Enhanced cyclic performance initiated via an in situ transformation of Cu/CuO nanodisk to Cu/CuO/Cu2O nanosponge

Uthirakumar Periyayya, Devendiran Madhu, Kalaiarasan Subramaniyam, Hoki Son, In Hwan Lee

Research output: Contribution to journalArticlepeer-review

Abstract

A simple oxidation method for preparing CuO nanodisks on a flexible Cu sheet is presented. The crystal structure of as-prepared CuO nanodisks was analyzed by X-ray diffraction. The elemental composition and surface morphology were documented by X-ray photoelectron spectroscopy, scanning, and transmission electron microscopy. The photocatalytic performance of flexible Cu/CuO nanodisks was tested to mediate the degradation of RhB and MB dyes. After 2nd recycling, an in situ transformation of the nanodisk surface leads to electron transfer between the conduction bands of Cu2O and CuO phase, accelerating the degradation of the dyes due to a more favorable electron-hole separation under different band gap engineering. The optical and electrochemical impedance analyses were conducted to examine the efficiency of photogenerated charge carrier separation. Additionally, in the photodegradation system of Cu/CuO nanodisks, the generation of superoxide radical (·O2−) is responsible for the dye degradation under daylight irradiation. The generation of the latter radical is energetically feasible since the conduction band of Cu2O (− 0.28 eV) is well-matching with the redox potential of O2/·O2− (− 0.28 eV). Consequently, it is concluded that the cyclic stability shows the usefulness of Cu/CuO nanodisk preparation for the dye degradation under daylight irradiation. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)6459-6469
Number of pages11
JournalEnvironmental Science and Pollution Research
Volume28
Issue number6
DOIs
Publication statusPublished - 2021 Feb

Keywords

  • CuO nanosponges
  • Daylight photocatalyst
  • Flexible Cu/CuO sheet
  • Nanocrystalline materials
  • Recycle test

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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