Electrochemical study of the IPMCs

Beginning at position 1, the voltage is apphed and the reduction of platinum oxide starts at approximately +0.6 V (versus SCE). It is proposed that the following chemical reaction is the reduction reaction  

Conversely, in the cathodic scan, the deflection abruptly increases below +0.42 V compared to SCE, due to the reactivation of the platinum  

After PtO decomposes into platinum hydroxide and platinum, hydrogen absorption appears between approximately +0.2 V and —0.25 V (versus SCE)  

Equations (2.24)-(2.30) provide a fundamental guideline to predict the direction of bending depending upon the operational voltage in connection with the surface reactions involved. The CV results reflect the associated surface reactions and the related electromechanical behavior of IPMCs. 

30 Current density vs applied potential (Two-electrode test). Reprinted from [Kim and Kim (2006)]. 

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