ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Tan Dang,Donghai Wei,Guiqing Zhang,Lei Wang,Qinggang Li,Huaizhi Liu,Zuoying Cao,Guanhua Zhang,Huigao Duan
Rational design of highly active electrode materials made of low-cost and earth-abundant transition metal phosphides is essential to boost the energy density and overall performance of electrochemical capacitors. In this work, homologous 3D NiCoP/CoP hetero-nanosheets network supported on N-doped carbon nanotubes are synthesized through one-step phosphorization of nickel cobalt hydroxide. The synergistic effects between NiCoP and CoP in the heterointerface are studied systematically through tuning the molar ratio of original Ni/Co. As a result, the optimized N-CNTs@NiCoP/CoP (with the Ni/Co ratio of 1:2) reveals a remarkable specific capacity of 152 mAh g −1 at 1 A g −1 and a superior rate capability with a capacity retention of 61% even at 30 A g −1 . A hybrid supercapacitor assembled with N-CNTs@NiCoP/CoP cathode and ZIF-67-derived porous carbon anode exhibits a high energy density of 45.5 Wh kg −1 at power density of 784 W kg −1 and excellent stability of 87% retention after 10,000 cycles at 12 A g −1 . Such excellent electrochemical performance of N-CNTs@NiCoP/CoP is mainly ascribed to the strong synergistic effect between NiCoP and CoP in their heterojunctions, enlarged surface area and active sites due to the 3D nanosheets network and conductive N-CNTs support.
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2020
·Vol. 78
·期 2
·753-768
·
IF 2.014
Wu Jie,Zhai Wentao,Gao Xue,Liu Bingxin,Zhang Ruling,Yu Yueqin
Well-defined triblock copolymers poly( N -isopropylacrylamide)-b-poly(3-methacryloxypropyltrimethoxysilane)-b-poly( N -isopropylacrylamide) (PNIPAM-b-PMEMO-b-PNIPAM) with varying block ratios were successfully synthesized via reversible addition–fragmentation chain transfer polymerization. The amphiphilic triblock copolymers showed surfactant-like behavior in aqueous solution and could easily self-assemble into dendritic micelles with hydrophobic PMEMO as the core and hydrophilic PNIPAM as the shell when the copolymer concentration exceeded the critical micelle concentration (CMC). Transmittance measurements showed the triblock copolymers were thermosensitive, and it was worth noting that the lower critical solution temperature (LCST) values of copolymers exceeded pure PNIPAM to about 35.3 °C, which was very close to physiological temperature of human body. This was attributed to the effect of Si–O–CH 3 hydrolysis in polymers. The effect of a series of inorganic salts on thermosensitivity of PNIPAM-b-PMEMO-b-PNIPAM was investigated, and our results suggested that the block copolymers maintained good thermosensitivity in all salt solutions. The LCST did not change significantly in different concentrations of NaCl, CaCl 2 and MgCl 2 solutions, which proved the polymer had good salt resistance. Dynamic light scattering experiments showed that the micelles were well dispersed at about 120 nm below LCST with a small polydispersity index. In addition, the drug-loading experiments of micelles showed high drug encapsulation efficiency indicating their potential as drug carriers.
