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  • Title: Defective titanium dioxide single crystals exposed by high-energy {001} facets for efficient oxygen reduction.
    Author: Pei DN, Gong L, Zhang AY, Zhang X, Chen JJ, Mu Y, Yu HQ.
    Journal: Nat Commun; 2015 Oct 23; 6():8696. PubMed ID: 26493365.
    Abstract:
    The cathodic material plays an essential role in oxygen reduction reaction for energy conversion and storage systems. Titanium dioxide, as a semiconductor material, is usually not recognized as an efficient oxygen reduction electrocatalyst owning to its low conductivity and poor reactivity. Here we demonstrate that nano-structured titanium dioxide, self-doped by oxygen vacancies and selectively exposed with the high-energy {001} facets, exhibits a surprisingly competitive oxygen reduction activity, excellent durability and superior tolerance to methanol. Combining the electrochemical tests with density-functional calculations, we elucidate the defect-centred oxygen reduction reaction mechanism for the superiority of the reductive {001}-TiO2-x nanocrystals. Our findings may provide an opportunity to develop a simple, efficient, cost-effective and promising catalyst for oxygen reduction reaction in energy conversion and storage technologies.
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