JOURNAL OF CATALYSIS
·
2017
·
IF 6.844
Kun Zhao,Yan Su,Xie Quan,Yanming Liu,Shuo Chen,Hongtao Yu
Electrochemical synthesis of hydrogen peroxide (H 2 O 2 ) via two-electron pathway of oxygen reduction reaction is a promising alternative to the current anthraquinone process. The H 2 O 2 production from O 2 is a competing reaction with four-electron O 2 reduction to H 2 O, and the selectivity is related to the adsorption energy of the OOH intermediate on electrocatalysts surface. Generally, the properties for binding of OOH intermediate on catalysts can be controlled by changing its electronic structure. Herein, the electronic structure of porous carbon materials was tuned by doping different types and contents of fluorine species. The yield of H 2 O 2 generation depended on the F content and the best catalytic activity toward H 2 O 2 electrosynthesis was obtained with F content of 3.41 at.%. The resultant F-doped porous carbon (FPC) catalysts exhibited good H 2 O 2 selectivity of 97.5–83.0% and the H 2 O 2 production rate could reach 112.6–792.6 mmol h −1 g −1 over the potential range of 0.2 V to −0.3 vs. RHE (pH 1). The density functional theory (DFT) calculations and experiments revealed that the incorporation of CF 2, 3 into carbon plane promotes the activation of O 2 molecule and facilitates desorption of OOH intermediate, which was crucial to H 2 O 2 synthesis.
研究领域:
材料科学
·
电化学
·
环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2019
·
IF 4.916
Yue Du,Yonghai Song,Juan Hao,Keying Cai,Nan Liu,Li Yang,Li Wang
A novel ratiometric fluorescent sensor for superoxide radical (O 2 •− ) detection was developed based on Schiff base polymer (SBP)/rhodamine-B (SBP/RDB) nanocomposites. The SBP/RDB was investigated by atomic force microscopy , scanning electron microscopy, transmission electron microscopy , X-ray powder diffraction, Fourier transform infrared spectroscopy, N 2 adsorption/desorption isotherms and fluorescence spectroscopy, etc. The results showed the SBP was two-dimensional (2D) crystalline nanosheet with the thickness of 0.5 nm. RDB could be self-assembled on each of 2D SBP surface to form SBP/RDB due to the hydrogen bond between N atoms of SBP and –COOH of RDB as well as π-π interaction. The SBP/RDB exhibited the characteristic fluorescence emission of both SBP at 485 nm and RDB at 585 nm under an excitation of 270 nm. The 2D SBP was not only acted as template to assemble RDB, but also used as reference fluorescence for O 2 •− detection. The SBP/RDB fluorescence probe for O 2 •− detection demonstrated high sensitivity and selectivity with good linear range (11.1 ± 0.76 nM–8.0 ± 0.36 μM) and low detection limit (3.7 ± 0.42 nM). Because of the low cost and simple operation, the work sheds some new light to construct ratiometric fluorescent sensors based on SBP to detect O 2 •− in drinking water and human blood serum for commercial applications.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2019
·
IF 2.739
Md Mehedi Hasan,Feichao Zhu,Arsalan Ahmed,Nazakat Ali Khoso,Hridam Deb,Lai Yuchao,Md Zahidul Islam,Hui Sun,Bin Yu
Melt blown-Nonwoven Polypropylene based materials have numerous applications, such as nonwoven fabrics, filtration membranes used in clothing and potential industrial use due to its higher breathability, durability, absorbency, and filtration properties. Nonwoven PP-fabrics are very often used to develop wearable articles such as garments. In this research melt blown-nonwoven polypropylene (NW-PP) membranes were functionalized using (O 2 ) cold plasma for the conversion of highly hydrophobic into hydrophilic nature to enhance the absorption and adhesion of graphene films on the fiber surface. The graphene oxide (GO) and NW membrane was successfully introduced on the fibrous mat and reduced into reduced Graphene oxide (rGO) with green chemical and thermal reduction. L-Ascorbic Acid was used as a reducing agent at a low-temperature microwave-assisted reduction at 90 °C. The as developed NW membrane was connected two copper electrodes and used as wearable pressure (WP) sensors. The physical sensor responds with different stretching and bending cycles under dynamic pressure of loading and unloading. The sensitivity of the developed pressure sensor was 0.050 kPa −1 in a wide pressure range (0–60 kPa). The resultant rGO coated NW-PP wearable pressure sensor (RNPWP) is capable of responding to human body movement and motion. The study demonstrates that mass production on an industrial scale graphene-based conductive nonwoven PP fabric potentially replaces the metal-based conductive wearable textiles for physical sensors.
