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In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors

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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 (NH4)2V10O25·8H2O 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 (NH4)2V10O25·8H2O urchin-like hierarchical structures delivers a specific capacitance of 1530 F g−1 at a current density of 1.5 A g−1, 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 (NH4)2V10O25·8H2O@Ni//PVA/KOH//RGO@Ni device exhibits a comparable capacity of 92.2 F g−1 at a current density of 0.4 A g−1 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.

Graphical abstract: In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors

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Publication details

The article was received on 15 Jun 2018, accepted on 27 Jul 2018 and first published on 27 Jul 2018


Article type: Communication
DOI: 10.1039/C8TA05706K
Citation: J. Mater. Chem. A, 2018, Advance Article
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    In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors

    Y. Jiang, L. Jiang, Z. Wu, P. Yang, H. Zhang, Z. Pan and L. Hu, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA05706K

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