Amorphous Cobalt Coordination Nanolayers Incorporated with Silver Nanowires: A New Electrode Material for Supercapacitors

The 2D amorphous cobalt coordination framework/silver nanowires nanocomposites (A‐CoL/Ag NC) are successfully synthesized by one‐step solution agitation at room temperature. The experimental data reveal that the hybrid provides sufficient contact between active materials and electrolyte, and facilitates the transfer of ions/electrons, resulting in high specific capacitance, high output potential, great rate capacity at high current density, and good cycle stability. As supercapacitor electrode materials, the as‐prepared A‐CoL/Ag NC electrode exhibits a great specific capacitance which can reach up to 1467 mF cm−2 at 1.0 mA cm−2, and 1060 mF cm−2 even at 10.0 mA cm−2. The A‐CoL/Ag NC// activated carbon asymmetric supercapacitor (AC ASC) displays a maximum energy density (110 W h kg−1 at 760 W kg−1) and maximum power density (6410 W kg−1 at 63 W h kg−1) in 3.0 m KOH. Moreover, the developed solid‐state A‐CoL/Ag NC//AC ASC has a broad operated potential window within 0–1.6 V, long cycle life (95.2% after cycling 7000 cycles), delivering an energy density of 151 W h kg−1 (at 790 W kg−1), and a power density of 7972 W kg−1 (at 70 W h kg−1). The well‐synthesized nanocomposite provides a novel way to synthesize prominent electrode materials for supercapacitors. Amorphous cobalt coordination framework nanolayers have been incorporated with silver nanowires as a new electrode material for high‐performance supercapacitors. The sufficient contact between amorphous cobalt coordination framework/silver nanowires nanocomposite and electrolyte facilitates the transport of ions and electrons. The hybrid nanomaterials exhibit excellent specific capacitance and better rate capability via a facile one‐step solution agitation at room temperature.