슈퍼커패시터 활용성 자가조립된 폴리아닐린, 그래핀 옥사이드 그리고 피트산으로 구성된 다층 초박막

Abstract

This article describes synthesis and electrochemical properties of layer-by-layer self-assembled multilayer film composed of polyaniline (PANi), graphene oxide (GO) and phytic acid (PA), whereby the GO was electrochemically reduced to ERGO, resulting in (PANi/ERGO/PANi/PA)10 film electrode. Especially, we examined the possibility to improve the volu- metric capacitive property of (PANi/ERGO)20 film electrode via combining a spherical hexakisphosphate PA nanoparticle into the multilayer film that would dope PANi properly and also increase the porosity and surface area of the electrode. The elec- trochemical performances of the multilayer film electrodes were investigated using a three-electrode configuration in 1 M H2SO4 electrolyte. As a result, the (PANi/ERGO)20 electrode showed the volumetric capacitance of 666 F/cm 3 at a current density of 1 A/cm 3 , which was improved to the volumetric capacitance of 769 F/cm 3 for the (PANi/ERGO/PANi/PA)10 elec- trode, in addition to the cycling stability maintained to 79.3% of initial capacitance after 1000 cycles. Thus, the electrochemi- cal characteristics of the (PANi/ERGO)20 electrode, which was densely packed by π-π stacking between the electron-rich conjugate components, could have been improved through structural modification of the multilayer film via combining a spherical hexakisphosphate PA nanoparticle into the multilayer film.