4.6 Article

Two-step synthesis of Sillen-Aurivillius type oxychlorides to enhance their photocatalytic activity for visible-light-induced water splitting

期刊

JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 23, 页码 10909-10917

出版社

ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta03321h

关键词

-

资金

  1. CREST [JPMJCR1421]
  2. JSPS KAKENHI [JP17H06439, JP16H06439, JP16H06441, JP15H03849]
  3. Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (A) Advanced Research Networks

向作者/读者索取更多资源

A two-step synthesis via the polymerized complex method (2PC) was developed to improve the photocatalytic activity of a Sillen-Aurivillius oxychloride Bi4TaO8Cl and related oxychlorides for O-2 evolution (i.e., water oxidation) in Z-scheme water splitting under visible light. This method uses the polymerized complex reaction to prepare a precursor oxide (e.g., Bi3TaO7), which is subsequently calcined with BiOCl to yield a pure Bi4TaO8Cl phase with smaller particle sizes than those obtained via a conventional single-step solid-state reaction (1SSR). Furthermore, time-resolved microwave conductivity (TRMC) measurements revealed that the Bi4TaO8Cl sample prepared by the 2PC method at 973 K (2PC_973) achieved more than five times longer-lived charge separation than that by the 1SSR at 973 K (1SSR_973), which probably arises from lower numbers of charge-recombination centers produced in the 2PC synthesis. Thus, the synthesized Bi4TaO8Cl samples exhibited a higher rate of O-2 evolution (e.g., 20 mu mol h(-1) for 2PC_973 vs. 4 mu mol h(-1) for 1SSR_973). Overall water splitting into stoichiometric H-2 and O-2 was demonstrated by constructing a Z-scheme photocatalytic system consisting of 2PC_973, Ru-modified SrTiO3:Rh, and an Fe3+/Fe2+ shuttle redox mediator, with an external quantum efficiency of 0.9% at 420 nm, which was much higher than that using the sample derived from the optimized 1SSR method at 1173 K (0.4%). The 2PC synthesis was successfully extended to other Sillen-Aurivillius type oxychlorides, Bi4NbO8Cl, Bi6NbWO14Cl and Sr2Bi3Ta2O11Cl, all of which exhibited superior water splitting activity compared to those prepared through the 1SSR.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据