Fabrication of optical gap selective amorphous carbon photocatalyst for hydrogen production under irradiation with visible light

Keigo Okafuji, Ryutaro Kobayashi, Shinpei Ohtomo, Hiroshi Naragino, Kensuke Honda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Si-added amorphous carbon (a-C) nanoparticles with particle diameter of 12.6 nm were synthesized using radio frequency (r.f.) plasma-enhanced chemical vapor deposition method equipped with porous aluminum plate in plasma. The optical gap of Si-added a-C particles with Si/(Si + C) ratio of 0.51 was 1.92 eV. Band edges of this nanoparticles was estimated to be as follows: i) conduction band edge was located over the standard potential of H+/H2 and ii) valence band edge was located under the standard potential of O2/H2O. From X-ray photoemission spectra, it was clarified that the part of tri-s-triazine structure with higher adsorption property toward water was introduced into nanoparticle with optical gap of 1.92 eV by adding graphitic-carbon nitride (g-C3N4) in a source material. The photo-oxidation measurement of indigo carmine adsorbed on Si-added a-C nanoparticles with tri-s-triazine structure was carried out. As a result, indigo carmine was decomposed at a rate of 0.0197 μmol/h. under UV irradiation. This result indicates that Si-added a-C nanoparticle can be applied to photocatalyst for reduction of water (estimated quantum efficiency of 0.049 %). It was experimentally demonstrated that the proposed Si-added a-C nanoparticles are tailor-made photocatalyst material that enables us to adjust band edge and surface functionalities for photo-oxidation (reduction) reactant.

Original languageEnglish
Title of host publicationPhotocatalysts, Photoelectrochemical Cells, and Solar Fuels 7
EditorsH. Wang, M. P. Soriaga, N. Batina, D. Chu, V. R. Subramanian, B. Ohtani, P. J. Kulesza, K. T. Nam, H. Park, J.-J. Lee, N. Wu, T. Tatsuma, A. Kudo
PublisherElectrochemical Society Inc.
Pages57-74
Number of pages18
Edition50
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2017
Externally publishedYes
EventSymposium on Photocatalysts, Photoelectrochemical Cells, and Solar Fuels 7 - PRiME 2016/230th ECS Meeting - Honolulu, United States
Duration: Oct 2 2016Oct 7 2016

Publication series

NameECS Transactions
Number50
Volume75
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferenceSymposium on Photocatalysts, Photoelectrochemical Cells, and Solar Fuels 7 - PRiME 2016/230th ECS Meeting
CountryUnited States
CityHonolulu
Period10/2/1610/7/16

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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