研究领域:
材料科学
·
纺织工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jia Liu,Jinshuo Qiao,Hong Yuan,Jie Feng,Chao Sui,Zhenhua Wang,Wang Sun,Kening Sun
Ni modified Ce 0.6 Mn 0.3 Fe 0.1 O 2 (Ni-CMF) material is evaluated as an anode material for hybrid direct carbon fuel cell (HDCFC). The Temperature Programmed Reaction (TPR) and GC test results show that the Ni additive significantly promotes the oxidation of carbon and consequently accelerates the formation rate of CO. Moreover, the Ni-CMF material is found to show a high electrical conductivity compared to pure CMF in HDCFC operating conditions. Taking advantage of the excellent catalytic activity and high conductivity, the electrolyte-supported HDCFC with Ni-CMF anode shows a high maximum power density of 580.7 mW cm −2 at 800 °C, when activated carbon is used as the fuel. Furthermore, the cell displays good stability under galvanostatic operation at current density of 50 mA cm −2 at 750 °C. These results indicate that the designed Ni-CMF composite material has the potential to be developed as an alternative anode for HDCFCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2013
·
IF 5.695
Lu-Lu Qu,Da-Wei Li,Li-Xia Qin,Jin Mu,John S. Fossey,Yi-Tao Long
A novel surface-enhanced Raman scattering (SERS) nanosensor was developed by modifying oxidized cytochrome c (Cyt c) on gold nanoparticles (Au NPs) for the sensitive and selective determination of intracellular superoxide anion radical (O2•–). On the basis of the differences in the SERS spectra between the oxidized and reduced form of Cyt c, this nanosensor could be employed to investigate O2•– concentration by measuring the SERS spectra of the reduced Cyt c. Using this SERS nanosensor, a detection limit of 1.0 × 10–8 M for O2•– could be attained. Additionally, the selectivity of the SERS nanosensor for O2•– was examined, showing that other reactive oxygen species (ROS) and biologically relevant species did not influence the detection of O2•–. More importantly, the nanosensor could be delivered to the living HeLa and normal human liver cells and permitted the concentration of O2•– to be monitored in real time and in a noninvasive manner, which indicates that this nanosensor will be suitable for the qualitative and quantitative analysis of O2•– in biosystems, thus leading to a greater understanding of oxidative-stress-related diseases at a cellular level.
研究领域:
生物化学
·
分析化学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2019
·Vol. 12
·期 21
·3515
·
IF 2.972
Binqing Sun,Lixin Lu,Yong Zhu
The diffusion of five flavor organic molecules, including D-limonene, myrcene, ethyl hexanoate, 2-nonanone, and linalool in low density polyethylene (LDPE) film were investigated by combined experimental and molecular dynamics (MD) simulation studies. The diffusion coefficients derived from the prediction model, experimental determination, and MD simulation were compared, and the related microscopic diffusion mechanism was investigated. The effects of the presence of the flavor organic molecules on the diffusion of O2and H2O in polyethylene (PE) were also studied by MD simulation. Results show that: The diffusion of five flavor molecules in LDPE is well followed to Fick’s second law by the immersion experiment; MD simulation indicates the dual mode diffusion mechanism of the flavor molecules is in LDPE; the diffusion coefficients from MD simulation are close to those from the experimental determination, but are slightly larger than those values; the presence of the flavor organic molecules hinders the diffusion of O2and H2O, which can be well explained from the fraction of free volume (FFV) and interaction energy calculation results derived from MD simulation.Keywords:flavor organic molecules;LDPE film;molecular dynamics simulation;diffusion
研究领域:
材料科学
·
化学工程
·
高分子科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chun-xian Zhou,Peng-bo Wang,Bao Zhang,Lin-bo Tang,Hui Tong,Zhen-jiang He,Jun-chao Zheng
