JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 12
·127518
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IF 4.386
Ning Dai,Guohua Shi,Tingting Li,Nan Liu,Zhongkai Xu,Zhe Chen,Xiaohong Sun,Jiefang Sun,Ruisong Guo,Chunming Zheng
Dopamine is an important neurotransmitter for organisms and affects their function, so monitoring and detecting dopamine levels are essential. Sensitivity and selectivity of electrochemical sensors for the detection of dopamine usually rely on hybrid nanocomposites. In this context, we designed a micro-regionally restricted hybrid nanocomposite by modulating the micro-nano structure. Using functional groups on nitrogen-doped reduced graphene oxide (N-rGO) to restrict the random growth of tungsten disulfide nanosheets, we obtained a 2D layered material with bidirectional structural support to achieve high specific surface and high activity for application in robust and novel dopamine electrochemical sensors. A facile electrochemical sensor for dopamine detection was fabricated by modifying a screen-printed carbon electrode with the nanocomposite. The sensor exhibits excellent performance of dopamine detection in the wide range of 1 μmol l−1–100 μmol l−1 with a detection limit of 0.2 μmol l−1 and a high sensitivity of 0.56 μA μmol−1 l−1. The optimized sensor shows a good selectivity, satisfactory long-term stability and reproducibility towards DA and a separation of peak potential of 142 mV with uric acid. In addition, the prepared sensor provides favorable recovery in human serum and artificial cerebrospinal solution (aSCF), indicating great potentials in electrochemical detection and biological sensing applications.
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CARBON
·
2019
·
IF 7.466
Lulu Chen,Yelong Zhang,Xiangjian Liu,Ling Long,Siyu Wang,Xiaolong Xu,Minchao Liu,Wenxiu Yang,Jianbo Jia
The development of transition metal nitrides/carbon hybrids with well-organized morphology, outstanding efficiency and durability for Zn-air batteries are of great urgency. Herein, a morphology-controlled strategy to efficiently fabricate uniform Co 4 N nanoparticles anchored on N -doped carbon (Co 4 N@NC-m) is reported. The diameters and distribution of Co 4 N nanocrystals can be tuned to be homogeneous profited by abundant N sources in melamine. Moreover, thanks to the advantages of higher nitrogen doping content, better electrical conductivity , higher degree of graphitization , and larger electrochemical surface area, Co 4 N@NC-m possesses excellent oxygen reduction reaction (half-wave potential of 0.87 V) and oxygen evolution reaction (overpotential of 398 mV at 10 mA cm −2 ) activities in basic solution. The Zn-air battery fabricated with Co 4 N@NC-m owns higher open circuit voltage (1.490 V), larger power density, and better rechargeability than those of the commercial IrO 2 + 20% Pt/C catalysts, which proves the potential application in practical energy conversion devices.
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CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Shouping Xu,Hao Li,Huan Ding,Zhouxiang Fan,Pihui Pi,Jiang Cheng,Xiufang Wen
Smart hydrogels with dual network were presented since a new allylated chitosan was conceived. As a double network hydrogel, its first network consisted of poly( N -isopropylacrylamide) worked as the gel matrix, and its second network with Schiff base bond enabled itself function as a molecular switch through the formation and break of the bond. When only the intestinal fluid was used, the second network could provide efficient protection for the loaded drug, and the drug release mechanism conformed to the non-Fickian type diffusion. While pre-treated with simulated gastric fluid, the switch would be opened and the mechanism was the Fickian type, which increased the cumulative percentage of drug release by about 25% and the release time by about 300 min. Besides, the hydrogel was characterized by 1 H NMR, FT-IR and SEM. The effects of allylated chitosan, pH and crosslinker on the swelling ratio and morphology of hydrogel were also studied.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
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2018
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IF 5.116
Jieting Ding,Peng Wang,Shan Ji,Hui Wang,Vladimir Linkov,Rongfang Wang
The development of low-cost bifunctional catalysts with high catalytic activity and durability for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a critical step for successful commercialization of Zn-air batteries. In this study, N-doped mesoporous carbon containing dispersed FeN x species is prepared and tested as an ORR and OER bifunctional catalyst for this battery type. Physical-chemical characterization of the newly prepared material demonstrated that NaCl can be effective as a porous structure forming template during carbonization . Resulting mesoporous structure containing FeN x species provides significant number of ORR and OER active sites. The optimized catalyst displays higher limiting current density and more positive half-wave potential for ORR than commercial Pt/C, as well as lower overpotential for OER than RuO 2 in KOH electrolyte. Furthermore, the obtained carbon material used as an air cathode in a specially assembled rechargeable Zn-air cell demonstrates electrocatalytic performance superior to those of Pt/C and RuO 2 electrodes, which makes it a promising non-precious metal bifunctional catalyst for Zn-air batteries.
