Preparation of nickel-bismuth titanates enhanced visible-light photosensitivity and their photocatalytic properties for hydrogen generation by plasma cracking

Kyong Hwan Chung, Su Shiung Lam, Young Kwon Park, Kay Hyeok An, Sang Chul Jung

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Nickel-bismuth titanate was newly synthesized to develop a photocatalyst with better visible-light sensitivity than nickel titanate, which is known among perovskites to have high photocatalytic activity in visible light. Compared to nickel titanate, nickel-bismuth titanate prepared by the solvothermal method combined with the sol-gel method exhibited superior light absorption ability in the UV and visible light regions. The band gap energy of nickel titanate was 2.48 eV, whereas that of nickel-bismuth titanate was lower at 2.41 eV. The photocatalytic activity was evaluated by applying nickel-bismuth titanate to the liquid-phase plasma-cracking process of ammonia water for hydrogen generation. When the liquid plasma was discharged into ammonia water, a strong emission spectrum was observed under both UV and visible light. A strong emission peak related to hydrogen production was observed at 656 nm. The hydrogen production rate from the cracking of ammonia water under liquid plasma radiation was higher for nickel-bismuth-titanate than for nickel titanate. Among the nickel-bismuth titanates, Ni0.9Bi0.1TiO3 showed the highest absorption capacity at 656 nm visible light and the narrowest band gap, indicating an excellent hydrogen production rate.

Original languageEnglish
Article number113239
JournalMolecular Catalysis
Volume545
DOIs
StatePublished - 1 Jul 2023

Keywords

  • Ammonia water
  • H production
  • Liquid-phase plasma
  • Nickel-bismuth titanate
  • Perovskite

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