SURFACE ENGINEERING
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2020
·
IF 2.433
Hongchao Wang,Shicheng Wang,Yiyi Li,Meng Li,Yiting Xu,Kaibin He,Conghui Yuan,Birong Zeng,Lizong Dai
Polyaniline/graphene oxide (GON-An) composites were synthesized by chemically grafting p-phenylenediamine (PPDA)-modified graphene oxide (GO) with polyaniline (PANI), which was confirmed by FT-IR, XRD, SEM, TEM, Raman spectroscopy, and XPS analyses. The electrochemical impedance spectroscopy test, brine immersion, and Tafel slopes analysis revealed that compared with GO and PPDA-modified GO (GON), GON-An composites which combined the unique corrosion resistance of both PANI and GO exhibited relatively obvious superiority in improving the corrosion resistance of epoxy coating with the same contents. After being immersed in brine for 35 days, the composite epoxy coating containing 1 wt-% of GON-An(1:2) composites in which the mass ratio of GO and PANI was 1:2, possessed a high impedance of 4×109 Ω cm2, a high corrosion potential of −0.25 V, and a low corrosion current of 4.119×10−11 A cm−2. Furthermore, the anti-corrosive mechanisms of PANI/GO epoxy coatings were discussed.
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Molecular Catalysis
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2020
·
IF 3.687
Shilin Nie,Huafan Li,Jingru Qin,Yansu Wang,Libo Niu,Ligong Chen,Guoyi Bai
Several Ni/Montmorillonite (MMT) catalysts were prepared and evaluated in the hydrogenation of dioctyl phthalate to di(2-ethylhexyl) hexahydro-phthalate, an environmentally friendly plasticizer. Notably, a Ni/MMT-AE catalyst, which was prepared by the ammonia evaporation method, showed excellent activity and stability. It could be steadily used ten times under harsh reaction conditions, comparable to most of the noble metal catalysts. TEM results revealed that the active nickel species were highly dispersed on the surface of the MMT support with average particle sizes of 4.1 nm in the Ni/MMT-AE catalyst, resulting in its high activity. XPS and TPR results demonstrated the strong interaction between nickel and the MMT support, which could effectively inhibit the agglomeration and loss of the active nickel species during the reaction, accounting for its outstanding stability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Yiyi Liu,Peiman Xu,Zhifeng Ye,Tianlun Cen,Xiaomin Peng,Dingsheng Yuan,Haiyan Wu
Transition metal oxides , as newly earth-abundant and low-cost catalysts, have been regarded as promising materials for electrocatalytic oxygen evolution. However, they are rarely used as an electrocatalyst in hydrogen evolution reaction (HER) due to the poor HER activity. Herein, we present a facile two-step method to synthesize P doped CoMoO 4 /RGO (P-CoMoO 4 /RGO) with different atomic ratios of Co 2+ /Co 3+ through a simple phosphorization strategy by changing the mass of NaH 2 PO 2 . The effective P-doping into CoMoO 4 /RGO can modify the electronic properties and modulate the atomic ratio of Co 2+ /Co 3+ , which promotes the electron transfer and creates more activity sites. Therefore, the optimized P-CoMoO 4 /RGO with a relatively larger atomic ratio of Co 2+ /Co 3+ shows superior HER performances in alkaline media , which affords a current density of 10 mA cm −2 at a small overpotential of 90 mV and a low Tafel slope of 62 mV dec −1 along with having satisfactory long-term stability. This work provides a valuable route to enhance the HER activity of transition metal oxides.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Biaobiao Ma,Shiyong Sun,Huichao He,Rui Lv,Jianjun Deng,Tingting Huo,Yulian Zhao,Haili Yu,Lei Zhou
Photocatalysis is a green and sustainable technique for converting solar energy into energy-storage molecules. A novel type of metal-free photocatalyst consisting of polydopamine (PDA) surface-functionalized graphitic carbon nitride (g-C3N4) was fabricated to enable the highly efficient visible-light-driven photocatalytic production of reduced nicotinamide adenine dinucleotide (NADH) through the photomediated reduction of NAD+. The photocatalytic performance and kinetic processes were investigated to evaluate the efficiency of NADH regeneration by the PDA/g-C3N4 photocatalysts. It was shown that the PDA layer thus formed could promote the charge carrier transfer of g-C3N4 to increase the solar-to-chemical conversion efficiency under visible light irradiation. A photocurrent density three times higher than that of pristine g-C3N4 was obtained. The photocatalytic activity of the PDA/g-C3N4 photocatalysts appeared to be dependent on the pH, with an increase in the pH from 3.0 to 9.5 substantially enhanced the NADH yield. The 20 wt % PDA/g-C3N4 exhibited remarkably improved photocatalytic NADH regeneration efficiency, achieving an NADH yield of 94.7% with an initial reaction rate of 2.4 mmol·h–1·g–1, which is approximately six times higher than that of pristine g-C3N4. Our study thus identifies a promising photocatalyst for enhancing the photocatalytic efficiency for nicotinamide cofactor regeneration.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 16
·48594
·
IF 2.188
Rui Wang,Yao Xiao
In this study, we prepared monosultap microcapsules in an inverse emulsion through interfacial polymerization for the first time. The microcapsules are spherical pellets with intact and smooth shell and have a narrow particle size distribution with an average size of about 2.35 μm. More importantly, our microcapsules have excellent thermal stability with a starting decomposition temperature of 233.1 °C, high encapsulation efficiency of 81.9% as well as long-term slow release of monosultap under different conditions. In addition, the shell of the microcapsules can degrade completely in the natural condition, avoiding the pollution to the environment. It can be believed that our microcapsules will show good service performance if employed in agricultural industry. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48594.
