ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Haoqiang Ma,Chenxin Jin,Guojun Xu,Lijun Wen,Chuanbin Tu,Fugen Sun,Yong Li,Lang Zhou,Zhihao Yue
Silicon-carbon composites are considered as the most promising anode materials for lithium ion batteries . Currently, most silicon-carbon composites were prepared by solid nano‑silicon particles as the silicon source, which suffers from high price and uneven dispersion. Here, we used tetraethyl orthosilicate as the liquid silicon source and polyvinylpyrrolidone as the carbon source. Both were homogeneously mixed in the liquid phase, and then processed through electrospinning, carbonization and nitrogen-doped processes to obtain free-standing nitrogen-doped carbon coated silicon monoxide (N-doped C/SiO x ). When served as anode material, N-doped C/SiO x can possess a reversible capacity of 488 mAh g −1 at 0.5 C (0.6 A g −1 ) and 377 mAh g −1 at a high current density of 2 C (2.4 A g −1 ). In addition, copper foil is not used as a collector for free-standing electrode structure, and eliminates the coating process of traditional electrodes, which reduces production costs. It is proposed that a facile strategy to fabricate silicon-carbon composites with good electrochemical properties and cost-effective way for lithium ion batteries.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Shiyan Li,Hongquan Fu,Xingshuai Zhang,Xu Liu,Giulia Tuci,Giuliano Giambastiani,Cuong Pham-Huu,Yuefeng Liu
H 2 S selective oxidation to elemental sulfur (S 8 ) is a typical reaction where the mass product diffusion ( e.g ., S 8 ) through the catalytic bed is crucial as well as the reagents accessibility ( e.g ., H 2 S, O 2 ) to the active sites. The NaNO 3 -assisted pyrolysis of polyacrylamide was applied to synthesize defect-enriched N-doped carbon nanosheets with thickness up to c.a. 2 nm, featured by fully accessible and highly interconnected pores, for boosting the H 2 S selective oxidation process. The PAM-0.3-700 sample has revealed an unprecedented desulfurization activity with sulfur formation rate of 1165 g sulfur kg cat. −1 h −1 , other than a remarkable stability (>80 h). Experimental and theoretical studies have unveiled the critical role of edge sites containing unpaired electrons and nitrogen species with respect to the material aptitude towards O 2 dissociation and HS - activation. The material in presence of a highly interconnected porous network facilitates the reactants/product diffusion especially for catalysis operated under harsh experimental conditions.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Lixuan Zhang,Sibing Xie,Anqi Li,Yu Li,Fenghua Zheng,Youguo Huang,Qichang Pan,Qingyu Li,Hongqiang Wang
Metal sulfides have been considered promising anode materials for lithium-ion batteries (LIBs), due to their high capacity. However, the poor cycle stability induced by the sluggish kinetics and poor structural stability hampers their practical application in LIBs. In this work, MoS 2 /MnS/SnS trimetallic sulfides heterostructure coated with N -doped carbon nanorods (MMSS@NC) is designed through a simple method involving co-precipitation, metal chelate-assisted reaction, and in-situ sulfurization method. In such designed MMSS@NC, a synergetic effect of heterojunctions and carbon layer is simultaneously constructed, which can significantly improve ionic and electronic diffusion kinetics, as well as maintain the structural stability of MMSS@NC during the repeated lithiation/delithiation process. When applied as anode materials for LIBs, the MMSS@NC composite shows superior long-term cycle performance (1145.0 mAh/g after 1100 cycles at 1.0 A/g), as well as excellent rate performance (565.3 mAh/g at 5.0 A/g). This work provides a unique strategy for the construction of multiple metal sulfide anodes for high-performance LIBs.
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PubMed
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2023
·
IF 6.1
Renjie Xie,Jianbin Lu,Jian Wang
The detection of dissolved gases in the oil of oil-immersed transformers is essential to evaluate the operating status of oil-immersed transformers. In this study, a CuO/TiO 2 /N-MWCNTs composites-based sensor was fabricated by hydrothermal method for the detection of dissolved CO gas in oil. The introduction of N-MWCNTs with high specific surface area, high electrical conductivity and multiple adsorption sites effectively improved the response value and response/recovery performance for CO. The response can reach 4.33 at a CO concentration of 50 ppm, which is 1.74 times higher than that of the CuO/TiO 2 sensor. In addition, the prepared sensor presents a fast response/recovery time (230 s/60 s) to CO, and has excellent selectivity and long-term stability. Finally, a multi-concentration CO alarm system was constructed through a reasonable circuit design. It is shown that the CuO/TiO 2 /N-MWCNTs-based sensor can achieve high-precision CO detection, which can provide a new idea for the detection of dissolved CO gas in the oil of oil-immersed transformers.
