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Band Structure Engineering of Single Pt Atoms on Fe−TiO2 for Enhanced Photocatalytic Performance

Von Wiley-VCH zur Verfügung gestellt

Fe3+ doping was utilized to promote the formation of oxygen vacancies and improve the interaction between TiO2 and atomic Pt. Single Pt atoms anchored on the oxygen vacancy sites of Fe−TiO2 effectively modify the local energy band structure of TiO2, and thus significantly boost the catalytic performance of either the intrinsic or the sensitized photocatalytic process for Pt/Fe−TiO2.


Abstract

Single atomic site catalysts display the maximal atom-utilization efficiency, unique structural properties, and remarkable enhancements on catalytic activity. Herein, single Pt atoms loaded Fe−TiO2 catalysts were prepared. Fe3+ doping leads to the formation of oxygen vacancies and improve the interaction between TiO2 and Pt. Single Pt atoms are thus anchored and effectively modify the local energy band structure of TiO2. The optimized local band structures improve the intrinsic photoexcitation of Pt/Fe−TiO2, promote the separation of photogenerated carriers, and extend the lifetime of photogenerated carriers. Meanwhile, the electrons transfer from the excited dyes to the conduction band edge of Pt/Fe−TiO2 is also facilitated due to the shift-down of the conduction band edge. Therefore, with the increase of the Pt content (till up to 0.6 wt%), the photocatalytic performance of Pt/ Fe−TiO2 with the confined single Pt atoms is significantly boosted in either the intrinsic or the sensitized photocatalytic process.

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