铅在碱性木糖醇体系中的电沉积行为

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。

Lead electrodeposition from alkaline solutions containing xylitol

The electrodeposition of lead in alkaline solutions containing xylitol （1, 2, 3, 4, 5-pentahydroxypentane） was studied. The lead electrodeposition and the chemical stability of xylitol in alkaline solutions were investigated by cyclic voltammetry. Apparent activation energy, apparent transfer coefficient and exchange current density were obtained by linear sweep voltammetry. Initial stages of lead electrocrystallization were determined by chronoamperometry. Voltammograms of a AISI 316 stainless steel electrode in xylitol solution exhibit no current in the potential range of-1.3 V to 0.75 V （vs Hg/HgO）, implying that xylitol is stable to oxidation and reduction. The apparent activation energy, apparent transfer coefficient and exchange current density were calculated to be 35.15 kJ/mol, 1.56 and 9.65x10^-5 A/m^2. Analysis of the chronoamperometric responses implies three-dimensional growth of nuclei, with the type of nucleation depending on overpotential.