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Hierarchical TiN Nanoparticles Assembled Nanopillars for Flexible Supercapacitors with High Volumetric Capacitance

Abstract

Titanium nitride (TiN) is an attractive electrode material in fast charging/discharging supercapacitors because of the excellent conductivity. However, the low capacitance and mechanical brittleness of TiN restrict itself for further application in flexible supercapacitor with high energy density, thus, it is still a challenge for rational designing TiN electrode with both high electrochemical and mechanical properties. Herein, the hierarchical TiN nanoparticles assembled nanopillars (H-TiN NPs) array as binder free electrode are obtained by nitriding of hierarchical titanium dioxide (TiO2) nanopillars, which is produced by a simple hydrothermal treatment of anodic TiO2 nanotubes (NTs) array in water. The porous TiN nanoparticles connect each other to form ordered nanopillars arrays, effectively providing larger specific surface area and more active sites for charge storage. The H-TiN NPs deliver a high volumetric capacitance of 120 F cm-3 at 0.83 A cm-3, which is better than that of TiN NTs arrays (69 F cm-3 at 0.83 A cm-3). After assembling into all-solid-state devices, the H-TiN NPs based supercapacitors have an outstanding volumetric capacitance of 5.9 F cm-3 at 0.02 A cm-3 and a high energy density of 0.53 mWh cm-3. Our results reveal a new strategy to optimizate the supercapacitive performance of metal nitride.

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Publication details

The article was received on 21 Feb 2018, accepted on 12 Apr 2018 and first published on 12 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01485J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Hierarchical TiN Nanoparticles Assembled Nanopillars for Flexible Supercapacitors with High Volumetric Capacitance

    P. Qin, X. Li, B. Gao, J. Fu, L. Xia, X. zhang, K. Huo, W. Shen and P. K. Chu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01485J

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