A layer-by-layer approach for the construction of 2D (two dimensional) planar ultrathin supercapacitors of multi-stacked rGO (reduced grapheme oxide) and CNT (carbon nanotube) is disclosed. The 2D in-plane architecture can allow for the formation of an efficient electrical double layer and the utilization of the maximum active surface area of rGO nanosheets by using a CNT layer as a porous physical spacer to enhance the permeation of gel electrolyte inside the structure and reduce the agglomeration of rGO nanosheets along the out-of-plane axis. The electrochemical performance can be increased by controlling the number of layers and constructing serial/parallel tandem architectures. Furthermore, the LBL process can be extended to the fabrication of a large-sized ultrathin supercapacitor without diminishing its electrochemical properties, which can be important in a practical energy storage device.
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