Core–shell-structured LaTaON2 transformed from LaKNaTaO5 Plates for enhanced photocatalytic H2 evolution

Xin Wang, Takashi Hisatomi, Zheng Wang, Jun Song, Junle Qu, Tsuyoshi Takata, Kazunari Domen

Research output: Contribution to journalArticleResearchpeer-review

27 Citations (Scopus)

Abstract

LaTaON2 is a photocatalyst with intense visible light absorption up to 650 nm, but exhibits low H2 evolution activity owing to uncontrolled facets and high defect densities. In this work, core–shell-structured plate-like LaKNaTaO5/LaTaON2 was synthesized by nitriding a layered perovskite-type LaKNaTaO5. The volatilization of K and Na species during the nitridation promoted the rapid transformation of LaKNaTaO5 into LaTaON2 along [010] direction with the plate-like shape retained. This yielded high-quality LaTaON2 shells exposing (010) facets on the lattice-matched LaKNaTaO5 cores. After loading with a Rh co-catalyst, LaKNaTaO5/LaTaON2 showed photocatalytic H2 evolution activity four times greater than that obtained from conventional irregular-shaped LaTaON2 powders and utilized visible light up to 620 nm. This work provides a novel strategy yielding oxynitrides with well-defined facets and low defect densities by selecting lattice-matched oxide precursors containing volatile components.

Original languageEnglish
Pages (from-to)10666-10670
Number of pages5
JournalAngewandte Chemie - International Edition
Volume58
Issue number31
DOIs
Publication statusPublished - 29 Jul 2019
Externally publishedYes

Keywords

  • core–shell structures
  • LaKNaTaO
  • LaTaON
  • layered perovskites
  • photocatalytic H evolution

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