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EUROPEAN JOURNAL OF PHARMACOLOGY
·
2023
·
IF 5
Min Fang,Hongling Hou,Bo Feng,Tianzhu Zhang,Xiaomei Zhu,Zhen Liu
Intracerebral hemorrhage (ICH) is the most devastating subtype of stroke, nevertheless specific treatments with conclusive clinical benefit in improving outcomes of ICH remain lacking. The present study applied dl-3-n-butylphthalide (NBP), a compound approved for the treatment of ischemic stroke and rarely studied in ICH, to an experimental animal model of ICH, aiming to evaluate the therapeutic effects of NBP on ICH and the potential mechanisms. The results showed that rats receiving NBP administration exhibited a structural and functional restoration of brain after ICH mainly manifested as alleviation of neuronal apoptosis , suppression of neuroinflammation and oxidative stress , neurovascular remodeling, and eventually improvement of neurological deficits. In addition, several protein targets of NBP were revealed, which mainly play molecular functions of ribonucleoside triphosphate phosphatase activity, pyrophosphatase activity, hydrolase activity and GTPase activity, and participate in the biological process of brain development by regulating the formation of cellular components such as spindles, polymeric cytoskeletal fibers, microtubules and synapses, through mediating pathways such as VEGF signaling pathway, Fc epsilon RI signaling pathway, ECM-receptor interaction, Fc gamma R-mediated phagocytosis , peroxisome and so on, guiding the mechanism exploration of NBP therapy to some extent. Taken together, the study added some new evidence to the application of NBP in ICH treatment.
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Biomass Conversion and Biorefinery
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2023
·
IF 4
Chen Jun Xiu,Li Jin Hao,Bao Agula
The development of porous carbon materials with high CO 2 adsorption capacity is crucial for addressing the current issues of industrial air pollution and global warming. In this study, B/N codoped porous carbon materials were prepared via a combined strategy involving the use of a self-sacrificing template in conjunction with potassium hydroxide activation; moreover, g-C 3 N 4 was used as the N source and boric acid was used as the B source. The pore structure and surface chemistry were investigated in detail using different techniques such as X-ray diffraction, scanning electron microscopy, N 2 adsorption and desorption, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Results showed that the prepared material exhibited the highest specific surface area (2278 m 2 /g) and pore volume (1.00 cm 3 /g) when the ratio of B/N sources was 1:0.5; moreover, its CO 2 adsorption value (3.26 mmol/g) was higher than those of most codoped adsorbents.
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MOLECULES
·
2023
·Vol. 28
·期 18
·6443
·
IF 4.6
Chaoyan Zhang,Xiaoyu Zhou,Fei Yan,Jing Lin
Herein, we describe a fast and highly sensitive electrochemical sensor for doxorubicin (DOX) detection based on the indium tin oxide (ITO) modified with a binary material consisting of vertically-ordered mesoporous silica films (VMSFs) and N-doped graphene quantum dots (NGQDs). VMSFs, with high permeability and efficient molecular transport capacity, is attached to the ITO electrode via a rapid and controllable electrochemical method, which can serve as a solid template for the confinement of numerous NGQDs through facile electrophoresis. By virtue of the excellent charge transfer capacity, π-π and electrostatic preconcentration effects of NGQDs, as well as the electrostatic enrichment ability of VMSF, the presented NGQDs@VMSF/ITO shows amplified electrochemical signal towards DOX with a positive charge, resulting in good analytical performance in terms of a wide linear range (5 nM~0.1 μM and 0.1~1 μM), high sensitivity (30.4 μA μM−1), and a low limit of detection (0.5 nM). Moreover, due to the molecular sieving property of VMSF, the developed NGQDs@VMSF/ITO sensor has good selectivity and works well in human serum and urine samples, with recoveries of 97.0~109%, thus providing a simple and reliable method for the direct electrochemical analysis of DOX without complex sample pretreatment procedures.
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Molecular Catalysis
·
2023
·
IF 4.6
Heshan Cai,Lin Fu,Hongyan Pan,Zaixin Yan,Teng Chen,Tianxiang Zhao
Microporous carbon materials are widely used in CO 2 adsorption because of their unique structure and excellent stability. In this work, N-doped porous carbon (NPC) with an ultramicroporous structure was prepared through the carbonization of an N-doped polymer and KOH at 600 °C, 700 °C, and 800 °C, respectively. The prepared NPC exhibited excellent CO 2 adsorption properties of up to 6.95 mmol· g −1 at 1 bar and 0 °C, and this value is considerably higher than that of the parent N-doped polymer. The excellent CO 2 adsorption performance is due to the well-defined ultramicroporous structure and high specific surface area of NPC. Moreover, these porous carbons can be combined with tetrabutylammonium bromide (TBAB) to fix CO 2 into various cyclic carbonates, with a yield of up to 99% without any solvent. Whether the cause is the adsorption or catalytic conversion of CO 2 , NPC-700 exhibits excellent stability and can be cycled multiple times without significant reduction in its performance.
