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In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors.
- Source :
- Journal of Materials Chemistry A; 9/14/2018, Vol. 6 Issue 34, p16308-16315, 8p
- Publication Year :
- 2018
-
Abstract
- Hierarchical nanostructures with highly exposed active surfaces for use in high-performance pseudocapacitors have attracted considerable attention. Herein, we developed a one-step method for the in situ growth of (NH<subscript>4</subscript>)<subscript>2</subscript>V<subscript>10</subscript>O<subscript>25</subscript>·8H<subscript>2</subscript>O urchin-like hierarchical structures on highly conductive nickel foam substrates for use as advanced electrodes for all-solid-state asymmetric supercapacitors. The in situ growth of (NH<subscript>4</subscript>)<subscript>2</subscript>V<subscript>10</subscript>O<subscript>25</subscript>·8H<subscript>2</subscript>O urchin-like hierarchical structures delivers a specific capacitance of 1530 F g<superscript>−1</superscript> at a current density of 1.5 A g<superscript>−1</superscript>, and retains 95.1% of the initial capacitance after 10 000 cycles, owing to the advantages of the urchin-like hierarchical structure such as more active sites for electrochemical reactions, as well as a shortened diffusion length for the charge carriers due to a binder-free effect, which exceeds that of most recently reported vanadates and polyvanadates. The as-assembled all-solid-state (NH<subscript>4</subscript>)<subscript>2</subscript>V<subscript>10</subscript>O<subscript>25</subscript>·8H<subscript>2</subscript>O@Ni//PVA/KOH//RGO@Ni device exhibits a comparable capacity of 92.2 F g<superscript>−1</superscript> at a current density of 0.4 A g<superscript>−1</superscript> and excellent cycling performance through 5000 cycles. Our study provides rational guidance toward the design of novel hierarchical nanostructures of polyvanadate for solid-state supercapacitors with superior electrochemical performances in long-term cycling stability and high energy density. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 6
- Issue :
- 34
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 131494556
- Full Text :
- https://doi.org/10.1039/c8ta05706k