Co-doping of a La5Ti2Cu0.9Ag0.1O7S5 photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H2 evolution

Xiaojun Wang; Zhenhua Pan; Junie Jhon M. Vequizo; Takashi Hisatomi; Swarnava Nandy; Tomohiro Higashi; Lihua Lin; Jiadong Xiao; Tsuyoshi Takata; Akira Yamakata; Wei Yan; Kazunari Domen

doi:10.1039/D3CC01863F

Co-doping of a La₅Ti₂Cu_0.9Ag_0.1O₇S₅ photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H₂ evolution†

Xiaojun Wang,^ab Zhenhua Pan,

^a Junie Jhon M. Vequizo,^a Takashi Hisatomi,

^a Swarnava Nandy,^a Tomohiro Higashi,

^c Lihua Lin,^a Jiadong Xiao,

^a Tsuyoshi Takata,^a Akira Yamakata,

^d Wei Yan

*^b and Kazunari Domen

*^ae

Author affiliations

* Corresponding authors

^a Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano-Shi, Nagano 380-8553, Japan

^b Department of Environmental Science & Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
E-mail: yanwei@xjtu.edu.cn

^c Institute for Tenure Track Promotion, University of Miyazaki, Nishi 1-1 Gakuen-Kibanadai, Miyazaki 889-2192, Japan

^d Faculty of Natural Science and Technology, Okayama University, Kita-ku, Okayama, Japan

^e Office of University Professors, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: domen@chemsys.t.u-tokyo.ac.jp

Abstract

La₅Ti₂Cu_0.9Ag_0.1O₇S₅ (LTCA) (λ < 700 nm) can function as a photocatalyst for H₂ evolution. Co-doping LTCA with Ga³⁺ and Al³⁺ at Ti⁴⁺ sites effectively enhanced the H₂ evolution activity of LTCA, yielding an apparent quantum efficiency of 18% at 420 nm. The activity of this material was greater than that previously reported for Ga-doped LTCA by a factor of 1.6. Such activity enhancement is attributed to increasing the population of long-lived photogenerated electrons and facilitating the electron transfer to the cocatalyst. This work significantly improved the LTCA-based photocatalyst for H₂ evolution, making it a promising material for future application in non-sacrificial Z-scheme water splitting.

Chemical Communications

Co-doping of a La₅Ti₂Cu_0.9Ag_0.1O₇S₅ photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H₂ evolution†

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Co-doping of a La₅Ti₂Cu_0.9Ag_0.1O₇S₅ photocatalyst (λ < 700 nm) with Ga and Al to enhance photocatalytic H₂ evolution

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