ACS Nano
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2019
·
IF 13.903
Qingping Wu,Xuejun Zhou,Jun Xu,Fahai Cao,Chilin Li
How to simultaneously restrain the loss of active species and facilitate the conversion reaction under high S loading condition is the key to solve the commercialization of Li–S batteries. For this system, the availability of raw materials and simplicity (high efficiency) of synthetic strategies are also important factors. Herein, we propose an interlaced two-dimensional (2D) carbon material as advanced Li–S cathode host characterized by corrugated monolithic morphology and Co/N dopants as dual lithiophilic–sulfiphilic sites. This 2D structure is derived from a cheap biomass precursor, adenine, with bonding interaction with a MgCl2 hydrate template via a facile ionothermal method. It allows a homogeneous spatial distribution of S/Li2S deposits and strong adsorbability and enhanced conversion kinetics for polysulfides. Benefiting from the synergistic effects of corrugated 2D conductive matrix and embedded heteroatom/nanodot catalyst, the resultant sulfur cathode releases a high specific capacity of 1290.4 mA h g–1 at 0.2 C, small capacity fading rate of 0.029% per cycle over 600 cycles at 2 C, superior rate performance up to 20 C, and considerable areal capacity retention of 6.0 mA h cm–2 even under an ultrahigh sulfur loading up to 9.7 mg cm–2.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Jun Zhang,Danyang Nan,Shuang Pan,Hui Liu,Huan Yang,Xiaoli Hu
In this work, nitrogen and sulfur dual-doped CDs (N,S-CDs) were prepared via a facile one-pot hydrothermal method from citric acid and N -acetyl-L-cysteine with a high quantum yield (QY) of 49%. As-fabricated N,S-CDs had a size around 2.5 nm and exhibited excitation-independent emission and excellent luminescent properties. The fluorescent sensor based on the N,S-CDs showed a highly sensitive detection of baicalein with a detection limit (LOD) of 0.21 μmol L −1 in the linear range from 0.69 to 70.0 μmol L −1 . The fluorescence of the N,S-CDs could be effectively quenched by baicalein based on static quenching. In addition, the temperature sensor based on the synthesized N,S-CDs showed a good linear relationship between temperature and fluorescence (FL) intensity with a temperature range from 5 °C to 75 °C. Furthermore, the synthesized N,S-CDs were successfully applied to the measurement of baicalein in real samples. In a word, the N,S-CDs had great potential to be worked as fluorescence sensors to monitor the concentration of baicalein and temperature.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2019
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IF 2.066
Amin Khan,Haojie Yu,Li Wang,Pavel A. Zhizhko,Dmitry N. Zarubin,Dmitry A. Lemenovskiy,Fazal Haq,Muhammad Usman,Ahsan Nazir,Kaleem-ur-Rehman Naveed
Herein, poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -(methacrylohydroxyhexane azobenzene)s) (P(FHEMA- co -MAZOHE)s) were prepared by random copolymerization and were characterized by proton nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) to confirm the structures and molecular weights respectively. Thermal variations were analyzed by thermogravimetric (TG), differential thermogravimetric (DTG) and differential scanning calorimetry (DSC) techniques. Finally, redox and photo stimuli-responsive properties were confirmed by cyclic voltammetry (CV) and ultraviolet–visible spectroscopy (UV–vis) respectively. The results revealed that (P(FHEMA- co -MAZOHE)s) can be useful as information storage materials.
