One-Pot Electrodeposition of NiS Nanoparticles as an Efficient Electrode for Nonenzymatic H2O2 and Glucose Sensors

In this paper, a new and one-pot electrodeposition method was expanded for the preparation of NiS nanoparticles-based electrochemical biosensor using metal-ion complexes as a precursor. Thioacetamide was used to control the production rate of NiS nanoparticles for the first time. The proposed electrochemical sensor was characterized by energy dispersive X-ray spectroscopy (EDX), field emission scanning electron microscope (FESEM), cyclic voltammograms (CV), and electrochemical impedance spectra (EIS). Experiment parameters were optimized. Under the optimized condition, the prepared NiS-based biosensor exhibited excellent electrocatalytic oxidation of H2O2 and glucose due to their small size. It provided fast and sensitive strategy for detecting H2O2 and glucose in the range of 1–5000 and 1–1000[Formula: see text][Formula: see text]M. The detection limit of 0.257 and 0.3[Formula: see text][Formula: see text]M was obtained for H2O2 and glucose. The mechanisms were also analyzed. The proposed biosensor exhibited excellent anti-interference and repeatability. Furthermore, it was applied in the actual sample analysis, such as human blood serum.

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Synthesis and Characterization of Li0.97K0.03FePO4/Graphene Composites by Carbonthermal Reduction Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.687-691.4327 ◽

2014 ◽

Vol 687-691 ◽

pp. 4327-4330

Author(s):

Yan Wang ◽

Zhe Sheng Feng ◽

Lu Lin Wang ◽

Jin Ju Chen ◽

Zhen Yu He

Keyword(s):

Discharge Capacity ◽

Photoelectron Spectroscopy ◽

Reduction Method ◽

Electrochemical Impedance ◽

Impedance Spectra ◽

X Ray Diffraction ◽

Capacity Retention ◽

Electrochemical Impedance Spectra ◽

X Ray

Li0.97K0.03FePO4 and Li0.97K0.03FePO4/graphene composites were synthesized by carbothermal reduction method using acetylene black as carbon source. The structure and electrochemical properties of the prepared materials were investigated with X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, galvanostatic charge and discharge and electrochemical impedance spectra tests. The results indicated that K doping improves the cyclic stability of samples, the addition of small amounts of graphene results in better electronic properties on sample. Li0.97K0.03FePO4/graphene showed discharge capacity of 158.06 and 90.55 mAh g-1 at 0.1 C and 10 C, respectively. After the 50 cycle test at different rates, the reversible discharge capacity at 0.1 C was 158.58 mAh g-1, indicating the capacity retention ratio of 100.32%.

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SPINEL Li2MTi3O8(M = Mg, Mg0.5Zn0.5) NANOWIRES WITH ENHANCED ELECTROCHEMICAL LITHIUM STORAGE

Functional Materials Letters ◽

10.1142/s1793604711001701 ◽

2011 ◽

Vol 04 (01) ◽

pp. 65-69 ◽

Cited By ~ 44

Author(s):

ZHENSHENG HONG ◽

TONGBIN LAN ◽

YONGZAN ZHENG ◽

LILONG JIANG ◽

MINGDENG WEI

Keyword(s):

Solid State ◽

Anode Materials ◽

Electrochemical Impedance ◽

Impedance Spectra ◽

Li Ion Battery ◽

Lithium Storage ◽

Electrochemical Impedance Spectra ◽

Titanate Nanowires ◽

Li Ion ◽

First Time

Spinel structural Li2MTi3O8 ( M = Mg, Mg0.5Zn0.5 ) nanowires have been successfully synthesized using titanate nanowires as a precursor and then have been used for the first time as anode materials in a rechargeable Li -ion battery. The cell composed of Li2MgTi3O8 nanowires exhibited a discharge capacity of 232 mAhg-1 at the second cycle, while only 159 mAhg-1 was obtained for the bulk prepared by a solid state reaction. The results of electrochemical impedance spectra indicate that spinel structural Li2MTi3O8 ( M = Mg, Mg0.5Zn0.5 ) nanowires can significantly reduce the charge transfer impedance, leading to enhanced capability of electrochemical lithium storage.

