화학공학소재연구정보센터
Electrochimica Acta, Vol.127, 139-145, 2014
Preparation of High-performance Covalently Bonded Polyaniline Nanorods/Graphene Supercapacitor Electrode Materials using Interfacial Copolymerization Approach
In this article, the polyaniline nanorods/graphene sheet composites (G-PANI) with covalent bond were synthesized through interfacial copolymerization of aniline and functionalized graphene (G-PPD) obtained by in situ reduction of graphene oxide and functionalization with para-phenylenediamine (PPD). During the interfacial polymerization, the monopolymerization of aniline and copolymerization of aniline and G-PPD are carried out simultaneously, which produce a mixture of PANI nanorods and G-PANI. Not only the homopolymer possesses one-dimensional structure, but also the graphene surface was covered evenly by the PANI nanorods. As comparison with conventional synthesis methods of PANI, the interfacial polymerization can produce large-scale one-dimensional PANI nanorods, which can form a loose crisscross aggregation. Even when it is grafted onto graphene sheet, the nanorod morphology is remained. The cyclic voltammetry (CV) and charge-discharge tests confirm that the G-PANI has higher electrochemical activity and higher capacitive properties over those of neat PANI nanorods. At the current density of 1 mAcm(-2), the specific capacitance of G-PANI and PANI nanorods are 909 Fg(-1) and 772 Fg-1, respectively. Especially, the specific capacitance of G-PANI has 62% enhancement over that of PANI nanorods at high current density of 50 mAcm-2. The remarkable improved capacity performance can be attributed to the enhanced mass transfer process brought from the loose nanostructure aggregation of G-PANI, as well as the reduced charge transfer resistance caused by the highly conductive graphene and strong interfacial interaction between PANI and graphene via covalent bond. (C) 2014 Elsevier Ltd. All rights reserved.