Journal
ELECTROCHIMICA ACTA
Volume 269, Issue -, Pages 62-69Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.02.141
Keywords
NiO; In-situ synthesis; Foamed sheets; Battery-type electrode; Supercapacitor
Categories
Funding
- Hebei Province Natural Science Foundation for Youth [B2015203350]
- China Postdoctoral Science Foundation [2015M581314]
- Research Foundation of Yanshan University [14LGA016]
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Herein we report an in-situ strategy for synthesizing NiO foamed sheet on Ni foam substrate which could achieve great improvement on the areal performance of battery-type supercapacitors. The anchored NiO foamed sheets are synthesized via a precursor growth step by hydrothermal oxidation, and followed by a pore-inducing step through heat treating. The physical characterizations indicate that this film product has a multi-level pore structure with high active surface area. As for electrode material, the anchored sheets could ensure excellent conductivity at the film/substrate interface, and the porous structure could form high free electron/ionic diffusion routes which facilitates the redox reactions for reversible energy storage. The electrochemical measurements show that the areal capacity of as-synthesized electrode could achieve 4.31-3.39 C cm(-2) at a wide current range of 10-200 mA cm(-2). The single supercapacitor device exhibits a high areal energy density of 9.84-9.45W h m(-2) at a wide power density of 100-2000 W m(-2). (C) 2018 Elsevier Ltd. All rights reserved.
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