Synthesis and electrochemical properties of Ni-BTC/RGO composites

Abstract

In order to prepare capacitor materials with low cost, higher specific capacitance and better cycle stability, the graphene-based nickel-containing metal organic framework material (Ni-BTC/RGO) was prepared by electrochemical method to study the synthesis conditions of Ni-BTC and the electrochemical properties of Ni-BTC/RGO. A series of Ni-BTC materials under different conditions were analyzed by XRD. SEM, cyclic voltammetry and constant current charge-discharge tests were carried out for Ni-BTC, RGO and Ni-BTC/RGO. The results show that working voltage of 6 V, reaction time of 3 h, and reaction system temperature of 35 ℃ are optimum synthesis conditions of Ni-BTC; Ni-BTC and RGO are successfully combined and RGO has no effect on the structure of Ni-BTC; the composites mainly exhibit pseudocapacitive electrochemical behavior. At the current density of 0.5 A·g-1, the specific capacitance of Ni-BTC/RGO is 468.72 F·g-1, and the power density is 0.249 W·g-1; after 500 cycles at the current density of 1.0 A·g-1, the specific capacitance retention rate is 50.08%.

Keywords

• electrochemical method
• nickel based organometallic framework
• ni-btc/rgo
• electro-chemical properties