A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of ...A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of the cyclic voltammograms was improved obviously. The remarkable advantage of the modified electrode was the high sensitivity and favorable electrocatalytic behavior toward NO - 2. The peak current increased linearly with the concentration of NO - 2 in the range of 8.0×10 -7—0.01 mol/L. The detection limit of NO - 2 was 1.0×10 -9 mol/L. The polyoxometalates nanopaticles modified electrode exhibited almost the same electrochemical behavior after 7 d. It is indicated that the PMo 12-PPy/AGCE has a good reproducibility, stability and wide linearity range.展开更多
The interaction sites between microperoxidase-8(MP-8) and Eu^3+ was determined using electrochemical techniques. It is found that two Eu^3+ ions would coordinate strongly with carboxylate oxygen of two propionic acid ...The interaction sites between microperoxidase-8(MP-8) and Eu^3+ was determined using electrochemical techniques. It is found that two Eu^3+ ions would coordinate strongly with carboxylate oxygen of two propionic acid groups of the heme group in an MP-8 molecule, leading to the increase in the reversibility of the electrochemical reaction of MP-8. The excessive Eu^3+ ions weakly interact with the oxygen containing groups in the peptide chain of MP-8.展开更多
The microstructure and electrochemical properties of Ti0.17Zr0.08V0.35Cr0.10Ni0.30 alloy were investigated. The alloy was found to be consisted of V-based solid solution phase with bcc structure and C14 Laves phase wi...The microstructure and electrochemical properties of Ti0.17Zr0.08V0.35Cr0.10Ni0.30 alloy were investigated. The alloy was found to be consisted of V-based solid solution phase with bcc structure and C14 Laves phase with hexagonal structure. SEM-FEG results show that C14 Laves phase precipitates between bcc phases. V and Cr essentially exist in bcc phase, Ti and Ni mainly in C14 Laves phase, as proved by EDX data. The electrochemical properties prove that the discharge capacity of Ti0.17Zr0.08V0.35Cr0.10Ni0.30 alloy electrode decreases slightly with increasing temperature, but it keeps high discharge capacity at 343 K. At the same time, the charge-transfer resistance decreases and the high rate dischargeability increases as temperature increases.展开更多
文摘A novel modified electrode was prepared by electrochemicaly cycling scanning the glass carbon electrode covered with a macroporous alumina membrane in a solution containing PPy and PMo 12O 3- 40. The reversibility of the cyclic voltammograms was improved obviously. The remarkable advantage of the modified electrode was the high sensitivity and favorable electrocatalytic behavior toward NO - 2. The peak current increased linearly with the concentration of NO - 2 in the range of 8.0×10 -7—0.01 mol/L. The detection limit of NO - 2 was 1.0×10 -9 mol/L. The polyoxometalates nanopaticles modified electrode exhibited almost the same electrochemical behavior after 7 d. It is indicated that the PMo 12-PPy/AGCE has a good reproducibility, stability and wide linearity range.
文摘The interaction sites between microperoxidase-8(MP-8) and Eu^3+ was determined using electrochemical techniques. It is found that two Eu^3+ ions would coordinate strongly with carboxylate oxygen of two propionic acid groups of the heme group in an MP-8 molecule, leading to the increase in the reversibility of the electrochemical reaction of MP-8. The excessive Eu^3+ ions weakly interact with the oxygen containing groups in the peptide chain of MP-8.
基金supported by the National Key Research and Development Program of China(No.2016YFA0201300)National Natural Science Foundation of China(Nos.21874126,and 21675148)the Chinese Academy of Sciences(CAS)-the Academy of Sciences for the Developing World(TWAS)President's Fellowship Program。
文摘The microstructure and electrochemical properties of Ti0.17Zr0.08V0.35Cr0.10Ni0.30 alloy were investigated. The alloy was found to be consisted of V-based solid solution phase with bcc structure and C14 Laves phase with hexagonal structure. SEM-FEG results show that C14 Laves phase precipitates between bcc phases. V and Cr essentially exist in bcc phase, Ti and Ni mainly in C14 Laves phase, as proved by EDX data. The electrochemical properties prove that the discharge capacity of Ti0.17Zr0.08V0.35Cr0.10Ni0.30 alloy electrode decreases slightly with increasing temperature, but it keeps high discharge capacity at 343 K. At the same time, the charge-transfer resistance decreases and the high rate dischargeability increases as temperature increases.
