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Nanomaterials (Basel). 2018 Mar 25;8(4). pii: E190. doi: 10.3390/nano8040190.

Liquid Phase Plasma Synthesis of Iron Oxide Nanoparticles on Nitrogen-Doped Activated Carbon Resulting in Nanocomposite for Supercapacitor Applications.

Author information

1
Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Korea. honylee@hanmail.net.
2
Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Korea.
3
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea. catalica@uos.ac.kr.
4
Department of Environmental Engineering, Gyeongnam National University of Science and Technology, Jinju 52725, Korea. seojinki@gmail.com.
5
R&D Division, Korea Institute of Carbon Convergence Technology, Jeonju 54853, Korea. kimbj2015@gmail.com.
6
Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Korea. jsc@sunchon.ac.kr.

Abstract

Iron oxide nanoparticles supported on nitrogen-doped activated carbon powder were synthesized using an innovative plasma-in-liquid method, called the liquid phase plasma (LPP) method. Nitrogen-doped carbon (NC) was prepared by a primary LPP reaction using an ammonium chloride reactant solution, and an iron oxide/NC composite (IONCC) was prepared by a secondary LPP reaction using an iron chloride reactant solution. The nitrogen component at 3.77 at. % formed uniformly over the activated carbon (AC) surface after a 1 h LPP reaction. Iron oxide nanoparticles, 40~100 nm in size, were impregnated homogeneously over the NC surface after the LPP reaction, and were identified as Fe₃O₄ by X-ray photoelectron spectroscopy and X-ray diffraction. NC and IONCCs exhibited pseudo-capacitive characteristics, and their specific capacitance and cycling stability were superior to those of bare AC. The nitrogen content on the NC surface increased the compatibility and charge transfer rate, and the composites containing iron oxide exhibited a lower equivalent series resistance.

KEYWORDS:

activated carbon powder; iron oxide nanoparticle; liquid phase plasma; nitrogen-doped carbon; pseudo-capacitive characteristics

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