From Titanium Sesquioxide to Titanium Dioxide: Oxidation-Induced Structural, Phase and Property Evolution

Yangyang Li, Yang Yang, Xinyu Shu, Dongyang Wan, Nini Wei, Xiaojiang Yu, Mark B. H. Breese, Thirumalai Venkatesan, Jun Min Xue, Yichen Liu, Sean Li, Tom Wu, Jingsheng Chen

    Research output: Contribution to journalArticlepeer-review

    14 Scopus citations

    Abstract

    In contrast to Ti4+-containing titanium dioxide (TiO2), which has a wide bandgap (∼3.0 eV) and has been widely explored for catalysis and energy applications, titanium sesquioxide (Ti2O3) with an intermediate valence state (Ti3+) possesses an ultranarrow bandgap (∼0.1 eV) and has been much less investigated. Although the importance of Ti3+ to the applications of TiO2 is widely recognized, the connection between TiO2 and Ti2O3 and the transformation pathway remain unknown. Herein, we investigate the oxidation-induced structural, phase, and property evolution of Ti2O3 using a complementary suite of microscopic and spectroscopic tools. Interestingly, transformation pathways to both rutile and anatase TiO2 are identified, which sensitively depend on oxidation conditions. Unique Ti2O3/TiO2 core–shell structures with annealing-controlled surface nanostructure formation are observed for the first time. The compositional and structural evolution of Ti2O3/TiO2 particles is accompanied by continuously tuned optical and electrical properties. Overall, our work reveals the connection between narrow-bandgap Ti3+-containing Ti2O3 and wide-bandgap Ti4+-containing TiO2, providing a versatile platform for exploring photoelectrocatalytic applications in valence- and structure-tailored oxide materials.
    Original languageEnglish (US)
    Pages (from-to)4383-4392
    Number of pages10
    JournalChemistry of Materials
    Volume30
    Issue number13
    DOIs
    StatePublished - Jun 15 2018

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