Kageshima Yosuke, Tateyama Shutaro, Kishimoto Fuminao, Teshima Katsuya, Domen Kazunari, Nishikiori Hiromasa
Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan.
Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Phys Chem Chem Phys. 2021 Mar 11;23(9):5673-5679. doi: 10.1039/d0cp06139e.
A visible light responsive photocatalyst, Mo-doped BiVO4 (Mo:BVO), was shown to promote oxygen evolution from water in response to photon upconverted emission based on triplet-triplet annihilation (TTA) in the same aqueous dispersion. Composites comprising a triplet sensitizer (Pt(ii) octaethylporphyrin; PtOEP) and a singlet emitter (9,10-diphenylanthracene; DPA) intercalated in a layered clay compound (montmorillonite or saponite) were prepared using a facile but versatile solvothermal method. These composites were capable of converting green incident light (λ = 535 nm) to blue light (λ = 430 nm) even in air. The host layered clay as well as the co-intercalated surfactant evidently functioned as barriers against water and oxygen to prevent the quenching of the active compounds. The TTA upconversion driven photocatalytic oxygen evolution using the aqueous mixture of the dyes-clay composite and particulate photocatalysts can be a potential approach to eliminate the undesired optical losses and thus be a breakthrough for future industrial and large-scale installation in an inexpensive manner.
一种可见光响应型光催化剂，钼掺杂的钒酸铋（Mo:BVO），已被证明在同一水分散体系中，基于三重态-三重态湮灭（TTA）对光子上转换发射作出响应，从而促进从水中析氧。采用简便但通用的溶剂热法制备了包含三重态敏化剂（铂（II）八乙基卟啉；PtOEP）和单重态发射体（9,10-二苯基蒽；DPA）插层在层状粘土化合物（蒙脱石或皂石）中的复合材料。这些复合材料即使在空气中也能够将绿色入射光（λ = 535 nm）转换为蓝光（λ = 430 nm）。主体层状粘土以及共插层的表面活性剂显然起到了防水和防氧屏障的作用，以防止活性化合物的猝灭。使用染料-粘土复合材料和颗粒光催化剂的水性混合物通过TTA上转换驱动的光催化析氧可能是一种消除不期望的光学损失的潜在方法，从而以低成本方式成为未来工业和大规模装置的一个突破。
