Journal
SYNTHETIC METALS
Volume 166, Issue -, Pages 33-39Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2013.01.002
Keywords
Polypyrrole; Graphite oxide; Composite; Supercapacitor; Electrochemical performance
Funding
- National Natural Science Foundation of China [61205182]
- Scientific and Technological Innovation Project of Fujian Province [2010H2005]
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Polypyrrole/graphite oxide (PPy/GO) composites are successfully prepared via in situ chemical polymerization with various feed ratios of pyrrole (Py) to graphite oxide (Py:GO = 0.5:1, 1:1,3:1, 5:1). The electrochemical performance of the composites is determined in a three-electrode cell using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The relationship between properties of PPy/GO composites and effect of the feed ratio of pyrrole to GO is investigated, and the results indicate that the thermal stability, electrical and electrochemical properties of the composites are strongly influenced by the feed ratios. The electrical conductivities of the PPy/GO composites are 1.27 S cm(-1) (Py:GO = 3:1) and 6.25 S cm(-1) (Py:GO = 5:1), which are significantly larger than that of pristine PPy and GO. The PPy/GO composites exhibit very high specific capacitance and low charge transfer resistance. Especially, the specific capacitance of the PPy/GO composites (Py:GO = 3:1) reaches 249 F g(-1) at discharge current density of 2 mA cm(-2), while the charge transfer resistance is only 0.12 n. The fabricated PPy/GO composites can be used for the development of new applications for supercapacitor. (C) 2013 Elsevier B.V. All rights reserved.
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