INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Jing Lin,Lei Yu,Qujiang Sun,Fangkuo Wang,Yong Cheng,Sheng Wang,Xu Zhang
It is imminently to seek for high energy density in addition to a sensational lifetime of lithium-ion batteries (LIBs) to meet growing requisition in the energy storage application. Anode containing metal oxide composite is being thoroughly investigated for their higher capacity than that of the commercial graphite. A multiporous core-shell structured metal oxide composite anode possessing the excellent capacity and superb lifespan for LIBs is designed. In detail, metal oxide ( i.e., MnO) is encapsulated in N-doped carbon shell (MnO@N–C) via coprecipitation-annealing technique. During annealing, abundant void space among MnO cores/between MnO cores and N–C shells is obtained. This space can efficaciously buffer volume changes of MnO upon cycles. Benefiting from the unique structure and heteroatom doping , the capacity of MnO@N–C microcube anode exhibits 576 mAh g −1 at 5 A g −1 with an ultra-long lifespan more than 3500 cycles. The connection between the electrode characteristics and structure is concurrently examined by adopting kinetic analysis. Finally, a full lithium-ion battery is presented, applying the MnO@N–C (anode) and Nick-rich layered oxide (cathode). It is believed that structural designing with heteroatom doping can be utilized in vaster fields for superior capabilities.
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DOI
高影响因子
RARE METALS
·
2021
·Vol. 40
·期 9
·2455-2463
·
IF 4.003
Jia Xin-Xin,Yu Xin-Zhi,Lu Bing-An
Potassium-selenium (K-Se) batteries are a promising electrical energy storage candidate because of the cost-effectiveness and material sustainability, yet they suffer from shuttle effect, volume expansion and low powder density. The development of Se-based cathode is an effective way to overcome the above issues. Here we designed a hollow nano-spherical Co-Fe bi-metallic selenide coated with N-doped carbon (denoted as CFS@N-C) as cathode for K-Se batteries. Bimetallic selenide is benefit to improve the conductivity of composite materials; N-doped carbon layer encapsulation effectively inhibits the dissolution of poly-selenides and relieves the volume expansion. The as-prepared K-Se battery exhibits excellent rate performance (300 mAh·g –1 at 1000 mA·g –1 ) and slow-charge/ultrafast-discharge capability (discharge at 5000 mA·g –1 and charge at 100 mA·g –1 with ultrahigh capacity of 227 mAh·g –1 ) with Coulombic efficiency nearly 100%. In addition, the ex-situ high-resolution transmission electron microscopy (HRTEM) images reveal that the charge–discharge mechanism of CFS@N-C is K + replaces the bimetal and forms K 2 Se. The unique design in this work may provide certain directions on researching for high power density K-storage materials.
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DOI
高影响因子
ENERGY & FUELS
·
2014
·
IF 2.733
Hongchao Yan,Xiaofei Song,Feng Xin,Xingang Li,Guangjin Chen,Yong Wang
Storage capacities, formation rates, and induction periods of methane hydrates in slurries of solid n-tetradecane, which is a phase change material (PCM), were investigated experimentally in a semibatch hydrator with a stirrer. The hydrations were carried out at an initial temperature of 277.1 K, which was slightly lower than the melting point of n-tetradecane in a slurry; the stirring rate was 800 rpm, and the experimental pressures were in the range of 5.00–6.28 MPa. The emulsion of PCM was prepared using a high-speed disperser and then cooled to solidify the PCM droplets in an oil-in-water (O/W) emulsion. The highest storage capacity of 158.7 V/V was found at 5.26 MPa, and the corresponding hydration time was only 78 min. The hydration rates divided into three stages: a constant speed was observed initially, followed by a steep increase, and a slowing in the final step. The maximum hydration rate was 0.0096 molCH4/(molH2O min) at 5.26 MPa. The induction time of hydration was reduced largely to a few minutes. Therefore, the fast formation rate and short induction time led to free water being trapped in the hydrate and much higher pressures would make the storage capacity smaller. Therefore, the advantage of our method is improving heat transfer during hydration, which results in a fast hydration rate and high storage capacity. On the other hand, one disadvantage is that the method is somewhat complex.
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DOI
高影响因子
RUSSIAN JOURNAL OF ORGANIC CHEMISTRY
·
2025
·Vol. 61
·期 5
·872-880
·
IF 0.9
Tong Mengnan
A versatile, convenient, mild, and efficient method for the synthesis of N-benzoyloxyamines containing alkenone or allyl ester groups, starting from hydroxylamine derivatives, is developed and successfully extended to a broader range of tertiary amine analogs.