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2020
·
IF 4.679
Zengqiang Li,Yige Yu,Yang Li,Feifei Ma,Yinghui Fang,Chaobo Ni,Keyang Wu,Peipei Pan,Ren-Shan Ge
Di-n-butyl phthalate (DBP) is widely used in consumer products as a plasticizer . Here, we report a natural product taxifolin that can attenuate developmental and reproductive toxicity of DBP. Pregnant rats were daily gavaged with 500 mg/kg DBP alone or together with taxifolin (10 and 20 mg/kg) from gestational day (GD) 12–21. At GD21, sera and testes of male fetus were collected. DBP significantly lowered serum testosterone level at 500 mg/kg and taxifolin can completely reverse its action. DBP caused abnormal aggregation of fetal Leydig cells and taxifolin can reverse it. DBP down-regulated the expression of the genes of cholesterol side-chain cleavage enzyme ( Cyp11a1 ), 17β-hydroxysteroid dehydrogenase 3 ( Hsd17b3 ), and insulin-like 3 ( Insl3 ) and taxifolin can reverse its action. DBP increased malondialdehyde levels and decreased superoxide dismutase and glutathione peroxidase expression and taxifolin can reverse it. DBP increased incidence of multinucleated gonocytes and taxifolin can prevent it. Moreover, DBP lowered sirtuin 1 (SIRT1)/peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α) and phosphorylated AMP-activated protein kinase (pAMPK) signalling and taxifolin antagonized DBP. In conclusion, in utero exposure to DBP caused developmental/reproductive toxicity of male offspring via increasing reactive oxygen species and taxifolin is an effective food component that completely reverses DBP-mediated action.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Tao Jiang,Weiling Luan,Yufeng Ren,Chenyao Fan,Qi Feng,Lyudmila Turyanska
Exploring an economical and efficient oxygen reduction reaction (ORR) is an essential but challenging field of study. Metal–organic frameworks (MOFs) have emerged as promising candidates for the preparation of porous catalysts. Here we propose a synergistic heat treatment (SHT) method to synthesize Fe–N–C-SHT catalyst with hierarchical porous hollow structures via a simple carbonization method by the synergistic heating of ZIF-8-Fe (ZIF-8 doped with Fe) and ZIF-67 in a tube furnace. Fe–N–C-SHT catalyst displays efficient ORR activity (half-wave potential ( E half ) = 0.88 V versus reversible hydrogen electrode (RHE) with a loading of 0.204 mg Fe-N-C-SHT cm −2 ), which is superior to that of Fe–N–C synthesized using individual heat treatment (IHT) ( E half = 0.84 V) and Pt/C catalyst ( E half = 0.86 V). We achieve enhanced catalytic properties, enhanced methanol tolerance, and long-term durability of the Fe–N–C-SHT catalyst in alkaline electrolyte . The improved ORR activity is attributed to the synergistic effect of Fe doping and optimized SHT methodology, which led to the formation of a highly porous catalyst with numerous active sites. The developed SHT method presents a novel route to fabricate Fe–N–C catalysts with hollow-mesoporous-microporous structures and high performance in ORR.
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Chengzhi Zhang,Donghai Wei,Fei Wang,Guanhua Zhang,Junfei Duan,Fei Han,Huigao Duan,Jinshui Liu
Nanostructured iron sulfides are regarded as a potential anode material for sodium-ion batteries in virtue of the rich natural abundance and remarkable theoretical capacity. However, poor rate performance and inferior cycling stability caused by sluggish kinetics and volume swelling represent two main obstacles at present. The previous research mainly focuses on nanostructure design and/or hybridizing with conductive materials. Further boosting the property by adjusting Fe/S atomic ratio in iron sulfides is rarely reported. In this work, Fe 7 S 8 and FeS 2 encapsulated in N-doped hollow carbon fibers (NHCFs/Fe 7 S 8 and NHCFs/FeS 2 ) are constructed by a combined chemical bath deposition and subsequent sulfidation treatment. The well-designed NHCFs/Fe 7 S 8 electrode displays a remarkable capacity of 517 mAh g −1 at 2 A g −1 after 1000 cycles and a superb rate capability with a capability of 444 mAh g −1 even at 20 A g −1 in ether-based electrolyte. Additionally, the rate capability of NHCFs/Fe 7 S 8 is superior to that of the contrast NHCFs/FeS 2 electrode and also much better than the values of the most previously reported iron sulfide-based anodes. The in-depth mechanism explanation is explained by further experimental analysis and theoretical calculation, revealing Fe 7 S 8 displays improved intrinsic electronic conductivity and faster Na + diffusion coefficient as well as higher reaction reversibility.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 7
·4064-4070
·
IF 3.119
Yingna Chang,Qidong Dang,Imran Samo,Yaping Li,Xuejin Li,Guoxin Zhang,Zheng Chang
