Marcel Risch et al 2009 J. Phys.: Conf. Ser. 190 012167 doi:10.1088/1742-6596/190/1/012167
Marcel Risch, Franziska Ringleb, Varsha Khare, Petko Chernev, Ivelina Zaharieva and Holger Dau
Show affiliationsA major enterprise for scientists worldwide is the search for alternative fuels and molecular hydrogen (H2) 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 CoIII 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 Co3/4(μ-O)4 units.
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
78.70.Dm X-ray absorption spectra
84.60.-h Direct energy conversion and storage
82.30.-b Specific chemical reactions; reaction mechanisms
82.80.Ej X-ray, Mössbauer, and other gamma-ray spectroscopic analysis methods
Condensed matter: electrical, magnetic and optical
Issue 1 (2009)
Marcel Risch et al 2009 J. Phys.: Conf. Ser. 190 012167
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