Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime

Hiroshi Sugimoto, Bálint Somogyi, Toshiyuki Nakamura, Hao Zhou, Yuichi Ichihashi, Satoru Nishiyama, A. Gali, Minoru Fujii

Research output: Contribution to journalArticle

Abstract

Cubic boron phosphide (BP) is an indirect band gap semiconductor with a band gap of 2.0 eV and promising for a highly stable photocatalyst to produce hydrogen from water under visible light irradiation. Here, we performed a comprehensive study on the energy-level structure and photocatalytic activity of BP nanocrystals (NCs) in the quantum confinement regime (<5 nm in diameter). First, we calculated the electronic structure of cubic BP NCs up to 2.8 nm in diameter, hexagonal BP nanoflakes, and cubic/hexagonal BP nanostructures by density functional theory and time-dependent density functional theory. We then synthesized BP NCs with 2-13 nm in diameters and performed detailed structural analyses and optical measurements. The photocatalytic bleaching experiments for dye molecules under visible light irradiation revealed that the bleaching rate depends strongly on the size of BP NCs; the increase in the band gap of BP NCs by the quantum size effects (QSE) enhanced the photocatalytic activity. The band gap increase by the QSE also enhanced the rate of photocatalytic hydrogen evolution in water.

Original languageEnglish
Pages (from-to)23226-23235
Number of pages10
JournalJournal of Physical Chemistry C
Volume123
Issue number37
DOIs
Publication statusPublished - Sep 19 2019

Fingerprint

boron phosphides
Quantum confinement
Boron
Nanocrystals
nanocrystals
Energy gap
bleaching
Bleaching
Density functional theory
Hydrogen
Irradiation
density functional theory
irradiation
Water
hydrogen
Photocatalysts
optical measurement
Electron energy levels
water
Electronic structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Sugimoto, H., Somogyi, B., Nakamura, T., Zhou, H., Ichihashi, Y., Nishiyama, S., ... Fujii, M. (2019). Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime. Journal of Physical Chemistry C, 123(37), 23226-23235. https://doi.org/10.1021/acs.jpcc.9b06487

Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime. / Sugimoto, Hiroshi; Somogyi, Bálint; Nakamura, Toshiyuki; Zhou, Hao; Ichihashi, Yuichi; Nishiyama, Satoru; Gali, A.; Fujii, Minoru.

In: Journal of Physical Chemistry C, Vol. 123, No. 37, 19.09.2019, p. 23226-23235.

Research output: Contribution to journalArticle

Sugimoto, H, Somogyi, B, Nakamura, T, Zhou, H, Ichihashi, Y, Nishiyama, S, Gali, A & Fujii, M 2019, 'Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime', Journal of Physical Chemistry C, vol. 123, no. 37, pp. 23226-23235. https://doi.org/10.1021/acs.jpcc.9b06487
Sugimoto, Hiroshi ; Somogyi, Bálint ; Nakamura, Toshiyuki ; Zhou, Hao ; Ichihashi, Yuichi ; Nishiyama, Satoru ; Gali, A. ; Fujii, Minoru. / Size-dependent photocatalytic activity of cubic boron phosphide nanocrystals in the quantum confinement regime. In: Journal of Physical Chemistry C. 2019 ; Vol. 123, No. 37. pp. 23226-23235.
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