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

Mohammad Qorbani, Omid Khajehdehi, Amr Sabbah, Naimeh Naseri

Research output: Contribution to journalArticleResearchpeer-review

32 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)4064-4073
Number of pages10
Issue number17
Publication statusPublished - 6 Sept 2019
Externally publishedYes


  • anodization
  • electrochemistry
  • nanostructures
  • nanotubes
  • supercapacitors

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