Effect of cobalt doping on photocatalytic water splitting activity of NiTi-layered double hydroxide


Samuei S., Akbari S. S. , ÜLKER E. , KARADAŞ F.

CATALYSIS SCIENCE & TECHNOLOGY, 2022 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Publication Date: 2022
  • Doi Number: 10.1039/d2cy00148a
  • Title of Journal : CATALYSIS SCIENCE & TECHNOLOGY

Abstract

Metal doping has been used as an effective strategy to tune the energy levels of semiconductors. Herein, we dope NiTi layered double hydroxide (NiTi-LDH) with cobalt to prepare a ternary LDH, CoNiTi-LDH, to enhance its photocatalytic performance towards both water oxidation and hydrogen evolution. A CoNiTi-LDH with smaller plate sizes and a higher degree of order is obtained, which allows the band gap to shrink from 2.7 eV to 2.4 eV. CoNiTi-LDH exhibits a photocatalytic water oxidation activity of 366 mu mol g(-1) h(-1), which is more than two times higher than NiTi-LDH (166 mu mol g(-1) h(-1)). We observed that appropriate energy levels of CoNiTi-LDH allow it to be an efficient photocatalyst also for hydrogen evolution. We performed detailed characterization studies to elucidate the effect of Co-doping on photocatalytic activity.