Solar Water Oxidation by a Visible-Light-Responsive Tantalum/Nitrogen-Codoped Rutile Titania Anode for Photoelectrochemical Water Splitting and Carbon Dioxide Fixation

Akinobu Nakada, Tomoki Uchiyama, Nozomi Kawakami, Go Sahara, Shunta Nishioka, Ryutaro Kamata, Hiromu Kumagai, Osamu Ishitani, Yoshiharu Uchimoto, Kazuhiko Maeda

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Non-oxide materials such as oxynitrides are good candidates as photoanodes for visible-light-driven water oxidation, but most of them suffer from oxidative degradation by photogenerated holes, resulting in low stability. Herein we developed a photoanode using a visible-light-responsive TiO2 powder doped with tantalum and nitrogen (TiO2:Ta/N) for water oxidation. The Ta/N codoping enabled a stable anodic photocurrent response attributable to water oxidation under visible-light irradiation. Surface modification of the TiO2:Ta/N anode with RuOx species further facilitated water oxidation catalysis, achieving stable O2 evolution over 5 h of operation with no sign of deactivation. Operando XAFS measurements revealed an important function of the RuOx species as a collector of photogenerated holes in TiO2:Ta/N, facilitating the photoelectrochemical water oxidation. Visible-light-driven H2 evolution and solar-driven CO2 reduction into CO were both achieved by using water as an electron donor in photoelectrochemical cells with the TiO2:Ta/N photoanode coupled to a Pt cathode and a Ru(II)–Re(I) binuclear complex photocathode, respectively.

Original languageEnglish
Pages (from-to)37-45
Number of pages9
JournalChemPhotoChem
Volume3
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • artificial photosynthesis
  • carbon dioxide reduction
  • doped TiO
  • photoelectrochemistry
  • water splitting

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Analytical Chemistry

Fingerprint Dive into the research topics of 'Solar Water Oxidation by a Visible-Light-Responsive Tantalum/Nitrogen-Codoped Rutile Titania Anode for Photoelectrochemical Water Splitting and Carbon Dioxide Fixation'. Together they form a unique fingerprint.

  • Cite this