Investigation of structural and electrochemical performance of Ru-substituted LiFePO4 cathode material: an improvement of the capacity and rate performance
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The cyclic voltammetric(CV) behavior of silver oxide electrodes were investigated as function of scan rate and mass ratio of common Ag 2O( d =0 5 μm) and nano Ag 2O. The peak shapes in CV diagramms were differed for the three electrodes when the scan rate was 0 5 mV/s and their peak current values were obviously different at any scan rate. The optimum mixture electrode( sample A ) exhibited remarkable cyclic reversibility, while the pure nanophase Ag 2O electrode( sample F ) was wear in receiving charges. The common Ag 2O electrode(sample C) was just in between them. The best electrochemical property of the optimum mixture electrode could be due to the effectively reasonable distribution of the electroactive substances on the surface of electrode.
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This work deals with the electrochemical study of Azometine-H by mean of cyclic voltammetry using a carbon paste electrode modified with multi-wall carbon nanotubes, MWCNT, and b-Cyclodextrin. The results obtained evidence that it possible to follow the electrochemical evolution of the azometin-H at pH 7.0 and that the use of an electrode modified with carbon nanotubes improved the electrochemical response, favoring the electron transfer and increasing the oxidation peak's current, as compared with a conventional carbon paste electrode. Further, it was found that the azometine-H displayed an adsorption process associated to the interaction between the compound under study and the b-ciclodextrin.
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Li1.12Ni0.8Mn0.1Co0.1O2 as cathode material for lithiumion batteries was synthesized by high-temperature solid method.The material was characterized by XRD(X-ray diffraction),SEM(scanning electron microscope),CV(cycle volt-ampere)and galvanostatic cycling.Electrochemical performance of Li1.12Ni0.8Mn0.1Co0.1O2 was characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),and galvanostatic charge-discharge tests.XRD results show the product synthesized at 800℃ have typicalα-NaFeO2layered structure.SEM results show that the powders synthesized at 800 ℃ have a spherical structure composed of small aggregates.In the voltage range of 2.5-4.3V,the Li1.12Ni0.8Mn0.1Co0.1O2 is cycled at a current density of 40mA/g,the cathode material synthesized at 800℃ has an initial specific discharge capacity of 184.1mAh/g,its initial discharge efficiency is 85.9%.With the increase of the cycle number,the electrochemical stability of sample was boosted up,the specific discharge capacity of 20th is 171.7mAh/g,the retain rate of capacity as high as 93.26%.The irreversible capacity loss occurred during the first cycle.The samples synthesized at lower temperatures(800℃)exhibited higher specific capacities and slower capacity fading and showing good electrochemical stabilities.
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Abstract A new method is proposed for the accurate and reproducible detection of dopamine using cyclic voltammetry on boron-doped diamond (BDD) electrode. It is shown that reproducible voltammograms can be obtained when applying a relatively high scan rate (100 V s−1) during the detection measurements. For lower scan rates (1 V s−1), it is proven that electrode fouling occurs due do the deposition of a polymer at the electrode surface arising from the oxidation of aminochrome. Cyclic voltammetry measurements of the [Fe(CN)6]3−/[Fe(CN)6]4− couple performed before and after dopamine detection on BDD and glassy carbon electrodes have shown that the electrochemical activity of the electrode decreases only at low scan rates for BDD dopamine (DA) detection, which leads to electrode poisoning whereas the activity remains unchanged for higher scan rates. However, on glassy carbon electrodes, the electrochemical activity of the material decreases after DA detection measurements independently of the scan rate applied. Therefore, this study shows that electrode fouling during the detection of dopamine by cyclic voltammetry can be avoided only when using BDD electrode but also only for high applied scan rates.
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Olivine LiFe1-xCrxPO4/C (x=0,0.02,0.04,0.08) cathode materials were synthesized by carbothermal reduction method. The crystalline structure of as-prepared cathode materials was characterized by XRD. The electrochemical properties of the materials were tested by constant-current cyclic testing,cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the positive materials LiFe1-xCrxPO4/C (x=0,0.02,0.04,0.08) had single olivine structure. Among them,the material LiFe0.96Cr0.04PO4/C exhibited the best electrochemical performance. The first discharge specific capacity was 142.41 mAh/g. After 30 cycles,the discharge specific capacity was above 137.05 mAh/g and the capacity retention was above 96.24%.
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Electrochemical reduction of 4-chlorophenol(4-CP)in basic solution was investigated by using cyclic voltammetry and in situ FTIR.The results of cyclic voltammograms showed that Ag electrode exhibited good performance for the electro-reduction of 4-CP and the reduction reaction could take place at a more positive potential.The study on possible mechanism of 4-CP on Ag electrode by in situ FTIR spectroscopy suggested that 4-CP was electro-reduced to its radical ion initially,then its radical ion was transformed to phenolate at a more negative potential and electrochemical dechlorination of 4-CP was realized.
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