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COMPOSITES COMMUNICATIONS
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2018
·
IF 0
Yufeng Bai,Zailin Gong,Chunhua Ge,Lixia Wang,Weifang Han,Xiangdong Zhang
This article reports on the fabrication of hybrid boron nitride (BN) grafted with thermoresponsive poly (N-isopropylacrylamide) (PNIPAM) and their self-flocculation effect caused by the thermal phase transition and entanglement behavior of PNIPAM. Compared with the initial BN, the PNIPAM graft BN (BN-PNIPAM) has larger area, pore volume and self-flocculation effect with rapid response to temperature. After grafting, the effective self-flocculation could be acquired in a wide concentration from 0.01 g/L to 10 g/L, the corresponding removal percentage with the phase transition is higher than 95% at high initial concentration. Furthermore, BN has a significant increase in the absorption of hydroquinone after grafting. Thermoresponsive adsorption and self-coagulation will make BN-PNIPAM recyclable in potential water restorations.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Aijiao Zhou,Wangwei Chen,Lei Liao,Pengchao Xie,Tian C. Zhang,Xumeng Wu,Xiaonan Feng
The magnetic poly( N -isopropylacrylamide)/chitosan hydrogel with interpenetrating network (IPN) structure was designed based on the functional groups of targeted emerging contaminants , represented by hydrophilic sulfamethoxazole (SMZ) and hydrophobic bisphenol A (BPA). The average particle size, specific surface area, and total pore volume of the hydrogel were turned out to be 103.7 μm, 60.70 m 2 /g and 0.0672 cm 3 /g, respectively. Adsorption results indicated that the maximum adsorption capacity occurred at the pH where SMZ was anionic and BPA was uncharged. When the adsorption temperature increased from 25 °C to 35 °C, the amount of adsorbed SMZ hardly changed, but that of BPA increased by two times. The adsorption capacity of the binary system (i.e., with both SMZ and BPA) was almost the same as that of the single system, indicating that simultaneous adsorption of SMZ and BPA was achieved. The adsorption equilibrium was reached quickly (within 5 min) for both SMZ and BPA. For adsorption isotherm, the Freundlich model fitted well for SMZ at 25, 35 and 45 °C. However, the adsorption of BPA exhibited the sigmoidally shaped isotherm at 25 °C with the Slips model fitting well, and both the Freundlich isotherm and the Slips isotherm fitted the data well at 35 °C and 45 °C, suggesting that the adsorption force was initially weak but greatly enhanced with an increase in adsorbate concentration or ambient temperature. The main adsorption mechanism was inferred to be electrostatic interactions for SMZ, and hydrophobic interactions as well as hydrogen bonding for BPA. The hydrogel adsorbent maintained favorable adsorption capacity for BPA after five adsorption-desorption cycles. These findings may provide a strategy for designing high performance adsorbents that can remove both hydrophilic and hydrophobic organic contaminants in the aquatic environment.
