MOLECULES
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2023
·Vol. 28
·期 11
·4257
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IF 4.6
Qianhui Ma,Guifa Long,Xulei Tang,Xiaobao Li,Xianghui Wang,Chenghang You,Wenjun Fan,Qingqing Wang
The development of highly active and low-cost catalysts for use in oxygen reduction reaction (ORR) is crucial to many advanced and eco-friendly energy techniques. N-doped carbons are promising ORR catalysts. However, their performance is still limited. In this work, a zinc-mediated template synthesis strategy for the development of a highly active ORR catalyst with hierarchical porous structures was presented. The optimal catalyst exhibited high ORR performance in a 0.1 M KOH solution, with a half-wave potential of 0.89 V vs. RHE. Additionally, the catalyst exhibited excellent methanol tolerance and stability. After a 20,000 s continuous operation, no obvious performance decay was observed. When used as the air–electrode catalyst in a zinc–air battery (ZAB), it delivered an outstanding discharging performance, with peak power density and specific capacity as high as 196.3 mW cm−2and 811.5 mAh gZn−1, respectively. Its high performance and stability endow it with potential in practical and commercial applications as a highly active ORR catalyst. Additionally, it is believed that the presented strategy can be applied to the rational design and fabrication of highly active and stable ORR catalysts for use in eco-friendly and future-oriented energy techniques.Keywords:oxygen reduction reaction;highly active and stable catalysts;hierarchical porous structures;N-doped carbons;zinc–air battery
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AQUATIC TOXICOLOGY
·
2023
·
IF 4.5
Qiang Luo,Liping Ai,Shuqiong Tang,Hua Zhang,Jinze Ma,Xiaoping Xiao,Keyuan Zhong,Guiyou Tian,Bo Cheng,Cong Xiong,Xiaobei Chen,Huiqiang Lu
Ethyl 3-(N-butylacetamido) propanoate (EBAAP) is one of the most widely used mosquito repellents worldwide, and is also commonly used to produce cosmetics. Residues have recently been detected in surface and groundwater in many countries, and their potential to harm the environment is unknown. Therefore, more studies are needed to fully assess the toxicity of EBAAP. This is the first investigation into the developmental toxicity and cardiotoxicity of EBAAP on zebrafish embryos. EBAAP was toxic to zebrafish, with a lethal concentration 50 (LC50) of 140 mg/L at 72 hours post fertilization (hpf). EBAAP exposure also reduced body length, slowed the yolk absorption rate, induced spinal curvature and pericardial edema, decreased heart rate, promoted linear lengthening of the heart, and diminished cardiac pumping ability. The expression of heart developmental-related genes ( nkx2.5, myh6, tbx5a, vmhc, gata4, tbx2b ) was dysregulated, intracellular oxidative stress increased significantly, the activities of catalase (CAT) and superoxide dismutase (SOD) decreased, and malondialdehyde (MDA) content increased significantly. The expression of apoptosis-related genes ( bax/bcl2, p53, caspase9, caspase3 ) was significantly upregulated. In conclusion, EBAAP induced abnormal morphology and heart defects during the early stages of zebrafish embryo development by potentially inducing the generation and accumulation of reactive oxygen species (ROS) in vivo and activating the oxidative stress response. These events dysregulate the expression of several genes and activate endogenous apoptosis pathways, eventually leading to developmental disorders and heart defects.
