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Capacitive Performances of Reduced Graphene Oxide Hydrogel Prepared by Using Sodium Hypophosphite as Reducer
Author(s) -
Liu Cuixian,
Han Gaoyi,
Chang Yunzhen,
Xiao Yaoming,
Li Yanping,
Li Miaoyu,
Zhou Haihan
Publication year - 2016
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.201500546
Subject(s) - chemistry , hypophosphite , sodium hypophosphite , graphene , cyclic voltammetry , oxide , horizontal scan rate , nuclear chemistry , sodium , inorganic chemistry , chemical engineering , electrochemistry , organic chemistry , layer (electronics) , electrode , electroplating , engineering
The hydrogels of reduced graphene oxide (rGOHGs) have been synthesized through treating GO with various concentrations of sodium hypophosphite (NaH 2 PO 2 ) under hydrothermal condition. The results reveal that the structure of rGOHGs changes along with the increase of the concentration of NaH 2 PO 2 . The rGO sheets prepared with low concentration of NaH 2 PO 2 exhibit more crimples and larger specific surface area than those prepared with high concentration of NaH 2 PO 2 . The measurements of the capacitive performances of rGOHGs reveal that the rGOHGs prepared with low concentration of NaH 2 PO 2 possess larger specific capacitance ( C s ) than that prepared with high concentration of NaH 2 PO 2 at low cyclic voltammetry scan rates. However, the rGOHGs prepared with high concentration of NaH 2 PO 2 possess larger C s at high scan rates, more stability and better high‐rate capability than those prepared at low concentration. It is believed that the structures and properties of rGOHGs can be adjusted by controlling the concentration of NaH 2 PO 2 according to the requirement.