Zirconium oxide nanoparticles with 0.4 wt.%and 0.8 wt.%are incorporated into the Al-0.65 Mg-0.05 Ga-0.15 Sn(wt.%)alloy anode(base alloy)in order to improve the performance of the resulting anodes.Electrochemical chara...Zirconium oxide nanoparticles with 0.4 wt.%and 0.8 wt.%are incorporated into the Al-0.65 Mg-0.05 Ga-0.15 Sn(wt.%)alloy anode(base alloy)in order to improve the performance of the resulting anodes.Electrochemical characterization of the reinforced alloys was done by potentiodynamic polarization,electrochemical impedance spectroscopy and galvanostatic discharge and corrosion behavior was evaluated using self-corrosion rate and hydrogen evolution in 4 mol/L KOH solution.The surface morphology of the alloys was also studied using field emission scanning electron microscope(FESEM).The obtained results indicate that the base alloy shows high corrosion rate in 4 mol/L KOH solution by releasing 0.47 m L/(min·cm^2)hydrogen gas,whereas the alloy containing 0.8 wt.%Zr O2 provides the lowest hydrogen evolution rate by releasing 0.32 m L/(min·cm^2)hydrogen gas.Furthermore,by increasing zirconium oxide nanoparticles,the corrosion current density of the aluminum anodes is decreased and their corrosion resistance increases significantly compared to the base alloy in alkaline solution.In addition,nanometer-sized zirconium oxide incorporated anodes exhibit the improved galvanic discharge efficiencies,so that 0.8 wt.%nano-zirconium oxide incorporated base alloy displays the highest power density and anodic utilization compared with the others in 4 mol/L KOH solution.展开更多
A polytyramine-copper oxalate nanocomposite modified copper(PTCOxNMC) electrode prepared by electropolymerization was examined for electrocatalytic activity towards the oxidation of methanol in alkaline solution using...A polytyramine-copper oxalate nanocomposite modified copper(PTCOxNMC) electrode prepared by electropolymerization was examined for electrocatalytic activity towards the oxidation of methanol in alkaline solution using cyclic voltammetry and impedance spectroscopy. The prepared PTCOxNMC electrode showed a significantly high response for adsorbed methanol oxidation. The effects of various parameters such as potential scan rate and methanol concentration on the electrocatalytic oxidation at the surface of the PTCOxNMC electrode were investigated. Spectrometry techniques such as Fourier transform infrared spectroscopy and scanning electron microscopy were used to determine the surface physical characteristics of the modified electrode and revealed that the polytyramine-copper oxalate nanocomposite particles were highly dispersed on the surface of the copper electrode with a narrow size up to 40 nm. The very high current density obtained for the catalytic oxidation may have resulted from the high electrode surface area caused by modification with the poly-tyramine-copper oxalate nanocomposite.展开更多
文摘Zirconium oxide nanoparticles with 0.4 wt.%and 0.8 wt.%are incorporated into the Al-0.65 Mg-0.05 Ga-0.15 Sn(wt.%)alloy anode(base alloy)in order to improve the performance of the resulting anodes.Electrochemical characterization of the reinforced alloys was done by potentiodynamic polarization,electrochemical impedance spectroscopy and galvanostatic discharge and corrosion behavior was evaluated using self-corrosion rate and hydrogen evolution in 4 mol/L KOH solution.The surface morphology of the alloys was also studied using field emission scanning electron microscope(FESEM).The obtained results indicate that the base alloy shows high corrosion rate in 4 mol/L KOH solution by releasing 0.47 m L/(min·cm^2)hydrogen gas,whereas the alloy containing 0.8 wt.%Zr O2 provides the lowest hydrogen evolution rate by releasing 0.32 m L/(min·cm^2)hydrogen gas.Furthermore,by increasing zirconium oxide nanoparticles,the corrosion current density of the aluminum anodes is decreased and their corrosion resistance increases significantly compared to the base alloy in alkaline solution.In addition,nanometer-sized zirconium oxide incorporated anodes exhibit the improved galvanic discharge efficiencies,so that 0.8 wt.%nano-zirconium oxide incorporated base alloy displays the highest power density and anodic utilization compared with the others in 4 mol/L KOH solution.
文摘A polytyramine-copper oxalate nanocomposite modified copper(PTCOxNMC) electrode prepared by electropolymerization was examined for electrocatalytic activity towards the oxidation of methanol in alkaline solution using cyclic voltammetry and impedance spectroscopy. The prepared PTCOxNMC electrode showed a significantly high response for adsorbed methanol oxidation. The effects of various parameters such as potential scan rate and methanol concentration on the electrocatalytic oxidation at the surface of the PTCOxNMC electrode were investigated. Spectrometry techniques such as Fourier transform infrared spectroscopy and scanning electron microscopy were used to determine the surface physical characteristics of the modified electrode and revealed that the polytyramine-copper oxalate nanocomposite particles were highly dispersed on the surface of the copper electrode with a narrow size up to 40 nm. The very high current density obtained for the catalytic oxidation may have resulted from the high electrode surface area caused by modification with the poly-tyramine-copper oxalate nanocomposite.
