Preparation of ZnIn_2S_4/fluoropolymer fiber composites and its photocatalytic H_2 evolution from splitting of water using Xe lamp irradiation

摘要

This paper focuses on the preparation of ZnIn_2S_4/fluoropolymer fiber composites and their performance for H_2 evolution from splitting of water using Xe lamp irradiation. Hexa-fluorobutyl acrylate-co-methacrylic acid (poly(HFBA-co-MAA)) is synthesized by a solution polymerization. Next, the fluoropolymer fibers, which have around 100 nm in average diameter, of poly(HFBA-co-MAA) and polyvinylidene fluoride (PVDF) mixtures are obtained by electrospinning. Then, zinc and indium ions are introduced onto the fiber surface by coordinating with carboxyls of MAA. After that, sulfide ions are incorporated to react with zinc and indium ions by a hydrothermal synthesis. Thus, ZnIn_2S_4 particles of around 800 nm in average size, are obtained and well loaded on the fiber surface. The absorption edge of ZnIn_2S_4/fluoropolymer fiber composites is at 510 nm within the visible-light region. Photocatalytic H_2 evolution from water was investigated using Xe lamp. It was found that the average rate of H_2 evolution of ZnIn_2S_4 powders gradually decreased, while the average rate of H_2 evolution of ZnIn_2S_4/fluoropolymer fiber composites increased from the first to the third run. The average rate of H_2 evolution using the ZnIn_2S_4/fluoropolymer fiber composites as the catalyst achieved 9.1 mL/h in the third run.