ZnIn2S4-based multi-interface coupled photocatalyst for efficient photothermal synergistic catalytic hydrogen evolution.

[Display omitted] • Ni-NiO@CNFs/ZnIn 2 S 4 -Vs was prepared by electrospinning and solvothermal methods. • The different photothermal conversion abilities of Ni and CNFs convert NIR into heat energy. • The hydrogen production rate of the best sample (0.9Ni-NiO@CNFs/ZIS-Vs) was as high as 29.16 mmol·g−1·h−1. • Under Vis-NIR conditions, the apparent activation energy (Ea) of 0.9Ni-NiO@CNFs/ZIS-Vs is as low as 9.28 kJ·mol−1. • The photothermal conversion efficiency of the 0.9Ni-NiO@CNFs/ZIS-Vs sample is 61.42%. Photothermal synergistic catalysis is a novel technology that converts energy. In this study, ZnIn 2 S 4 with S-vacancy (ZIS-Vs) is combined with Nickel, Nickle Oxide and Carbon Nanofiber aggregates (Ni-NiO@CNFs) to create a multi-interface coupled photocatalyst with double Schottky barrier, double channel and mixed photothermal conversion effect. Theoretical calculation confirms that the Gibbs free energy (ΔG *H) of the S-scheme heterojunction in the composite material is −0.07 eV, which is close to 0. This promotes the adsorption of H* and accelerates the formation of H 2. Internal photothermal catalysis is achieved by visible-near infrared (Vis-NIR, RT) irradiation. The internal photothermal catalytic hydrogen production rate of the best sample (0.9Ni-NiO@CNFs/ZIS-Vs) is as high as 17.24 mmol·g−1·h−1, and its photothermal conversion efficiency (η) is as high as 61.42 %. Its hydrogen production efficiency is 20.52 times that of ZIS-Vs (0.84 mmol·g−1·h−1) under visible light (Vis, RT) conditions. When the Vis-NIR light source is combined with external heating (75 ℃), the hydrogen production efficiency is further improved, and the hydrogen production efficiency (29.16 mmol·g−1·h−1) is 26.75 times that of ZIS-Vs (1.09 mmol·g−1·h−1, Vis-NIR, RT). Further analysis shows that the increase in hydrogen production resulted from the apparent activation energy (Ea) of the catalyst decreasing from 16.7 kJ·mol−1 to 9.28 kJ·mol−1. This study provides a valuable prototype for the design of an efficient photothermal synergistic catalytic system. [ABSTRACT FROM AUTHOR]