Molybdenum-titanium oxo-cluster, an efficient electrochemical catalyst for the facile preparation of black titanium dioxide film

Dalton Transactions : an International Journal of Inorganic Chemistry
Lei YangJie Dai

Abstract

Black-TiO2 has become increasingly interesting as a promising photoactive material. Most of the preparations for black-TiO2 involve either high temperature calcination, plasma, lengthy chemical reactions or dealing with dangerous or toxic chemicals. We found, by accident, that Mo-Ti oxo-clusters are efficient catalysts for the hydrogenation of a TiO2 electrode to black-TiO2 at room temperature. A series of Mo-Ti oxo-clusters, [Ti4Mo4O10(OR)14(X-BA)2] (BA = benzoate, X = H (1), F (2), Cl (3), and Br (4)), were prepared and were characterized by crystallography. They have a Mo4Ti4 structure with Mo(v)-Mo(v) metal-metal interactions. The activated hydrogen (H*) generated by electrochemically catalytic water splitting turns the TiO2 electrode to black-TiO2 at room temperature, due to the reduction of Ti(iv) to H+Ti(iii). The potentials applied for water reduction must generally be higher than the overpotential at the TiO2 electrode (-1.0 V vs. RHE). In this work, the onset potential of hydrogen evolution significantly decreased to -0.1 V vs. RHE. Using this blackened 1-TiO2 electrode, the effective electrochemical catalytic degradation of a dye was examined in comparison with the degradation using the white TiO2 electrode. This wor...Continue Reading

References

May 25, 2011·Inorganic Chemistry·Salvador EslavaDominic S Wright
Nov 19, 2011·Dalton Transactions : an International Journal of Inorganic Chemistry·Laura CoyleR John Errington
Apr 24, 2012·Journal of the American Chemical Society·Alberto NaldoniVladimiro Dal Santo
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Sep 29, 2019·Chemical Communications : Chem Comm·Pei-Yi LiuJie Dai
Dec 24, 2019·Journal of the American Chemical Society·Qian SongTie Wang

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