Hydrogenated TiO2 Nanotube Arrays for Supercapacitors

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KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064 United States
*E-mail: (Y.T.) [email protected]; (Y.L.) [email protected]
Cite this: Nano Lett. 2012, 12, 3, 1690–1696
Publication Date (Web):February 24, 2012
Copyright © 2012 American Chemical Society
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We report a new and general strategy for improving the capacitive properties of TiO2 materials for supercapacitors, involving the synthesis of hydrogenated TiO2 nanotube arrays (NTAs). The hydrogenated TiO2 (denoted as H–TiO2) were obtained by calcination of anodized TiO2 NTAs in hydrogen atmosphere in a range of temperatures between 300 to 600 °C. The H–TiO2 NTAs prepared at 400 °C yields the largest specific capacitance of 3.24 mF cm–2 at a scan rate of 100 mV s–1, which is 40 times higher than the capacitance obtained from air-annealed TiO2 NTAs at the same conditions. Importantly, H–TiO2 NTAs also show remarkable rate capability with 68% areal capacitance retained when the scan rate increase from 10 to 1000 mV s–1, as well as outstanding long-term cycling stability with only 3.1% reduction of initial specific capacitance after 10 000 cycles. The prominent electrochemical capacitive properties of H–TiO2 are attributed to the enhanced carrier density and increased density of hydroxyl group on TiO2 surface, as a result of hydrogenation. Furthermore, we demonstrate that H–TiO2 NTAs is a good scaffold to support MnO2 nanoparticles. The capacitor electrodes made by electrochemical deposition of MnO2 nanoparticles on H–TiO2 NTAs achieve a remarkable specific capacitance of 912 F g–1 at a scan rate of 10 mV s–1 (based on the mass of MnO2). The ability to improve the capacitive properties of TiO2 electrode materials should open up new opportunities for high-performance supercapacitors.

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Synthetic and analytical methods, capacitive equations, SEM and TEM images, XPS and XRD spectra, CV and charge/discharge curves, and Mott–Schottky plots. This material is available free of charge via the Internet at http://pubs.acs.org.

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