电沉积锡-铟合金电极在氢氧化钾溶液中的电化学性能

在电池集流体铜表面电沉积锡,锡溶解后易使其析氢量增加,电沉积铟在碱性溶液中抑氢效果好,但成本高,目前对锡-铟合金共沉积的效果研究甚少.用电化学方法在高能碱性锌锰电池集流体铜电极表面沉积Sn,In和Sn-In合金.研究了Sn,In和Sn-In合金电极在1 mol/L KOH溶液中的析氢电化学性能和电化学稳定性,测定了其在相同溶液中的循环伏安曲线和交流阻抗图谱.结果表明:沉积In和Sn-In合金的电极比铜电极的析氢过电位分别提高了569 mV和488 mV,有效地抑制了氢气析出;在无汞化电池工业中,用价格低廉且稳定性较好的Sn-In合金共沉积电极代替In沉积电极具有广阔的应用前景.

Electrochemical Properties of Copper Electrode Coated with Sn-In Alloy Electrochemical Plating in KOH Solution

Sn,In,and Sn-In alloy coatings were deposited on the surface of current collector copper electrode via electrochemical route.The hydrogen evolution electrochemical properties and electrochemical stabilities of the copper electrodes coated with electrochemical Sn,In,and Sn-In alloy in 1 mol/L KOH solution were studied,based on the measurement of the circular volt-ampere curves and electrochemical impedance spectroscopy.It was found that the copper electrodes coated with In and Sn-In alloy coatings had higher hydrogen evolution potentials than the uncoated copper electrode,i.e.,the hydrogen evolution potentials for the coated copper electrodes were larger than that of the uncoated one by 569 mV and 488 mV,respectively.In other words,the coated copper electrodes were capable of restricting hydrogen evolution more effectively than the uncoated electrode.It was therefore anticipated that the cost-effective Sn-In alloy coated copper electrode of better ability to resist hydrogen evolution could find promising application in mercury-free battery industry,as the replacement of conventional In-coated copper electrode.