Synthesis of Co(OH)2/USY composite and its application for electrochemical supercapacitors

A novel composite of Co(OH)2 and ultrastable Y molecular sieves was synthesized with an improved chemical precipitation method. The Co(OH)2/USY composite and its microstructure were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR). Co(OH)2/USY microstructure applied for the electrochemical energy storage displayed superior capacitive performance. Upon annealing at 100 °C, the maximum specific capacitance was up to 958 F/g, which was comparable to that of hydrated ruthenium oxide. Higher annealing temperatures larger than 100 °C only resulted in a decline of the specific capacitance.