Another added advantage of this composition and preparation is that the MWCNTs and the inorganic electrocatalysts are readily exposed to the environment.This is a significant improvement from our previous results, in which a mechanical polishing methodology was applied to the composite surface to remove the thin layer of PS that covered the conductive and catalytic materials. An oxygen plasma process was also proposed by our group to effectively remove the PS layer and thus expose the MWCNTs underneath.However, oxygen plasma exposure could damage the chemical structure of the inorganic catalysts or even deactivate their electrocatalytic properties.