A novel all-solid-state S-scheme in CdS/ZnTHPP binary nanosystem for hydrogen evolution. (26th March 2022)

• Record Type: Journal Article
• Authors: Ni, Nan; Qie, Boyu; Du, Sicen; Sang, Zhe; Wang, Qiushi; Meng, Changgong; Tong, Yexiang
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 26(2022)
• Page Start: 13044
• Page End: 13053
• Publication Date: 2022-03-26
• Subjects: CdS -- Binary nanosystem -- Step-scheme -- Hydrogen generation -- Energy conversion; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.02.067
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The development of a highly active and stable hydrogen evolution photocatalyst is a key issue for achieving efficient and comprehensive water splitting, and it is still challenging for the scientific community and practical applications. Herein, we build up a novel visible-light-driven S-scheme in CdS/ZnTHPP binary nanosystem by simple sintering process ensuring the fast transfer of the photo-generated carriers, showing dark green upon simulated sunlight irradiation. Under an optimal condition, the highest hydrogen evolution turnover number (TON) reaches around 22, 264 during 128 h irradiation, and the H2 evolution rates of the best CdS/ZnTHPP binary nanosystem was boosted up to a 400 mmol/g under irradiation for 8 hours with a conversion rate over 10-fold-higher than that of pristine CdS NRs. The macrocyclic compound serves as a region of electron absorption assisting the fast and continuous consumption of photo-generated electrons in this system, thereby concurrently alleviating the recombination of electron-hole pairs. Theoretical analyses reveal that the active sites and the generation of H2 are controlled by the thermodynamic process. This new finding provides a new approach to rationally designing an efficient solar-to-chemical conversion system. Graphical abstract: A novel visible-light-driven Z-scheme in CdS/ZnTHPP binary nanosystem was built up by a simple sintering process ensuring the fast transfer of the photo-generated carriers, showing a robust hydrogen evolution performance. Image 1 Highlights: A novel visible-light-driven Z-scheme in CdS/ZnTHPP binary nanosystem was built. The best H2 evolution rate of CdS/ZnTHPP was 400 mmol/g under irradiation for 8 hours. Theoretical analyses reveal the active sites and the generation of H2 are controlled by the thermodynamic process.