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Ti-rich TiO2 tubular nanolettuces by electrochemical anodization for all-solid-state high-rate supercapacitor devices

Qorbani, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1002/cssc.201901302
  3. Publisher: Wiley-VCH Verlag , 2019
  4. Abstract:
  5. Supercapacitors store charge by ion adsorption or fast redox reactions on the surface of porous materials. One of the bottlenecks in this field is the development of biocompatible and high-rate supercapacitor devices by scalable fabrication processes. Herein, a Ti-rich anatase TiO2 material that addresses the above-mentioned challenges is reported. Tubular nanolettuces were fabricated by a cost-effective and fast anodization process of Ti foil. They attained a large potential window of 2.5 V in a neutral electrolyte owing to the high activation energy for water splitting of the (1 0 1) facet. Aqueous and all-solid-state devices showed diffusion time constants of 46 and 1700 ms, as well as high maximum energy (power) densities of 0.844 (0.858) and 0.338 μWh cm−2 (0.925 mW cm−2), respectively. The all-solid-state device showed ultrahigh stability of 96 % in capacitance retention after 20 000 galvanostatic charge/discharge cycles. These results open an avenue to fabricate biochemically inert supercapacitor devices. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
  6. Keywords:
  7. Anodization ; Supercapacitors ; Activation energy ; Biocompatibility ; Cost effectiveness ; Electrochemistry ; Electrolytes ; Nanostructures ; Nanotubes ; Porous materials ; Redox reactions ; Supercapacitor ; Surface reactions ; Titanium dioxide ; Yarn ; Anodization process ; Anodizations ; Capacitance retention ; Electro-chemical anodization ; Fabrication process ; Galvanostatic charge/discharge ; High activation energy ; Neutral electrolytes ; Solid state devices
  8. Source: ChemSusChem ; Volume 12, Issue 17 , 2019 , Pages 4064-4073 ; 18645631 (ISSN)
  9. URL: https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cssc.201901302