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ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Qiuli Cheng,Xiaowei Guo,Xiaojuan Hao,Zuosen Shi,Song Zhu,Zhanchen Cui
Antibacterial coatings have drawn much attention because of their high potential applications in medicine. However, the weak mechanical property, poor biosafety, and biocompatibility of most established antibacterial coatings restrict their applications. In this study, robust antibacterial coatings were fabricated via a simple organic–inorganic hybrid method. The polymer component provides an excellent antibacterial property to the coatings, and the hybrid silica sol improves the hardness of coatings. After cross-linking, network-structured coatings were formed. The coating surfaces exhibited high transmittance, excellent mechanical property, and good antibacterial effect against Escherichia coli (Gram-negative) and Streptococcus mutans (Gram-positive). Additionally, the robust coatings were noncytotoxic with satisfactory biocompatibility. Such results provide a theoretical basis for their applications in the biomedical field.
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PubMed
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2019
·
IF 0.67
He Li,Yijun Zhang,Dinghua Liu,Xiaoqin Liu
2,4-Dichlorophenylacetic acid is synthesized in high yield via the carbonylation of 2,4-dichlorobenzyl chloride, and various experimental conditions are evaluated. Xylene, bistriphenylphosphine palladium dichloride, tetraethylammonium chloride and sodium hydroxide in solution are added to the reaction system and held at 80 °C under a CO atmosphere. 2,4-Dichlorophenylacetic acid is obtained in a maximum yield of 95%, and a mechanism for 2,4-dichlorobenzyl chloride carbonylation is proposed. The reaction system provides a mild, effective and novel means by which to prepare phenylacetic acid derivatives from their corresponding benzyl chloride derivatives.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2022
·Vol. 48
·期 2
·e202200239
·
IF 2.134
Xiang Zhang,Zhenggang Xiao
Nitrocellulose-based combustible cartridge case (NC-3C) is highly hygroscopic, which greatly limits its broader application. The effective strategy for NC-3Cs to prevent moisture is the endowment of waterproof coatings. However, the traditional waterproof coatings for NC-3Cs cannot self-heal the inevitable mechanical microcracks suffered during handling and storage, which often gives moisture much more opportunities to destroy the internals. Therefore, it is necessary to develop a self-healing waterproof coating for the protection of NC-3Cs. Herein, a smart self-healing silicone polyurea (SPU) elastomer based on dynamic reversible hydrogen bonds is designed as a waterproof coating for NC-3Cs. The SPU elastomer shows an outstanding self-healing efficiency of 99.06 % after 12-hour self-healing at room temperature. And it also can self-heal its damages even when the ambient temperatures rise to 50 °C or drop to −18 °C. Moreover, the SPU-coated NC-3C can also self-heal its microcracks in time after being scratched and obtains extremely low water absorptions (<0.20 %) after 24-hour soaking, exhibiting good waterproof performance. Endowing the waterproof coating with self-healing ability is a promising design strategy to repair the coating microcracks and improve the environmental adaptability of NC-3C during handling and storage. This work pioneers a new design of self-healing waterproof coating for NC-3Cs, and it has a positive guiding significance to expend broader application of NC-3C.
