介孔材料
光催化
材料科学
无定形固体
结晶
辐照
化学工程
紫外线
氧化物
紫外线
相(物质)
分解水
光化学
催化作用
结晶学
化学
光电子学
有机化学
物理
核物理学
工程类
冶金
作者
Yu Noda,Byongjin Lee,Kazunari Domen,Junko N. Kondo
摘要
The well-ordered two-dimensional hexagonal (2D-hex) structure of mesoporous Ta2O5 was maintained after crystallization with the aid of SiO2 reinforcement, which was removed after crystallization. The photocatalytic activity of the mesoporous Ta2O5 for overall water splitting under ultraviolet (UV) irradiation was improved by changing the solid phase structure from amorphous to crystalline by nearly 1 order of magnitude. The resulting photocatalytic activity of NiOx(3.0 wt %)-loaded crystalline mesoporous Ta2O5 for water decomposition (3360 μmol·h−1 of H2 and 1630 μmol·h−1 of O2 evolution at the initial 1 h) was found to show one of the highest activities among so far reported photocatalysts under similar conditions. The high activity is attributable to the efficient transfer of the excited electrons and holes from inside to the surface of the catalyst through thin-walled crystalline phase.
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