Two more MOF@CNT films were prepared in the same way. A CNT anode film (42 mm diameter) was filtered out a toluene dispersion of 15 mg of the CNTs on a Whatmann filter paper (diameter 55 mm). The CNT film (42 mm diameter) on the filter was dried and peeled off the filter paper and placed onto an ITO-coated glass (50mm × 50mm × 2mm). On top of the CNT film, filter papers and three MOF@CNT films were placed alternatively. Each layer was soaked with OMIM-Cl. On the top MOF@CNT film, another ITO-coated glass was placed, and the two glass plates were sandwiched by two clips.