Journal
SMALL
Volume 19, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202206789
Keywords
conductive polymers; degradation simulations; micro-electrochemical energy storage (MEES); PEDOT; PSS; pseudocapacitive behaviors; scanning electrochemical microscopy (SECM); SiNWs nano-composite electrodes
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This study introduces scanning electrochemical microscopy (SECM) as a new technique for in situ characterization and acceleration of degradation processes of conducting polymers, aiming to study the conjugated/conducting polymer-based nanostructured electrodes used for micro-electrochemical energy storage (MEES).
Conducting polymers show attractive characteristics as electrode materials for micro-electrochemical energy storage (MEES). However, there is a lack of characterization techniques to study conjugated/conducting polymer-based nanostructured electrodes. Here, scanning electrochemical microscopy (SECM) is introduced as a new technique for in situ characterization and acceleration of degradation processes of conducting polymers. Electrodes of PEDOT:PSS on flat silicon, silicon nanowires (SiNWs) and silicon nanotrees (SiNTrs) are analyzed by SECM in feedback mode with approach curves and chronoamperometry. The innovative degradation method using SECM reduces the time required to locally degrade polymer samples to a few thousand seconds, which is significantly shorter than the time usually required for such studies. The degradation rate is modeled using Comsol Multiphysics. The model provides an understanding of the phenomena that occur during degradation of the polymer electrode and describes them using a mathematical constant A(0) and a time constant tau.
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