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BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
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2022
·
IF 4.117
Yushuang Hou,Shuyang Tu,Xiaohuan Zhao,Guangyi Li,Na Li,Aihua Zou
Background Nanoplastics in the environment can enter the human body through gastrointestinal intake, dermal contact, and pulmonary inhalation, posing a threat to human health. Protein molecules in body fluids will quickly adsorb on the surfaces of the nanoplastics, forming a protein corona, which has implications for the interaction of the nanoplastics with cells and the metabolic pathways of the nanoplastic within cells. For years, practical tools such as dynamic light scattering, transmission electron microscopy, and liquid chromatography have been developed to understand the protein corona of nanoparticles (NPs), either in vitro or in cellular or molecular level. However, an integrated approach to understand the nanoparticles-protein corona is still lacking. Methods Using the most frequently observed environmental nanoplastics, polystyrene nanoplastics (PS), as a standard, we established an integrative structural characterization platform, a biophysical and biochemical evaluation method to investigate the effect of surface charge on protein corona composition. The cellular and molecular mechanisms were also explored through in vitro cellular experiments . Results The first integrative method for characterizing biological properties of NPs-protein corona has been established. This method comprehensively covers the critical aspects to understand NPs-protein corona interactions, from structure to function. Conclusions The integrative method for nanoplastics microstructure characterization can be applied to the structural characterization of nanoparticles in nanoscale, which is of universal significance from in vitro characterization to cellular experiments and then to molecular mechanism studies. General significance This strategy has high reliability and repeatability and can be applied both in environment and nanomedicine safety assessment.
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PubMed
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Advanced Energy Materials
·
2022
·Vol. 12
·期 47
·2202634
·
IF 29.698
Xulei Lu,Tingting Yang,Chunqiao Fu,Zhongbao Jiang,Yong Zhang,Kedong Shang,Changliu He,Jian Zhou,Qi-Chang He
Harvesting electrical energy from different forms of water by using the hydrovoltaic effect is a promising approach to green energy acquisition. However, at present, different devices are required to obtain electrical energy from different water forms, and the output performance of the devices is not high, which greatly reduces the convenience and effectiveness of harvesting electrical energy from different water forms. Here, a carbon nanofiber electrode with a hierarchical porous structure capable of promoting water molecule adsorption, rapid penetration, and diffusion is reported. Besides, the electrode acts as a nanofluidic diode with anodic aluminum oxide in which the built-in electric field drives selective separation and directional transport of ions and efficient ion/electron current conversion at the electrodes. Unlike typical hygroelectric devices, the device can work with moisture (93% relative humidity, 25 °C, open-circuit voltage ( V OC ) ≈ 1.1 V, short-circuit current density ( J SC ) ≈ 27 µA cm −2 ), water droplets (2 µL, V OC ≈ 1.03 V, J SC ≈ 640 µA cm −2 ), and bulk water ( V OC ≈ 1.15 V, J SC ≈ 256 µA cm −2 ). It provides an efficient way to generate electricity in multiform water environment, greatly broadening the working scene and improving the adaptability of the device in complex weather environments.
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Chem
·
2022
·
IF 25.832
Ping Xiong,Sangshan Peng,Leyuan Zhang,Aimin Li,Yuyue Chen,Sisi Xiao,Qing He,Guihua Yu
Summary A well-defined hydrophilic/hydrophobic nanophase-separated structure is widely applied for the construction of fast ion-transport pathways in polymeric membranes for energy-related applications such as electrochemical reactors, fuel cells, and redox flow batteries (RFBs). Conventional nanophase separation is induced by covalently grafted side chains, which however complicate membrane preparation and potentially reduce the chemical stability of membranes. In this work, we report a pseudo-nanophase-separation strategy enabled by supramolecular interactions to construct fast and selective ion-transport channels in polymeric membranes. The “side chains” are “grafted” onto the polymer backbone via supramolecular interactions instead of covalent bonds, simplifying the membrane preparation process and simultaneously protecting the polymer backbone from chemical degradation, which is a critical problem usually found in membranes with molecular modifications. The pseudo-nanophase separation enables high-performance membranes for aqueous acidic RFBs, showing high efficiency and good cycling stability, which suggests its potential to design highly conductive and chemically stable membranes for various energy-related devices.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tangjie Yu,Zhu Ma,Zhangfeng Huang,Yanlin Li,Junjie Tan,Guoming Li,Shanyue Hou,Zhuowei Du,Zichen Liu,Yixian Li,Hao Du,Qian Zhang,Junbo Yang,Wei You,Yi Chen,Qiang Yang,Jian Yu,Yuelong Huang,Yaohua Mai,Long Wei
Defect passivation of the perovskite surface and grain boundary (GBs) has become a widely adopted approach to reduce charge recombination. Research has demonstrated that functional groups with Lewis acid or base properties can successfully neutralize trap states and limit nonradiative recombination. Unlike traditional Lewis acid–base organic molecules that only bind to a single anionic or cationic defect, zwitterions can passivate both anionic and cationic defects simultaneously. In this work, zwitterions organic halide salt 1-amino pyridine iodine (AmPyI) is used as a perovskite for defect passivation. It is found that a pair of amino lone electrons in AmPyI can passivate defects surface and GBs through hydrogen bonding with perovskite, and the introduced I– can bind to uncoordinated Pb2+ while also controlling the surface morphology of the film and improving the crystallinity. In the presence of the AmPyI additive, we obtained about 1.24 μm of amplified perovskite grains and achieved an efficiency of 23.80% with minimal hysteresis.
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