Enhanced photo-piezo-catalytic properties of Co-doped Ba0.85Ca0.15Zr0.1(Ti1-xCox)0.9 ferroelectric ceramics for dye degradation

Yan Zhao, Qianqian Xu, Xuefan Zhou, Mingyang Yan, Hanyu Gong, Xi Yuan, Hang Luo, Kechao Zhou, Dou Zhang, Chris Bowen, Yan Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

This paper provides a detailed evaluation of the photo-piezo-catalytic properties of lead-free Ba0.85Ca0.15Zr0.1(Ti1-xCox)0.9(BCZT-xCo,x = 0–0.025) ferroelectric ceramics prepared by a solid-state process. By control of the Co doping level, the band gap was reduced to 2.40 eV at the composition x = 0.02, which improved the generation of photo-generated charges and enhanced the photocatalytic activity. When a solution containing BCZT-0.02Co particles was subjected to both ultrasound and illumination, the degree of degradation of Rhodamine B reached 99% within 60 min, which was grater than when subjected to illumination or ultrasound alone. Examination of the dielectric properties, photoelectrochemical measurements and band energy structure of the materials provided new insights into the catalytic mechanism, where a strong coupling between piezoelectricity and photoexcitation was clearly observed. This work therefore highlights the attractive photo-piezo-catalytic properties of BCZT-xCo doped ceramics and is the first demonstration that Co substitution in these lead-free ferroelectric ceramics provides significant potential for photo-piezo-catalysis applications.

Original languageEnglish
JournalCeramics International
Early online date4 Nov 2022
DOIs
Publication statusE-pub ahead of print - 4 Nov 2022

Keywords

  • Band gap decreasing
  • Barium calcium zirconate titanate ceramics
  • Doping modification
  • Photo-piezo-catalysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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