Substantial research has been devoted to deciphering the
technical complications in order to simplify the decal method.
Xie et al. [18,19] made significant efforts to correlate the MEA
structure with the different preparation steps involved in the
decal process and made valuable suggestions regarding the
effect of the type of decal substrates on the transfer rate of
catalyst layers and the effect of the fabrication method on the
micro-structure of electrodes.