Li-rich cathode materials are regarded as ideal cathode materials, owing to their excellent electrochemical capacity. However, residual lithium compounds, which are formed on the surface of the materials by reacting with moisture and carbon dioxide in ambient atmosphere, can impair the surface structure, injure the capacity, and impede the electrode fabrication using Li-rich materials. Exposure to air atmosphere causes the formation of residual lithium compounds; the formation of such compounds is believed to be related to humidity, temperature, and time during handling and storage. In this study, we demonstrated for the first time an artificial strategy for controlling time, temperature, and humidity to accelerate exposure. The formation and effect of residual lithium compounds on Li-rich cathode material Li1.35[Ni0.35Mn0.65]O2 were systematically investigated. The residual lithium compounds formed possessed primarily an amorphous structure and were partially coated on the surface. These compounds include LiOH, Li2O, and Li2CO3. Li2CO3 is the major component in residual lithium compounds. The presence of residual lithium compounds on the material surface led to a high discharge capacity loss and large discharge voltage fading. Understanding the formation and suppressing the effect of residual lithium compounds will help prevent their unfavorable effects and improve the electrochemical performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Zepeng Kang,Yuanming Wang,Haiyan Song,Xueli Wang,Yi-Heng P. Job Zhang,Zhiguang Zhu
The performance of biocathode in an enzymatic biofuel cell (EBFC) in the real application is somehow overlooked. Herein, a wearable and flexible lactic-acid/O 2 EBFC enhanced with an air-breathing biocathode is designed to solve the limitation of biocathode that arises from the low solubility and slow mass transfer of the dissolved oxygen. To improve the oxygen supply efficiency for the air-breathing biocathode, a superhydrophobic base electrode creating an efficient air-solid-liquid triphase interface is developed. The designed EBFC with an ‘island-bridge’ configuration is integrated by assembling the current collectors of air-breathing biocathode and bioanode on a commercial laminating film (LF) screen-printed with a noninterfering circuit. It is found that the biocathode/bioanode area ratio should exceed 9:1 so that the designed EBFC (1A//9C) can achieve the optimal performance. This EBFC delivers an open circuit voltage of ca. 0.75 V and outputs a maximum power density of ca. 1.78 mW cm −2 . In addition, a scaled-up EBFC (total bioanode area: 1.5 cm 2 ) successfully powers a self-developed low-power device of heartrate in the pulse operation mode when applied on a volunteer's arm.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xiaohui Wang,Yuanxiangyi Feng,Zhe Li,Jinhua Liu,Dandan Sun,Wei Yang,Xiaowei Xing,Wenjun Liu,Hongxin Zhang
A fluorescent capillary sensor for detecting the bioanalytically and biologically relevant analytes pH, O 2 , and CO 2 has been designed. The sensor is based on single capillary tube with 2 mm inner diameter, which is simultaneous doped with emissive O 2 -sensitive indicator Ru(dpp) 3 (PF6) 2 (RuDP), pH-sensitive and CO 2 -sensitive indicator 8-hydroxypyrene-1, 3,6-trisulfonic acid trisodium salt (HPTS). The multifunctional sensor can be excited at the same wavelength and realize multi-parameter optical monitoring at the different sensing position. Studies in phosphate-buffered solutions display the excellent feasibility of the capillary sensor for fluorescence detection of pH, O 2 , and CO 2 . Overall, the multifunctional capillary sensor exhibits great potential in real-time blood gas analysis, and clinical application of multi-parameter biological detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Guiru Sun,Zexu Zhang,Daming Yang,Yan Wang,Wei Lu,Mei Liu,Ming Feng
