The electrochemical and the mass transport behavior of ABTS2-/ABTS＇- （2,2＇-azinobis（3- ethylbenzothiazoline-6-sulfonate）） redox couple at glassy carbon electrode （GCE） in phos- phate buffer solution （PBS, pH=...The electrochemical and the mass transport behavior of ABTS2-/ABTS＇- （2,2＇-azinobis（3- ethylbenzothiazoline-6-sulfonate）） redox couple at glassy carbon electrode （GCE） in phos- phate buffer solution （PBS, pH=4.4） is studied in detail by cyclic voltammetry combined with rotating disk electrode system. From the i-E curves recorded at different electrode rotating rate, rate constant, and transfer coefficient for ABTS 2-←→ABTS^-＋e reaction at GCE electrode and the diffusion coefficient of ABTS2- in PBS are estimated to be 4.6× 10^-3 cm/s, 0.28, and 4.4× 10^-6 cm^2/s, respectively. The transfer coefficient with a value of ca. 0.28 differs largely from the value of 0.5 that is always assumed in the literature. The origins for the difference of the rate constant determined and the challenges for estimating the stan- dard rate constant are discussed. The performance for such ABTS2- mediated bio-cathode toward oxygen reduction reaction is discussed according to the over-potential drop as well as current output limit associated with the charge transfer kinetics of ABTS2- ←→ABTS-＋e redox reaction and/or the mass transport effect.展开更多
The relations between conductivity and temperature of YCl3-LiClO4-DMSO system were measured. The cyclic voltammetry, chronoamperometry, chronopotentiometry and X-ray diffraction were used to investigate the electroche...The relations between conductivity and temperature of YCl3-LiClO4-DMSO system were measured. The cyclic voltammetry, chronoamperometry, chronopotentiometry and X-ray diffraction were used to investigate the electrochemical behavior of Y3+ in YCl3-LiClO4-DMSO system on Pt and Cu cathodes. Experimental results indicate that the electroreduction of Y3+ to Y is irreversible in one step. The Y metal was prepared by potentiostatic electrolysis on Cu electrode in YCl3-LiClO4-DMSO system. The deposits composed of Y over 97% (mass fraction) were obtained. The diffusion coefficient and electron transfer coefficient of Y3+ in YCl3-LiClO4-DMSO system at 298 K are 3.22 x 10(-6) cm(2).s(-1) and 0.22, respectively.展开更多
Cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behavior of Fe(Ⅱ) and Er(Ⅲ) in a LiClO 4 DMSO(dimethylsufoxide) system at Pt and Cu electrodes. Experimental results indicate t...Cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behavior of Fe(Ⅱ) and Er(Ⅲ) in a LiClO 4 DMSO(dimethylsufoxide) system at Pt and Cu electrodes. Experimental results indicate that the reductions of Fe(Ⅱ) to Fe(0) and Er(Ⅲ) to Er(0) were irreversible at Pt and Cu electrodes. The diffusion coefficient and the electron transfer coefficient of Fe(Ⅱ) in a 0 01 mol/L FeCl 2 0 1 mol/L LiClO 4 DMSO system at 303 K were 1 70×10 -10 m 2/s and 0 08 respectively, the diffusion coefficient and the electron transfer coefficient of Er(Ⅲ) in a 0 01 mol/L ErCl 3 0 1mol/L LiClO 4 DMSO system at 303 K were 1 47×10 -10 m 2/s and 0 108 respectively. The homogeneous, strong adhesive Er Fe alloy films containing Er of 31 39%-42 12% in mass fraction with metallic lustre were prepared by potentiostatic electrolysis on a Cu electrode in a ErCl 3 FeCl 2 LiClO 4 DMSO system at -1 75--2 50 V( vs . SCE).展开更多
基金This work was supported by one hundred Talents＇ Program of the Chinese Academy of Science, the National Natural Science Foundation of China （No.21073176）, 973 Program from the Ministry of Science and Technology of China （No.2010CB923302）.
文摘The electrochemical and the mass transport behavior of ABTS2-/ABTS＇- （2,2＇-azinobis（3- ethylbenzothiazoline-6-sulfonate）） redox couple at glassy carbon electrode （GCE） in phos- phate buffer solution （PBS, pH=4.4） is studied in detail by cyclic voltammetry combined with rotating disk electrode system. From the i-E curves recorded at different electrode rotating rate, rate constant, and transfer coefficient for ABTS 2-←→ABTS^-＋e reaction at GCE electrode and the diffusion coefficient of ABTS2- in PBS are estimated to be 4.6× 10^-3 cm/s, 0.28, and 4.4× 10^-6 cm^2/s, respectively. The transfer coefficient with a value of ca. 0.28 differs largely from the value of 0.5 that is always assumed in the literature. The origins for the difference of the rate constant determined and the challenges for estimating the stan- dard rate constant are discussed. The performance for such ABTS2- mediated bio-cathode toward oxygen reduction reaction is discussed according to the over-potential drop as well as current output limit associated with the charge transfer kinetics of ABTS2- ←→ABTS-＋e redox reaction and/or the mass transport effect.
文摘The relations between conductivity and temperature of YCl3-LiClO4-DMSO system were measured. The cyclic voltammetry, chronoamperometry, chronopotentiometry and X-ray diffraction were used to investigate the electrochemical behavior of Y3+ in YCl3-LiClO4-DMSO system on Pt and Cu cathodes. Experimental results indicate that the electroreduction of Y3+ to Y is irreversible in one step. The Y metal was prepared by potentiostatic electrolysis on Cu electrode in YCl3-LiClO4-DMSO system. The deposits composed of Y over 97% (mass fraction) were obtained. The diffusion coefficient and electron transfer coefficient of Y3+ in YCl3-LiClO4-DMSO system at 298 K are 3.22 x 10(-6) cm(2).s(-1) and 0.22, respectively.
基金Supported by the Thousand- Hundred- Ten Talent Project Foundation of Guangdong Province Education Office(No.0 0 - 0 79- 4 2 10 0 5 ) and State Key L ab of Rare Material Chem istry and Applications
文摘Cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behavior of Fe(Ⅱ) and Er(Ⅲ) in a LiClO 4 DMSO(dimethylsufoxide) system at Pt and Cu electrodes. Experimental results indicate that the reductions of Fe(Ⅱ) to Fe(0) and Er(Ⅲ) to Er(0) were irreversible at Pt and Cu electrodes. The diffusion coefficient and the electron transfer coefficient of Fe(Ⅱ) in a 0 01 mol/L FeCl 2 0 1 mol/L LiClO 4 DMSO system at 303 K were 1 70×10 -10 m 2/s and 0 08 respectively, the diffusion coefficient and the electron transfer coefficient of Er(Ⅲ) in a 0 01 mol/L ErCl 3 0 1mol/L LiClO 4 DMSO system at 303 K were 1 47×10 -10 m 2/s and 0 108 respectively. The homogeneous, strong adhesive Er Fe alloy films containing Er of 31 39%-42 12% in mass fraction with metallic lustre were prepared by potentiostatic electrolysis on a Cu electrode in a ErCl 3 FeCl 2 LiClO 4 DMSO system at -1 75--2 50 V( vs . SCE).
