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Perovskite oxynitride solid solutions of LaTaON2-CaTaO2N with greatly enhanced photogenerated charge separation for solar-driven overall water splitting

Research output: Contribution to journalArticlepeer-review

Author(s)

Yawei Wang, Yuyang Kang, Huaze Zhu, Gang Liu, John T. S. Irvine, Xiaoxiang Xu

School/Research organisations

Abstract

The search for solar‐driven photocatalysts for overall water splitting has been actively pursued. Although metal oxynitrides with metal d0/d10‐closed shell configuration are very promising candidates in terms of their visible light absorption, they usually suffer from serious photo‐generated charge recombination and thus, little photoactivity. Here, by forming their solid solutions of LaTaON2 and CaTaO2N, which are traditionally considered to be inorganic yellow‐red pigments but have poor photocatalytic activity, a class of promising solar‐driven photocatalysts La1‐xCaxTaO1+yN2‐y (0 ≤ x, y ≤ 1) are explored. In particular, the optimal photocatalyst with x = 0.9 has the ability of realizing overall water splitting with stoichiometric H2/O2 ratio under the illumination of both AM1.5 simulated solar light and visible light. The modulated key parameters including band structure, Ta bonding environment, defects concentration, and band edge alignments revealed in La0.1Ca0.9TaO1+yN2‐y have substantially promoted the separation of photogenerated charge carriers with sufficient energetics for water oxidation and reduction reactions. The results obtained in this study provide an important candidate for designing efficient solar‐driven photocatalysts for overall water splitting.
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Details

Original languageEnglish
Article number2003343
Number of pages8
JournalAdvanced Science
VolumeEarly View
Early online date25 Nov 2020
DOIs
Publication statusE-pub ahead of print - 25 Nov 2020

    Research areas

  • Oxynitrides, Perovskites, Solid solution, Visible light, Water splitting

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