Search

In this paper, the preparation of electroactive polymers artificial muscle electrode membrane with graphene oxide and manganese dioxide as the main research material to explore the performance of electrode membrane. Using sodium alginate as matrix, manganese dioxide with different mass ratios was compounded with graphene oxide and sodium alginate aqueous solution to prepare electrode films. The effects of manganese dioxide on the morphology and electrochemical properties of electrode films were discussed. From the test results, it can be seen that the scanning electron microscopy results show that the manganese dioxide layer is uniformly compounded on graphene oxide. With the increase of manganese dioxide/graphene oxide mass ratio, the specific capacitance of the electrode film gradually increases and the impedance increases. With the increase of driving voltage, the deflection displacement gradually increases and then shows a downward trend. When the mass ratio of manganese dioxide/graphene oxide is 0.1(# 2), the maximum deflection displacement is 14.1 mm, which is 2.76 times of the minimum deflection displacement of the sample (# 1). The specific capacitance of the electrode film was increased by 1.57 times to 15.62 F · g−1. Finally, the performance difference of graphene oxide electrode film and multi-walled carbon nanotube electrode film on EAP artificial muscle was explored. [ABSTRACT FROM AUTHOR]

The electrochemical behaviors of Mg-5Li-3Al-1La and Mg-8Li-3Al-1La electrodes in NaCl solution are investigated by means of potentiodynamic polarization, potentiostatic oxidation, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and X-ray diffraction (XRD). It is found that the Mg-8Li-3Al-1La electrode is of higher discharge activity than the Mg-5Li-3Al-1La electrode in 0.7 mol L−1 NaCl solution, which is consistent with the results observed from SEM images. The composition of the discharging products is also analyzed by means of XRD diffraction. This result shows that the Mg-8Li-3Al-1La alloy displays better compatibility with salt than the Mg-5Li-3Al-1La alloy, and the electrolyte can easily permeate the electrode, which enlarges the reaction zone and improves the activity of the electrode. The continuous discharging utilization efficiency of the Mg-5Li-3Al-1La and Mg-8Li-3Al-1La electrodes is 47.36 and 50.46%, respectively. The utilization of the Mg-Li-Al-La electrode is increased by 3.10% with the amount of Li increased from 5 to 8%. Meanwhile, the interval discharging utilization efficiency of the two electrodes is 46.13 and 49.88%, respectively, and the increase in the amount of Li in the electrode also brings a favorable effect on the interval electrochemical properties of the electrode. [ABSTRACT FROM AUTHOR]

In this research, the effect of the different concentrations of NaSnO as the electrolyte additive in 0.7 mol L NaCl solution on the electrochemical performances of the magnesium-8lithium (Mg-8Li) electrode are investigated by methods of potentiodynamic polarization, potentiostatic current-time, electrochemical impedance technique, and scanning electron microscopy (SEM). The corrosion resistance of the Mg-8Li electrode is improved when NaSnO is added into the electrolyte solution. The potentiostatic current-time curves show that the electrochemical behaviors of the Mg-8Li electrode in the electrolyte solution containing 0.20 mmol L NaSnO is the best. The electrochemical impedance spectroscopy results indicate that the polarization resistance of the Mg-8Li electrode decreases in the following order with the concentrations of NaSnO: 0.05 mmol L > 0.00 mmol L > 0.30 mmol L > 0.10 mmol L > 0.20 mmol L. The scanning electron microscopy studies indicate that the electrolyte additive prevents the formation of the dense oxide film on the alloy surface and facilitates the peeling off of the oxidation products. [ABSTRACT FROM AUTHOR]