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COMBUSTION AND FLAME
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2023
·
IF 4.4
Yitong Zhai,Qiang Xu,Beibei Feng,Can Shao,Zhandong Wang,S. Mani Sarathy
Low-temperature (low-T) oxidation experiments of n -heptane –with and without NO addition– were experimentally and numerically investigated at stoichiometric conditions in a jet-stirred reactor. Experiments were performed at atmospheric pressure over a temperature range of 500–800 K. Reactants, intermediates, and products, were measured using synchrotron vacuum ultraviolet photoionization mass spectrometry . A detailed kinetic model was developed to gain insight into the chemical effect of NO on low-T oxidation chemistry of n -heptane. Taking 650 K as the transition temperature, the results revealed that NO addition exhibited an inhibiting effect on fuel reactivity below 650 K and a promoting effect above 650 K. The reactions of ROO + NO = RO + NO 2 and HO 2 + NO = OH + NO 2 at different temperature regions were responsible for the inhibition and promotion effects, respectively. Evidence gathered from both experimental measurements and kinetic model predictions indicated that NO addition had a significant inhibitory effect on the formation of cool flame species during the low-T oxidation process. NO suppressed low-T oxidation via the reaction of ROO + NO = RO + NO 2 , which impeded the subsequent isomerization, O 2 addition, OH-, and HO 2 -elimination reaction, and influenced product distribution of the cool flame species. The experimental observations provided detailed information about these reactive intermediates, which offered new insights into low-T oxidation phenomena and clarified the importance of NO reactions which prevent the formation of cool flame products during low-T oxidation.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yu-Jie Lai,Jun-Yang Ji,Hui-Fang Wang,Zheng Niu,Jian-Ping Lang
Adsorption sites play an essential role in gas separation. We introduce N-oxide groups into MOFs to investigate the binding interactions between N-oxide groups and light saturated hydrocarbons for the first time. MOF-808-INO with N-oxide groups shows great performance to separate the mixture of methane, ethane and propane. Remarkably, MOF-808-INO exhibits a very low heat of adsorption of propane, which is important for pre-activation. The cycling experiments reveal that subsequent activation is only required at room temperature with nitrogen purging for several hours, indicating that MOF-808-INO has immense potential applications for recycled materials.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhigang Di,Qifeng Zhao,Hui Xu,Kang Wu,Yan Yan,Xi Jin,Haiying Shen,Yiqian Lv,Boyuan Ran
To improve the anti-corrosion performance and mechanical properties of waterborne epoxy, we synthesized new N-CQDs and introduced them into the coating to prepare N-CQDs/EP. Based on SEM, Micro FT-IR, EIS, NSS, adhesion Tester, and LSCM, the long-term corrosion resistance, mechanical, and fluorescence properties of N-CQDs/EP were studied carefully. The cross-sectional SEM results indicated that N-CQDs could improve the internal cross-linking density and reduce the pore size of N-CQDs/EP. EIS results showed that composite coating could provide excellent anti-corrosion to steel in both 3.5 wt% NaCl solution and simulated seawater. The highest impedance value of N-CQDs/EP was still maintained at 10 9 Ω cm 2 after 30 d immersion. N-CQDs also enhanced the adhesion force, and the highest value was 6.8 MPa. Meanwhile, the N-CQDs/EP fluorescence intensity was increased with the appearance of N-CQDs. Hence, this work can provide theoretical support for developing new epoxy coatings and accelerate the industrial application of long-term coatings.
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RSC Advances
·
2023
·Vol. 13
·期 26
·18090-18098
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IF 3.9
Shun Li,Zhuo Cai,Jiemin Han,Yifei Ma,Zhaomin Tong,Mei Wang,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Demands for highly deformable and responsive intelligent actuators are increasing rapidly. Herein, a photothermal bilayer actuator consisting of a photothermal-responsive composite hydrogel layer and a polydimethylsiloxane (PDMS) layer is presented. The photothermal-responsive composite hydrogel is prepared by compositing hydroxyethyl methacrylate (HEMA) and the photothermal material graphene oxide (GO) with the thermal-responsive hydrogel poly(N-isopropylacrylamide) (PNIPAM). The HEMA improves the transport efficiency of water molecules inside the hydrogel network, eliciting a fast response and large deformation, facilitating greater bending behavior of the bilayer actuator, and improving the mechanical and tensile properties of the hydrogel. Moreover, GO enhances the mechanical properties and the photothermal conversion efficiency of the hydrogel in the thermal environment. This photothermal bilayer actuator can be driven under various conditions, such as hot solution, simulated sunlight, and laser, and can achieve large bending deformation with desirable tensile properties, broadening the application conditions for bilayer actuators, such as artificial muscles, bionic actuators, and soft robotics.
