光催化
材料科学
纳米颗粒
纳米结构
纳米技术
载流子
介孔材料
光化学
量子点
制氢
化学工程
催化作用
光电子学
化学
生物化学
工程类
作者
Zichao Lian,Masanori Sakamoto,Yoichi Kobayashi,Naoto Tamai,Jun Ma,Tsuneaki Sakurai,Shu Seki,Tatsuo Nakagawa,Ming-Wei Lai,Mitsutaka Haruta,Hiroki Kurata,Toshiharu Teranishi
标识
DOI:10.1021/acs.jpclett.8b00789
摘要
In artificial photosynthesis, the establishment of design guidelines for nanostructures to maximize the photocatalytic performance remains a great challenge. In contrast with the intense research into band-offset tuning for photocatalysts, the relationship between nanostructures and photoinduced carrier dynamics has still been insufficiently explored. We synthesized durian-shaped CdS@ZnSe core@mesporous-shell nanoparticles ( d-CdS/ZnSe NPs) and investigated the carrier dynamics in photocatalytic hydrogen evolution. The cocatalyst-free d-CdS/ZnSe NPs exhibited high photocatalytic activity for H2 evolution (14.8% apparent quantum yield at 420 nm) and excellent stability (maintaining 80% activity after 72 h) under visible-light irradiation (>422 nm). The transient absorption measurement and flash photolysis time-resolved microwave conductivity unveiled that the ultra-long-lived charge separation (>6.2 ms) and swift hole transfer to the surfaces of ZnSe shell (11 ns) contribute the high catalytic activity and stability. The present work provides a novel insight into designing nanoparticulate photocatalysts with optimized performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI