Transient Behavior of Ni@NiOx Functionalized SrTiO3 in Overall Water Splitting

Kai Han, Tomas Kreuger, Bastian Mei, Guido Mul*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

38 Citations (Scopus)
58 Downloads (Pure)

Abstract

Transients in the composition of Ni@NiOx core-shell co-catalysts deposited on SrTiO3 are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H2:O2 ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)2 to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)2 with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated. (Chemical Equation Presented).

Original languageEnglish
Pages (from-to)1610-1614
Number of pages5
JournalACS catalysis
Volume7
Issue number3
DOIs
Publication statusPublished - 3 Mar 2017

Keywords

  • Ni@NiO co-catalysts
  • regeneration
  • solar water splitting
  • SrTiO
  • transient behavior

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