,Xiaolong Zeng,Tian Zheng,Shaojia Liu,Jie Yang,Rui Hao,Fengshi Li,Lin Guo
High capacity, ultra-fast charge/discharge rate, and long cycling life are external targets for Lithium-ion batteries (LIBs) to satisfy modern energy storage, but it is still challenging to realize them simultaneously. Here, we report a three-dimensional (3D) porous rGO@SnO 2 nanosheets aerogel (rGO@SnO 2 NSA) based on in-situ growing two-dimensional (2D) SnO 2 nanosheets on graphene oxide (GO@SnO 2 NS), subsequent controllable assembly and reduction. The 2D structure of SnO 2 can shorten the electron-transfer path, and the porous architecture of the 3D aerogel endows the aerogels with external ion-transfer channels and exceptional capacitive contribution. As a result, the LIBs using our 3D aerogels as anodes can endure ultrafast charge/discharge (10 A g −1 ) rate and exhibit ultra-long cycling life with a high energy density (512.1 mAh g −1 after 10,000 cycles). For application exploration, the LiFePO 4 /rGO@SnO 2 NSA cell also possesses excellent energy storage performance (364.5 mAh g −1 after 100 cycles). Our electrode design strategy of combining 2D active materials and 3D porous architecture provides a new path to develop next-generation rechargeable energy storage devices.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
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IF 6.901
Niandu Wu,Wenhua Zhao,Boye Zhou,Yizhang Wu,Wentao Hou,Wei Xu,Jun Du,Wei Zhong
Ti 3 C 2 T x (MXene) has intriguing application potential for supercapacitors. However, it usually suffers from self-accumulate and restack, resulting in the decrease of electrochemical active sites and low capacitance. Here, we demonstrated a 3D nitrogen-doped Ti 3 C 2 T x /rGO (NTG) foam which was synthesized through the multistep of gelation assisted with urea, freeze-drying, and thermal treatment processes. The decomposition of urea can not only change the morphology, bringing out more open marco- and microporous structures, but also improve the conductivity due to the nitrogen doping in the matrix. The 3D porous architecture can expose more electrochemical active sites, and thus accelerate the transport/diffusion of electrolyte ions. Consequently, the NTG foam possesses a high specific capacitance of 463 F g −1 , good rate performance, and outstanding cycling stability (90.8% retention after 10 000 cycles) in H 2 SO 4 electrolyte, showing enhanced performance of supercapacitors in comparison with pure Ti 3 C 2 T x and Ti 3 C 2 T x /rGO electrode.
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高影响因子
ACS Applied Bio Materials
·
2021
·
IF 0
Zhilong Wang,Xiaozhu Liao,Xusen Wang,Yan Bai,Haofei Huang,Kuangyu Shen,Luyi Sun,Bin Liu,Zengjie Fan
The exacerbating water pollution and water resource shortage pose a great danger to human health and make it imperative to recycle and treat the sewage. In this study, a direct-writing three-dimensional (3D) printing technology was adopted to prepare a 3D sodium alginate (SA)/graphene oxide (GO)/Ag nanoparticle (AgNP) aerogel (SGA), aiming to turn the complex sewage containing oil, silt, and bacteria into clean water depending only on gravity separation. The physicochemical properties and surface structure of the synthesized SGA were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The swelling rate, mechanical properties, antibacterial properties, oil and water separation effect, and durable stability of the filter membrane were also investigated to verify the versatility of the SGA filter. The results showed that GO helped improve the mechanical properties of the printed filter to withstand water impact during the filtration process. The printed filter had a well-designed and multiscale gradient pore structure, which can effectively intercept particles with different sizes to separate the silt from water, and the turbidity of the filtered water can be reduced from 60 to 1 nephelometric turbidity unit (NTU). The presence of SA endowed the printed filter with hydrophilic and oleophobic behaviors, which can effectively separate various kinds of oils from water. The uniform distribution of AgNPs in the filter produced via a facile and green reduction of SA facilitated the efficient bactericidal ability of the printed filter during the filtration process; meanwhile, the lower release concentration of Ag ions ensured drinking safety. What is more, the filter can be easily produced on a large scale and used for different sewage treatment situations with a durable stability of over 30 days. Taken together, the printed SGA filter has a broad application prospect in complex sewage treatment, providing a special solution for sewage treatment in poverty areas.
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