• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Visible photoelectrochemical water splitting into H-2 and O-2 in a dye-sensitized photoelectrosynthesis cell
【24h】

Visible photoelectrochemical water splitting into H-2 and O-2 in a dye-sensitized photoelectrosynthesis cell

机译：Visible photoelectrochemical water splitting into H-2 and O-2 in a dye-sensitized photoelectrosynthesis cell

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

A hybrid strategy for solar water splitting is exploited here based on a dye-sensitized photoelectrosynthesis cell (DSPEC) with a mesoporous SnO2/TiO2 core/shell nanostructured electrode derivatized with a surface-bound Ru(II) polypyridyl-based chromophore-catalyst assembly. The assembly, (4,4'-(PO3H2)(2)bpy)(2)Ru(4-Mebpy-4'-bimpy) Ru (tpy)(OH2)(4+) (Rua II-Rub II-OH2(4+), combines both a light absorber and a water oxidation catalyst in a single molecule. It was attached to the TiO2 shell by phosphonate-surface oxide binding. The oxide-bound assembly was further stabilized on the surface by atomic layer deposition (ALD) of either Al2O3 or TiO2 overlayers. Illumination of the resulting fluorine-doped tin oxide (FTO) jSnO(2)/TiO(2)j-Rua II-Rub II-OH2(4+) (Al2O3 or TiO2) photoanodes in photoelectrochemical cells with a Pt cathode and a small applied bias resulted in visible-light water splitting as shown by direct measurements of both evolved H-2 and O-2. The performance of the resulting DSPECs varies with shell thickness and the nature and extent of the oxide overlayer. Use of the SnO2/TiO2 core/shell compared with nanoITO/TiO2 with the same assembly results in photocurrent enhancements of similar to 5. Systematic variations in shell thickness and ALD overlayer lead to photocurrent densities as high as 1.97 mA/cm(2) with 445-nm, similar to 90-mW/cm(2) illumination in a phosphate buffer at pH 7.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号