Fe/Ru Oxide as a Versatile and Effective Cocatalyst for Boosting Z-Scheme Water-Splitting: Suppressing Undesirable Backward Electron Transfer

Akinobu Nakada, Hajime Suzuki, Junie Jhon M. Vequizo, Kanta Ogawa, Masanobu Higashi, Akinori Saeki, Akira Yamakata, Hiroshi Kageyama, Ryu Abe

研究成果査読

12 被引用数 (Scopus)

抄録

The atificial Z-scheme is a promising and rational strategy for solar-to-chemical energy conversion such as water-splitting. In the Z-scheme, backward redox processes are an essential drawback that should be overcome to increase its efficiency. Here, we demonstrate that the simple co-loading of Fe/Ru oxide, (Fe,Ru)Ox, onto various photocatalysts effectively improves the efficiency of water oxidation by suppressing the undesirable backward oxidation of the redox reagent Fe2+. The (Fe,Ru)Ox co-loading on Bi4TaO8Cl afforded the highest water-splitting activity (apparent quantum efficiency of 1.6% at 420 nm) among the Z-scheme systems employing mixed-anion compounds as O2-evolving photocatalysts. The results of photoelectrochemical and electrochemical measurements along with time-resolved spectroscopy clarified the key roles of Fe/Ru oxide; the Ru oxide component functions as a "collector" of photogenerated carriers and active sites for surface redox reactions, while the Fe oxide component acts as a "blocker" against unfavorable Fe2+ oxidation. The versatile availability of Fe/Ru oxide has been demonstrated for other visible-light-responsive photocatalysts.

本文言語English
ページ(範囲)45606-45611
ページ数6
ジャーナルACS Applied Materials and Interfaces
11
49
DOI
出版ステータスPublished - 12月 11 2019
外部発表はい

ASJC Scopus subject areas

  • 材料科学一般

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