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探讨铅在碱性木糖醇体系中的电沉积行为;采用循环伏安法研究碱性木糖醇体系的电化学稳定性以及铅在阴极的电沉积过程;利用线性扫描伏安法求解体系的表观活化能、表观传递系数和交换电流密度;采用计时电流法判断铅在电极上的成核方式。结果表明:在扫描电压范围-1.3～0.75V(vsHg/HgO)内,木糖醇在碱性溶液中无氧化还原反应;由线性扫描伏安法求得表观活化能为35.15kJ/mol,表观传递系数为1.56,交换电流密度为9.65×10-5A/cm2;铅的成核方式遵循三维成核,并取决于过电位。
To investigate the electrodepositing behavior of lead in xylitol-based system. The electrochemical stability of the xylitol-based system and the electrodeposition of lead at the cathodic electrode were investigated by cyclic voltammetry. The cyclic voltammetry Apparent activation energy, apparent transfer coefficient and exchange current density, and the chronoamperometry was used to determine the nucleation of lead on the electrode. The results showed that xylitol had no redox reaction in alkaline solution within the scan voltage range of -1.3 ~ 0.75V (vsHg / HgO). The apparent activation energy calculated by linear sweep voltammetry was 35.15kJ / mol, The apparent transfer coefficient is 1.56 and the exchange current density is 9.65 × 10-5 A / cm2. Lead nucleation follows three-dimensional nucleation and depends on overpotential.