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Electrochemical Performance of Mg-Doped Li2FeSiO4/C as Cathode Material for Lithium-Ion Batteries

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.310.90 ◽

2013 ◽

Vol 310 ◽

pp. 90-94 ◽

Cited By ~ 1

Author(s):

Xiao Bing Huang ◽

Hong Hui Chen ◽

Huang Rong Li ◽

Qian Peng Yang ◽

Shi Biao Zhou ◽

...

Keyword(s):

Electrochemical Impedance ◽

Rate Capability ◽

Lithium Ion ◽

Impedance Spectra ◽

X Ray Diffraction ◽

Electrochemical Impedance Spectra ◽

Solid State Method ◽

X Ray ◽

Mg Doped ◽

Discharge Test

Li2FeSiO4/C and Li1.97Mg0.03FeSiO4/C composites were successfully prepared by a solid-state method. Both samples were systematically investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), the charge-discharge test and electrochemical impedance spectra measurement, respectively. It was found that the Li1.97Mg0.03FeSiO4/C composite exhibited an excellent rate capability with a discharge capacity of 144mAh g-1 at 0.2C and 97mAh g-1 at 5C, and after 100 cycles at 1 C, 96% of its initial capacity was retained.

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Co-Effect of AlF3 and MgF2 Coating on the Electrochemical Performance of LiNi1/3Co1/3Mn1/3O2 Cathode Material under High Voltage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1088.327 ◽

2015 ◽

Vol 1088 ◽

pp. 327-331

Author(s):

Fei Fei Zhao ◽

Dao Bin Mu ◽

Xiong Xiong Hou ◽

Lei Wang ◽

Yong Huan Ren ◽

...

Keyword(s):

Electrochemical Performance ◽

Cathode Material ◽

Electrochemical Impedance ◽

Impedance Spectra ◽

X Ray Diffraction ◽

Electrochemical Impedance Spectra ◽

X Ray ◽

Interface Charge ◽

Interface Charge Transfer ◽

Charge Discharge

AlF3 and MgF2 were applied to modify the surface of the LiNi1/3Co1/3Mn1/3O2 cathode material. The structural and electrochemical properties of the materials were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), charge–discharge tests and electrochemical impedance spectra (EIS). The results show that the 1 wt.% AlF3 and 1 wt.% MgF2 coated LiNi1/3Co1/3Mn1/3O2 (NCM333) cathode material exhibits an optimized electrochemical performance. It presents an initial capacity of 207.2mAh/g and 169.1mAh/g at 0.2C between 2.8V and 4.7V after charge-discharge 65 cycles. The rate performance is also enhanced because the coating decreases the interface charge transfer impedance.

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Performance of Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Ag Composite Cathode Materials for IT-SOFCs

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.2309 ◽

2011 ◽

Vol 311-313 ◽

pp. 2309-2314 ◽

Cited By ~ 2

Author(s):

Wen Xia Zhu ◽

Zhe Lü ◽

Le Xin Wang ◽

Xiao Yan Guan ◽

Xin Yan Zhang

Keyword(s):

