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One-step sulfuration synthesis of hierarchical NiCo 2 S 4 @NiCo 2 S 4 nanotube/nanosheet arrays on carbon cloth as advanced electrodes for high-performance flexible solid-state hybrid supercapacitors.
- Source :
-
RSC advances [RSC Adv] 2019 Jan 22; Vol. 9 (6), pp. 3041-3049. Date of Electronic Publication: 2019 Jan 22 (Print Publication: 2019). - Publication Year :
- 2019
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Abstract
- To obtain high-performance hybrid supercapacitors (HSCs), a new class of battery-type electrode materials with hierarchical core/shell structure, high conductivity and rich porosity are needed. Herein, we propose a facile one-step sulfuration approach to achieve the fabrication of hierarchical NiCo <subscript>2</subscript> S <subscript>4</subscript> @NiCo <subscript>2</subscript> S <subscript>4</subscript> hybrid nanotube/nanosheet arrays (NTSAs) on carbon cloth, by taking hydrothermally grown Ni-Co precursor@Ni-Co precursor nanowire/nanosheet arrays (NWSAs) as the starting templates. The optimized electrode of NiCo <subscript>2</subscript> S <subscript>4</subscript> @NiCo <subscript>2</subscript> S <subscript>4</subscript> hybrid NTSAs demonstrates an enhanced areal capacity of 245 μA h cm <superscript>-2</superscript> at 2 mA cm <superscript>-2</superscript> with outstanding rate capability (73% from 2 to 20 mA cm <superscript>-2</superscript> ) and cycling stability (86% at 10 mA cm <superscript>-2</superscript> over 3000 cycles). In addition, flexible solid-state HSC devices are assembled by using NiCo <subscript>2</subscript> S <subscript>4</subscript> @NiCo <subscript>2</subscript> S <subscript>4</subscript> hybrid NTSAs and activated carbon as the positive and negative electrodes, respectively, which manifest a maximum volumetric energy density of 1.03 mW h cm <superscript>-3</superscript> at a power density of 11.4 mW cm <superscript>-3</superscript> , with excellent cycling stability. Our work indicates the feasibility of designing and fabricating core/shell structured metal sulfides through such a facile one-step sulfuration process and the great potential of these materials as advanced electrodes for high-performance HSC devices.<br />Competing Interests: There are no conflicts to declare.<br /> (This journal is © The Royal Society of Chemistry.)
Details
- Language :
- English
- ISSN :
- 2046-2069
- Volume :
- 9
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- RSC advances
- Publication Type :
- Academic Journal
- Accession number :
- 35518986
- Full Text :
- https://doi.org/10.1039/c8ra10435b