Li metal is considered as an ideal anode for Li-O 2 batteries because of its unbeatably theoretical specific capacity and low electrode potential. Unfortunately, the growth of Li dendritic and the sensitivity to electrolyte and O 2 hinder the practical applications of Li anode. Herein, AlF 3 as an electrolyte additive is firstly employed in a Li-O 2 battery, which can boost the formation of LiF@Al-Li@Al 2 O 3 -rich SEI film via in-situ spontaneous reactions of AlF 3 with Li anode in O 2 atmosphere. The generated SEI film contributes to inducing the homogeneous nucleation of Li and reducing the disgusting side reactions, which can suppress the growth of Li dendrite and improve the cyclability of Li anode. Benefiting from the rational design, both the Li-O 2 and the Li|Li symmetric batteries with AlF 3 electrolyte exhibit low overpotential and good cycling stability. We hope this work could provide a facile way to in-situ construct a stable SEI film to alleviate the uneven Li nucleation for Li-O 2 batteries.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2022
·
IF 6.51
Yan Liang,Ping-Yu Wang,You-Jie Li,Ze-Yun Liu,Ran-Ran Wang,Guang-Bin Sun,Hong-Fang Sun,Shu-Yang Xie
Reduced drug uptake and elevated drug efflux are two major mechanisms in cancer multidrug resistance (MDR). In the present study, a new multistage O 2 -producing liposome with NAG/R8-dual-ligand and stimuli-responsive dePEGylation was developed to address the abovementioned issues simultaneously. The designed C-NAG-R8-PTXL/MnO 2 -lip could also achieve magnetic resonance imaging (MRI)-guided synergistic chemodynamic/chemotherapy (CDT/CT). In vitro and in vivo studies showed that C-NAG-R8-PTXL/MnO 2 -lip enhanced circulation time by PEG and targeted the tumor site. After tumor accumulation, endogenous l -cysteine was administered, and the PEG-attached disulfide bond was broken, resulting in the dissociation of PEG shells. The previously hidden positively charged R8 by different lengths of PEG chains was exposed and mediated efficient internalization. In addition, the oxygen (O 2 ) generated by C-NAG-R8-PTXL/MnO 2 -lip relieved the hypoxic environment within the tumor, thus reducing the efflux of chemotherapeutic drug. O 2 was able to burst liposomes and triggered the release of PTXL . The toxic hydroxyl radical (·OH), which was produced by H 2 O 2 and Mn 2+ , strengthened CDT/CT. C-NAG-R8-PTXL/MnO 2 -lip was also used as MRI contrast agent , which blazed the trail to rationally design theranostic agents for tumor imaging.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yilin Yang,Ning Wang,Zhihua Wang,Mingda Han,Fei Yan,Zhan Shi,Shouhua Feng
Sonodynamic therapy (SDT) has emerged as a promising strategy for treating tumors owing to its non-invasiveness and high tissue-penetrating depth. Improving the efficiency of electron-hole separation of sonosensitizers and alleviation of the hypoxic tumor microenvironment remain major challenges. Metal-organic frameworks (MOFs) have greatly potential in SDT application, however, exploring new sonosensitizers with high reactive oxygen species (ROS) generation and improving the efficacy through a synergistic effect in combination with other therapeutic modalities remain major challenges. Furthermore, the immunosuppressive tumor microenvironment (TME) is characterized by hypoxia, which limit the efficacy of O 2 -dependent cancer treatments including SDT and immunotherapy. Herein, we fabricated a defect-rich titanium-based MOFs using propionic acid-mediated self-templated hierarchical etching. Reductive platinum nanoparticles were embedded onto the surface of MOFs to enhance the spatial separation of electron-hole pairs and improve the quantum yield of ultrasound-generated singlet oxygen ( 1 O 2 ). Finally, perfluorobromooctane was encapsulated in the MOFs to function as an oxygen carrier to develop an oxygen self-feeding nanosensitizer. In vitro and in vivo assays demonstrated that this nanoplatform could produce high levels of 1 O 2 under ultrasound irradiation, which led to enhanced SDT. Moreover, this nanoplatform also relieved the immunosuppressive TME by overcoming hypoxia and enhancing immunogenic cell death to promote the infiltration of tumor-specific cytotoxic T cells into the immunologically “cold” tumor. Therefore, combination of nanoplatform-mediated SDT with anti-PDL1 antibodies effectively inhibited the primary tumors, as well as the metastatic tumors. This study provides an insightful strategy for improving SDT and broadens the application of MOF-based sonosensitizers for sono-immunotherapy.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）