Abstract
Nitrogen-doped carbon nanotubes (NCNTs) and iron oxide particles precipitated on nitrogen-doped carbon nanotubes (IONCNTs) were fabricated by a liquid phase plasma (LPP) process for applications to anode materials in supercapacitors. The nitrogen element and amorphous iron oxide nanoparticles were evenly disseminated on the pristine multiwall carbon nanotubes (MWCNTs). The electrochemical performance of the NCNTs and IONCNTs were investigated and compared with those of pristine MWCNTs. The IONCNTs exhibited superior electrochemical performance to pristine MWCNTs and NCNTs. The specific capacitance of the as-fabricated composites increased as the content of nitrogen and iron oxide particles increased. In addition, the charge transfer resistance of the composites was reduced with introducing nitrogen and iron oxide.
Highlights
The electrochemical capacitor has attracted considerable interest in recent years because it shows rapid recharge, long-term cycling performance, and high-power density [1,2,3]
This paper introduces a new strategy, the liquid phase plasma (LPP) process, which can fabricate nitrogen-doped carbon nanotubes (NCNT) and iron oxide particles precipitated on nitrogen-doped carbon nanotubes (IONCNTs) to improve the electrochemical performance of multiwall carbon nanotubes (MWCNTs) used as electrode materials in supercapacitors
NCNTs and IONCNTs as potential electrode materials of supercapacitors were prepared by the LPP process
Summary
The electrochemical capacitor ( called supercapacitor) has attracted considerable interest in recent years because it shows rapid recharge, long-term cycling performance, and high-power density [1,2,3]. Carbon-based materials (e.g., activated carbon, carbon nanotubes (CNTs), graphene, etc.) have excellent physicochemical and electrical performance and have attracted attention as electrode materials in supercapacitors. They have low specific capacitance compared to other carbon-based materials like porous carbon materials. It is generally known that the specific capacitance of CNTs is about 100 F/g, which is approximately half that of porous carbon, such as activated carbon (200 F/g) [7,8]. This is because CNTs have lower specific areas than activated carbon due to a deficiency of micropores.
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