Porous manganese oxide nanospheres for pseudocapacitor applications

被引:27
作者
Singu, B. S. [1 ]
Yoon, K. R. [1 ]
机构
[1] Hannam Univ, Dept Chem, Organ Nanomat Lab, Daejeon 305811, South Korea
基金
新加坡国家研究基金会;
关键词
SILAR; Thin films; Nanospheres; Manganese oxide; Supercapacitors; ELECTROCHEMICAL CAPACITORS; THIN-FILMS; SUPERCAPACITORS; MNO2; PERFORMANCE; ELECTRODES; CARBONIZATION; POLYANILINE; DEPOSITION; NANOWIRES;
D O I
10.1016/j.jallcom.2016.08.239
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mesoporous, uniform manganese oxide nanosphere thin films were grown on a stainless-steel substrate using the successive ionic layer adsorption and reaction (SILAR) method. The amorphous manganese oxide nanosphere thin films (AMONTFs) were characterized by grazing incidence X-ray diffraction (GI-XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). The GI-XRD analysis reveals that the manganese oxide nanosphere thin films were present in the forms of alpha-MnO2 and gamma-MnO2. XPS demonstrates that the thin films contain a mixture of manganese oxides: MnO2 (Mn4+) and MnOOH (Mn3+). The effect of the number of SILAR cycles on the morphology was observed systemically by FE-SEM and greatly influences the size of these unique nanospheres. The electrochemical properties of the AMONTF electrodes were analyzed by cyclic voltammetry (CV) and the galvanostatic charge-discharge (CD) method. The outcomes of the FE-SEM and electrochemical measurements reveal that the thin film obtained after 60 SILAR cycles has a uniform nanosphere size distribution and large specific capacitance. The manganese oxide thin films exhibit a maximum specific capacitance, energy, and power density of 262.0 F g(-1), 18.3 Wh kg(-1), and 7999.4 W kg(-1), respectively, in an aqueous 1 M Na2SO4 electrolyte solution. (C) 2016 Published by Elsevier B.V.
引用
收藏
页码:771 / 778
页数:8
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