Journal
ACS NANO
Volume 7, Issue 6, Pages 5430-5436Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn401402a
Keywords
NixCo2x(OH)(6x); TiN NTA; self-standing electrode; supercapacitors; pseudocapacitive performance
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Funding
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-202-2]
- National Natural Science Foundation of China [21275151, 21271180]
- Doctoral Fund of Shandong Province [BS2012NJ011]
- Key Technology Research Projects of Qingdao [12-4-1-24-gx]
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NixCo2x(OH)(6x), as a precursor of intensively studied NiCo2O4, has been directly deposited into self-standing titanium nitride nanotube array (TiN NTA) grid monolithic supports to form a coaxial nanostructured electrode for supercapacitors. With TIN NTA substrates providing a large surface area, fast electron transport, and enhanced structure stability, this NixCo2x(OH)(6x)/TiN electrode exhibits superior pseudocapacitive performance with a high specific capacitance of 2543 F g(-1) at 5 mV s(-1), remarkable rate performance of 660 F g(-1) even at 500 mV s(-1), and promising cycle performance (about 6.25% capacitance loss for 5000 cycles). Interestingly, the NixCo2x(OH)(6x)/TiN NTA electrode outperforms the NiCo2O4/TiN NTA electrode, indicating that this self-standing NixCo2x(OH)(6x)/TiN NTA monolith is a promising candidate for high-performance supercapacitor applications.
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