Topological Luttinger-semimetal CoAs3 dye-sensitized photocatalyst for efficient solar hydrogen evolution

Yuan Cao, Zhuo Han, Rui Song, Yuqi Liu, Shucai Xia, Xinlei Zhang, Jing Leng, Changhao Wang, Wenliang Zhu (), Yin Yu, Xiaomin Tian, Jiaqi He, Yu Zou, Yi Ma (), Jianzhi Gao (), Chuanyao Zhou (), Feng Song (), Wei Huang () and Minghu Pan ()
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Yuan Cao: Shaanxi Normal University
Zhuo Han: Shaanxi Normal University
Rui Song: Science and Technology on Surface Physics and Chemistry Laboratory
Yuqi Liu: Shaanxi Normal University
Shucai Xia: Chinese Academy of Sciences
Xinlei Zhang: Chinese Academy of Sciences
Jing Leng: Chinese Academy of Sciences
Changhao Wang: Shaanxi Normal University
Wenliang Zhu: Shaanxi Normal University
Yin Yu: Tianjin University
Xiaomin Tian: Shaanxi Normal University
Jiaqi He: Shaanxi Normal University
Yu Zou: Shaanxi Normal University
Yi Ma: Shaanxi Normal University
Jianzhi Gao: Shaanxi Normal University
Chuanyao Zhou: Chinese Academy of Sciences
Feng Song: Nankai University
Wei Huang: Nankai University
Minghu Pan: Shaanxi Normal University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Solar-driven photocatalytic water splitting is a process for hydrogen production from a renewable source. The practical implementation of this technology is limited by the low conversion efficiency of the hydrogen evolution reaction under visible light and the insufficient long-term stability of photocatalysts. Here we demonstrate a dye (Eosin Y)-sensitized photocatalyst for efficient hydrogen production. The topological semimetal CoAs3 achieves a hydrogen production rate of 2688 μmol h−1 g−1 (λ ≥ 420 nm) and an apparent quantum efficiency of 15.2% at λ = 500 nm. Efficient photocatalytic activity is attributed to the electronic properties of CoAs3, which facilitate electron transfer at the Eosin Y/CoAs3 interface, determined by transient absorption spectroscopy. Density functional theory calculations predict that CoAs3 is a Luttinger semimetal, exhibiting a quadratic band touching point near the Fermi level and an associated topological insulator gap. The carrier mobility of the material facilitates the transfer of injected electrons from the dye to active sites. Herein, we report a topological photocatalyst that exhibits enhanced stability and efficiency for solar hydrogen production.

Date: 2025
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DOI: 10.1038/s41467-025-63843-y

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