Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electrodeposition and Capacitive Behavior of Films for Electrodes of Electrochemical Supercapacitors C. Shi • I. Zhitomirsky | Nanoscale Res Lett 2010 5 518-523 DOI s11671-009-9519-z SPECIAL ISSUE ARTICLE Electrodeposition and Capacitive Behavior of Films for Electrodes of Electrochemical Supercapacitors C. Shi I. Zhitomirsky Received 14 August 2009 Accepted 17 December 2009 Published online 8 January 2010 The Author s 2010. This article is published with open access at Abstract Polypyrrole films were deposited by anodic electropolymerization on stainless steel substrates from aqueous pyrrole solutions containing sodium salicylate and tiron additives. The deposition yield was studied under galvanostatic conditions. The amount of the deposited material was varied by the variation of deposition time at a constant current density. SEM studies showed the formation of porous films with thicknesses in the range of 0-3 m. Cyclic voltammetry data for the films tested in M Na2SO4 solutions showed capacitive behavior and high specific capacitance SC in a voltage window of V. The films prepared from pyrrole solutions containing tiron showed better capacitive behavior compared to the films prepared from the solutions containing sodium salicylate. A highest SC of 254 F g-1 was observed for the sample with a specific mass of 89 g cm-2 at a scan rate of 2 mV s-1. The SC decreased with an increasing film thickness and scan rate. The results indicated that the polypyrrole films deposited on the stainless steel substrates by anodic electropolymerization can be used as electrodes for electrochemical supercapacitors ES . Keywords Polypyrrole Film Sodium salicylate Tiron Supercapacitor Capacitance Electropolymerization C. Shi I. Zhitomirsky El Department of Materials Science and Engineering McMaster University 1280 Main Street West Hamilton oN L8S 4L7 Canada e-mail zhitom@ Introduction The development of hybrid and electric vehicles requires the use of efficient ES 1 which provide load-levelling during starting acceleration and braking. Polypyrrole is an attractive .
