Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 41, Pages 12759-12767Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta12736b
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Funding
- Board of Research in Nuclear Sciences (BRNS), Government of India [2009/37/16/BRNS]
- Council of Scientific and Industrial Research (CSIR), Government of India
- Department of Science and Technology (DST), Government of India through an 'INSPIRE Faculty Award' [IFA12-ENG-09]
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This study demonstrates a scheme to design and fabricate a novel 1D core/shell Ni/NiO nano-architecture electrode as a pseudocapacitor with significantly improved capacitive performance through hydrogenation. The specific capacitance of the as prepared 1D core/shell Ni/NiO nanoheterostructure (717 F g(-1) at a scan rate of 2 mV s(-1)) is nearly 1635 F g(-1) after the hydrogenation. The improved pseudocapacitive properties of hydrogenated Ni/NiO nano-heterostructures are attributed to the incorporation of the hydroxyl groups on the NiO surface due to hydrogenation, where the metallic Ni nanowire core of this unique 1D core/shell heterostructure serves as the efficient channel for the fast electron conduction to the current collector. The H-Ni/NiO nanoheterostructures exhibit good rate capability (retaining nearly 60% of their initial charge) and good long-term cycling stability with an excellent specific energy and power density of 49.35 W h kg(-1) and 7.9 kW kg(-1), respectively, at a current density of 15.1 A g(-1). This study demonstrates that the H-Ni/NiO nano-heterostructure is very promising for next generation high-performance pseudocapacitors.
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