Synthesis of Co1-xFex Hydroxide Nanoplatelets and Its Electrochemical Performances as Supercapacitor Electrode Materials

Co-Fe layered double hydroxides (Co1-xFex LDHs) were synthesized by a chemical co-precipitation method. It was found that the molor ratio of Co to Fe had a significant effect on the electrochemical activity. The specific capacitance of 869 F g(-1) was achieved when the molor ratio of Co to Fe was equal to 0.74:0.26. The Co0.74Fe0.26 LDH sample had a BET specific surface area of 202.9 m(2) g(-1) and total pore volume of 0.6 cm(3) g(-1), which led to the high liquid-solid interfacial area and further increased the utilization of the active materials. Additionally, the Co0.74Fe0.26 LDH electrode exhibited a good electrochemical stability with beyond 99.5% of the initial capacitance over 1000 consecutive cycles at 1 A g(-1). It is a promising electrode material for supercapacitor. (C) The Electrochemical Society of Japan, All rights reserved.