Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample pr...Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample prepared by solution state reaction. TG and DTA curves showed that α Ni(OH)2 began to decompose at higher temperature than β Ni(OH)2. The electrochemical behaviorsof the sample were studied by cyclic voltammetry and constant current charge discharge experiment. It was found that the sample by solid state reaction hadmore excellent electrode reversibility, higher discharge potential and higher discharge capacity.展开更多
The glucose oxidase (GOD) immobilized onto the surface of activated ca rbon powders at the glassy carbon electrode (GOD-C/GC) could undergo the quasi-r eversible, direct electrochemical reaction. Its formal redox pote...The glucose oxidase (GOD) immobilized onto the surface of activated ca rbon powders at the glassy carbon electrode (GOD-C/GC) could undergo the quasi-r eversible, direct electrochemical reaction. Its formal redox potential, E0′, is almost independent on the scan rates. The average value of E0′ is (-0.467 ± 0 .002) V (vs SCE) in the pH 6.8 phosphate buffer solution. Its apparent heterogen eous electron transfer rate constant (ks) is (1.18 ± 0.59) s-1, which is much h igher than that reported previously. The dependence of E0′ on the pH of the buf fer solution indicated that the direct electrochemical reaction of the immobiliz ed GOD is a two-electron transfer reaction process coupled with two-proton trans fer. The further experimental results demonstrated that the immobilized GOD reta ined its bioelectrocatalytic activity to the oxidation of β-D(+) glucose.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
文摘Ni(OH)2 including 20%Al was synthesized by solid state reaction. The result of XRD indicated that the sample thus prepared was α Ni(OH)2, and its size and crystalline form were much poorer than those of the sample prepared by solution state reaction. TG and DTA curves showed that α Ni(OH)2 began to decompose at higher temperature than β Ni(OH)2. The electrochemical behaviorsof the sample were studied by cyclic voltammetry and constant current charge discharge experiment. It was found that the sample by solid state reaction hadmore excellent electrode reversibility, higher discharge potential and higher discharge capacity.
文摘The glucose oxidase (GOD) immobilized onto the surface of activated ca rbon powders at the glassy carbon electrode (GOD-C/GC) could undergo the quasi-r eversible, direct electrochemical reaction. Its formal redox potential, E0′, is almost independent on the scan rates. The average value of E0′ is (-0.467 ± 0 .002) V (vs SCE) in the pH 6.8 phosphate buffer solution. Its apparent heterogen eous electron transfer rate constant (ks) is (1.18 ± 0.59) s-1, which is much h igher than that reported previously. The dependence of E0′ on the pH of the buf fer solution indicated that the direct electrochemical reaction of the immobiliz ed GOD is a two-electron transfer reaction process coupled with two-proton trans fer. The further experimental results demonstrated that the immobilized GOD reta ined its bioelectrocatalytic activity to the oxidation of β-D(+) glucose.
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.
