Characterisation of a water-oxidizing Co-film by XAFS

被引：22

作者：

Risch, Marcel ^{[1
]}

Ringleb, Franziska ^{[1
]}

Khare, Varsha ^{[1
]}

Chernev, Petko ^{[1
]}

Zaharieva, Ivelina ^{[1
]}

Dau, Holger ^{[1
]}

机构：

[1] Free Univ Berlin, FB Phys, D-14195 Berlin, Germany

来源：

14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS | 2009年 / 190卷

关键词：

RAY-ABSORPTION SPECTROSCOPY; OXYGEN-EVOLVING CATALYST; MANGANESE COMPLEX; PHOTOSYSTEM-II; OXIDATION; PHOSPHATE;

D O I：

10.1088/1742-6596/190/1/012167

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A major enterprise for scientists worldwide is the search for alternative fuels and molecular hydrogen (H-2) is a promising candidate. Its large-scale technical production needs to involve water-oxidation catalysts from inexpensive and abundant materials. Here, a water-oxidizing Co-based catalyst film (CoCF) is investigated. We review and extend our previous X-ray absorption spectroscopy (XAS) measurements (at Helmholtz-Zentrum Berlin/BESSY) by comparison to LiCoO2, a Co-III compound of similar structure and composition. Further evidence is presented that the bulk oxidation state of cobalt in the CoCF is 3+. We propose that the catalyst film is composed of interconnected complete and/or incomplete Co-oxo cubanes possibly forming a disordered network of the basic Co-3/4(mu-O)(4) units.

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页数：4

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