Activation of Water-Splitting Photocatalysts by Loading with Ultrafine Rh–Cr Mixed-Oxide Cocatalyst Nanoparticles

Wataru Kurashige, Yutaro Mori, Shuhei Ozaki, Masanobu Kawachi, Sakiat Hossain, Tokuhisa Kawawaki, Cameron J. Shearer, Akihide Iwase, Gregory F. Metha, Seiji Yamazoe, Akihiko Kudo, Yuichi Negishi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The activity of many water-splitting photocatalysts could be improved by the use of RhIII–CrIII mixed oxide (Rh2−xCrxO3) particles as cocatalysts. Although further improvement of water-splitting activity could be achieved if the size of the Rh2−xCrxO3 particles was decreased further, it is difficult to load ultrafine (<2 nm) Rh2−xCrxO3 particles onto a photocatalyst by using conventional loading methods. In this study, a new loading method was successfully established and was used to load Rh2−xCrxO3 particles with a size of approximately 1.3 nm and a narrow size distribution onto a BaLa4Ti4O15 photocatalyst. The obtained photocatalyst exhibited an apparent quantum yield of 16 %, which is the highest achieved for BaLa4Ti4O15 to date. Thus, the developed loading technique of Rh2−xCrxO3 particles is extremely effective at improving the activity of the water-splitting photocatalyst BaLa4Ti4O15. This method is expected to be extended to other advanced water-splitting photocatalysts to achieve higher quantum yields.

Original languageEnglish
Pages (from-to)7076-7082
Number of pages7
JournalAngewandte Chemie - International Edition
Issue number18
Publication statusPublished - 27 Apr 2020


  • cocatalysts
  • metal clusters
  • nanostructures
  • photocatalysts
  • water splitting

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