Journal
SMALL
Volume 18, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202105185
Keywords
3D hollow nanocubes; energy density; mixed-metallic chalcogenides; Prussian-blue analogues
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2018R1A6A1A03025708, 2020R1A2B5B01002318]
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This study demonstrates the facile and cost-effective fabrication of nickel-cobalt-copper-sulfides/selenides hollow nanocubes with improved surface morphology and addition of sulfur and selenium ions. The prepared materials exhibit high charge storage performance, superior cycling stability, and good rate capability, making them suitable for high-performance energy storage devices. Furthermore, the materials show potential as positive electrodes in aqueous electrochemical hybrid capacitors with excellent energy and power densities.
The facile and cost-effective fabrication of hybrid nanostructures comprised of hollow mixed metallic chalcogenides has attracted growing interest in the development of high-performance energy storage devices. Herein, multi-component (nickel-cobalt-copper-sulfides/selenides (NCCS/NCCSe)) hollow nanocubes (HNCs) are prepared via a single-step sulfurization/selenization process. The NCCS material shows interior HNCs, and the NCCSe material exhibits slightly formed porous cubes. Both the prepared materials demonstrate higher charge storage performance than the precursor NCC NCs owing to the improved surface morphology and addition of sulfur and selenium ions. Particularly, the NCCS HNCs electrode reveals superior specific capacity (capacitance) (70.32 mAh g(-1) (666.20 F g(-1)) at 5 mA cm(-2)) along with excellent cycling stability of 108.6% even after 10 000 cycles. Interestingly, the electrode delivers a good rate capability of 83.5% at a high current density of 20 mA cm(-2). The feasibility of the battery-type NCCS HNCs as a positive electrode is explored by constructing an aqueous electrochemical hybrid capacitor (AEHC). The AEHC exhibits maximum energy and power densities of 23.15 Wh kg(-1) and 7899.08 W kg(-1), respectively. Remarkably, it demonstrates superior long-life cycling stability even after 10 000 cycles (120.6% retention). The suitability of AEHC for practical application is also tested by driving electronic devices.
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