The removal of heavy metal contaminants has aroused global attention due to water shortage and the lax control on the discharge of heavy metal pollutants. Capacitive deionization (CDI) has emerged as a robust, energy-/cost-efficient technique for water treatment. Herein, we reported the simple synthesis of N, S-co-doped carbon materials (NS-C) derived from PVC plastic wastes as CDI electrode materials for the efficient removal of heavy metal ions (HMIs). The NS-C exhibited a large specific surface area (∼1230 m2 g−1) and contained heavy heteroatom doping (∼4.55 at% N and ∼13.30 at% S). The CDI electrode fabricated using NS-C showed high removal efficiency (94–99%), high capacity (36–62 mg g−1), and good regeneration capability for the adsorption of various kinds of low-concentration heavy metal ions (including Fe2+, Co2+, Ni2+, Cu2+, Pb2+, and Cd2+). Moreover, PVC plastic wastes that are heavily accumulated in the environment and extremely hard to be decomposed and recycled were applied as the carbon source in this study for the fabrication of NS-C, which further rendered the importance of our study in practically treating hazardous waste (HMIs) with waste (PVC plastic wastes) in a clean and efficient way.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 3
·745-752
·
IF 4.154
Pan Wang,Ji Qi,Chuang Li,Xiao Chen,Tonghua Wang,Changhai Liang
Graphical One for all : A new strategy is used to grow N-doped carbon nanotubes encapsulating Ni/MoN heterostructures on carbon cloth, exhibiting highly active and stable for overall water splitting, which originates from the high intrinsic activity in the interface of the Ni/MoN heterostructures, the high conductivity and protection of carbon nanotubes, and the three-dimensional structure of the Ni/MoN@NCNT/CC. Herein, we reported a new strategy to grow N-doped carbon nanotubes encapsulating Ni/MoN heterostructures on carbon cloth (Ni/MoN@NCNT/CC). The high intrinsic activity in the interface engineering of the Ni/MoN heterostructures, the high conductivity and protection of NCNT, and the three-dimensional structure of the Ni/MoN@NCNT/CC contribute to its outstanding activity and stability for HER (overpotential of 207 mV at 10 mA cm −2 ) and OER (overpotential of 252 mV at 10 mA cm −2 ). Particularly, for HER, it can maintain a consistent potential at 100 mA cm −2 for 100 h. Besides, for OER the generated surface roughness and larger surface area can enhance OER activity of the catalyst. When used as a bifunctional electrocatalyst for overall water splitting, it can achieve a current density of 10 mA cm −2 at a cell voltage of 1.699 V with excellent durability. This work provides a new strategy to fabricate three-dimensional heterostructured water-splitting electrocatalysts with large surface area.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Ming Chen,TrungHieu Le,Yuanxiang Zhou,Feiyu Kang,Ying Yang
Developing advanced carbon nanomaterials with reasonable pore distribution and interconnection and matching the charge-storage capacities and electrode kinetics between the capacitive electrode and the battery-type electrode are two of the biggest challenges in lithium-ion capacitors (LICs). In this work, a sustainable strategy to fabricate N/S dual-doped hierarchical porous carbon nanofibers (N/S-CNF) is developed via electrospinning and thiourea treatment, and the N/S-CNF is employed as both the capacitor-type cathode and the battery-type anode for LICs. With rational design, N/S-CNF can not only offer a large specific surface area with a hierarchical pore structure but also be uniformly doped with heteroatoms, which is desirable for improving the electrochemical performance of both the cathode and the anode for LICs and alleviating the mismatch between the two electrodes. LICs assembled with the designed N/S-CNF electrodes can deliver a high energy density of 154 Wh kg–1 with a stable capacitance retention of 92% after 6000 cycles. Our work is expected to open up new avenues for developing heteroatom-doped porous carbon nanomaterials applied in other energy conversion and storage devices.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Jianhui Jia,Jianbo Chen,Huan Ding,Xianggui Xue,Shichun Li,Jichun Huang,Yu Liu
N- oxide based explosives display better explosive performances than traditional explosives, because of the introduction of N- oxide group with strong hydrogen bonding (H-bonding). However, the strong H-bonding results in poor dissolution of N- oxide based explosives, and thus poses a significant challenge for their potential applications. Deep eutectic solvents (DESs), a new generation of green solvents, display promising dissolution toward strong H-bonding materials in recent years. In this study, 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) was used as a prototype of N- oxide based explosives to study the dissolution in DESs. The dissolution conditions for LLM-105 were optimized by using different types of DESs. The DES-3 - 2 based on choline chloride and urea displayed higher dissolving capacity with 0.52 g/100 g at 80 °C, which was determined by traditionally gravimetric method. Further, the dissolution process of LLM-105 in DES-3 - 2 under different temperatures was investigated by comprehensive analysis including ultra-high-performance liquid chromatography, high-resolution mass spectrum and theoretical calculations. The dissolution of LLM-105 under ≤80 °C was demonstrated to be real dissolution referring to the formation of Zundel-type complex and Meisenheimer complex between DES-3 - 2 and LLM-105. Abnormally high solubility of LLM-105 at >80 °C was attributed to the self-collapse of its H-bonding network by losing a nitro group and an oxygen of N- oxide group.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Huaying Hou,Zhongxu Wang,Yajie Ma,Kai Yu,Jingxiang Zhao,Huiming Lin,Fengyu Qu
