倍半氧化物
金红石
材料科学
带隙
锐钛矿
价(化学)
二氧化钛
钛
退火(玻璃)
化学工程
化学物理
氧化物
纳米技术
光电子学
催化作用
化学
冶金
光催化
有机化学
工程类
生物化学
作者
Yangyang Li,Yang Yang,Xinyu Shu,Dongyang Wan,Nini Wei,Xiaojiang Yu,Mark B. H. Breese,T. Venkatesan,Jun Xue,Yichen Liu,Sean Li,Tom Wu,Jingsheng Chen
标识
DOI:10.1021/acs.chemmater.8b01739
摘要
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.
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