In situ synthesis of nitrogen-doped graphene for supercapacitor applications

doi:10.19799/j.cnki.2095-4239.2024.1204

Abstract

Abstract:

Supercapacitors are important energy storage devices, and their electrochemical performance is intrinsically linked to the electrode materials. The storage capacity of supercapacitors can be enhanced by combining graphene and polyaniline to form a composite material. This is achieved using dual storage modes: bilayer capacitance and Faraday capacitance. In this study, polyaniline (PANI) nanowires were deposited onto graphene sheets via in situ polymerization. The morphology and composition of the doped PANI/graphene composite were characterized using scanning electron microscopy, Fourier-infrared spectroscopy, and X-ray diffractometry. The composite slurry was coated onto a nickel foam plate to prepare graphene composite electrodes, which were then assembled into supercapacitors. The electrochemical performance of the assembled capacitors was evaluated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The PANI/graphene composite exhibits good capacitance, cycling stability, and adaptability to high current densities. The mass-specific capacitance of the PANI/graphene composite was 336 F/g at a current density of 1 A/g. The specific capacitances of the graphene and graphite electrodes were 44% and 560.1% higher, respectively. The in situ polymerization method ensured strong interfacial bonding between PANI nanowires and graphene, enhanced the pseudocapacitance contributions, and significantly improved the specific capacitance of graphene supercapacitors. These findings promote the application of graphene in supercapacitors.

Key words: composite, polyaniline, nitrogen-doped, graphene, supercapacitor

CLC Number:

TB 332

Yunpeng ZHAO, Yanfang LI, Xinhao CUI, Haiyan SUN, Yingxue TENG. In situ synthesis of nitrogen-doped graphene for supercapacitor applications[J]. Energy Storage Science and Technology, 2025, 14(6): 2270-2277.

Figures/Tables 7

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