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Journal of Energy Storage
·
2023
·
IF 9.4
Qingmiao Zhang,Tianhao Yao,Qiangrui He,Heng Wang,Zhicheng Liu,Daquan Wang,Hongkang Wang,Lingjie Meng
Transition metal sulfides (TMSs) have been considered as up-and-coming anode materials for lithium-ion batteries (LIBs) owing to their large theoretical capacity and good reversibility . However, obvious volume variation and sluggish kinetics greatly limit their practical application. To address this issue, we successfully design and fabricate hollow CoS 2 /MoS 2 nanospheres and effectively enhance their lithium storage performance via N-doped carbon-coating (CoS 2 /MoS 2 @N-C). The unique hollow structure provides shortened ion-diffusion path, while the N-doped carbon shells buffer the severe volume changes during cycling and improve the electronic conductivity of the electrode. When used as an anode material for LIBs, the CoS 2 /MoS 2 @N-C displays high specific capacity (1056.9 mA h g −1 at 100 mA g −1 ), excellent cycling stability (653.9 mA h g −1 after 250 cycles at 1000 mA g −1 ), and rate capability (685 mA h g −1 at 2000 mA g −1 ). The CoS 2 /MoS 2 @N-C||LiFePO 4 full-cell LIB is also assembled and exhibits remarkable performance. The remarkable electrochemical performance of CoS 2 /MoS 2 @N-C electrode could be assigned to the synergistic enhancement effect of the N-doped carbon coating and hollow structure, which efficiently shorten the ion diffusion path , boost the charge transfer rate, and alleviated the volume changes of the electrode upon cycling.
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ACS ES&T Water
·
2023
·
IF 5.3
Peizeng Yang,Jiayue Dong,Haiyan Wang,Teng Zhang,Gregory V. Korshin,Junhe Lu
N-Nitrosodimethylamine (NDMA) is a disinfection byproduct and a probable human carcinogen formed during water treatment processes. While its generation in engineered systems has been extensively explored, its formation in natural environments is inadequately understood. This study demonstrates that compounds with dimethylamine (DMA) functionality exposed to sunlight irradiation in the presence of nitrite (NO2–) react to form NDMA. The molar yields of NDMA ranged from 0.006 to 0.035% after 6 h irradiation. The radicals generated by the photolysis of NO2–, notably •OH, NO•, and NO2•, play critical roles in this process. Three reaction pathways are involved in the NDMA formation. In the first and second pathways, nitrogen oxide radicals couple or dimerize to form the nitrosating agents N2O3 and N2O4, which attack the DMA moiety, yielding NDMA. In the third pathway, the DMA moiety is oxidized by •OH via H-abstraction to produce a nitrogen-centered radical (CH3N•CH3) which, followed by the addition of a NO•, yields NDMA. Radical quenching experiments combined with theoretical calculations suggest that the •OH/H-abstraction pathway is more favorable. Given that many environmental contaminants contain DMA functionalities, the photochemical formation pathway of NDMA in the sunlit surface waters may be important for aquatic environments.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 22
·1-21
·
IF 2.8
Nazir Ahsan,Huo Pengwei,Jagirani Muhammad Saqaf,Akram Muhammad Yasir,Wang Huijie
In this study, a plasmonic p–n heterojunction Ag@Ag 2 O–BiVO 4 photocatalyst was successfully prepared by a simple chemical precipitation-reduction process. The obtained samples were tested by various measurements and the photocatalytic behavior in the decomposition of tetracycline (TC) under irradiation with visible light was studied. The photodegradation study exhibits that Ag@Ag 2 O–BiVO 4 has the optimum activity and can efficiently degrade 83.52% of TC in 60 min by irradiation with visible light. Furthermore, the Ag@Ag 2 O–BiVO 4 exhibited more pronounced visible light absorption and the best performances than the BiVO 4 and Ag 2 O–BiVO 4 , which was mainly due to the LSPR of plasmonic Ag. The experimental radical trapping proved that the active species of the photocatalytic process act in the following order: ·O 2 − > h + > · OH. To find intermediates, the possible TC degradation pathways via HPLC–MS were also investigated. This research provides a successful method to develop a plasmonic photocatalyst with p–n heterojunction for wastewater treatment.
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Advanced Electronic Materials
·
2023
·Vol. 10
·期 3
·2300651
·
IF 6.2
Tianpeng Yu,Shuyi Hou,Zhenliang Liu,Yiru Wang,Jiang Yin,Xu Gao,Nannan Liu,Guoliang Yuan,Lei Wu,Yidong Xia,Zhiguo Liu
Organic field-effect transistors (OFETs) hold great promise for applications in non-volatile memories, detectors, and artificial synapses due to the good flexibility and biocompatibility. However, certain drawbacks such as high operating voltages and significant degradation in endurance characteristics have hindered their practical implementations. Herein, a novel approach is proposed to enhance the performance of OFETs by incorporating a bi-functional n-type polymer semiconductor interlayer, Poly-{[N,N'-bis(2-octyldodecyl)naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)} (N2200), into a pentacene OFET structure. The device exhibits remarkable improvements, with reliable P/E operation cycles of over than 10 4 and a retention time of more than 10 years. On one hand, the inclusion of N2200 as an n-type semiconductor effectively reduces the height of hole-injection barrier for trapping and thus reducing the working voltage based on the electrostatic induction theory. On the other hand, n-type semiconductor N2200 serves as a native hole-consumption (or hole-trapping) dielectric, and its narrower bandgap restrains the formation of deep hole-traps, thus favoring the endurance characteristics of the OFET.
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