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通过溶胶-凝胶法制备了硅胶包载咪唑类离子液体修饰电极,研究其与体相离子液体不同的伏安行为;另一方面,制备不同离子液体含量为15%~28%的包载离子液体硅胶和涂覆离子液体硅胶,用电化学阻抗研究其在20oC到80 oC下电导率的变化情况.异常的电化学行为主要表现在:1)硅胶包载离子液体导致Fc/Fc+电对的半波电位正移63.5~200 mV;2)当离子液体限域于硅胶纳米孔道中时,离子液体的电化学稳定性变差;3)包载离子液体硅胶的电导率要比涂覆离子液体的电导率高29.6%~136%.由此推断,可能是由于离子液体充满硅胶孔腔和孔道从而形成了纳米网状的离子液体导电介质.这些结果表明,硅胶包载离子液体不仅可以作为修饰电极的优良载体,而且也有助于理解离子液体限域于硅胶纳米孔道中的限域效应.
Prepared by sol-gel method Imidazole ionic liquid modified electrode coated with silica gel to study its voltammetric behavior with the bulk liquid ionic liquid; the other hand, the preparation of different ionic liquid content of 15% to 28% Liquid silica gel and ionic liquid silica gel, the electrochemical impedance spectroscopy at 20oC to 80 oC under the conductivity changes. Abnormal electrochemical behavior mainly in: 1) silica gel containing ionic liquid lead to Fc / Fc + The half-wave potential is positively shifted 63.5 ~ 200 mV; 2) When the ionic liquid is confined in the silica nanopore, the electrochemical stability of the ionic liquid becomes worse; 3) The ionic conductivity of the ionic liquid silica gel is higher than that of the ionic liquid Of the conductivity of high 29.6% ~ 136% .This can be inferred, probably due to the ionic liquid filled silica gel pores and pores to form a nano-mesh ionic liquid conductive medium.These results show that the silicone encapsulated ionic liquid can not only be used as a modification Electrode excellent carrier, but also help to understand the limited confinement effect of ionic liquid in the silica nanopore.