Journal
ACS NANO
Volume 7, Issue 6, Pages 5453-5462Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn401450s
Keywords
acicular nanorod; asymmetric supercapacitor; cobalt sulfide; flexible; RuO2
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Funding
- National Natural Science Foundation [51002059, 21001046, 91123008]
- 973 Program of China [2011CB933300]
- Program for New Century Excellent Talents of the University In China [NCET-11-0179]
- Natural Science Foundation of Hubei Province [2011CDB035]
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We have successfully fabricated flexible asymmetric supercapacitors (ASCs) based on acicular Co9S8 nanorod arrays as positive materials and Co3O4@RuO2 nanosheet arrays as negative materials on woven carbon fabrics. Co9S8 nanorod arrays were synthesized by a hydrothermal sulfuration treatment of acicular Co3O4 nanorod arrays, while the RuO2 was directly deposited on the Co3O4 nanorod arrays. Carbon cloth was selected as both the substrate and the current collector for its good conductivity, high flexibility, good physical strength, and lightweight architecture. Both aqueous KOH solutions and polyvinyl alcohol (PVA)/KOH were employed as electrolyte for electrochemical measurements. The as-fabricated ASCs can be cycled reversibly In the range of 0-1.6 V and exhibit superior electrochemical performance with an energy density of 1.21 mWh/cm(3) at a power density of 13.29 W/cm(3) in aqueous electrolyte and an energy density of 1.44 mWh/cm(3) at the power density of 0.89 W/cm(3) in solid-state electrolyte, which are almost 10-fold higher than those reported In early ASC work. Moreover, they present excellent cycling performance at multirate currents and large currents after thousands of cycles. The high-performance nanostructured ASCs have significant potential applications in portable electronics and electrical vehicles.
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