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JOURNAL OF APPLIED TOXICOLOGY
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2019
·Vol. 39
·期 12
·1640-1650
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IF 3.065
Yicong Chang,Feng Wang,Yang Yang,Yuanyuan Zhang,Ishfaq Muhammad,Rui Li,Changwen Li,Ying Li,Chenxi Shi,Xin Ma,Beili Hao,Fangping Liu
Acetaminophen (APAP) is an antipyretic and analgesic, which is commonly associated with drug-induced hepatic injury. C2-ceramide plays a key role in mediating cell life activities, and oltipraz was extensively studied as a cancer chemopreventive agent. Glutathione S -transferase A1 (GSTA1) acts as a vital liver detoxification enzyme. Hepatocyte nuclear factor 1 (HNF-1) regulates various cellular signaling pathways. In this study, we investigated the effects of C2-ceramide and oltipraz on APAP-induced hepatocyte injury and the changes of HNF-1 and GSTA1. Results showed that C2-ceramide (6 μmol/L) exacerbated APAP-induced hepatocyte injury and caused a significant decrease ( P < .01) in HNF-1 and GSTA1 expressions. Meanwhile, GSTA1 content in supernatant was significantly increased ( P < .01). In contrast, oltipraz (8 μmol/L) reduced the injury and significantly elevated ( P < .01) HNF-1 and GSTA1 expressions while GSTA1 content in supernatant was significantly decreased ( P < .01). In conclusion, these findings revealed that C2-ceramide inhibited HNF-1 and GSTA1 expression and exacerbated hepatocyte injury, while oltipraz treatment results in the reduction of hepatocyte injury, and promoted HNF-1 and GSTA1 expression. Additionally, the changes in HNF-1 and GSTA1 were related to APAP-induced hepatocyte injury. These results were useful to investigate the mechanism of an antipyretic and analgesic drug combination.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Shan Yuan,Miaomiao Weng,Dajun Liu,Xingquan He,Li−Li Cui,Tewodros Asefa
Platinum (Pt)-based catalysts are widely used for the oxygen reduction reaction (ORR) in many energy conversion and storage devices, such as fuel cells and metal–air batteries. However, Pt is among the least earth abundant and most expensive elements; as a result, these energy devices are currently difficult to scale up. This has motivated researchers to try to develop sustainable and alternative catalysts that can replace Pt as well as other noble metal-based catalysts. Herein, novel Co nanocrystals-loaded, Zn, N, and S codoped carbon materials, dubbed (Co, Zn)/NSC, which have hollow spherical structures and which can serve as efficient ORR catalysts, are developed via a facile synthetic method involving microemulsion and pyrolysis. The key in the synthesis of these nonprecious metal-containing heteroatom-doped nanostructured carbon catalysts is the preparation of nanosized, mixed metal–organic frameworks (MOFs) in solution using microemulsion, and the exploitation of their morphology to produce hollow spherical structures via pyrolysis. Elemental mapping shows the presence of Co, Zn, N, and S atoms throughout the structures of the materials. The material obtained at pyrolysis temperature of 800 °C, denoted (Co, Zn)/NSC-800, exhibits excellent electrocatalytic activity for ORR in alkaline and acidic media, with onset potentials of 1.000 and 0.802 V vs RHE, respectively. In addition, the catalyst is stable and tolerates the methanol crossover reaction in both cases. Thus, this material has the potential to replace Pt catalysts in fuel cells. Moreover, the synthetic approach used to make it can be extended to produce other robust, nonprecious transition metal-based catalysts for ORR.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Tingting Hou,Nengchao Luo,Yi-Tao Cui,Jianmin Lu,Lei Li,Katherine E. MacArthur,Marc Heggen,Ruotian Chen,Fengtao Fan,Wenming Tian,Shengye Jin,Feng Wang
Engineering the electronic properties of heterogeneous catalysts is an important strategy to enhance their activity towards CO 2 reduction. Herein, we prepared partially sulfurized cerium oxide (CeO x -S) nanoclusters with the size less than 2 nm on the surface of ZnIn 2 S 4 layers. Surface electronic properties of CeO x -S nanoclusters are facilely modulated by cerium coordination to sulfur, inducing the emergence of abundant Ce 3+ and oxygen vacancies. For the photoreduction of CO 2 , CeO x -S/ZnIn 2 S 4 hybrid catalysts exhibited a CO productivity of 1.8 mmol g −1 with a rate of 0.18 mmol g −1 h −1 , which was twice as higher as that of ZnIn 2 S 4 catalyst using triethylamine as a sacrificial electron donor. Further mechanistic studies reveal that the photogenerated electrons are trapped by oxygen vacancies on CeO x -S/ZnIn 2 S 4 catalysts and subsequently transfer to CO 2 , benefiting the activation of CO 2 . Moreover, the extremely high selectivity of CO is derived from the weak adsorption of CO on the surface of CeO x -S/ZnIn 2 S 4 catalysts.
