Issue 24, 2018, Issue in Progress

Photo-assisted synthesis of coaxial-structured polypyrrole/electrochemically hydrogenated TiO2 nanotube arrays as a high performance supercapacitor electrode

Abstract

An organic–inorganic coaxial-structured hybrid of PPy/EH-TNTAs electrode with outstanding supercapacitive performance was developed by incorporating electroactive polypyrrole (PPy) into a highly-conductive TiO2 substrate, namely, electrochemically hydrogenated TiO2 nanotube arrays (EH-TNTAs) through a photo-assisted potentiodynamic electrodeposition route. The as-fabricated PPy/EH-TNTAs hybrid electrode achieves a specific capacitance of up to 614.7 F g−1 at 1.0 A g−1 with 87.4% of the initial capacitance remaining after 5000 cycles at 10 A g−1, outperforming other fabricated PPy-TNTAs hybrid electrodes. The photoelectrodeposited and electrodeposited hybrid samples as well as the EH-TNTAs-based and air–TNTAs-based hybrid samples were fully compared from electropolymerization process, morphology, structural feature and electrochemical perspectives. The results indicate that the synergy of remarkably improved conductivity and electrochemical properties of the TiO2 substrate induced by intentionally introduced Ti3+ (O-vacancies) as well as the homogenous and integrated deposition of PPy triggered by light illumination enabled the outstanding supercapacitive performance of the PPy/EH-TNTAs hybrid electrode. A symmetric supercapacitor device was assembled using the PPy/EH-TNTAs hybrid as both a positive and negative electrode, respectively. It displays a high energy density of 17.7 W h kg−1 at a power density of 1257 W kg−1. This organic–inorganic coaxial-structured PPy/EH-TNTAs electrode will be a competitive and promising candidate for application in future energy storage devices.

Graphical abstract: Photo-assisted synthesis of coaxial-structured polypyrrole/electrochemically hydrogenated TiO2 nanotube arrays as a high performance supercapacitor electrode

Supplementary files

Article information

Article type
Paper
Submitted
08 Dec 2017
Accepted
04 Apr 2018
First published
10 Apr 2018
This article is Open Access
Creative Commons BY license

RSC Adv., 2018,8, 13393-13400

Photo-assisted synthesis of coaxial-structured polypyrrole/electrochemically hydrogenated TiO2 nanotube arrays as a high performance supercapacitor electrode

J. Liu, J. Li, M. Dai, Y. Hu, J. Cui, Y. Wang, H. H. Tan and Y. Wu, RSC Adv., 2018, 8, 13393 DOI: 10.1039/C7RA13166F

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