The electrochemical reduction of CO2 on copper electrode was investigated in acetonitrile(MeCN),dimethyl formamide(DMF)and dimethyl sulfoxide(DMSO)containing 0.1 mol/L tetraethylammonium bromioe(TEABr)by cyclic voltam...The electrochemical reduction of CO2 on copper electrode was investigated in acetonitrile(MeCN),dimethyl formamide(DMF)and dimethyl sulfoxide(DMSO)containing 0.1 mol/L tetraethylammonium bromioe(TEABr)by cyclic voltammetry and chronocoulometry at 298 K and under atmospheric pressure.There were obviously irreversible one-electron reduction peaks after saturated with CO2 on copper electrode in three solvents,which generated anion radical of CO2.The influence of scan rate was also studied by cyclic voltammetry.The diffusion coefficients of CO2 in MeCN,DMF and DMSO were 8.981×10-6,1.019×10-6 and 1.032×10-6 cm2/s and the transfer coefficients were 0.064,0.042 and 0.059,respectively.These results show that the electroreduction of CO2 was an irreversible diffusion controlled process.展开更多
Adsorption behaviors of Cu2Zn2SOD on mercury electrodes were studied by the electrostatic capillary curve and the relationship between polarographic ultimate current and height of mercury column in the absence of the ...Adsorption behaviors of Cu2Zn2SOD on mercury electrodes were studied by the electrostatic capillary curve and the relationship between polarographic ultimate current and height of mercury column in the absence of the mediators. The effects of impure and denatured SOD on cyclic voltammogram were investigated, confirming that no denaturation was caused during adsorption on mercury electrodes. Double potential step chronocoulometry has confirmed that SOD adsorption on mercury electrode to be the absorption of monomolecular layer.展开更多
The electrochem ical behaviors of sod ium dodecyl benzene su lfonate(SDBS)were investigated by cyc lic voltamm etry(CV) at glassy carbon electrode(GCE) using K4Fe(CN)6as a electroactive probe in 0.05 mol.L-1H2SO4aqueo...The electrochem ical behaviors of sod ium dodecyl benzene su lfonate(SDBS)were investigated by cyc lic voltamm etry(CV) at glassy carbon electrode(GCE) using K4Fe(CN)6as a electroactive probe in 0.05 mol.L-1H2SO4aqueous solution.The d iffusion coeffic ients Dm,the hydrodynam ic rad ius Rm,aggregation number n,the average m icelle we ightMmand the self-d iffusion coeffi-c ient Dm0of SDBS m icelle in the vic in ity of the criticalm icelle concentration(CMC) in aqueous solutions were also determ ined by chronou lom try(CC).展开更多
This paper describes two methods of representation of voltages and currents in electric circuits： in the vector form and in the shape of oscillations, represented as diagrams in the plane. The appropriate power compo...This paper describes two methods of representation of voltages and currents in electric circuits： in the vector form and in the shape of oscillations, represented as diagrams in the plane. The appropriate power components are discussed depending on the representation of voltages and currents. Special attention is paid to the instantaneous power peculiarities for diverse loads and non-sinusoidal conditions. A case study of power calculations in an electric circuit with a pluggable capacitor is presented. For these types of transient modes, the instantaneous power is represented in the form of active and reactive components. Calculation of active, reactive, and exchange powers for steady-state processes is presented.展开更多
文摘The electrochemical reduction of CO2 on copper electrode was investigated in acetonitrile(MeCN),dimethyl formamide(DMF)and dimethyl sulfoxide(DMSO)containing 0.1 mol/L tetraethylammonium bromioe(TEABr)by cyclic voltammetry and chronocoulometry at 298 K and under atmospheric pressure.There were obviously irreversible one-electron reduction peaks after saturated with CO2 on copper electrode in three solvents,which generated anion radical of CO2.The influence of scan rate was also studied by cyclic voltammetry.The diffusion coefficients of CO2 in MeCN,DMF and DMSO were 8.981×10-6,1.019×10-6 and 1.032×10-6 cm2/s and the transfer coefficients were 0.064,0.042 and 0.059,respectively.These results show that the electroreduction of CO2 was an irreversible diffusion controlled process.
文摘Adsorption behaviors of Cu2Zn2SOD on mercury electrodes were studied by the electrostatic capillary curve and the relationship between polarographic ultimate current and height of mercury column in the absence of the mediators. The effects of impure and denatured SOD on cyclic voltammogram were investigated, confirming that no denaturation was caused during adsorption on mercury electrodes. Double potential step chronocoulometry has confirmed that SOD adsorption on mercury electrode to be the absorption of monomolecular layer.
文摘The electrochem ical behaviors of sod ium dodecyl benzene su lfonate(SDBS)were investigated by cyc lic voltamm etry(CV) at glassy carbon electrode(GCE) using K4Fe(CN)6as a electroactive probe in 0.05 mol.L-1H2SO4aqueous solution.The d iffusion coeffic ients Dm,the hydrodynam ic rad ius Rm,aggregation number n,the average m icelle we ightMmand the self-d iffusion coeffi-c ient Dm0of SDBS m icelle in the vic in ity of the criticalm icelle concentration(CMC) in aqueous solutions were also determ ined by chronou lom try(CC).
文摘This paper describes two methods of representation of voltages and currents in electric circuits： in the vector form and in the shape of oscillations, represented as diagrams in the plane. The appropriate power components are discussed depending on the representation of voltages and currents. Special attention is paid to the instantaneous power peculiarities for diverse loads and non-sinusoidal conditions. A case study of power calculations in an electric circuit with a pluggable capacitor is presented. For these types of transient modes, the instantaneous power is represented in the form of active and reactive components. Calculation of active, reactive, and exchange powers for steady-state processes is presented.
