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Hydrothermal Self‐assembly Synthesis of Mn 3 O 4 /Reduced Graphene Oxide Hydrogel and Its High Electrochemical Performance for Supercapacitors
Author(s) -
Li Li,
Hu Zhongai,
Yang Yuying,
Liang Pengju,
Lu Ailian,
Xu Huan,
Hu Yingying,
Wu Hongying
Publication year - 2013
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201300324
Subject(s) - x ray photoelectron spectroscopy , dielectric spectroscopy , chemistry , graphene , supercapacitor , oxide , transmission electron microscopy , scanning electron microscope , electrochemistry , analytical chemistry (journal) , hydrothermal synthesis , electrolyte , chemical engineering , microstructure , hydrothermal circulation , nanotechnology , electrode , materials science , crystallography , composite material , organic chemistry , chromatography , engineering
In the present work Mn 3 O 4 /reduced graphene oxide hydrogel (Mn 3 O 4 ‐rGOH) with three dimensional (3D) networks was fabricated by a hydrothermal self‐assembly route. The morphology, composition, and microstructure of the as‐obtained samples were characterized using powder X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TG), atomic absorption spectrometry (AAS), field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM). Moreover, the electrochemical behaviors were evaluated by cyclic voltammogram (CV), galvanostatic charge‐discharge and electrochemical impedance spectroscopy (EIS). The test results indicated that the hydrogel with 6.9% Mn 3 O 4 achieved specific capacitance of 148 F·g −1 at a specific current of 1 A·g −1 , and showed excellent cycling stability with no decay after 1200 cycles. In addition, its specific capacitance could retain 70% even at 20 A·g −1 in comparison with that at 1 A·g −1 and the operating window was up to 1.8 V in a neutral electrolyte.