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INORGANIC CHEMISTRY COMMUNICATIONS
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2023
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IF 3.8
Jun Li,Xiangbin Sun,Yaping Zhang,Tingjun Lu,Zeyuan Wang,Yufeng He,Rongmin Wang
Organic dyes pollution (especially methylene blue) in wastewater has seriously affected the livelihood and health of human beings. To address this issue, in this study, loess-based N-doped TiO 2 (NTiO 2 @ALS) photocatalysts were fabricated through in situ deposition of N-doped TiO 2 (NTiO 2 ) nanoparticles on the surface of acidified loess (ALS) particles by sol-gel method. The characterization was performed by XRF, SEM, FT-IR, XRD, XPS, UV–Vis DRS and BET, and small nanoparticles of NTiO 2 were found to be perfectly bound to the surface of the ALS particles. In addition, what factors affecting the photocatalytic activity were explored and it was found that calcination at 450 °C for 2 h was the best condition, under which the samples possessed the highest degradation efficiency under visible light irradiation. Furthermore, NTiO 2 @ALS was applied to the degradation of methylene blue (MB) and the mechanism of pre-adsorption and photocatalytic degradation was also investigated. Surprisingly, methylene blue (MB) could be degraded by 99.6% post pre-adsorption. This excellent result was attributed to the existence of dual coordination between catalytic active center (NTiO 2 ) and support (ALS) in NTiO 2 @ALS. Most significantly, the introduced ALS particles achieved the effective dispersion of small NTiO 2 nanoparticles and increased the specific surface area of materials, which greatly improved photocatalytic performance and adsorption properties. In brief, NTiO 2 @ALS holds promising application potential for the removal and degradation of organic dyes from wastewater.
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Analytical Methods
·
2023
·Vol. 15
·期 27
·3318-3324
·
IF 3.1
Hongyu Chen,Mingshuo Liu,Jianing Wang,Yunfei Wang,Yajuan Wang,Wenyan Liu
Due to their excellent optical and electrical properties, all-inorganic metal halide perovskite CsPbBr3 quantum dots (QDs) have become one of the most promising materials in the field of optoelectronics during recent years. However, the stability of CsPbBr3 QDs limits their practical application and further development to a certain extent. In order to improve their stability, CsPbBr3 QDs were modified with 2-n-octyl-1-dodecanol for the first time in this paper. The 2-n-octyl-1-dodecanol-modified CsPbBr3 QDs were prepared by the ligand-assisted reprecipitation (LARP) method at room temperature in an air environment. Then the stability of the samples was tested at different temperatures and humidity. When the humidity was 80%, the photoluminescence (PL) intensity of both unmodified and modified CsPbBr3 QDs increased to different degrees because the appropriate amount of water changed the crystallization environment. The PL intensity of the modified QDs increased, and the peak positions were basically not shifted, proving that they did not agglomerate. Thermal stability test results showed that the PL intensity of the 2-n-octyl-1-dodecanol-modified QDs could still maintain 65% of the original intensity at 90 °C, which is 4.6 times that of the unmodified CsPbBr3 QDs. Experimental results show that the stability of CsPbBr3 QDs is significantly improved after 2-n-octyl-1-dodecanol modification, which demonstrates the excellent surface passivation of CsPbBr3 QDs by 2-n-octyl-1-dodecanol.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Shaohui Zhang,Suying Liu,Jingwen Huang,Haikun Zhou,Xuanzhi Liu,Pengfei Tan,Haoyun Chen,Yili Liang,Jun Pan
Developing highly efficient and stable platinum-based electrocatalyst for oxygen reduction reaction (ORR) is critical to expediting commercialization of fuel cells. Herein, several PtCu alloy nanocatalysts supported on N, P co-doped carbon (PtCu/NPC) were prepared by microbial-sorption and carbonization-reduction. Among them, PtCu/NPC-700 °C exhibits excellent catalytic performance for ORR with a mass activity of 0.895 A mg Pt −1 (@0.9 V) which is 8.29 folds of commercial Pt/C. Additionally, the ECSA and MA of PtCu/NPC-700 °C only decrease by 14.2% and 18.7% respectively, while Pt/C decreases by 35.2% and 52.8% after 10,000 cycles of ADT test. Moreover, the PtCu/NPC-700 °C catalyst emanates a maximum power density of 715 mW cm −2 and only 11.1% loss of maximum power density after 10,000 ADTs in single-cell test, indicating PtCu/NPC-700 °C also manifests higher activity and durability in actual single-cell operation than Pt/C. This research provides an easy and novel strategy for developing highly active and durable Pt-based alloy catalyst.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