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2019
·
IF 1.163
Jing Chen,Qing Luo,Xiao Zhen Ma
Thermally responsive hydrogels have drawn significant research attention recently because of their simple use as smart catalyst. Here we design a series of responsive hydrogels that incorporate graphene oxide (GO)-Ag composites into thermo-responsive N-isopropylacrylamide (NIPAM) at different mass ratios. It was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and UV-visible absorption spectroscopy. Meanwhile, the PNIPAM/GO-Ag hydrogels showed high catalytic activity in the hydrogenation reaction of nitrophenol to aminophenol and acted as a tunable catalyst which the swelling and collapsing could be triggered by small temperature changes around the lower critical solution temperature (LCST) of the hydrogels. The present approach can shed new light on designing of catalytic material like GO-Ag composite responsive hydrogel with promising applications in catalysis.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Q.Q. Xiong,J.J. Lou,X.J. Teng,X.X. Lu,S.Y. Liu,H.Z. Chi,Z.G. Ji
Exploring advanced cathode materials is critical for the development of large-scale lithium ion storage. Herein we report nitrogen-doped carbon (N-C) coated LiFePO 4 nanospheres (N-C@LFP) synthesized by a facile hydrothermal plus chemical polymerization method . N-C@LFP nanospsheres exhibit diameters of 400–700 nm and show core-shell structure with a thin N-C layer of ∼2.5 nm. As a cathode for lithium ion batteries (LIBs), N-C@LFP nanospheres present excellent electrochemical performance with higher electrochemical reactivity, better reversibility and smaller polarization as compared to the unmodified pristine LiFePO 4 nanospheres . The N-C@LFP electrode delivers superior specific capacity of 158.4 mAh g −1 after 200 cycles at 1 C and good rate capability (107.5 mAh g −1 at 30 C). The enhanced electrochemical performance is attributed to the conductive N-C layer coating with fast ion/electron transfer. The N-C@LFP nanospheres are thus promising for commercial application in high-energy & power LIBs.
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DOI
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Shunwei Wu,Yongzheng Yin,Chunyan Sun,Chenghai Ma
A highly selective solid-state fluorescent sensor based on N-doped carbon quantum dots (N-CQDs) and cotton fiber paper (CFP) is reported for the determination of trace mercury (II)(Hg2+). The N-doped carbon quantum dots on cotton fiber paper (N-CQDs@CFP) was synthesized using a facile one-step microwave hydrothermal method. Multiple approaches were employed to fully investigate the morphology and chemical structure of the paper-based fluorescent sensor. The N-CQDs were chemically bonded onto the CFP, which offers good reproducibility and stability of the sensor. The N-CQDs@CFP showed high-intensity blue emission in dark-field imaging, and the fluorescence was quenched by Hg2+. The Hg2+ in aqueous samples was easily determined and visually monitored. There was good linearity from 0 to 250 μM, and the limit of detection was 34 nM. The paper-based fluorescent sensor provided accurate and rapid determination of Hg2+ upon comparison with flame atomic absorption spectrophotometry (FAAS). The simple preparation, rapid detection (< 5 min), low cost, and easy-handling illustrate that the reported sensor has a significant value in environmental monitoring.
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产品关联
DOI
高影响因子
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2022
·Vol. 237
·期 6
·1051-1053
·
IF 0.365
Hua-Xiang Zhang
C 33 H 40 CdN 8 O 6 , triclinic,
P
1
‾
(no. 2), a = 10.6468(11) Å, b = 11.6739(9) Å, c = 14.5312(9) Å, α = 93.976(5)°, β = 102.005(7)°, γ = 111.827(8)°, V = 1618.4(2) Å 3 , Z = 2, R
gt ( F ) = 0.0480, wR
ref ( F
2 ) = 0.1102, T = 293(2) K.
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DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Huimin Li,Shasha Li,Yuanrui Wang,Yafeng Li,Qian Qiao
In this article, two novel metal-organic frameworks (MOFs) have been constructed by tuning the metal ions using identical ligand—FDA. Although both of them contain linear trinuclear secondary building unit (SBU) and infinite chain along with SBU, the different metal ions as node can result in the different connection of FDA. As a result, compound I shows 4,4-networks, and compound II contains 3-ring and 4-ring.
