Tunable Synthesis of Colorful Nitrogen-Doped Titanium Oxide and Its Application in Energy Storage

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State Key Laboratory of Rare Earth Materials Chemistry and Applications and National Laboratory, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
School of Science, China University of Geosciences, Beijing 100083, People’s Republic of China
§ State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
*(T.L.) E-mail: [email protected]
*(F.H.) E-mail: [email protected]
Cite this: ACS Appl. Energy Mater. 2018, 1, 2, 876–882
Publication Date (Web):February 7, 2018
https://doi.org/10.1021/acsaem.7b00308
Copyright © 2018 American Chemical Society
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Abstract

The one-pot synthesis of titania with diverse degrees of oxygen vacancies and nitrogen dopants through arc-discharge and nitridation process is first reported. The series of TiO2–x:N samples are prepared by tuning the ratio of CO2/H2 in the chamber. The chemical composition, microstructure, and valence state of TiO2–x:N are characterized by a variety of measurements. Specifically, the as-prepared samples achieve the highest specific capacitance (210 F g–1 at 2 mV s–1), which is much higher than that of TiO2–x and commercial P25. Moreover, it exhibits good cycling stability with 9% attenuation of capacitance after 10,000 cycles. The capacitive enhancement can be attributed to more active pseudocapacitive properties and improved electrical conductivity due to oxygen vacancies and nitrogen dopants. This work provides another feasible path to simplify the tunable synthesis of titania with different oxygen defects, and further optimize the degree of nitrogen dopants in order to realize better performance in the future.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsaem.7b00308.

  • Synthesis conditions of TiO2 and nitrogen-doped TiO2 samples; XRD patterns; SAED images; XPS spectra; CV curves; electrical conductivities (PDF)

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