Engaging the flux-grown La1−xSrxFe1−yTiyO3 crystals in visible-light-driven photocatalytic hydrogen generation

Mirabbos Hojamberdiev, Kenta Kawashima, Mahesh Kumar, Akira Yamakata, Kunio Yubuta, Aleksander Gurlo, Masashi Hasegawa, Kazunari Domen, Katsuya Teshima

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)

抄録

Perovskite LaFeO3 is regarded as one of the promising photocatalysts for solar splitting of water to hydrogen and oxygen due to its suitable band edge positions, visible light absorbance, and high chemical stability. To further improve its photocatalytic performance of LaFeO3, the effects of solute concentration in the KCl-flux growth and partial A– and B–site substitution are investigated in this work. Controlling the solute concentration in the range of 1–20 mol% is crucial to grow phase-pure LaFeO3 crystals with idiomorphic shape. With increasing the solute concentration, the flux-based growth route gradually changes to a solid state-based growth route because of a decrease in solubility and an increase in the crystallization core number. The La1−xSrxFe1−yTiyO3 (x,y = 0,0; 0,0.15; 0.15,0; 0.1125,0.0375; 0.0375,0.1125; and 0.075,0.075) crystals were also synthesized by a KCl-flux method to explore the effect of partial Sr2+-to-La3+ and/or Ti4+-to-Fe2−4+ substitution on photocatalytic performance of LaFeO3. The Sr2+–Ti4+ co-substitution is found to enhance the photocatalytic performance of LaFeO3 as compared with the corresponding individual substitution (Sr2+ or Ti4+). The highest photocatalytic hydrogen generation rate (83.2 μmol h−1) was observed for Pt-photodeposited La0.925Sr0.075Fe0.925Ti0.075O3 crystals in 5-h reaction due to the improvement of both bulk properties and photoactivity and the reduction in both grain boundaries and lattice defects stemmed from the Sr2+–Ti4+ co-substitution and KCl flux growth.

本文言語英語
ページ(範囲)27024-27033
ページ数10
ジャーナルInternational Journal of Hydrogen Energy
42
44
DOI
出版ステータス出版済み - 11 2 2017
外部発表はい

All Science Journal Classification (ASJC) codes

  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 凝縮系物理学
  • エネルギー工学および電力技術

フィンガープリント

「Engaging the flux-grown La<sub>1−x</sub>Sr<sub>x</sub>Fe<sub>1−y</sub>Ti<sub>y</sub>O<sub>3</sub> crystals in visible-light-driven photocatalytic hydrogen generation」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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