A mercury-free solid electrode system for the electrochemical generation of O ·- 2 was described. The effects of pH, the amount of the surfactant and electrode materials on the reduction of O 2 were investigated....A mercury-free solid electrode system for the electrochemical generation of O ·- 2 was described. The effects of pH, the amount of the surfactant and electrode materials on the reduction of O 2 were investigated. The electrogeneration of O ·- 2 was only obtained at the Pt electrode in this medium system. The different electrochemical behaviour of O 2 at Pt electrode and Au electrode were explained in terms of the different adsorptions of DSAB, which was confirmed by quartz crystal microbalance(QCM). The frequency responses for the reduction of O 2 at Pt electrode and Au electrodes were compared by electrochemical quartz crystal microbalance(EQCM), suggesting that the electrogenerated O ·- 2 was adsorbed on the surface of the Pt electrode. The one-electron reduction of oxygen in this system was also confirmed by using chronocoulometry. The scavenging activities of two kinds of antioxidants(ascorbic acid and cysteine) were examined and compared.展开更多
Dynamical model of coupled electrode BZ reaction system is established based on FKN mechanism and Oregonator model.Under certain conditions,the effect of electrode current on BZ electrochemical reaction system is disc...Dynamical model of coupled electrode BZ reaction system is established based on FKN mechanism and Oregonator model.Under certain conditions,the effect of electrode current on BZ electrochemical reaction system is discussed.By means of stability analysis of three-variable system,limit cycle oscillatory regime of the electrode reaction phase is calculated numerically.It turns out that limit cycle oscillation can appear in electrode phase under a fixed current when the bulk phase is at a steady state.Meanwhile,external electrode current can lead to non-synchronization of bulk phase and electrode reaction phase.展开更多
文摘A mercury-free solid electrode system for the electrochemical generation of O ·- 2 was described. The effects of pH, the amount of the surfactant and electrode materials on the reduction of O 2 were investigated. The electrogeneration of O ·- 2 was only obtained at the Pt electrode in this medium system. The different electrochemical behaviour of O 2 at Pt electrode and Au electrode were explained in terms of the different adsorptions of DSAB, which was confirmed by quartz crystal microbalance(QCM). The frequency responses for the reduction of O 2 at Pt electrode and Au electrodes were compared by electrochemical quartz crystal microbalance(EQCM), suggesting that the electrogenerated O ·- 2 was adsorbed on the surface of the Pt electrode. The one-electron reduction of oxygen in this system was also confirmed by using chronocoulometry. The scavenging activities of two kinds of antioxidants(ascorbic acid and cysteine) were examined and compared.
文摘Dynamical model of coupled electrode BZ reaction system is established based on FKN mechanism and Oregonator model.Under certain conditions,the effect of electrode current on BZ electrochemical reaction system is discussed.By means of stability analysis of three-variable system,limit cycle oscillatory regime of the electrode reaction phase is calculated numerically.It turns out that limit cycle oscillation can appear in electrode phase under a fixed current when the bulk phase is at a steady state.Meanwhile,external electrode current can lead to non-synchronization of bulk phase and electrode reaction phase.
