Carbon nanotube-zinc oxide electrode and gel polymer electrolyte for electrochemical supercapacitors

The electrochemical supercapacitors (ESs) were assembled with carbon nanotube (CNT) and zinc oxide (ZnO) composite as the electrode and gel polymer as the electrolyte. The CNT film was fabricated using screen-printing method and ZnO was deposited by ultrasonic spray pyrolysis (USP) in different time from 2 to 30 min. The analysis of cyclic voltammetry (CV) shows that the ESs of CNTs with ZnO deposited for 5 min exhibited the optimized electrochemical capacitive properties, and the specific capacitance reaches 126.3 F/g by CV test, much better than that of the pure CNTs. © 2009 Elsevier B.V. All rights reserved.