Single-Crystalline LaTiO2N Nanosheets with Regulated Defects for Photocatalytic Overall Water Splitting under Visible Light up to 600 nm

Jinxing Yu, Li Shi, Ronghua Li, Jie Huang, Ran Wang, LI Zhuo, Cai Shen, Gang Liu, Yanbo Li, Xiaoxiang Xu

Research output: Journal PublicationArticlepeer-review

Abstract

Overall water splitting (OWS), liberating H2 and O2 in a 2:1 ratio, based on powdery photocatalysts, represents a simple and cost-effective means for solar hydrogen production. For an efficient solar energy harvest, the use of OWS reactions should be operated using narrow-band gap semiconductors, which remains a great challenge. In this work, photocatalytic OWS reactions, operable up to 600 nm, have been achieved over a narrow-band gap semiconductor LaTiO2N with single-crystalline nanosheet morphology. These nanosheets, prepared via a topotactic route, are of a low concentration of Ti3+ defects whose locations are limited to the top surface of ∼1 nm thickness. Such a regulated Ti3+ distribution is essential for OWS reactions as it enables the accumulation of both photogenerated electrons and holes at the surface region simultaneously. Compared with conventional inactive LaTiO2N, LaTiO2N single-crystalline nanosheets can stably photocatalyze OWS reactions under visible light and simulated AM1.5G after being deposited with the RhCrOy cocatalyst and coated with a Ti oxyhydroxide layer. These findings provide a rational guideline to open up the OWS activity of narrow-band gap semiconductors by proper defect regulation.
Original languageEnglish
Pages (from-to)608-618
JournalACS Catalysis
DOIs
Publication statusPublished Online - 27 Dec 2023

Keywords

  • defect
  • photocatalyst
  • overall water splitting
  • LaTiO2N
  • nanosheet
  • single-crystal

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