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DOI
DYES AND PIGMENTS
·
2025
·
IF 4.2
Tingye Gu,Qing Guo,Dongming Qi,Pu Gao,Weiguo Chen,Zhihua Cui,Sateesh Bandaru
N -hydroxysuccinimide esters (NHS esters) are widely recognized as amine-reactive compounds due to their mild reaction conditions and high efficiency. In this study, NHS ester group was introduced into the dye chromophores to design and synthesize carboxylic acid succinimidyl ester dyes ( CSED s) in red, yellow and blue colors. The CSED s were characterized using high-resolution mass spectrometry, proton nuclear magnetic resonance, and infrared spectroscopy. When the NHS ester group was introduced, UV–vis absorption spectroscopy only slightly affected the molar extinction coefficient and maximal absorption wavelength. Hydrolysis studies demonstrated that CSED s hydrolyzed slowly in acidic environments but quickly in weakly alkaline ones, with near-complete hydrolysis taking place at pH 8.5 after half an hour. It was discovered that CSED s could successfully dye silk fibroin at room temperature in weakly alkaline conditions, producing a high color depth and more than 95 % color fixing. The binding of CSED s to silk fibroin was confirmed through covalent bonds using DMF stripping method and dialysis method. Furthermore, the color fastness of dyed silk fibroin to washing and rubbing was rated above grade 4–5. Compared to commercial dyes, the milder dyeing conditions of CSED s can save energy and did not require a significant amount of salt to promote the dyeing process.
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产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 4
·1714
·
IF 4.6
Yanping Wu,Yuncong Chen,Shankun Yao,Shumeng Li,Hao Yuan,Fen Qi,Weijiang He,Zijian Guo
Cationic, water-soluble benzophenothiaziniums have been recognized as effective type I photosensitizers (PSs) against hypoxic tumor cells. However, the study of the structure–property relationship of this type of PS is still worth further exploration to achieve optimized photodynamic effects and minimize the potential side effects. Herein, we synthesized a series of benzophenothiazine derivatives with minor N-alkyl alteration to study the effects on the structure–property relationships. The cellular uptake, subcellular organelle localization, reactive oxygen species (ROS) generation, and photocytotoxicity performances were systematically investigated. NH2NBS and EtNBS specifically localized in lysosomes and exhibited high toxicity under light with a moderate phototoxicity index (PI) due to the undesirable dark toxicity. However, NMe2NBS with two methyl substitutions accumulated more in mitochondria and displayed an excellent PI value with moderate light toxicity and negligible dark toxicity. Without light irradiation, NH2NBS and EtNBS could induce lysosomal membrane permeabilization (LMP), while NMe2NBS showed no obvious damage to lysosomes. After irradiation, NH2NBS and EtNBS were released from lysosomes and relocated into mitochondria. All compounds could induce mitochondria membrane potential (MMP) loss and nicotinamide adenine dinucleotide phosphate (NADPH) consumption under light to cause cell death. NMe2NBS exhibited remarkable in vivo photodynamic therapy (PDT) efficacy in a xenograft mouse tumor (inhibition rate, 89%) with no obvious side effects. This work provides a valuable methodology to investigate the structure–property relationships of benzophenothiazine dyes, which is of great importance in the practical application of PDT against hypoxia tumor cells.Keywords:benzophenothiaziniums;type I photosensitizers;reactive oxygen species;phototoxicity index;lysosomal membrane permeabilization;mitochondria membrane potential;nicotinamide adenine dinucleotide phosphate;photodynamic therapy
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DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yingying Wei,Lin Chen,Junli Wang,Xuguang Liu,Yongzhen Yang,Shiping Yu
In order to avoid the interference of autofluorescence and improve tissue penetration capability of carbon quantum dots (CQDs) in biological imaging, the synthesis of long-wavelength emission CQDs was achieved in this work. Boron and nitrogen co-doped CQDs (BN-CQDs) were synthesized by one-step microwave assisted hydrothermal method with o -phenylenediamine as carbon and nitrogen source, boric acid as boron source. The BN-CQDs (QY = 13.79%) synthesized under the optimal conditions exhibit excitation independence, a large Stoke shift, satisfactory fluorescent stability, good biocompatibility and low toxicity, which can meet the basic requirements as cell imaging agent. Cell imaging measurements prove their increased intracellular accumulation with the extension of incubation time with HeLa cells, and clearly observable BN-CQDs imaging for cell morphology. Hence BN-CQDs can be used as a good cell imaging agent.
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DOI
高影响因子
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