【摘要】 利用表面增强拉曼光谱(SERS)研究了室温离子液体1-丁基-3-甲基咪唑氟硼酸盐([BMIM]BF4)中SCN-在Pt电极表面的吸附行为.研究结果表明,离子液体中SCN-在较宽的电位范围内吸附在Pt电极上,且SCN-的吸附方式随着电位区间的变化而变化,在不同的电位区间内检测到了不同的Stark位移:-0.9~0.4 V约为34 cm-1/V,对应于S端吸附;-1.6~-1.2 V约为40 cm-1/V,该区间以N端吸附为主,中间电位区间为吸附方式的转变区,且Pt电极在离子液体[BMIM]BF4中的零电荷电位约为-1.1 V(vs.Pt).更多还原

【Abstract】 The adsorption behavior of thiocyanate(SCN-) on the Pt electrode in the room-temperature ionic liquids of 1-n-butyl-3-methylimidazolim tetrafluoroborate(BF4) was investigated by electrochemical in situ surface enhanced Raman spectroscopy(SERS).The results revealed that SCN-adsorbed onto Pt surface in a wide potential region,and the adsorption behavior of SCN-changed with the variation of the potential.Different Stark effects were observed in different potential regions,i.e.the S—Pt bonding exhibited the Stark shift of 34 cm-1/V over the range from-0.9 V to 0.4V,and Stark shift of 40 cm-1/V over the range from-1.6 V to-1.2 V for the N—Pt interaction.There is a transition region for the S- or N-adsorption between-0.9 V and-1.1 V.The change in the Stark effect in the different potential regions suggests that the potential of zero charge(p-zc) of the BF4-Pt system is around-1.1 V(vs.Pt).更多还原