Synthesis of Nickel-Based Coordination Polymers From Multicarbonyl Cyclic Aza-Ligands and Their Supercapacitance Performance
Transition metal coordination polymers(CPs)contain transition metal ions or clusters with redox activity,and organic ligands with redox activity,thus giving rise to their great potential as the electrode materials in supercapacitors.A nickel-based coordination polymer Ni-PAD(PAD=N,N'-bis(1,2,4-triazolyl)pyromellidiimide)was synthesized by a simple solvothermal reaction,and its performance was,for the first time,investigated as the electrode materials for supercapacitors.The results show that the Ni-PAD electrode exhibits high discharge specific capacitance,great rate performance and reliable cycle stability in three-electrode systems.In the 1 M KOH solution,the maximum specific capacitance is estimated to be 1145 F·g-1 at a current density of 1 A·g-1.Upon increasing the current density to 2 A·g-1,the capacitance retention of the electrode is 43％after 1000 cycles.The asymmetric supercapacitors constructed by Ni-PAD as the positive electrode and rGO as the negative electrode display the energy density of 28.13 Wh·kg-1 and the power density of 0.76 kW·kg-1 at 1 A·g-1.The corresponding good supercapacitance performance is related to the redox activity and the small-sized nano/micro-particles for Ni-PAD.
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