Synergetic effect of the interface electric field and the plasmon electromagnetic field in Au-Ag alloy mediated Z-type heterostructure for photocatalytic hydrogen production and CO2 reduction

• Published in: Applied catalysis. B, Environmental Environmental, 2023-08, Vol.331, p.122700, Article 122700
• Main Authors: Li, Qi, Yang, Shengchao, Liu, Ruihan, Huang, Yufan, Liang, Yuwei, Hu, Chunling, Wang, Min, Liu, Zhiyong, Tai, Yanlong, Liu, Jichang, Li, Yongsheng
• Format: Article
• Language: English
• Subjects: Au-Ag alloy; Dual electric field; Heterostructure; Localized surface plasmon resonance; Photocatalysis
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2023.122700

The challenge of synergistically optimizing different mechanisms limits the further improvement of plasmon-mediated photocatalytic activities. In this work, the CdS/Au-Ag/B-TiO2 photocatalyst, combining a heterojunction structure with localized surface plasmon resonance (LSPR), is prepared by a high-temperature hydrogen reduction and hot solvent method. The novel synergistic interaction at the interface between the electric field and the plasmon electromagnetic field drives effective charge separation with improved photocatalytic efficiency. The Cd3Ti2 catalyst exhibits the highest photocatalytic activity, and the H2 generation efficiency under the full solar spectrum is 15.97 mmol⋅h−1⋅g−1 with good stability as high as 81.3% in 24 h cycles. The CH4 and CO precipitation performances are achieved at 14.2 μmol⋅h−1⋅g−1 and 113.9 μmol⋅h−1⋅g−1, respectively, in the CO2RR process. The design of the synergistic mechanism of the dual electric field offers an important development in the field of plasma-mediated photoredox catalysis. [Display omitted] •Biphasic TiO2 containing Ovs is prepared by high-temperature hydrogen reduction method.•Z-type & type-II composite heterostructures promote electron transfer and enhance photoelectron concentration.•The interface electric field and the plasmon electromagnetic field drives charge separation with improved photocatalytic efficiency.•Excellent performance: the H2 generation efficiency of 15.97 mmol⋅h−1⋅g−1 maintained 81.3% after 24 h.•The CH4 and CO precipitation performances are achieved at 14.2 μmol⋅h−1⋅g−1 and 113.9 μmol⋅h−1⋅g−1, respectively, in the CO2RR process.