3 years ago

Amorphous Cobalt Oxide Nanoparticles as Active Water-Oxidation Catalysts

Amorphous Cobalt Oxide Nanoparticles as Active Water-Oxidation Catalysts
Michel Dupuis, Xiaoyan Liu, Fuxiang Zhang, Lin Gu, Can Li, Zheng Chen, Zhiyao Duan, Zhiliang Wang
Artificial photosynthesis requires the practical use of efficient, robust, and economical water-oxidation catalysts (WOCs) for chemical-fuel production. The synthesis of amorphous cobalt oxide nanoparticles (ca. 2 nm) is reported as a WOC with a turnover frequency up to 8.6 s−1 in the photocatalytic Ru(bpy)32+–Na2S2O8 system (bpy=2,2′-bipyridyl). This activity is unprecedented in heterogeneous cobalt-based WOCs and is even comparable to that of a state-of-the-art homogeneous cobalt-based polyoxometalate catalyst. With the help of experimental and computational X-ray absorption spectroscopy, the atomic structure of the synthesized amorphous cobalt oxide nanoparticles was characterized, and it consists of a one-dimensional chain of dimeric edge-sharing CoO6 octahedra. Theoretical calculations suggest that this structure was able to promote O−O bond coupling, unlike crystalline cobalt oxide WOCs, which led to the enhanced water-oxidation activity. WOC of life: Amorphous cobalt oxide nanoparticles (2 nm) composed of one-dimensional chains of dimeric edge-sharing octahedra are extremely active towards water oxidation with a turnover frequency (TOF) value reaching 8.6 s−1 in the photocatalytic Ru(bpy)32+–Na2S2O8 (bpy=2,2′-bipyridyl) system.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700882

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