Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 12, Pages 10730-10742Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b00676
Keywords
renewable energy; hybrid capacitors; energy-storage materials; electrochemical charge storage; nanocomposites; electrodes; pseudocapacitors; electrochemical double-layer capacitors
Funding
- Universiti Malaysia Pahang [RDU 1503100, GRS 150328]
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A one-dimensional morphology comprising nanograins of two metal oxides, one with higher electrical conductivity (CuO) and the other with higher charge storability (Co3O4), is developed by electrospinning technique. The CuO-Co3O4 nanocomposite nanowires thus formed show high specific capacitance, high rate capability, and high cycling stability compared to their single-component nanowire counterparts when used as a supercapacitor electrode. Practical symmetric (SSCs) and asymmetric (ASCs) supercapacitors are fabricated using commercial activated carbon, CuO, Co3O4, and CuO-Co3O4 composite nanowires, and their properties are compared. A high energy density of, similar to 44 Wh kg(-1) at a power density of 14 kW kg(-1) is achieved in CuO-Co3O4 ASCs employing aqueous alkaline electrolytes, enabling them to store high energy at a faster rate. The current methodology of hybrid nanowires of various functional materials could be applied to extend the performance limit of diverse electrical and electrochemical devices.
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