期刊
ELECTROCHIMICA ACTA
卷 91, 期 -, 页码 173-178出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.12.032
关键词
Graphene; Nickel oxide; Hydrothermal method; Porous materials; Electrochemical capacitor
资金
- Natural Science Foundation of China [11275121, 21241002]
- Innovation Program of Shanghai Municipal Education Commission [10YZ03, 10YZ05, 12YZ013]
- Natural Science Foundation of Shanghai [10DZ0500100, 10ZR1411300]
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes (ECNU)
- Laboratory of Chemical Engineering (ECUST)
- Chinese Academy of Sciences [12CS02]
A new porous graphene/NiO has been prepared successfully by hydrothermal method with graphene oxide solution, Ni(NO3)(2)center dot 6H(2)O and urea as raw materials. The as-prepared composite is characterized by X-ray diffraction, Raman, FT-IR, SEM, TEM and nitrogen adsorption/desorption. It is shown that graphene sheets are well decorated by the NiO nanoparticles to form a hierarchical nanostructures with rich porosity (ca. 2-5 nm) and large specific surface area (174.1 m(2) g(-1)). Electrochemical characterization demonstrates that the mesoporous graphene/NiO are capable of delivering a specific capacitance of 429.7 F g(-1) at the current density of 200 mAg(-1) and offer good capacitance retention of 86.1% at 1 A g(-1) after 2000 continuous charge-discharge cycles. These rich and evenly distributed porosity could reduce the transportation distance and offer a robust sustentation of OH- ions due to its ion-buffering reservoirs, ensuring that sufficient Faradaic reactions can take place at the surfaces of electroactive NiO nanoparticles. It suggests that the hierarchical nanostructure is helpful in improving the electrochemical performance of the oxide. (C) 2012 Elsevier Ltd. All rights reserved.
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