Specific surface area and three-dimensional nanostructure measurements of porous titania photocatalysts by electron tomography and their relation to photocatalytic activity

Kenta Yoshida, Masaki Makihara, Nobuo Tanaka, Shinobu Aoyagi, Eiji Nishibori, Makoto Sakata, Edward D. Boyes, Pratibha L. Gai

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Various porous titania photocatalysts are analyzed three-dimensionally in real space by electron tomography. Shapes and three-dimensional (3D) distributions of fine pores and silver (Ag) particles (2 nm in diameter) within the pores are successfully reconstructed from the 3D data. Electron tomography is applied for measuring the specific surface area of the porous structures including open and closed porosity. Calculated specific surface areas of 22.8 m2/g for a conventional sol-gel TiO2 sample and 366 m2/g for a highly porous TiO2 sample prepared using the Pluronic P-123 self-assembly process are compared with those measured by the general BET method. The real-space surface measurement indicates that the highly porous TiO2 produced by the present method using block copolymers has a greater number of effective reaction sites for the degradation of methylene blue. Electron tomography shows a great potential to contribute considerably to the nanostructural analysis and design of such catalyst materials for photocatalysis.

Original languageEnglish
Pages (from-to)264-273
Number of pages10
JournalMicroscopy and Microanalysis
Volume17
Issue number2
DOIs
Publication statusPublished - 2011 Apr 1
Externally publishedYes

Keywords

  • TiO
  • electron tomography
  • heterogeneity
  • nanocatalysis
  • photocatalyst
  • porous material

ASJC Scopus subject areas

  • Instrumentation

Fingerprint Dive into the research topics of 'Specific surface area and three-dimensional nanostructure measurements of porous titania photocatalysts by electron tomography and their relation to photocatalytic activity'. Together they form a unique fingerprint.

Cite this