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PubMed
高影响因子
TALANTA
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2018
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IF 4.244
Syed Niaz Ali Shah,Xiangnan Dou,Mashooq Khan,Katsumi Uchiyama,Jin-Ming Lin
The nitrogen doped carbon dots (N-CDs) produces strong chemiluminescence (CL)-emission due to hydroxyl radical ( • OH) induced electron-hole transition in N-CDs. The Fe 2+ has the ability to generate • OH from available hydrogen peroxide (H 2 O 2 ). Therefore, a pre-mixed N-CDs/H 2 O 2 solution was utilized for selective quantification of Fe 2+ in solution via CL-emission. A linear increase in the CL-emission intensity was observed within increase in Fe 2+ concentration. The N-CDs/H 2 O 2 system enabled the detection of Fe 2+ up to lower concentration of 0.2 × 10 −9 M with a linear dynamic range of 1.0 × 10 −9 –1.0 × 10 −6 M. Significantly, no CL-emission was observed when other divalent cations , Al 3+ , Fe 3+ , or Cr 3+ were injected to this system. Moreover, no interference was observed when a mixed solution of Fe 2+ and other cations were introduced to N-CDs/H 2 O 2 . The practical evaluation of N-CDs/H 2 O 2 system was demonstrated for detection of Fe 2+ in tap, lotus pond, and canal water samples. The easy detection, high sensitivity, and selectivity make this method a significant tool for analysis of Fe 2+ in solution.
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PubMed
高影响因子
CARBOHYDRATE POLYMERS
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2019
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IF 6.044
Jing Zhang,Lingdong Chen,Biao Shen,Liqun Chen,Jie Feng
Hydrogels with good mechanical properties are promising for various applications. In this work, a simple yet effective method for preparing a novel double-network hydrogel was reported. First, nonfouling polymer, poly( N- (2-hydroxyethyl)acrylamide) (PHEAA), was crosslinked through covalent bonds. Antibacterial polysaccharide, chitosan (CS), was then crosslinked by chelation between the N- glucosamine units on the CS and citrate or sulfate ions. The poly( N- (2-hydroxyethyl)acrylamide)/chitosan double-network hydrogels (PHEAA/CS DN hydrogels) exhibited high tensile strength (3.8 MPa), strong elastic modulus (0.6 MPa). And the dynamic ionic crosslinking in CS network provided the DN gels with fast self-recovery ability as well as excellent fatigue resistance. Furthermore, the mechanical properties of the DN gels were enhanced after stretching and relaxing because of the molecular orientation and reconstruction of chitosan network. More importantly, the hydrogels have excellent antifouling and antibacterial properties, which is called “repelling and killing”, making them competitive candidates for applications in the biomedical field.
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PubMed
高影响因子
RENEWABLE ENERGY
·
2019
·
IF 5.439
Shaokai Zhang,Xun Ke,Tong Zeng,Yonghao Ni,Xiaolin Luo,Hui-Chao Hu,Lihui Chen,Liulian Huang
An ammonia-assisted headspace gas chromatography (HS-GC) method was developed to determine the N-methyl morpholine (NMM) concentration in biomass fractionation processes. The use of ammonia gas increased the detection sensitivity of NMM, and minimized the interfering effect of other substances during the analysis. Results showed that, by adding 1.5 mL ammonium hydroxide (28–30%, w/w) and a 0.125 mmol of sodium hydroxide into a 4.0 g of sample solution containing 43.3% N-methylmorpholine N-oxide (NMMO), the gas-liquid equilibration of NMM was obtained within 30 min at 80 °C. The optimum sample size and the NMMO content in the sample solutions were 6.0 g and 43.3%, respectively. The present method was proved to be of high precision (RSD = 4.33%), sensitivity (LOQ = 71.9 mg/kg), and with recovery accuracy of 96.0–102%. The present method was rapid, accurate, which will be a powerful tool to optimize the reaction conditions in NMMO-based biomass pretreatment process for enhancing the cost effectivity.
