期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 437, 期 -, 页码 304-310出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.08.060
关键词
Graphene; MnO2; Porous material; Hybrid; Symmetric supercapacitor
资金
- National Basic Research Program of China [2012CB933402]
A simple hard template method and hydrothermal process have been employed to fabricate a self-standing hierarchical porous MnO2/graphene film. Thus-constructed electrode materials for binder-free supercapacitors exhibit a high specific capacitance of 266.3 F g(-1) at the density of 0.2 A g(-1). Moreover, the two-electrode device demonstrates an excellent rate capability and cycling stability with capacitance retention of 85.1% after 2000 charge-discharge cycles at a current density of 1 A g(-1). The porous nano-structured design can effectively improve the specific surface areas and account for the shorter relaxation time for the electrodes, resulting in a high electrochemical performance. (c) 2014 Elsevier Inc. All rights reserved.
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