Acta Phys. -Chim. Sin. ›› 2025, Vol. 41 ›› Issue (11): 100145.doi: 10.1016/j.actphy.2025.100145

• ARTICLE • Previous Articles     Next Articles

W18O49/Al-doped SrTiO3 S-scheme heterojunction aided by the LSPR effect for full-spectrum solar light-driven photocatalytic hydrogen evolution

Jinhui Jiang1, Jiaqi Sun1, Yongyi Chen1,2, Lei Zhang1,2, Pengyu Dong1,*()   

  1. 1 Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, China
    2 Key Laboratory for Ecological-Environment Materials of Jiangsu Province, School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu Province, China
  • Received:2025-06-20 Revised:2025-07-30 Accepted:2025-07-31 Published:2025-09-29
  • Contact: Email: dongpy11@gmail.com (Pengyu Dong)
  • Supported by:
    the National Natural Science Foundation of China(21403184); the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(22KJA430008)

Abstract:

Developing highly efficient photocatalysts with a full-spectrum response for hydrogen production is of great significance. To achieve full-spectrum solar-light-driven photocatalysis, W18O49 works well for capturing visible and near-infrared (NIR) light due to the localized surface plasmon resonances (LSPR) effect. Nevertheless, W18O49 has very little photocatalytic hydrogen generation activity, which needs to be modified. In this work, a simple in situ solvothermal synthesis method was conducted to prepare Al-doped SrTiO3 (ASTO)/W18O49 S-scheme heterojunction. Benefiting from more powerful carrier separation, faster electron transport, and strong redox capacity, the 10% ASTO/W18O49 S-scheme heterojunction exhibits the highest full-spectrum solar-light-driven photocatalytic hydrogen rate, which is 17.5 and 27.6 times that of pure ASTO and W18O49, respectively. The LSPR effect derived from W18O49 with abundant oxygen vacancies extends the range of light absorption to the NIR region, which significantly improves its utilization efficiency of full-spectrum sunlight. Moreover, due to the LSPR effect of W18O49, it could produce plasmonic high-energy "hot electrons" and allow them to transfer to the conduction band (CB) of ASTO in the ASTO/W18O49 heterojunction, which could promote the separation and migration of photoinduced carriers and greatly increase the number of electrons containing photogenerated electrons and "hot electrons" on the CB of ASTO that can participate in photocatalytic hydrogen production reaction, exhibiting excellent photocatalytic hydrogen evolution performance compared to single-component W18O49 and ASTO.

Key words: S-scheme heterojunction, Photocatalytic hydrogen evolution, LSPR effect, W18O49, Al-doped SrTiO3