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. 2019 May 17;11(5):899. doi: 10.3390/polym11050899

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The specific capacitance (A) and electrochemical impedance spectroscopy (EIS) test (B) of different electrodes. Inset A and B represent the stability of the TiO₂-carbon NF composite and semicircle area in the EIS spectra, respectively.