Lee Heon, Lee Won-June, Park Young-Kwon, Ki Seo Jin, Kim Byung-Joo, Jung Sang-Chul
Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Korea.
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea.
Nanomaterials (Basel). 2018 Mar 25;8(4):190. doi: 10.3390/nano8040190.
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.
采用一种创新的液中等离子体方法，即液相等离子体（LPP）法，合成了负载在氮掺杂活性炭粉末上的氧化铁纳米颗粒。通过使用氯化铵反应物溶液的一次LPP反应制备氮掺杂碳（NC），并通过使用氯化铁反应物溶液的二次LPP反应制备氧化铁/NC复合材料（IONCC）。在1小时的LPP反应后，3.77原子%的氮组分均匀地形成在活性炭（AC）表面。尺寸为40~100nm的氧化铁纳米颗粒在LPP反应后均匀地浸渍在NC表面，并通过X射线光电子能谱和X射线衍射鉴定为Fe₃O₄。NC和IONCC表现出赝电容特性，其比电容和循环稳定性优于裸AC。NC表面的氮含量提高了兼容性和电荷转移速率，含氧化铁的复合材料表现出较低的等效串联电阻。