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Energy & Environmental Science
·
2018
·Vol. 11
·期 9
·2620-2630
·
IF 30.067
Yingze Song,Wen Zhao,Long Kong,Li Zhang,Xingyu Zhu,Yuanlong Shao,Feng Ding,Qiang Zhang,Jingyu Sun,Zhongfan Liu
Lithium–sulfur (Li–S) batteries are deemed as one of the most promising next-generation energy storage systems. However, their practical application is hindered by existing drawbacks such as poor cycling life and low Coulombic efficiency due to the shuttle effect of lithium polysulfides (LiPSs). We herein present an in situ constructed VO2–VN binary host which combines the merits of ultrafast anchoring (VO2) with electronic conducting (VN) to accomplish smooth immobilization–diffusion–conversion of LiPSs. Such synchronous advantages have effectively alleviated the polysulfide shuttling, promoted the redox kinetics, and hence improved the electrochemical performance of Li–S batteries. As a result, the sulfur cathode based on the VO2–VN/graphene host exhibited an impressive rate capability with ∼1105 and 935 mA h g−1 at 1C and 2C, respectively, and maintained long-term cyclability with a low capacity decay of 0.06% per cycle within 800 cycles at 2C. More remarkably, favorable cyclic stability can be attained with a high sulfur loading (13.2 mg cm−2). Even at an elevated temperature (50 °C), the cathodes still delivered superior rate capacity. Our work emphasizes the importance of immobilization–diffusion–conversion of LiPSs toward the rational design of high-load and long-life Li–S batteries.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 35
·12385-12392
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IF 4.099
Wei Shuang,Lingjun Kong,Ming Zhong,Danhong Wang,Jian Liu,Xian-He Bu
The construction of specific structures and heteroatom-doped nanomaterials is essential for enhancing the electrochemical performance of lithium-ion batteries (LIBs). Herein, three structures of cobalt nanoparticle embedded N,S-codoped carbon (CNSCo-x) nanocomposites are obtained by pyrolysis of different amounts of thioacetamide (TAA) sulfuretted zeolitic imidazolate frameworks (ZIF-67) under an Ar/H2 atmosphere. With the addition of 0.5 mmol of TAA, CNSCo-0.5 with an orderly and porous nanoplate structure is obtained. The CNSCo-0.5 exhibits the best rate behavior and cycling stability with an initial discharge capacity of 1355 mA h g−1 at 200 mA g−1, and high discharge capacities of 1360.4 mA h g−1 at the 200th cycle at 200 mA g−1, and 647.9 mA h·g−1 at the 400th cycle at 1000 mA g−1. This facile synthetic strategy could be extended to other MOFs and is significant for developing new materials for LIBs.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
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IF 5.667
Guotai Yang,Xiangyu Meng,Yutong Wang,Mingyao Yan,Zoraida P. Aguilar,Hengyi Xu
A novel 2-step lectin-magnetic separation (LMS) method combined with gold nanoparticle (AuNPs) -based colorimetric system for specifically and quantitatively detecting S. aureus in blood samples was established. In this study, wheat germ agglutinin lectin from Triticum vulgaris (wheat) (WGA) was applied for the first time as a recognition agent in a 2-step magnetic separation method using magnetic nanoparticles (MNPs) for effective and low-cost bacteria enrichment. A quantitative detection strategy based on the long dsDNA amplicons stabilized with AuNPs against salt-induced aggregation was investigated. The 2-step LMS method resulted in a high enrichment efficiency even at low concentrations (10 0 –10 2 CFU/mL) of S. aureus in pure culture and blood samples. The AuNPs-based colorimetric system was applied for quantitative detection of S. aureus with a limit of detection (LOD) at 3.5 × 10 0 CFU/mL. The complete process starting with the blood samples treatment, 2-step LMS, and AuNPs-based colorimetric detection took only 7 h. The low cost and sensitive 2-step LMS combined with AuNPs-based colorimetric detection holds considerable potential for early sepsis diagnosis.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
He Yang,Xu Zhang,Junling Guo,Weili Zhu,Shupeng Zhao,Fang Wang,Qiuyu Fan,Hongyan Xiao,Fengxiang Zhang
Lithium sulfur (Li-S) battery is considered as one of promising energy-storage devices owing to its high energy density and low cost. However, it is still a great challenge to explore stable sulfur cathode with high sulfur loading and good cycling performance. Herein, we report a facile method to prepare N,S co-doped hierarchical pore structured carbon foam @porous carbon (CF@N-SPC) through a carbonation process from resin aerogel coated melamine foam with thiourea as the source for N and S codoping. The close combination of a carbon interconnected skeleton and the resin aerogel derived carbon forms the hierarchical pore structure that improves the electron and ion transport. The prepared CF@N-SPC can be used as a freestanding cathode without a conductive additive and a binder. Due to the synergistic effect of the hierarchical pore structure and N, S codoping, the sulfur loading in the carbon foam-based cathode can reach up to 10.6 mg cm −2 . Owing to these unique merits, the CF@N-SPC/S cathode exhibits high capacity and good cycling performance: it yields a discharge capacity of 1212 mA h g −1 at 0.1 C with 4.0 mg cm −2 sulfur loading; it also exhibits a good discharge capacity of 668 mA h g −1 at 0.5 C when the sulfur loading increases to 10.6 mg cm −2 , capacity retained by 72% in 200 cycles; it experiences a very small capacity decay rate of 0.05% per cycle in 700 cycles at 1 C. Our rational design and facile synthesis of the carbon foam-based freestanding cathode is promising and applicable for development of high performance Li-S batteries.
