Abstract
The local electrochemical activity of polytetrafluorethylene (PTFE) membranes coated with diamond-like carbon (DLC) was investigated using scanning electrochemical microscopy (SECM). During z-approach curves in the feedback mode of SECM unexpected local variations in the electron-transfer rate of [Fe(CN) 6] 3−/4− and [Ru(NH 3) 6] 3+/2+ were observed. This local heterogeneity of the electrochemical activity was further evaluated in a system adapted from SO 2 gas sensors. In this case, the Cu 2+/+ couple is used as dissolved reversible redox system. Reaction of SO 2 with Cu 2+ yields Cu + which is re-oxidized at the DLC-coated PTFE membrane. Gas permeation/tip-collection mode SECM experiments allowed visualizing the local pore distribution as sites where the SO 2 is permeating through the membrane and hence formation of Cu + takes place.
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