Effect of Electrolytic Cations on a 3D Cd-MOF for Supercapacitive Electrodes.

A cadmium-based metal-organic framework () is synthesized in a facile manner at ambient temperature by an easy slow diffusion process. The three-dimensional (3D) structure of is authenticated by single-crystal X-ray diffraction studies and exhibits a cuboid-shaped morphology with an average edge length of ∼1.13 μm. The prepared was found to be electroactive in nature, which resulted in a specific capacitance of 647 F g at 4 A g by maintaining a retention of ∼78% over 10,000 successive cycles in the absence of any binder. Further, to distinguish the efficiency of electrodes, different electrolytes (NaOH, KOH, and LiOH) were explored, wherein NaOH revealed a higher capacitive response due to its combined effect of ionic and hydrated ionic radii. To investigate the practical applicability, an asymmetric supercapacitor (ASC) device is fabricated by employing as the positive electrode and activated carbon (AC) as the negative electrode, enabling it to light a commercial light-emitting diode (LED) bulb (∼1.8 V). The as-fabricated ASC device delivers comparable energy density and power density.