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IF 4.2
Jing-Jing Luo,Ming-Shuai Sun,Boyuan Tang,Yan Zhou,Wen-Ting Chen,Wen-Qiang Gong,Song Han,Fei-Feng Mao,Zhang-Min Li,Duan-Jian Tao
Solvent-controlled hydrogenation of vanillin to 4-hydroxymethyl-2-methoxyphenol (HMP) or 2-methoxy-4-methylphenol (MMP) is an attractive topic in the field of bio-oil utilization. Herein, a nickel-based catalyst supported on a N-doped carbon material (Ni-N-C) was prepared by facile ball milling mixing and subsequent high-temperature calcination. The as-prepared Ni-N-C800 catalyst showed more than 99% MMP yield and good stability using pure H2O as a solvent under the given conditions. By using the mixed solvent H2O/ethyl acetate with a volume ratio of 1:5, the hydrogenation was conveniently tuned to produce the intermediate product HMP. Density functional theory (DFT) calculations further showed that the intermolecular forces of HMP interacting with ethyl acetate were much stronger than those interacting with H2O. Ethyl acetate could raise the energy barrier to keep vanillin hydrogenation in the intermediate HMP stage, and H2O reduced the energy barrier to accelerate the final product MMP formation.
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Analytical Methods
·
2023
·Vol. 15
·期 19
·2376-2381
·
IF 3.1
Lei Jiang,Lin Yuan,Shan Gao,Yingying Xiang,Fei Song,Wensi Ma,Jing Wan,Xiuling Ji,Yujiao Tu
Pesticides are enormously important to industry requirements and in agriculture for improving yields. Parathion is widely used to control pests in vegetables, fruits, and flowers. However, excessive use of parathion poses a threat to food safety, the environment, and human health. Due to low cost, ease to use, and high selectivity and sensitivity, a fluorescent nanoprobe is a candidate for parathion detection. Blue fluorescent carbon dots were prepared by a hydrothermal method with rutinum and o-phenylenediamine as precursors. The Rut-CDs were purified by using dialysis, thin layer chromatography, and a chromatographic column. Excellent linear ranges of 0–7.5 μg L−1 and 12.5–62.5 μg L−1 parathion were obtained with a low detection limit of 0.11 ng mL−1. In addition, the quenching mechanism of parathion to the fluorescence of Rut-CDs was illuminated. Furthermore, the nanoprobe was efficiently applied to determine the parathion content in Chinese cabbage, cantaloupe, and cowpea samples. It shows great potential to detect parathion.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2023
·
IF 5
Yanchao Liu,Yingying Ma,Linying Xue,Wenhao Guan,Yancai Wang
To better address the etiology of lung infections and the delivery limitations that exist, the development of a pulmonary inhalation formulation with antibacterial and mucolytic effects is necessary. This study was conducted using multidrug dry powder in one step to treat pulmonary infections. The optimal ratio of drugs for antibacterial activity was determined by the checkerboard method. The appearance of the dry powder for inhalation was yellow, and SEM images revealed that the powder was sphere-like, with a controlled particle size of 6 μm or less, good dispersion and a wrinkled and depressed surface. Confocal laser scanning microscopy (CLSM) images revealed that curcumin nanoparticles were uniformly distributed in the dry powder inhalation. Both the twin stage impinger (TSI) and Next Generation Impactor (NGI) showed that the multidrug powder has excellent aerosol performance, with a fine particle fraction (FPF) ranging from 68.93% to 77.75%. The multidrug powder presented satisfactory antibacterial effects at low doses, thereby reducing systemic toxicity due to high-dose delivery. In vitro drug release experiments also demonstrated that the powder had great release properties. In conclusion, a multidrug codelivery system of curcumin nanosuspensions and ciprofloxacin with N-acetylcysteine dry powder was prepared that was suitable for lung infection therapy.
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