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通过改变非对称方波电位阶跃的各个参数,控制0.1 mol·L~(-1)KBr及0.05 mol·L~(-1)γ-吡啶甲酸体系(pH=9.5)中银的氧化还原循环(ORC)过程的氧化过电位、还原过电位及氧化电量。用扫描电镜观察不同参数的ORC过程对银电极表面微观形态的影响,并研究了电极表面形态的变化对表面增强喇曼散射(SERS)效应的影响。实验结果表明,还原过电位和ORC过程中的氧化电量对电极表面形态及SERS效应有较明显的影响。另外,还用电结晶理论及表面局域场增强理论对实验结果进行了讨论。
The redox cycles of silver in 0.1 mol·L ~ (-1) KBr and 0.05 mol·L -1 γ-picolinic acid (pH = 9.5) were controlled by changing the parameters of the unsymmetrical square-wave potential step ORC) process over-potential, reduction potential and oxidation of electricity. Scanning electron microscopy (SEM) was used to observe the effect of different parameters of ORC process on the morphology of silver electrode surface. The effect of surface morphology on the surface-enhanced Raman scattering (SERS) effect was also studied. The experimental results show that the reduction of overpotential and ORC oxidation process on the electrode surface morphology and SERS effects have a more significant impact. In addition, the experimental results are also discussed by using the theory of electrocrystallization and surface local field enhancement.