Eliciting the contribution of TiN to photoelectrochemical performance enhancement of Imma-LaTiO2N at neutral pH

Mirabbos Hojamberdiev, Juan Manuel Mora-Hernandez, Ronald Vargas, Eva Maria Heppke, Kunio Yubuta, Akira Yamakata, Zukhra Kadirova, Leticia Torres-Martínez, Katsuya Teshima, Martin Lerch


2 被引用数 (Scopus)


The presence of defects, which act as the recombination hubs for photogenerated charge carriers, hinders the improvement of photocatalytic activity for oxygen evolution reaction of LaTiO2N under visible light irradiation via a four-electron-transfer reaction pathway. Here, we involve titanium nitride (TiN) in a varying content (0–17.8%) to improve the efficiency of charge separation and transport, influencing the photoelectrochemical performance of LaTiO2N. The characterization results confirm the formation of a strong contact between orthorhombic-LaTiO2N and cubic-TiN particles. The photoelectrochemical (PEC) measurements reveal the inverse dependence between electron transfer phenomena and charge carrier recombination, which allows to understand the trend when modifying LaTiO2N with TiN. In fact, the incorporation of 17.8% TiN in the LaTiO2N:TiN material results in a higher photocurrent. Open-circuit potential (OCP) decay and transient absorption spectroscopy (TAS) studies confirm longer lifetimes of charge carriers for increasing amounts of TiN in the synthesized materials. Thus, the main role of TiN is to improve the properties of the semiconductor-electrolyte interface, having verified its impact on the separation and transport of photogenerated charge carriers. Furthermore, computational studies predict that the adsorption of water molecules is favored at the LaTiO2N:TiN surface compared to the individual TiN and LaTiO2N surfaces.

ジャーナルMaterials Today Energy
出版ステータスPublished - 7月 2022

ASJC Scopus subject areas

  • 再生可能エネルギー、持続可能性、環境
  • 材料科学(その他)
  • 原子力エネルギーおよび原子力工学
  • 燃料技術
  • エネルギー工学および電力技術


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