Effect of cobalt doping on photocatalytic water splitting activity of NiTi-layered double hydroxide. Issue 9 (1st April 2022)

• Record Type: Journal Article
• Authors: Samuei, Sara; Sadigh Akbari, Sina; Ülker, Emine; Karadas, Ferdi
• Is Part Of: Catalysis science & technology. Volume 12:Issue 9(2022)
• Page Start: 3044
• Page End: 3053
• Publication Date: 2022-04-01
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/d2cy00148a
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Cobalt-doping a NiTi layered double hydroxide affords CoNiTi-LDH with smaller plate sizes and a higher degree of order, which allows the band gap to shrink from 2.7 eV to 2.4 eV. CoNiTi-LDH is active for both water oxidation and reduction. 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 μmol g −1 h −1, which is more than two times higher than NiTi-LDH (166 μmol 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.