Synthesis and photocatalytic activity of rhodium-doped calcium niobate nanosheets for hydrogen production from a water/methanol system without cocatalyst loading

Yohei Okamoto, Shintaro Ida, Junji Hyodo, Hidehisa Hagiwara, Tatsumi Ishihara

Research output: Contribution to journalArticle

133 Citations (Scopus)

Abstract

Rhodium-doped calcium niobate nanosheets were synthesized by exfoliating layered KCa 2Nb 3-xRh xO 10-δ and exhibited high photocatalytic activity for H 2 production from a water/methanol system without cocatalyst loading. The maximum H 2 production rate of the nanosheets was 165 times larger than that of the parent Rh-doped layered oxide. The quantum efficiency at 300 nm was 65%. In this system, the methanol was oxidized to formaldehyde (main product), formic acid, and carbon dioxide by holes, whereas electrons cause the reduction of water to H 2. The conductivity of the parent layered oxide was decreased by doping, which indicates the octahedral RhO 6 unit in the lattice of the nanosheet functions as an electron trap site. The RhO 6 units in the nanosheet probably also act as reaction sites for H 2 evolution.

Original languageEnglish
Pages (from-to)18034-18037
Number of pages4
JournalJournal of the American Chemical Society
Volume133
Issue number45
DOIs
Publication statusPublished - Nov 16 2011

Fingerprint

Rhodium
formic acid
Nanosheets
Hydrogen production
Oxides
Methanol
Hydrogen
Calcium
Electrons
Water
Carbon Dioxide
Formaldehyde
Electron traps
Formic acid
Quantum efficiency
Crystal lattices
Carbon dioxide
Doping (additives)

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Synthesis and photocatalytic activity of rhodium-doped calcium niobate nanosheets for hydrogen production from a water/methanol system without cocatalyst loading. / Okamoto, Yohei; Ida, Shintaro; Hyodo, Junji; Hagiwara, Hidehisa; Ishihara, Tatsumi.

In: Journal of the American Chemical Society, Vol. 133, No. 45, 16.11.2011, p. 18034-18037.

Research output: Contribution to journalArticle

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