The intracellular O 2 -supply not only can relieve tumor hypoxia but also enhance the effects of photodynamic therapy (PDT). In this work, metallic Mo 2 [email protected] N [email protected] nanoparticles were constructed to reveal the near infrared (NIR)-photocatalytic O 2 generation and promote photodynamic therapy (PDT). Here, (NH 4 ) 6 Mo 7 O 24 ·4H 2 O nanorods and urea were adopted as resources that were calcined to obtain Mo 2 [email protected] N -carbon nanoparticles (20 nm). All samples displayed high NIR absorption as well as photothermal conversion efficiency of up to 52.7 % (Mo 2 [email protected] N [email protected] ). The density functional theory calculations demonstrated the metallic characteristic of Mo 2 C and that the consecutive interband/intraband charge-transition was responsible for the high NIR harvest and redox ability of electron-hole pairs, making the NIR-photocatalytic O 2 and reactive oxygen species (ROS) generation. In comparison with the pure Mo 2 C, the heterostructure displayed twice the performance due to the enhanced charge-segregation between Mo 2 C and N -carbon. Given the high X-ray absorption coefficient and photothermal ability, the nanocomposite could be used in novel computer tomography and photothermal imaging contrast. Furthermore, the novel biodegradation and metabolism behaviors of nanocomposites were investigated, which were reflected as elimination from the body (mouse) via feces and urine within 14 days. The as-synthesized Mo 2 [email protected] N [email protected] nanocomposites integrated the dual-model imaging, intracellular O 2 -supply, and phototherapy into one nanoplatform, revealing its potential for anti-cancer therapy.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xueping Sun,Peng Wei,Jinxu Zhang,Songqi Gu,Ruoou Yang,Chun Fang,Qing Li,Jiantao Han,Zheng Jiang,Jianhua He
Integrating the unique metalloid behaviour of monometallic phosphides and modified local electronic/geometric structures of active sites, bimetallic phosphides have emerged as promising candidates for water splitting reaction, but they are still synthesized by toxic, corrosive, and high-temperature methods, which inevitably resulted in an increase of particle size and the decrease of catalytic activity area. Herein, the ultra-fine bimetallic NiCoP catalysts in-situ embedded in P, N-codoped carbon nanofibers (NiCoP@PNCNF) were successfully fabricated via a facile electrospinning method with the help of phytic acid. Profiting from the unique macro-structural design and micro-electronic/geometric modification, as-prepared NiCoP@PNCNF catalysts exhibited excellent catalytic performance both for HER (η 10 = 98 mV) and OER (η 10 = 260 mV) in terms of the low overpotential and robust stabilities in alkaline solution. Meanwhile, XAFS analysis further demonstrated that the remarkable catalytic performance not only attributed to the introduction of heteroatom-doped carbon fibers as their improvements in the corrosion resistance, anti-agglomeration abilities, and conductivity, but also benefited from the local electronic/geometric structure alternations as the strong synergic effects between Ni/Co and P atoms. For practical application, the water splitting performance based on NiCoP@PNCNF electrodes was also investigated and exhibited a lower splitting potential (E J=10, 1.645 V) over long-term stability tests. These insightful findings undoubtedly shed light on the design and fabrication of cost-effective and robust bifunctional transition-metal phosphides electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2021
·
IF 3.205
Lei Feng,Xianyu Liang,Xuejin Mao,Hao Wan,Yan Wu,Quanbin Han
N-phenylglycine (NPG) in human urine could be an important biomarker for predicting cancers, but its detection has difficulty due to its low abundance in urine. Herein, we report a molecular imprinted polymer (MIP) method to efficiently recognize NPG in urine. The MIP was prepared by precipitation polymerization, adopting NPG as the template, acrylamide (AM) as functional monomer, trimethylpropane triacrylate (TRIM) as crosslinking agent, and acetonitrile as porogen. The specificity and selectivity of MIP towards NPG in human urine were determined by comparing MIP's adsorption to the NPG and N-crotonylglycine (NTG) under the same conditions. The result β = Q MIP-NPG / Q MIP-NTG = 4.7 indicated the satisfactory specificity and selectivity. Parameters affecting the extraction efficiency were further optimized. Under the optimum conditions, the linear range, limit of detection, and limit of quantification of NPG were 0.5–100 mg∙L −1 , 1.6 × 10 −2 mg∙L −1 , and 5.5 × 10 −2 mg∙L −1 , respectively. Recoveries of NPG in human urine were in the range of 84.7–100.0% with RSD S of 3.8–10.8%. The developed method demonstrated superior selectivity to the target analyte, which can be applied to separate and enrich the NPG from urine samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）