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ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2019
·
IF 3.327
Cuiling Wang,Xiao Bai,Rui Wang,Xudong Zheng,Xiumei Ma,Huan Chen,Yun Ai,Yajun Bai,Yifeng Liu
A new method for imatinib synthesis is described by using the C–N coupling reaction of 4-(4-methylpiperazine-1-methyl)benzamide with N-(5-bromo-2-tolyl)-4-(3-pyridyl)pyrimidin-2-amine to form imatinib. In this synthetic route, the high efficiency and high selectivity of nano-ZnO as a catalyst is key to the mild hydrolysis of 4-(4-methylpiperazine-1-methyl)benzonitrile into the corresponding amide. The total imatinib yield was 51.3%, and the purity was 99.9%. This simple and effective synthetic pathway avoids gene-impurity production (as classified by the FDA Center for Drug Evaluation and Research), and the synthesis is environmentally friendly with a short reaction time.
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APPLIED CATALYSIS A-GENERAL
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2019
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IF 4.63
Wei Qian,Lina Lin,Yunxiang Qiao,Xiuge Zhao,Zichen Xu,Honghui Gong,Difan Li,Manyu Chen,Rong Huang,Zhenshan Hou
The N-doped carbon layer coated SBA-15 support has been accomplished via a pyrolysis process . The ultra-low loading Ru nanoparticles ( ca. 0.1 wt.%) was incorporated into the support by impregnation and the sequential reduction. The images of HAADF-STEM revealed that the Ru particles with sub-1-nm size (0.2-0.7 nm) were uniformly dispersed on the support. The ultrafine Ru particles displayed the excellent activity for the hydrogenation of olefins , arenes, phenol derivatives and heteroarenes in aqueous phase. The aliphatic or alicyclic compounds were produced selectively without the hydrogenolysis of C O and C N bonds. The high turnover frequency (TOF) values can reach up to 10,000 h −1 . Notably, the activity of these catalysts improved dramatically with decreasing the sizes of Ru particles. Meanwhile, the N-doped carbon layer coating endowed the high stability of the Ru catalysts and prevented the leaching of the Ru species owning to the strong interaction between doped-N atoms and the ultrafine Ru particles. Overall, this work provides a highly attractive strategy to construct the supported sub-1-nm Ru particles utilized for the aqueous hydrogenation.
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高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 14
·3764-3773
·
IF 3.975
Hui Liu,Hao Guo,Liguo Yue,Ning Wu,Qi Li,Wenqin Yao,Rui Xue,Mingyue Wang,Wu Yang
Graphical Turn the red light on : A series of NiS 2 /CoS 2 /NC- T composited is developed by carbonizing and sulfuring a binary precursor of Ni/Co-metal-organic framework. The composite NiS 2 /CoS 2 /NC-500 maintains the rod-like structure of the precursor and exhibits a high specific capacitance. An assembled asymmetric supercapacitor (ASC) NiS 2 /CoS 2 /NC-500//AC displays a high energy density and good cycle stability with high capacitance retention. A red LED can be illuminated by the assembled ASC. Transition metal sulfides derived from metal-organic frameworks (MOFs) have received increasing attention as a potential energy storage electrode material. Here, a series of NiS 2 /CoS 2 /NC- T ( T =temperature) have been successfully constructed by carbonizing and sulfuring the precursor of Ni/Co-MOF. It is worth emphasizing that N-doped carbon materials improve the conductivity of the electrode material. Moreover, NiS 2 /CoS 2 /NC-500 maintains the rod-like structure of the precursor and exhibits a high specific capacitance of 1325 F g −1 at a current density of 1 A g −1 . Apart from high capacitance, the NiS 2 /CoS 2 /NC-500 also demonstrated excellent cycling stability with retention rate of 75 % after 5000 cycles at a current density of 5 A g −1 . The good performance could be attributed to the unique rod-like structure and pore-size distribution of NiS 2 /CoS 2 /NC-500. Moreover, an assembled asymmetric supercapacitor NiS 2 /CoS 2 /NC-500//AC displays a high energy density of 53.93 Wh kg −1 at a power density of 800 W kg −1 and good cycle stability with capacitance retention of 85.71 % after 20,000 cycles at 5 A g −1 . In particular, a red LED can be illuminated by the assembled ASC, indicating that as-synthesized NiS 2 /CoS 2 /NC-500 hold great potential for practical applications.
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危险品化学品经营许可证（带存储）