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- In page 12, line 18 -  ¡°Smaller unit-cell volume is favorable to improve electrochemical capability of the electrode¡± How can authors explain this? Only if when unit-cell volume is smaller, the crystallites are also smaller and lead to an increase of catalytic surface; have authors verified that, in the SEM images of the different films?
If authors have an explanation for the fact of the film 4% has lower unit cell volume than the 2% and 8% films, perhaps, that could explain why 4% film is the best.  


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