Search Results

Now showing 1 - 4 of 4

Some of the metrics are blocked by your
consent settings
The electrochemical measurements investigation of NiCo2O4for electrode materials of energy storage devices by using digital holography technique
(2021-01-01)
Prakobsang, Tawipon
;
Saei, Worawee
;
Kongsubto, Thee
;
Ruttanapun, Chesta
;
Buranasiri, Prathan
The electrochemical properties of NiCo2O4for using as electrode materials for the potential applications have been investigated by electrochemical measurement which composed of cyclic voltammetry (CV) and galvanostatic chargedischarge (GCD). These processes are generating the ion exchange between the electrode and electrolyte, wherein induce the surface change of the interface. Especially, since in the cycle ability measurement using the potentiostat needed to repeat the cycle into the electrode for many times, the effective of the electrode is reduced. In this research, digital holographic technique was used to investigate the different properties of interface of the NiCo2O4 electrode while operating under the various electrochemical techniques. In our DH recording, the surface change of the electrode was expose at the difference potential scan rate at 1, 5, 10, 50, 100 and 200 mV/s of CV, and the difference current densities at 1, 2, 3, 5, 10 and 20 A/g of GCD and vary times of cycle ability test every 50 cycle times to 1000 cycles. In the end the reconstructed DH images of the electrode have been used to analyze the results from electrochemical measurement.
Some of the metrics are blocked by your
consent settings
Analysis of liquids conductivity using hall effect sensor based on electromagnetic field properties
(2017-11-10)
Sokjabok, Siwakon
;
Sriratana, Witsarut
;
Satthamsakul, Sutham
This paper presents a new methodology of analyzing liquid conductivity via the Hall Effect sensor based on electrochemical properties. Two different magnetic field cores with the same coil length (10 m, AWG 31) were studied, namely ferrite solenoid cores and toroidal iron powder cores (T131-26). The magnetic field generated by both type of cores was then used to generate a Hall voltage with the cores ratios of 1 : 1. The output Hall voltage is, in turn, sent through a microcontroller, together with a 10 bit converter for real time data analysis. The magnetic-field density of the solenoid for analyzing the conductivity of brine is 31 mT for solenoid, and 10.74 mT for toroid cores, respectively. Results from other materials are compared to the reference conductivity values of salt solution, which amounts to 16.211 mS/cm when assessed with the solenoid core, and 16.406 mS/cm when assessed with the toroid core.
Some of the metrics are blocked by your
consent settings
Electrochemical sensor based on PANI/MnO2-Sb2O3 nanocomposite for selective simultaneous voltammetric determination of ascorbic acid and acetylsalicylic acid
(2016-12-01)
Puangjan, Apinya
;
Chaiyasith, Suwan
;
Wichitpanya, Saniporn
;
Daengduang, Sirirat
;
Puttota, Silarin
A new electrochemical sensor made from nanocomposite of manganese dioxide (MnO<inf>2</inf>)-antimony trioxide (Sb<inf>2</inf>O<inf>3</inf>) was fabricated on polyaniline (PANI) - patterned fluorine doped tin oxide (FTO) electrode (PANI/MnO<inf>2</inf>-Sb<inf>2</inf>O<inf>3</inf> nanocomposite/FTO) through a simple potentiostatic deposition method. The properties of the nanocomposite were characterized by field emission scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy and other electrochemical techniques. Such nanostructure combines the advantages of PANI (high conductivity and stability) with that of electrocatalytic species (good electrochemical activity). The sensor was applied for simultaneous determination of ascorbic acid (AA) and acetylsalicylic acid (ASA). The linear relationships between their current intensity and concentration were in the range of 6–265.42 nmol L− 1 and 1.2–228.68 nmol L− 1 with detection limit (S/N = 3) of 1.05 nmol L− 1 and 0.20 nmol L− 1, respectively. Experimental results demonstrated that the sensor possesses high selectivity and suffers no interference from competing species. Moreover, it successfully detected AA and ASA in human urine samples with highly satisfactory results.
Some of the metrics are blocked by your
consent settings
NiO/MWCNTs coated F-doped tin oxide working electrode for hydrogen peroxide detection
(2011-01-01)
Jandai, Boonsong
;
Woointranont, Papitchaya
;
Chaiyasith, Suwan
;
Pecharapa, Wisanu
In this work, NiO/MWCNTs composites were synthesized by heat treatment via two methods. MWCNTs was treated by classical oxidative with acid. The treated MWCNTs was mixed with Nickel acetate in various concentration before calcined at 400°C for 2 h to obtain the NiO/MWCNTs and compared with another method that prepared by chemically depositing nickel hydroxide onto carbon nanotubes under microwave irradiation and thermal annealing process. The modified electrode for the detection of hydrogen peroxide was successfully developed on cross-linking between NiO/MWCNTs nanocomposites and fluorine-doped tin oxide (FTO) using nafion as binder. The physical properties of the composites were investigated by Field Emission Scanning Electron Microscope (FE-SEM) and X-ray Diffractometer (XRD). The SEM results indicated that NiO nanoparticles were well distributed on the surface of MWCNTs. The cyclic voltammetry were used to confirm the successful procedure synthesis of NiO/MWCNTs/FTO and the concentration of hydrogen peroxide was determined by amperometry, by mean of the NiO/MWCNTs/nafion/FTO as working electrode. © 2011 Published by Elsevier Ltd.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results