Needle-like MnO2/activated carbon nanocomposites derived from human hair as versatile electrode materials for supercapacitors

被引：49
作者：
Deng, Dian [1 ]
Kim, Byoung-Suhk [2 ]
Gopiraman, Mayakrishnan [1 ]
Kim, Ick Soo [1 ]
机构：
[1] Shinshu Univ, Natl Univ Corp, Nano Fus Technol Res Lab, Inst Fiber Engn IFES,Div Frontier Fibers,ICCER, Ueda, Nagano 3868567, Japan
[2] Chonbuk Natl Univ, Dept Organ Mat & Fiber Engn, Jeonju Si 561756, Jeollabuk Do, South Korea
来源：
RSC ADVANCES | 2015年 / 5卷 / 99期
关键词：
MANGANESE OXIDE; ACTIVATED CARBON; PERFORMANCE; GRAPHENE; COMPOSITES; CATALYST; NANOSHEETS; NANOTUBES; EFFICIENT; GRAPHITE;
D O I：
10.1039/c5ra16624a
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Bio-waste material, human hair, was used as a source to prepare activated carbon (ACs) by a simple NaOH activation method. MnO2 with a needle like structure was successfully decorated on ACs by a wet impregnation method. TEM images confirmed the needle-like morphology of MnO2 on ACs. The chemical state of Mn in MnO2/ACs was found to be +4, as confirmed by XPS analysis. Other physicochemical properties of MnO2/ACs were investigated by means of SEM-EDS, XRD, Raman and XPS analyses. After complete characterization, the resultant nanocomposites with different MnO2-loading [MnO2/ACs((X : Y))] were employed as electrode materials for supercapacitors. Interestingly, the MnO2/ACs nanocomposites showed an excellent capacitance in three different electrolytes (1.0 M H2SO4, 1.0 M KOH and 1.0 M Na2SO4). The MnO2/ACs(1 : 12) achieved a maximum capacitance of 410 F g(-1), 345 F g(-1) and 291 F g(-1) in 1.0 M H2SO4, 1.0 KOH and 1.0 Na2SO4, respectively. To the best of our knowledge, this is the first MnO2-based carbon nanocomposite to show good capacitance performance in three different kinds of electrolytes. Moreover, the MnO2/ACs showed a capacitance of similar to 300 F g(-1) even after 500 cycles in 1.0 M H2SO4.
引用
收藏
页码：81492 / 81498
页数：7
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