Synthesis of NiFeCo ternary layered hydroxides and their performances of electrochemical energy storage for solar cells

Ternary layered hydroxide are high-performance electrode materials for supercapacitors. In this study, nickel–iron-cobalt ternary layered hydroxides (NiFeCo-LDHs) with different nickel–iron molar ratios were grown on nickel foam using a one-step hydrothermal method. The effect of nickel–iron molar ratio on the electrochemical performance and morphology of NiFeCo-LDHs was investigated, and the electrode material at a nickel–iron molar ratio of 3:7 had better electrochemical performance up to 7.01F/cm 2 (at 1 mA/cm 2 ). The specific capacitance of the assembled hybrid supercapacitor reached 1575.00 mF/cm 2 at 3 mA/cm 2 . In addition, the fabricated all-solid-state hybrid capacitor（742.86 mF/cm 2 at 4 mA/cm 2 ) was capable of lighting an LED after charged by a solar cell. The results indicated that the electrochemical performance of NiFeCo-LDHs was affected by the nickel–iron mole ratio and demonstrated the potential application of NiFeCo-LDHs in electrochemical energy storage.