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电化学  2014 

离子液体限域于硅胶纳米孔道中的电化学行为研究(英文)

DOI: 10.13208/j.electrochem.130301, PP. 121-127

Keywords: 离子液体,硅胶,电化学行为,限域效应

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Abstract:

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80oC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63.5~200mV;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.

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