Correlation of hydrogen generation and optical emission properties of plasma in water photolysis on perovskite photocatalysts

Kyong Hwan Chung, Byung Joo Kim, Sun Jae Kim, Young Kwon Park, Sang Chul Jung

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Photocatalytic decomposition of organic materials-contained aqueous solution is assessed using a plasma discharged into the liquid directly. The correlation of H2 generation and optical emission spectroscopy is discussed in terms of photocatalytic H2 production using plasma and photocatalysts. Variations of the active species are evaluated according to the conditions of the plasma in the liquid phase. The optical emission spectra vary according to the plasma discharging conditions in the liquid phase. The intensities of the OH· peaks at 309 nm increase with the addition of ethanol or acetaldehyde in water. The highest intensities and rate of H2 evolution are observed at a 10% acetaldehyde concentration in the aqueous solution. The rates of H2 evolution in the ethanol or acetaldehyde solution correspond to the concentration of OH· in the solution. The photocatalytic reaction using liquid plasma generates hydrogen at the same time as the decomposition of the organic chemicals. The rate of hydrogen evolution in aqueous solutions containing the organic chemicals is higher than that in pure water. This is because hydrogen is further generated due to hydrogen generation by photolysis of the organic chemicals. CaTiO3 perovskite photocatalyst shows better photocatalytic activity than TiO2. Ni loading on the photocatalyst lead to an increase in H2 production.

Original languageEnglish
Pages (from-to)8595-8604
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number15
DOIs
StatePublished - 18 Mar 2020

Keywords

  • Hydrogen evolution
  • Liquid phase plasma
  • Optical emission
  • Photocatalysts
  • Photocatalytic decomposition

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