材料科学
分解水
光催化
介孔材料
量子效率
光催化分解水
晶界
半导体
带隙
结晶度
纳米技术
化学工程
光化学
催化作用
光电子学
化学
微观结构
生物化学
工程类
冶金
复合材料
作者
Ran Wang,Hanna He,Li Shi,Dayue Du,Guoan Lin,Chuhong Zhang,Xiaoxiang Xu
标识
DOI:10.1002/aenm.202302996
摘要
Abstract LaTiO 2 N is a promising narrow‐bandgap semiconductor photocatalyst that shows great promise for water redox reactions. However, its performance is often hindered by fast photocarrier recombination events. Herein, LaTiO 2 N mesoporous single crystals (MSCs) are successfully fabricated via a topotactic conversion route by using the Ruddlesden–Popper compound NaLaTiO 4 as the precursor. The LaTiO 2 N MSCs are characterized by high crystallinity, abundant mesopores, no grain boundaries (GBs), and exposure of (010) and (101) crystal facets. A facet‐assisted photocarrier separation mechanism is identified for these LaTiO 2 N MSCs which contributes to the much better photocarrier separation than conventional counterparts. By loading proper cocatalysts, LaTiO 2 N MSCs serve as an efficient photocatalyst for water‐splitting half‐reactions and are capable of photocatalyzing overall water‐splitting reactions, delivering an impressive apparent quantum efficiency (AQE) as high as 65.07% at 420 ± 20 nm for O 2 ‐evolution and a solar‐to‐hydrogen (STH) efficiency as high as 0.012% for solar‐driven overall water splitting. These findings not only highlight the grain‐boundary‐free MSCs with peculiar crystal‐facet exposure as highly active photocatalysts for particulate photocatalysis but also provide a rational design approach for developing efficient photocatalysts.
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