Improved electrochemical impedance response induced by morphological and structural evolution in nanocrystalline MnO2 electrodes
By Wei, Weifeng; Cui, Xinwei; Chen, Weixing & Ivey, Douglas G.
Published in Electrochimica Acta
2009
Abstract
The electrochemical cycling behavior of nanocrystalline MnO2 coatings with a defective antifluorite structure, prepared by anodic electrodeposition, was investigated in terms of morphological and structural evolution. MnO2 electrodes cycled at 100 mV s-1 exhibited improved electrochemical frequency response, compared with as-prepared electrodes. The improved frequency response is attributed to morphological and structural evolution from equiaxed oxide nanocrystals to petal-shaped, single-crystal nanosheets, which follows a dissolution-redeposition mechanism.