Solid Oxide Fuel Cells ◽

Electrochemical Impedance ◽

Composite Cathode ◽

Solid Oxide ◽

Electrode Polarization ◽

Impedance Spectra ◽

Electrochemical Impedance Spectra ◽

Composite Cathodes ◽

Reduced Temperature ◽

Resistance Value

°Abstract. In order to develop new cathodes for reduced temperature SOFCs, Ba0.5Sr0.5Co0.8Fe0.2O3-δ-Ag composite cathode was investigated in intermediate-temperature Solid Oxide Fuel Cells (IT-SOFCs). The XRD results suggested that no chemical reactions between BSCF and Ag in the composite cathode were found. The resistance measurements showed that the addition of Ag into BSCF improved electrical conductivity of pure BSCF, and the improved conductivity resulted in attractive cathode performance. In addition, electrochemical impedance spectra exhibited the better performance of BSCF-Ag composite cathodes than pure BSCF, e.g., the polarization resistance value of BSCF-Ag was only 0.36Ω cm2 at 650°C, which was nearly 80% lower than that of BSCF electrode. Polarization curves showed the overpotential decreased with the addition of Ag. The current density value of BSCF-Ag was 0.88Acm-2 under –120mV, about five times of that BSCF measured at 650°C. As a summary, compared to a pure BSCF cathode, it was found that adding Ag in the cathode enhanced the BSCF performance significantly.

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Interaction between Sodium Molybdate and FSWed Wled of 5083 Effected by Time

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.699.645 ◽

2013 ◽

Vol 699 ◽

pp. 645-649

Author(s):

Chang Bin Shen

Keyword(s):

Inhibition Efficiency ◽

Electrochemical Impedance ◽

Electrochemical Corrosion ◽

Sodium Molybdate ◽

Impedance Spectra ◽

Electrochemical Impedance Spectra ◽

Friction Stir ◽

Base Materials ◽

Corrosion Behaviors ◽

5083 Aluminum Alloy

Similar welds composed of 5083 were produced by friction stir welding. In the solution of 0.2 M NaHSO3 and 0.6 M NaCl, with the addition of a given concentration sodium molybdate as the inhibitor, the electrochemical corrosion behaviors of the friction stir welds (FSW) and 5083 were comparatively investigated by potentiodynamic polarization curve tests and electrochemical impedance spectra (EIS) at the ambient temperature for different test periods. The results indicated that : with the extension of period, the inhibition efficiencies (IE) for both the weld and 5083 base materials enhanced, at the same period, the inhibition efficiency (IE) for the weld was beyond that for 5083 base materials, sodium molybdate may be thought of as an effective inhibitor for 5083 aluminum alloy, the interaction between inhibitor and weld is stronger than that between inhibitor and base materials.

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An analysis of drifts and nonlinearities in electrochemical impedance spectra

Electrochimica Acta ◽

10.1016/j.electacta.2011.06.112 ◽

2011 ◽

Vol 56 (22) ◽

pp. 7467-7475 ◽

Cited By ~ 9

Author(s):

Niket S. Kaisare ◽

Vimala Ramani ◽

Karthik Pushpavanam ◽

S. Ramanathan

Keyword(s):

Electrochemical Impedance ◽

Impedance Spectra ◽

Electrochemical Impedance Spectra

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Few-Layered MoS2 Nanostructures for Highly Efficient Visible Light Photocatalysis

NANO ◽

10.1142/s1793292016501149 ◽

2016 ◽

Vol 11 (10) ◽

pp. 1650114 ◽

Cited By ~ 5

Author(s):

Dan Li ◽

Jianwei Li ◽

Caiqin Han ◽

Xinsheng Zhao ◽

Haipeng Chu ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Visible Light ◽

Electrochemical Impedance ◽

X Ray Diffraction ◽

Electron Hole ◽

Electrochemical Impedance Spectra ◽

X Ray ◽

Transmission Electron ◽

Electron Hole Pair

Few-layered MoS2 nanostructures were successfully synthesized by a simple hydrothermal method without the addition of any catalysts or surfactants. Their morphology, structure and photocatalytic activity were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electrochemical impedance spectra and UV-Vis absorption spectroscopy, respectively. These results show that the MoS2 nanostructures synthesized at 180[Formula: see text]C exhibit an optimal visible light photocatalytic activity (99%) in the degradation of Rhodamine B owing to the relatively easier adsorption of pollutants, higher visible light absorption and lower electron–hole pair recombination.

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