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Issue 32, 2016
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Scalable and bendable organized mesoporous TiN films templated by using a dual-functional amphiphilic graft copolymer for solid supercapacitors

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Abstract

Organized mesoporous titanium nitride (om-TiN) films with a large surface area, high porosity, and good interconnectivity were prepared on Ti substrates by nitration of TiO2 templated by using an amphiphilic graft copolymer, poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM). This resulted in a much higher specific capacitance compared with randomly organized TiN (ran-TiN) films. Upon addition of a small amount (2 wt%) of carboxylic-acid-functionalized carbon nanotubes (COOH-CNTs) to the om-TiN, the surface area, conductivity, and pore size further increased, leading to an improved specific capacitance of up to 213.6 F g−1 for solid supercapacitors with poly(vinyl alcohol) (PVA)/H3PO4 electrolyte. Large electrodes (15 cm × 15 cm) were successfully fabricated and their electrochemical performance did not change when bent. The PVC-g-POEM graft copolymer used for om-TiN formation was also applied as the matrix of a mechanically strong solid electrolyte, which further increased the capacitance up to 266.8 F g−1 and widened the potential window, demonstrating the dual functionality of the graft copolymer. This capacitance is the highest value observed for TiN-based solid symmetric supercapacitors.

Graphical abstract: Scalable and bendable organized mesoporous TiN films templated by using a dual-functional amphiphilic graft copolymer for solid supercapacitors

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Publication details

The article was received on 26 Apr 2016, accepted on 14 Jul 2016 and first published on 14 Jul 2016


Article type: Paper
DOI: 10.1039/C6TA03475F
J. Mater. Chem. A, 2016,4, 12497-12503

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    Scalable and bendable organized mesoporous TiN films templated by using a dual-functional amphiphilic graft copolymer for solid supercapacitors

    D. J. Kim, J. K. Kim, J. H. Lee, H. H. Cho, Y. Bae and J. H. Kim, J. Mater. Chem. A, 2016, 4, 12497
    DOI: 10.1039/C6TA03475F

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