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ChemElectroChem
·
2018
·Vol. 5
·期 22
·3506-3513
·
IF 4.446
Yan-Zhen Liu,Yong-Feng Li,Shu-Xia Yuan,Shuai Chen,Cong-Wei Wang,Xiao-Ming Li,Fang-Yuan Su,Cheng-Meng Chen
Graphical Top performer : A novel method is explored to synthesize 3D N, S dual-doped porous carbons. The surface area, porosity, and surface chemistry can be tuned by heat temperature. The oxygen reduction reaction (ORR) catalysis of the as-prepared porous carbon outperforms most previously reported metal-free catalysts. The samples show high activity for the ORR, good capacitive performance, and excellent tolerance to the high concentration of methanol. Replacing rare and expensive metal electrocatalysts with efficient, low-cost, and stable ones for the oxygen reduction reactions (ORR) is of significant importance. Herein, we report a novel scalable synthesis of three-dimensional (3D) N, S dual-doped porous carbons (NSPCs) with ultrahigh surface areas that can serve as highly active, metal-free electrocatalysts for the ORR. The NSPCs are prepared by synthesizing 3D black pillar foams from a mixture containing p-nitroaniline and concentrated sulfuric acid, and subsequently carbonization under an Ar atmosphere. This method not only avoids the use of any template, but also allows for the simultaneous optimization of both porous structures and surface functionalities by tuning the carbonization temperature. Owing to the synergy of the tailored porous structure and N, S dual-doping, the NSPC pyrolyzed at 1000 °C exhibits a good catalytic activity toward the ORR with a half-wave potential of −0.10 V vs. Ag/AgCl and a high four electron (4e − ) oxygen reduction selectivity in an alkaline medium, which is identical to that of the commercial 20 wt% Pt/C catalyst, and outperforms most previously reported metal-free catalysts. The NSPCs also show good energy-storage performance for advanced supercapacitors.
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Materials Science & Engineering C-Materials for Biological Applications
·
2015
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IF 3.088
Jing Li,Lu Xu,Hongyu Wang,Baixue Yang,Hongzhuo Liu,Weisan Pan,Sanming Li
The purpose of this study was to facilely develop amino modified mesoporous silica xerogel synthesized using biomimetic method (B-AMSX) and to investigate its potential ability to be a drug carrier for loading poorly water-soluble drug indomethacin (IMC). For comparison, mesoporous silica xerogel without amino modification (B-MSX) was also synthesized using the same method. The changes of characteristics before and after IMC loading were systemically studied using fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), small angle X-ray scattering (SAXS) and nitrogen adsorption/desorption analysis. The results showed that B-MSX and B-AMSX were spherical nanoparticles with mesoporous structure. Compared with B-MSX, IMC loading capacity of B-AMSX was higher because more drug molecules can be loaded through stronger hydrogen bonding force. DSC and SAXS analysis confirmed the amorphous state of IMC after being loaded into B-MSX and B-AMSX. The in vitro drug release study revealed that B-MSX and B-AMSX improved IMC release significantly, and B-AMSX released IMC a little faster than B-MSX because of larger pore diameter of IMC-AMSX. B-MSX and B-AMSX degraded gradually in dissolution medium evidenced by color reaction and absorbance value, and B-AMSX degraded slower than B-MSX due to amino modification. In conclusion, B-AMSX with superiority of higher loading capacity and enhanced dissolution release can be considered to be a good candidate as drug carrier for IMC.
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